Search

Introduction. In a competitive environment, the image of a modern region is an instrument of “soft power”, capable of enhancing the effectiveness of the territory's development, provided it is associated with positive impressions. In this regard, analyzing perception of the symbolic component of a region's image by various target groups is of particular importance. The purpose of the study is to reveal the symbols, impressions, stereotypes most prevailing among the respondents that form the image of the Republic of Mordovia, which are the factors in developing the regional identity. Materials and Methods. The Republic of Mordovia was chosen for a case study: the region’s development is a vivid example of contradictoriness, the Republic being a leader in some indicators (it is among the safest regions of the country, it actively develops the innovative infrastructure, etc.) is a complete outsider in others (in the quality of life and average wages compared to other regions, etc.). Symbolic interactionism, emphasizing communication through symbols the meaning of which is set by the communicants, established the theoretical framework of the study. The method of focused interview provided the applied basis of the research. Discussions were held in 3 groups, formed according to the place of residence of the respondents: “foreigners”, “non-residents”, “residents”. Results. Unique data on the specific features of the perception of the image of the Republic of Mordovia, promoted by various agencies involved in image-making, have been obtained. The dependence of assessments and emotional attitudes to various symbols on the territorial affiliation of the recipients has been revealed. It has been noted that associations between a number of symbols (fox, octagonal rosette, red color, etc.) and Mordovia are unclear to non-residents, i. e., the mechanism of explanation, fixation and consolidation in the row of “region – symbol” is broken. Discussion and Conclusion. The authors have come to the conclusion that at present there are no images presenting unambiguously positive stable associations with the Republic of Mordovia, especially among “non-residents” and “foreigners”. The gap between the primary and secondary images is a rather worrying trend is, which can lead to dissonance, negative emotional response and negative assessments of the territory. The results of the study may be used to adjust the image-making policy of a region: to emphasize strengths and level weaknesses.

This research starts with the analysis of conspicuous consumption as a specific means to emphasize one’s social status. As far back as the end of the 19th century Thorstein Veblen developed a theory about a specific class who was characterized by nonproductive activities and specific surrounding - servants, clothing, which is not suitable for work, luxurious furniture. Since that idea was examined many times in various researches during the last century, it appears to be interesting to compare it with the concept of taste, which one cannot help appealing to while choosing anything, especially something that shows one’s status. The article draws attention to the peculiarities of taste development and its role in choosing possessions according to class preferences. In addition, it emphasizes the importance of the correspondence between possessions and their owner’s status as it guarantees to create a true impression about their social status. That idea has been marked out due to Jean Baudrillard’s researches which defined the dependence of home furniture upon income and belonging to a certain class. The question arises as to what role ‘pure’ taste plays in taste of a whole class. The taste typology by Pierre Bourdieu (the tastes of luxury and the tastes of necessity) enables to analyze the social aspect of taste, in particular the way the taste of a certain social group develops under pressure of existing social preferences and stereotypes as well as the way it impacts on the choice of purchases. The author concludes that a need may be considered a basis for both kinds of tastes. Whereas in the first case a need is an obvious component of taste development, in the second one it is more difficult to prove that a need to leave an impression on someone is as severe as a need to live.

Virtual reality (VR) through a head-mounted display (HMD) can provide new experiences. However, it remains unclear how the characteristics of HMDs affect users’ memory. To use HMDs more effectively and appropriately in several applied fields, including education, it is necessary to clarify what characteristics of HMDs affect users’ memory. A head-tracking function mounted on an HMD helps to detect the user’s head direction to enable a simulation experience akin to the real world. When we experience a simulation on an HMD, we actively perceive the visual world. In this study, we assessed how active/passive viewing affects users’ memory of VR content. We conducted a psychological experiment in which participants watched a movie on an HMD. In the active viewing condition, the presented view changed depending on the participant’s head direction. In the passive viewing condition, the presented view was a recorded movie that was shown to the participants in the active viewing condition. All participants took a memory test about the content presented in the movie on the day of viewing and 2 weeks later. The results showed that performance on the memory test in the active viewing condition was significantly lower than that in the passive viewing condition after 2 weeks. This result indicated that active viewing in VR inhibited users’ memory compared to passive viewing. The current study contributes to the development of new VR techniques, such as educational learning.

Objective To evaluate and compare the stability of the open tray impression coping within the set impression while attaching the lab analog when polyether (PE) heavy body and polyvinyl siloxane (PVS) putty impression materials were used and the implant platform was placed sub-gingivally at three different depths. Methods Two impression materials, PE and PVS, and custom-made plexiglass models with embedded single implants to simulate implant positioning depths of 0 mm, 2 mm, and 4 mm, sub-gingivally, were used in the study. Open tray impressions were made after attaching impression coping to the implant embedded in the model. Implant lab analog was attached to the impression coping in the set impression, and its stability was measured using a universal testing machine. Forty-two open tray impressions were made in six groups, with seven impressions in each group. Descriptive statistics such as mean and standard deviation were calculated. A comparison of the mean stability between the two impression materials at each depth was done using an independent t-test. Comparison of the mean stability between the three different subgingival implant depths in each material was done by one-way ANOVA with the Scheffe multiple comparison test (post-hoc analysis). The level of significance was set at p<0.05. Results The stability of the impression coping was measured as the force in Newtons required for the displacement of the analog attached to the impression coping embedded in the set impression. PE with the embedded impression coping at a depth of 0 mm gave the highest mean stability value (4.37+/-0.41), and the least mean stability was offered by PVS with the embedded impression coping at 4 mm depth (1.88+/-0.37). When an independent t-test was done to compare the mean stability values of PE and PVS, there was a statistically significant difference at 0 mm, 2 mm, and 4 mm. On doing one-way ANOVA to compare the mean stability between the different depth groups, there was a statistically significant difference between the three depth groups in PE and PVS. Scheffe multiple comparison tests (post-hoc analysis) revealed a statistically significant difference between 0 mm, 2 mm, and 4 mm subgingival depths of the impression coping placement in both PE and PVS. Conclusion The accuracy of the master cast is an important determinant for the precise fit and long life of the final prosthesis. In the case of maxillary anterior implant placements where deep subgingival placement of the implant platform is needed for aesthetic and functional reasons, the impression material should be selected carefully to ensure the stability of the impression coping. Among the materials included in the present study, the PE impression material offered the maximum stability for impression coping compared to PVS., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2024, P.M et al.)

In the case of old mobile denture wearers, one of the main problems is related to the dentures’ retention and insufficient stability. Our goal was to improve support and stability using a different type of final impression, with different types of impression materials. In this study we chose a number of three complete edentulous patients who presented for complete oral rehabilitation. They were wearing full acrylic dentures with poor support and stability. Complete examination revealed the presence of the flabby ridge. The impression methods for the prosthetic fields with a flabby ridge differ from the classical method by using techniques that involve the use of at least two impression materials with fluid consistency to record all the details of the prosthetic fields in the final impression, this being done in two steps; the impression of the flabby ridge areas must be done without pressure, in its resting position. The impression methods we applied led to the expected results, and the dentures succeeded in offering the patient the desired functional comfort. Using fluid impression material for the flabby ridge in a resting position, and a fenestrated custom tray, offered a good quality in adaptation, maintenance and stability of the final dentures.

Background: Medication is an important approach of treatment for patients with schizophrenia; however, the availability of visiting nurses and other human-related support is limited. This study aims to build a system in which service robots support the treatment of individuals with schizophrenia with medication at home. Moreover, medical staff can seamlessly monitor the status of their patients through the robots using this system. In this study, to develop a support system, interactions between a communication robot and patients were surveyed, with a focus on the patients' impression of the robot and actual utterance times. Methods: Communication between a commercially available communication robot and schizophrenic patients was investigated, particularly the participants' feelings about the robot. In addition, the utterance data between the participants and the robot were extracted and the durations of the conversations were assessed. Results: The examined interaction mode of a robot (talkative or not talkative) and whether the participant spoke or not (spoke or did not speak) revealed no significant association in all adjectives. A co-occurrence network graph showed differences in the participants' impressions of the robot depending on how talkative the robot was. That is, when the robot did not initiate conversation often, the patient was more likely to initiate interactions and use longer phrases than when the robot initiated conversation frequently. Conversations also lasted longer when the participant, not the robot, initiated conversation. Conclusions: People with schizophrenia converse with a robot regardless of whether the robot is talkative or not. Since the content of the conversation was not analyzed qualitatively, it is necessary to carefully examine whether people with schizophrenia can develop partnerships with robots. [ABSTRACT FROM AUTHOR]

Aim. The aim of this article is to deal with visual dignity in the field of western art throughout the ages as it seeks to present the artistic and design devices employed by artists in order to compose and convey this aura of dignity. Moreover, it addresses the ways in which they create various kinds of atmosphere of respect and dignity felt by the observer regarding the topic and object of the painting or sculpture. Methods. In order to achieve this aim, the article examines seven masterpieces which explore the visual representations of various perceptions of dignity and their implications. Among the elements affecting the creation of dignity in the visual domain one finds: an impressive or majestic appearance, noblesse, self-esteem, pride, self-confidence, inner strength, authoritativeness and charisma. At times, the respectful treatment of the figures is clear as soon as one views the work, but at others it is implied in the interpretation given to it. It is not this article's intention to discuss the different perceptions or expressions of human dignity, historically, theologically, politically, psychologically, nationally or socially, but to present them artistically as they are the innate right of people to be appreciated, treated with courtesy and met with ethical behavior. Results and conclusion. The research done in order to reach a conclusion confirming or contradicting the premises at its base, resulted in a mosaic of situations in which human dignity is reflected. The range of possibilities at the artists' disposal for creating this value is diverse and includes: composition, use of color, mimesis, embellishment, disfigurement or distortion of reality. The pieces examined present: a military commander at the moment of his foe's surrender; an author monumentally impressive, man of vision and power and of grand dimensions, rising up from a stone plinth; a stern-faced, disfigured dwarf considered a 'curiosity', seated on the ground; a family of farmers living an impoverished and meager life; and a Jesus-like mysterious intellectual and Moses the prophet. All these together at first glance appear to be a strange collection of works, in which the common denominator is unclear or seemingly absent. However, this diverse group is included in the article because of the aura of dignity the figures command or convey. At times, the respectful treatment of the figures is clear as soon as one views the work, but at others it is implied in the interpretation given to it. [ABSTRACT FROM AUTHOR]

Purpose: This study aimed to compare two methods for final impression during the fabrication of complete dentures: a traditional method using custom trays (T-group) and a simplified method using the trial denture baseplate (S-group).Methods: A pragmatic clinical trial was conducted among edentulous individuals referred for conventional denture treatment. A consecutive sample of edentulous patients was assigned to two groups by cluster randomisation according to the final impression strategy, 30 in the T-group and 38 in the S-group. In the T-group, an auto-polymerising acrylic resin custom tray was used for impression; in the S-group, the final impression was performed using the try-in dentures. For both groups, zinc oxide eugenol paste was used as the impression material. The quality of the dentures was assessed using two rating scales (Functional Assessment of the Dentures and Kapur method). Moreover, clinical time for denture fabrication, number of post-insertion appointments for adjustments, patient satisfaction and post-treatment oral health-related quality of life impacts were also assessed.Results: There were no significant differences between groups regarding prosthodontic and patient-reported outcomes. The S-group demanded less clinical time (P = 0.002), with a 23.3% mean reduction in clinical time (P = 0.002) and lower number of appointments until the delivery of the dentures (S-group = 4.18 vs T-group = 5.0; P = 0.001).Conclusions: This study showed that the alternative method for final impression is less time-consuming and has similar clinical outcomes when compared to the traditional final impression method. Findings suggest that this alternative may be considered when efficiency is a critical issue in healthcare services. [ABSTRACT FROM AUTHOR]

Copyright of Journal of the Japan Research Association for Textile End-Uses / Sen'i Seihin Shohi Kagaku is the property of Japan Research Association for Textile End-Uses / Sen'i Seihin Shohi Kagaku and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Virtual reality (VR) through a head-mounted display (HMD) can provide new experiences. However, it remains unclear how the characteristics of HMDs affect users' memory. To use HMDs more effectively and appropriately in several applied fields, including education, it is necessary to clarify what characteristics of HMDs affect users' memory. A head-tracking function mounted on an HMD helps to detect the user's head direction to enable a simulation experience akin to the real world. When we experience a simulation on an HMD, we actively perceive the visual world. In this study, we assessed how active/passive viewing affects users' memory of VR content. We conducted a psychological experiment in which participants watched a movie on an HMD. In the active viewing condition, the presented view changed depending on the participant's head direction. In the passive viewing condition, the presented view was a recorded movie that was shown to the participants in the active viewing condition. All participants took a memory test about the content presented in the movie on the day of viewing and 2 weeks later. The results showed that performance on the memory test in the active viewing condition was significantly lower than that in the passive viewing condition after 2 weeks. This result indicated that active viewing in VR inhibited users' memory compared to passive viewing. The current study contributes to the development of new VR techniques, such as educational learning. [ABSTRACT FROM AUTHOR]

Good reputation enhances positive self-image, which motivates prosocial behavior, a phenomenon known as indirect reciprocity. Thus, good reputation should promote prosocial behavior toward estranged people to whom affective responses leading to direct reciprocity are suppressed. We predicted that such behaviors involve an interrelationship between self-image, processed in the medial prefrontal cortex (mPFC) and precuneus, and social reward, processed in the reward system. To test our hypothesis, we performed fMRI on 21 participants during a virtual ball-toss game after subjects formed negative impressions (estrangement) or neutral impressions of other players. During some blocks of the game, the other players did not receive tosses, and participants could increase tosses to them (i.e. engage in prosocial behavior). Participants significantly increased tosses to all isolated players; therefore, prosocial behavior occurred irrespective of estrangement. Prosocial behavior toward estranged players enhanced positive self-image and increased activation of the anterior mPFC and precuneus. The precuneus exhibited enhanced functional connectivity with the striatum. Thus, a positive self-image, represented by an interaction between the midline cortical structures and striatum, plays key roles in prosocial behavior toward estranged people. [ABSTRACT FROM AUTHOR]

This article examines Edward Gordon Craig's analogy between drama and wood engraving, stage and printed page in his autobiographical handbook on wood engraving, Woodcuts and Some Words (1924). It explores the semantic shift of the notion of impression, from the symbolist realm of suggestion to that of modernist imprint, by taking Craig's interest in the world of print as materialization of his "new theatre" as a premise. It finally seeks to determine the significance of engraving in Craig's career, a medium that was the matrix, the relic and the archive of the images and of the ideal vision he pursued all his life. [ABSTRACT FROM AUTHOR]

This article is devoted to the edition of Walter Pater's "The Child in the House" printed on the private press of C.H.O. Daniel in Oxford in 1894. This edition may appear all the more surprising as it is deprived of illustrations, ornaments and miniation. However, if actual illustrations are missing—a usual practice of Pater's since the second edition of The Renaissance in 1877—they are nevertheless implied in the very facture of the 68-page booklet printed by the Provost of Worcester College. Both the edition and the literary portrait partake in a specific form of literary impression understood as a process that stamps the brain and remains there, to be aroused anew when one reads or when one is confronted with art, either visually or musically. Arguably, Pater chose the most appropriate form and edition for his quasi-autobiographical text, hovering between disclosure and self-concealment and exploring one's intimate past. Content and material form coalesce to present readers with an experiment in the representation of subjectivisation that was to find an echo in Freud's Entwurf to describe the workings of the psychical apparatus (1895). [ABSTRACT FROM AUTHOR]

Objective: Dental casts are an important aspect in the treatment planning, documentation, and analysis of the dental arch forms of infants with cleft lip and palate (CLP). Impression taking in a neonate is a technique-sensitive procedure, which can result in foreign body dislodgement and carries a small risk of aspiration and airway obstruction. The advent of digital dental technologies and intraoral scanning may facilitate safer, more effective, and accurate impressions for CLP infants. Design: A digital intraoral scan of a 3-month-old with bilateral CLP (BCLP) was compared with a conventional alginate impression taken prior to primary lip repair. Setting: Princess Margaret Hospital for Children. Main Outcome Measures: To test the applicability and accuracy of digital impression taking for a neonate with BCLP and palate using digital morphometrics. Results: The average deviation of points ranged above and below the plane of superimposition from +0.78 mm to −0.42 mm with a maximum range of +2.80 mm to −2.80 mm and standard deviation of 0.88 mm. The premaxillary segment showed the greatest degree of variation. Conclusions: This is to our knowledge the first report that illustrates the use of a digital impression system to scan the oral structures of a neonate with BCLP. Digital scanning was found to be fast, accurate, and safe, when compared to a conventional alginate impression technique. [ABSTRACT FROM AUTHOR]

For the fabrication of dental inlays and crowns precise information on tooth morphology is required. Besides the conventional method, the use of digital scanners has become an central part of impression making in dentistry. Intraoral scanners (IOS) are devices for capturing direct optical impressions. The purpose of this narrative review on the use of IOS was to discuss: (1) commercially available scanners, (2) the indications and contraindication, (3) precision of the digital impression compared to the conventional methods; (4) the advantages/limitations of using optical impressions. [ABSTRACT FROM AUTHOR]

Objective: To assess the clinical and laboratory time efficiency and quality of outcomes for posterior single implant crowns by means of a model‐free digital workflow using digital impressions immediately after implant placement. Methods: Forty patients missing a single posterior tooth received implant therapy. For within‐subject comparison, digital impressions were taken immediately after implant placement and conventional impressions after implant healing. Two monolithic zirconia crowns were fabricated using a laboratory‐based CAD‐CAM system. One crown was produced from the immediate digital impression and a model‐free digital workflow (test group), and the second crown was produced from the conventional impression and a hybrid workflow (control group). Clinical and laboratory time was recorded. Quality of outcomes was evaluated double‐blinded. A paired‐sample t test was applied for statistical analysis. Results: The total mean chairside time (impression and delivery) was 23.2 min (95%CI 22.2, 24.3) in the test group and 25.7 min (95%CI 24.4, 26.9) in the control group (p = 0.013). Significantly less laboratory time was needed in the model‐free digital workflow (13.6 min, 95%CI 11.5, 15.6) as compared to the model‐based hybrid workflow (29.9 min, 95%CI 25.7, 34.2) (p < 0.05). At crown delivery, 4/40 (test) and 12/40 (control) had no need of chairside adjustments, and 6/40 (test) and 5/40 (control) implant crowns were in need of additional laboratory interventions. Conclusion: The fabrication of posterior single implant crowns using digital impressions taken immediately after implant placement and a model‐free, laboratory‐based digital workflow was more time efficient and resulted in similar quality of outcomes as a hybrid workflow using conventional impressions. [ABSTRACT FROM AUTHOR]

Copyright of Logos: A Journal, of Religion, Philosophy Comparative Cultural Studies & Art (08687692) is the property of Logos and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Two adult male dogs (a 7‐year‐old shorthaired Chihuahua and 14‐year‐old Shih Tzu) and one adult female dog (a 9‐year‐old Maltese) presented for evaluation of new‐onset seizure activity. Magnetic resonance imaging of the brain demonstrated a large, poorly marginated T2‐weighted hyperintense, and strong contrast enhancing extra‐axial mass in each case. A surgical biopsy for histopathologic evaluation was elected in all cases, and intraoperative impression smears were successfully obtained. Intraoperative cytology identified a homogenous population of round to polygonal cells with central to eccentric nuclei, coarse chromatin, and variably amphophilic to eosinophilic granular cytoplasm. Cytologic findings led to a suspected diagnosis of granular cell tumor (GCT) in all cases. Histopathologic review identified a densely cellular, unencapsulated neoplastic mass comprised of sheets of large round to polygonal cells with abundant eosinophilic cytoplasm containing numerous eosinophilic intracytoplasmic granules, confirming the diagnosis of GCT in all cases. The cases reported here are unique in that they reveal an accurate intraoperative cytologic diagnosis of a rare canine central nervous system neoplasm. Intraoperative cytology of the intracranial masses could provide clinicians with important and quick diagnostic and prognostic information; therefore, expediting decisions made intraoperatively. Further research is warranted to determine the diagnostic accuracy of intraoperative cytology for neoplasia in veterinary patients. [ABSTRACT FROM AUTHOR]

Abstract Ferroelastic mechanical behavior of LaCoO 3 was investigated by the impression test and compared with the conventional compression test using digital image correlation technique for deformation measurement. The results show that the coercive stress for ferroelastic deformation can be detected by impression test, which is less than critical stress for such deformation in the compression test. Room temperature ferroelastic impression creep characterization showed different equilibrium penetration of flat-end punch at different constant stresses, which can be characterized by Prony series equation. [ABSTRACT FROM AUTHOR]

Abstract This research investigates a new phenomenon – foodstagramming, in which tourists embark on capturing and sharing food photos – using a mixed-methods approach in three studies. Study 1 assesses how foodstagramming experiences are phenomenologically constructed in a field inquiry. Studies 2 and 3 undergo a rigorous scale development process by setting forth a foodstagramming benefit scale, which measures tourist perceived value in capturing and sharing of food photos in social media. These two studies further test its nomological network via a relationship leading from impression management to travel satisfaction through foodstagramming benefits. Results address the conundrum in the literature, which conjectures why self-expression, enrichment of dining experience, social connection, virtual community engagement, and special occasion memory underpin the foodstragramming phenomenon and how they could reap favorable travel outcomes. This research further contributes to the hospitality and tourism industry with insights on technology mediated dining and travel experiences. Highlights • This research investigates foodstagramming and its phenomenological structure. • It develops the foodstagramming benefit scale. • It tests the impact of impression management on tourist satisfaction through the mediation of foodstagramming. • It offers the genesis of a new research stream that links photography, social media usage, computer-mediated communication, dining establishments, and tourism into an integrated framework of foodstragramming and travel. [ABSTRACT FROM AUTHOR]

Aim: Displacement of gingiva is essential for obtaining accurate impressions for the fabrication of fixed prostheses, particularly when the finish line is at or within the gingival sulcus. Various newer impression materials have been introduced to achieve gingival displacement while recording the impressions. A comparative evaluation of these new gingival displacement materials was deemed necessary for efficacy in tissue management and dimensional accuracy. Materials and Methods: Ten individuals were selected according to the inclusion and exclusion criteria for gingival displacement using retraction cord impregnated with aluminum chloride and two polyvinyl siloxane impression materials (Aquasil and NoCord VPS impression system) according to Latin block design. Intraoral scanner and Vernier caliper were used to study and compare the dimensional accuracy of each die obtained following which the dies were sectioned and evaluated under optical microscope with image analyzer to measure the amount of gingival retraction. Results and Conclusion: Statistical analysis showed that the amount of gingival retraction obtained by using retraction cord impregnated with aluminum chloride as gingival retraction agent was maximum as compared to NoCord followed by Aquasil. All three gingival displacement techniques could produce gingival displacement >0.2 mm which is the optimum amount of retraction required for impression making. All the three materials are found to be dimensionally accurate. [ABSTRACT FROM AUTHOR]

PURPOSE. Comparing the accuracy of casts produced from digital workflow to that of casts produced from conventional techniques. MATERIALS AND METHODS. Whole arch alginate (ALG) and polyvinyl siloxane (PVS) impressions were taken with stock trays and custom trays, respectively. The ALG impressions were poured with type III dental stone, while the PVS impressions were poured with type IV dental stone. For the digital workflow, IOS impressions were taken and physical casts were produced by 3D printing. In addition, 3D printed casts were produced from images obtained from a laboratory scanner (LS). For each technique, a total of 10 casts were produced. The accuracies of the whole arch and separated teeth were virtually quantified. RESULTS. Whole arch cast accuracy was more superior for PVS followed by LS, ALG, and IOS. The PVS and ALG groups were inferior in the areas more susceptible to impression material distortion, such as fossae and undercut regions. The LS casts appeared to have generalized errors of minor magnitude influencing primarily the posterior teeth. The IOS casts were considerably more affected at the posterior region. On the contrary, the IOS and LS casts were more superior for single tooth accuracy followed by PVS and ALG. CONCLUSION. For whole arch accuracy, casts produced from IOS were inferior to those produced from PVS and ALG. The inferior outcome of IOS appears to be related to the span of scanning. For single tooth accuracy, IOS showed superior accuracy compared to conventional impressions. [ABSTRACT FROM AUTHOR]

Purpose: To compare the effect of 3 tray designs and 3 commonly used impression materials on the displacement of flabby tissue during maxillary edentulous impression by superimposition of 3D digital models. Materials and Methods: Fifteen maxillary edentulous casts with simulated flabby tissue were fabricated by modifying a standard maxillary edentulous acrylic resin cast. Three types of impression trays were fabricated: trays with conventional relief, trays with additional relief, and trays with an open window. Three impression materials were tested: light‐body polysulfide, light‐body vinylpolysiloxane, and zinc oxide eugenol paste. For the analysis of tissue displacement during impression making, the test and control stone casts were scanned using a 3D laser scanner, and the 3D digital models were superimposed using metrology software. Statistical analyses were performed with an α = 0.05. Results: Negative deviations were recorded at the areas of the alveolar crest, posterior part of flabby tissue, and middle of the palate. On the other hand, a positive deviation was recorded at the area of the anterior part of flabby tissue. A significant difference in the displacement of flabby tissue was found when using different tray designs (p < 0.0001). The tray with the open window showed significantly low tissue displacement at the flabby tissue region. Depending on sites, the amount of flabby tissue displacement showed different significances by the different impression materials used (anterior part: p < 0.0001; alveolar crest: p = 0.097; posterior part: p < 0.0001). Conventionally relieved trays showed significantly higher values of displacement at the anterior part of flabby tissue (p < 0.0001), while trays with open windows showed similar values of displacement at all measuring points, and no significant differences among different impression materials were found (p = 0.104). Conclusions: There were significant differences in the displacement of flabby tissue with different tray designs, especially with displacement occurring at the anterior and posterior parts of flabby tissue. Tray designs should be considered in order to make proper impressions when flabby tissue is present. [ABSTRACT FROM AUTHOR]

Purpose: The aim of this study was to present a new method to analyze the three-dimensional accuracy of complete-arch dental impressions and verify the reliability of the method. Additionally, the accuracies of conventional and intraoral digital impressions were compared using the new method. Methods: A master model was fabricated using 14 milled polyetheretherketone cylinders and a maxillary acrylic model. Each cylinder was positioned and named according to its corresponding tooth position. Twenty-five definitive stone casts were fabricated using conventional impressions of the master model. An intraoral scanner was used to scan the master model 25 times to fabricate 25 digital models. A coordinate measuring machine was used to physically probe each cylinder in the master model and definitive casts. An inspection software was used to probe cylinders of digital models. A three-dimensional part coordinate system was defined and used to compute the centroid coordinate of each cylinder. Intraclass correlation coefficient (ICC) was evaluated to examine the reliability of the new method. Independent two sample t-test was performed to compare the trueness and precision of conventional and intraoral digital impressions (α = 0.05). Results: ICC results showed that, the new method had almost perfect reliability for the measurements of the master model, conventional and digital impression. Conventional impression showed more accurate absolute trueness and precision than intraoral digital impression for most of the tooth positions (p < 0.05). Conclusions: The new method was reliable to analyze the three-dimensional deviation of complete-arch impressions. Conventional impression was still more accurate than digital intraoral impression for complete arches.

Introduction: A dental impression is a negative imprint of an oral structure that can be used to produce a positive cast of a patient's teeth as a permanent record. The accuracy of the impression affects the accuracy of the cast, and a precise impression is needed in order to create prosthesis with optimal fitting. Minimization of misfit is an important aim in prosthesis science and dental implants. The aim of this study was to evaluate the effects of the materials and techniques used to take an impression on the vertical misfit of implant-supported, screw-retained, three-unit bridges. Materials and Methods: The principal model used was an acrylic block with two ITI implants. A 1.5-mm abutment was attached to fixtures with torque of 25 N.cm. A base-metal framework was built on the abutment in the acrylic block. The abutments of the acrylic model were unscrewed and fixture-level impressions were made. The impression techniques included open/closed-tray techniques and the impression materials were polyether and polyvinyl siloxane. Forty acrylic custom trays were built for each impression. The marginal gap in the framework at three points (buccal, lingual, and distal) was measured using an optical microscope with ×250. Results: It is demonstrated that in all 360 evaluated samples, the mean vertical misfit in polyether samples of molar and premolar teeth was significantly lower than in polyvinyl siloxane (P < 0.001 and P = 0.017, respectively) in all three locations of the molar and lingual premolar examined (buccal, lingual, and distal), the mean vertical misfit of the polyether samples was significantly lower than those of polyvinyl siloxane (P < 0.01). On the other hand, although the mean vertical misfit using the open-tray technique in the molar teeth was significantly lower than with the closed-tray method (P = 0.002), no statistical difference was seen between the open-tray and closed-tray technique in general (P = 0.87). Conclusion: Within the limitations of this study, the following conclusions can be drawn: The impression method had no effect on marginal discrepancy of 3-unit screw retained fixed partial dentures. A higher marginal accuracy was obtained using polyether impression material compared to polyvinyl siloxane.

Background: If the impression thickness is uniform, stock trays can also give a better result when compared to custom trays. Purpose: This study aimed to obtain a uniform thickness impression with a modified putty-wash two-step technique. Materials and Methods: A chairside method of putty-wash two-step impression in a stock tray was made utilizing a wax spacer. Results: A uniform thickness impression was obtained in stock tray in quick time. Conclusion: The current article has given the options of using wax as spacer for making putty wash two step impressions for the fabrication of tooth-supported fixed restorations. Further research is required to find whether there is any dimensional inaccuracy caused in restorations due to usage of wax as a spacer.

The aim of the article is to improve the technology of clasp dentures manufacture. Material and Methods. Orthopaedic treatment of 27 patients was conducted using advanced technology of manufacturing clasp dentures at the Department of Prosthetic Dentistry at Samara State Medical University. Results. Conducting the orthopaedic treatment a method of obtaining an impression in prosthetics on implants and teeth, a method of manufacturing clasp denture with locking fasteners and a method of manufacturing a clasp denture with a questionable prognosis of bearing tooth were used. Conclusion. Using the advanced technology of manufacturing clasp denture has solved the problem with unreliable periodontal tissues, loss of a removable part of clasp denture and allowed to improve the quality of obtaining impression from bearing teeth.

This study aims at individualizing an essential stage of treatment, namely the functional impression, the quantification of the decisive factors in the selection of the impression method, in full agreement with the particularity of the prosthetic field, in order to ensure an optimum management of the removable prosthetic therapy. Various types of impressions on implants have been recorded in the case of implanto-prosthetic rehabilitation, using different types of impression materials and different types of impression trays. Within implant impression, the impression material is applied by means of a syringe around the transfer devices and then the material loaded tray is applied in the oral cavity. Upon removal of the impression, the transfer devices remain fixed in the impression and then the impression is assessed from the point of view of the faithful representation of all the particularities of the prosthetic field. At the same time, the correct fixation of the devices is verified and whether there is or nor impression materials on their surface of adaptation with the implant.The choice of the impression material, corroborated with the impression method, is dictated by the particularities of the clinical case. The prosthetic solution of choice, as well as its performance requirements, are an essential condition in the choice of the impression material.

Socially anxious tendencies have potential to become social anxiety disorder (SAD), which is characterized by fear of social situations associated with being evaluated or embarrassed by others. In particular, others’ gazes induce social anxiety. People with SAD have a negative interpretation bias toward ambiguous emotions in others’ faces; however, negative interpretation bias toward ambiguous emotions in others’ gazes has not been fully investigated. We used an impression judgment task to examine negative interpretation bias toward others’ gazes among people with socially anxious tendencies. We generated emotionally ambiguous gazes (positive, negative, and neutral) using a morphing technique with 10% steps (neutral, 10–100% negative, and 10–100% positive). Participants (all male) were asked to judge whether the stimulus was positive or negative. Each participant’s level of social anxiety was examined using the Japanese version of the Social Phobia Inventory (SPIN-J), which measures three symptom dimensions: fear, avoidance, and physiological arousal. To examine the influence of socially anxious tendencies in the impression judgment task, we calculated the point of subjective equality (PSE) using a two-step logistic curve fitted to individual participant’s responses. The negative emotional intensity of the PSE became lower as the fear score became higher (p < 0.05). This result suggests individuals with a high tendency toward social anxiety tend to interpret subtle negative emotional gazes as a negative emotion and regard these gazes as a threat.