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Our study aims to investigate the acid etching treatment effects applied on dental structures, considering their surface properties. We have used a liquid PA in a concentration of 36.1% wt. (36.1% PA) and a gel PA with 35% wt. (35% PA) active compound as etching agents. These substances were applied to the human teeth for a maximum of 15 seconds. As investigation methods, the surface roughness was determined based on atomic force microscopy (AFM), and we analyzed the surface morphology in detail using scanning electron microscopy (SEM). Then, we analyzed the hydrophile character of the dental structure by experimentally measuring the contact angle (CA) and computed the surface energy (SFE). Following this study, we can say that both investigated etching treatments produce the demineralization of both enamel and dentine structures, with a higher degree in the case of liquid PA (36.1%). Increasing the values for the surface free energy will favor better infiltration and polymerization of the bonding systems. [ABSTRACT FROM AUTHOR]

Aim of the study: The aim of this study is to evaluate the resistance of different marginal fit geometries for a provissional fixed dental prothesis, which can have an impact on the periodontal health. Materials and methods: Acording to the principles of the tooth preparation, four types of marginal design were made: feather edge, rounded shoulder, chamfer and heavy chamfer. Using a direct technique, prepared teeth were poured into metal abutments, temporary composite resin crowns were made and cemented. All four abutments were analyzed using theoretical and experimental methods. Results: The results obtained from the mechanical tests were more reliable than those obtained from numerical analyses. A chamfer marginal finish line a pre prosthetic periodontal therapy can have greater impact on the soft tissue healing process. Conclusions: These preliminary studies enhance the idea of differentiating preparations for distinctive alternative prosthetic treatment plans. [ABSTRACT FROM AUTHOR]

This article, published in the Romanian Journal of Oral Rehabilitation, examines the impact of various fabrication methods on the flexural strength of complete dentures. The study compares three different technologies: the classic press packing process and traditional polymerization, the injection technology and polymerization under constant pressure, and an original suction-injection process with polymerization under continuous pressure. The findings indicate that the suction-injection method with sustained pressure polymerization produces superior results compared to the other two methods. The study highlights the importance of selecting the appropriate fabrication technology to ensure the durability and strength of denture bases. [Extracted from the article]

This article explores the application of Optical Coherence Tomography (OCT) in evaluating the temperature variations during the sintering process of dental prosthetics. The study utilized OCT to examine metal-ceramic restorations at different sintering temperatures and generated cross-sectional images to identify defects and structural changes. The findings demonstrate that OCT can provide valuable insights into the impact of temperature deviations on ceramic microstructure, making it a useful tool for quality control in dental laboratories. The article suggests that integrating OCT into routine practices can offer a rapid, accurate, and non-destructive means of assessing sintering temperatures and detecting defects in dental ceramics. [Extracted from the article]

This article discusses a study on the mechanical assessment of metal structures in dental prostheses that were repaired using laser welding and plasma welding. The study found that both methods can be used for repairs, but laser welding offers higher mechanical strength compared to plasma welding. Factors such as surface preparation, wire diameter, and the mechanical properties of the alloy used also influence the success of the repairs. The article concludes that laser welding is a viable option for repairing metal frameworks in dental prostheses, despite the samples fracturing under high mechanical loads. [Extracted from the article]

Background. Anxiety is widely known in dentistry. Even though it is a very recurrent issue, no protocol has yet been established that could be used for definite results. Aims. The aim was to review the literature in order to find effective strategies employed by dentists that could help patients to overcome their anxiety. Methods. A review of 24 articles on Pubmed platform using the terms: "dental anxiety", "physical activity", "sports" and "exercise" was conducted. We chose publications discussing the possible solutions for managing dental anxiety. Results. The solutions proposed in the scientific literature included: cognitive-behavioral therapy, relaxation techniques, premedication with sedative drugs (benzodiazepine), music distraction, hypnosis, acupuncture, inhalation sedation, aromatherapy with essential oils, parental presence/absence for children and audiovisual distraction. Conclusions. Cognitive-behavioral therapy seemed to be the most efficient method for patients to overcome dental anxiety. Repeated exposure to dental treatment increased the efficiency of the other strategies. [ABSTRACT FROM AUTHOR]