Search

The finite element method (MEF) has been a methodology proposed in the laboratory evaluation of the mechanical behavior of endodontic instruments, as well as the potential of this resource for laboratory research. A review of 30 articles in the literature on the finite element method (MEF) was carried out to evaluate if the method is an advantageous alternative in the study of the mechanical behavior of endodontic files. The fracture of the endodontic instruments is linked to the geometry of the product and the finite element method allows to analyze with greater precision the distribution of tension throughout the instrument. Given the information gathered in the literature, this method allows access to information that is very difficult to obtain with other mechanical tests in the laboratory, thus being a valuable tool to assist engineering teams in important tasks in the development or adjustment of a product. [ABSTRACT FROM AUTHOR]

The Enterococcus faecalis are microorganisms frequently found in persistent endodontic infections and are probably the best species to adapt to and tolerate the poor ecological conditions in root canal obturation. In order to show which characteristics make E. faecalis so resistant and to verify its susceptibility to different antimicrobial agents, a broad literature review of the literature was performed aiming to analyze the performance of the intracanal medication on this etiologic agent. The search was based on access to the Pubmed and Bireme databases. Fifty manuscripts met the inclusion criteria and were used in this review. The results showed that E. feacalis a rapid recovery from nutritional deprivation and environmental stress, has strong factors of viirulence and is located in places difficult to reach the endodontist. When submitted to different intracanal medicinal products, E. faecalis had a higher susceptibility to those containing chlorhexidine. However, this bacterium still presents a high level of complexity in its elimination and a potential risk to endodontic failure. [ABSTRACT FROM AUTHOR]

Introduction: obtaining the anatomical model represents an important step in the diagnosis and planning of prosthesis, so it must be obtained through a correct molding technique, observing all anatomical accidents relevant to a good impression. Objective: to emphasize, through a clinical case report, that the modified molding technique can achieve success when indicated and performed correctly. Case report: This paper reports an alternative molding technique for Kennedy's Class I Removable Partial Prosthesis in patients with resorbed edges and soft tissue excesses. Final considerations: the technique of molding using an alternative technique allows the correct impression of the edentulous area to be obtained through a simple technique. [ABSTRACT FROM AUTHOR]

Introduction: tomographic images produced by conical beam tomography (CBCT) may replace conventional radiographic images, since the use of this tomographic resource resides in the reproduction as close as possible to the three-dimensional craniofacial morphology. Objective: to provide information to orthodontists about the types of 3D and 2D cephalometric analysis that can be applied in orthodontic planning, its evolution and applicability. Since the use of cephalometric methods, mainly 3D, has been little used by orthodontists, it was collected as much information related to the types of tomography together with the cephalometric analyzes as possible. Material and Methods: a review of 38 articles in the literature on 3D and 2D cephalometric analyzes was carried out to evaluate if three-dimensional cephalometric analyzes are a more efficient diagnostic method than two-dimensional cephalometric analyzes and, if it can contribute to elucidation of the diagnosis with accuracy, for the correct orthodontic treatment planning. Results: regarding the types of cephalometric analysis employed, the 3D techniques of cone beam were highlighted. Conclusion: based on the information collected in the literature, it was concluded that the value of the cephalometric analysis depends on the accuracy of the technique because the errors can lead to an incorrect diagnosis and planning. [ABSTRACT FROM AUTHOR]

Introduction: a variety of studies has shown that low-power laser stimulates osteogenesis. The mechanisms proposed for the biostimulating effect of the laser involve increased ATP synthesis and formation of reactive oxygen species (ROS) by mitochondria. These EROs, including hydrogen peroxide, act on cell signaling and influence the regulation of gene expression, leading to cellular responses at hours or even days after irradiation. Peroxiredoxins (Prxs) constitute a family of abundant enzymes capable of breaking down hydrogen peroxide. Objective: a literature review was carried out on the biostimulating effects of low power laser on oxidative stress during the cicatrization process. Material and Methods: a search of the PubMed and Scielo databases was carried out in recent years, following inclusion and exclusion criteria, using as descriptors peroxirredoxin, low power laser and osteoblasts. Results: fifty full-text articles were identified that fit the inclusion and exclusion criteria. As for the types of Peroxirredoxins, Prxs I and IV were highlighted. Conclusion: In light of the information gathered in the literature, we conclude that the mechanisms of action of the laser induce the formation of EROs, and we also stress the importance of establishing safe parameters in the laser application so that the desired effects of biostimulation are achieved and that toxic effects are avoided. [ABSTRACT FROM AUTHOR]

Introduction: the phylogenetic similarities between non-human primates and humans stimulate studies of their stomatognathic system, aiming their use in research. Objective: the objective of this study was to describe the anatomical structures of the maxilla and mandible of Cebus apella comparing to human characteristics. Material and Method: two adult animals were used. After removing the organic tissue, the skulls and jaws were x-rayed and photographed, being analyzed with the magnifying glass. Results: the results showed that the anatomical structures of the maxilla and the mandible had similar characteristics to the human being, but with some peculiarities, such as: the presence of the third premolar; prominent canine prominences in both arches; the mental setting of the majestic; width of ascending branch of maxilla; the presence of the mandibular foramen; V shape of the jaw; incisor foramen size; presence of the incisive suture. With respect to the radiographic interpretation of the pulp chamber and root canal of this species, the maxillary and mandibular maxillary teeth, maxillary and mandibular maxillary teeth are teeth with single, wide, easily accessible ideal for endodontic experiments. Conclusion: thus, the authors conclude that Cebus apella can be used as a study model in endodontic treatment. [ABSTRACT FROM AUTHOR]

Actuality the use of Fixed Partial Denture with Cantilever until causes many doubts, making de dentist do not indicate this treatment. To making clear the characteristics relation to this prosthesis, was done a literature review. A search was performed in the Scielo and Pubmed databases using the keywords: Fixed prosthesis, cantilever, supporting teeth. The articles within the scope of the study were selected and it can be concluded that these were an alternative excellent to reestablish the follow teeth, therefore to obtain the good results with respect long-term prosthetic appliances, special attention should be dispensed to the biomechanics principles and optimal hygiene with plaque control should be established. [ABSTRACT FROM AUTHOR]

Iatrogenic perforation is a procedural incident that may occur in endodontic treatments of primary and/or permanent teeth. Prognosis may be favorable if a complete seal with biomaterial is immediately established. Several materials, including glass-ionomer cement (GIC), have been used to seal different types of perforation defects. GIC is considered to be biocompatible, nontoxic, and non-irritating, and promotes bone healing and cementum regeneration. In the present case, GIC was used to treat an endodontic perforation. The perforation was cleaned with periodontal curettes and sealed with GIC. A reintervention was needed in which sealing was performed with a light-curing GIC, a material that was less rough than the initial material used. After 2 years, the absence of periradicular radiolucent lesions, pain, and swelling along with functional tooth stability indicated a successful outcome of sealing perforation in the case.