In this study, thickness of the restorations, tooth vitality, and location of teeth in the dental arch influenced restoration failures.

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Objective The purpose of this in vitro study was to compare the marginal and internal fit of pressed lithium disilicate veneers fabricated from a 3D printed castable wax resin versus a manual waxing technique. Materials and Methods A typodont model central incisor was prepared for a porcelain veneer. Following stone model fabrication from a polyvinyl siloxane impression, the model was digitized using a laboratory scanner. Group 1 veneers were designed digitally and 3D printed with a castable wax resin, then pressed. Group 2 veneers were fabricated using a manual wax and press approach. Veneers from both groups were bonded to printed dies. Following measurements of marginal adaptation under a stereo microscope, the dies were sectioned and measurements were made for internal adaption. Statistical analysis included a Kolmogorov test and a Mann–Whitney U test. Results Average marginal gap (μm) for Group 1 was 40.37 ± 11.75 and 50.63 ± 16.99 for Group 2 (p = 0.51). Average internal gap (μm) for Group 1 was 61.21 ± 18.20 and 68.03 ± 14.07 for Group 2 (p = 0.178). Conclusion There was no difference in marginal fit or internal fit between pressed lithium disilicate veneers fabricated with a 3D printed castable resin and those fabricated with a manual waxing technique. The use of digital technologies and 3D printing provide significant advantages in the fabrication of pressed glass ceramic veneers, with marginal and internal adaptation comparable to manual wax and press techniques.

Summary: Restoration of the endodonticallytreated teeth is a controversial topic in restorative dentistry, since many options exist to restorewhole or partially dental crowns. The option for treatment is not selected based on a precisediagnosis of the state of the dental remanent and differences between anterior and posterior teethare not evaluated. Therefore, a classification of the extension defects of endodontically posteriorteeth (EPT) is presented. This classification is based on 4 specific variables: vertical height andwalls distribution of supragingival remaining coronal tooth structure or core, diameter and rootcanal depth, and the distance of floor pulpar chamber and the root furcation. The correctapplication of this classification can help the operator to choose the best treatment option for thereconstruction of EPT, also this classification can help investigators to reach more organizedresults in future investigations on the reconstruction of EPT. Key words: Post and core. Endodontic.Diagnostic characteristics.

Rehabilitation of the partially edentulous anterior maxilla is considered one of the most difficult challenges for the restorative dentist due to the esthetic, functional and psychological implications. Implant-supported restorations provide an appealing treatment alternative that responds to today’s patient expectations. The gold standard for this scenario has been the use of an implant-supported fixed partial denture with pontics that masks the soft tissue deficiencies, with acceptable esthetic results. However, nowadays patients are looking for individual single crowns since they believe that this type of restorations resemble the natural dentition, are easy to clean and floss. From the dentist perspective, they are easy to maintain and in case of prosthetic complications they can be repaired or changed without compromising the adjacent restorations. Three parameters have been identified that could guide the decision-making process when multiple adjacent implant supported restorations (MAISR) are selected as the treatment of choice: 1) Smile line 2) Inter-implant distance and tooth-implant distance 3) Patient's expectations and ability to clean.

Summary: A classification of the extension defects ofendodontically anterior teeth is presented. This classification is based on the amount of remanentcoronal tooth after an essential treatment has been done, such as: root canal therapy, removal ofcarious tissue, periodontal surgery whenever needed and tooth preparation either for the placementof a direct restoration material such as composite or a post and core and full crown restoration.This classification is based on 3 specific variables: supragingival remaining coronal toothstructure or core height, diameter and root canal depth. Key words: Post and core. Root canaltreatment. Diagnostic.

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