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.
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