Three-Dimensional Accuracy of CAD/CAM Titanium and Ceramic Superstructures for Implant Abutments Using Spiral Scan Microtomography

Abstract

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Marginal and Internal Fit of Cobalt-Chromium Fixed Dental Prostheses Generated from Digital and Conventional Impressions

“…With this technique the marginal gap can easily be defined and measured, although measurements will only be carried out in the defined slices. Prasad and Al-Keraif used spiral scan microtomography to make a 3D measurement of the spatial gap values in the cervical area and a traveling microscope to measure marginal gap at 16 equidistant points [26]. Rungruanganunt et al used micro-CT technology for 3D evaluation of precementation space by imaging ultralight body VPS impressions of the precementation space; however, with this technique marginal fit was not measured [27].…”

Ajuste marginal e interno de restaurações de cerâmica pura fabricadas em CAD / CAM: uma revisão da literatura

“…24 Besides that, a parallel reported in literature concerns the association between a software tool that allows to adjust cement spacing and marginal adaptation. [25][26][27] For the CAD/ CAM E4D system (E4D Dentist system; D4D Technologies), according to Mosley et al, 25 the best spacing would be of 30 µm or 60 µm in terms of marginal maladjustment. The spacing of 50 µm is also supported in literature.…”

“…The spacing of 50 µm is also supported in literature. [25][26][27] Despite being still controversial, a difference can also be noticed concerning the way that tooth preparation digitalization occurs. According to Ahrberg et al, 28 direct digitalization shows a better result for marginal precision in relation to indirect ones, when a conventional mold is done and the plaster model is scanned.…”

Complete-arch implant-supported frameworks produced by different manufacturing techniques and materials: a stress deformation and internal fit analysis

“…The x-ray microtomography methodology 88 is the more recent and has been cited as the most appropriate method for internal fit restorations evaluation 89 allowing a threedimensional, non-destructive and non-invasive way of evaluation. 90,91 In this study, the tension tests and x-ray microtomography test values presented a positive correlation, showing that as higher the peri-implant deformation, the better the framework fit, with the opposite being true, that is, as worse the fit, less stress will arrive on bone. Other studies also reported this relationship 14,19 , in which authors state that the misadjustment may be responsible for the magnitude and distribution of stresses.…”