Date on Master's Thesis/Doctoral Dissertation

5-2015

Document Type

Master's Thesis

Degree Name

M.S.

Department

Oral Health and Rehabilitation

Degree Program

Oral Biology, MS

Committee Chair

Zandinejad, Amirali

Committee Co-Chair (if applicable)

Metz, Michael

Committee Member

Abdel-Azim, Tamer

Committee Member

Demuth, Donald

Committee Member

Darling, Douglas

Subject

Fillings (Dentistry); Teeth--Radiography

Abstract

This in vitro study compared marginal gap size in anterior lithium disilicate veneers produced by conventional and digital impressions. One typodont right central incisor was prepared for an all-ceramic cast. Ten conventional veneers were fabricated using Type IV stone, PVS, and IPS e.max press, while ten digital veneers were fabricated using Lava COS (3M ESPE) and IPS e.max CAD/CAM processing and milling. Samples were divided double-blindly, captured at 45X magnification, evaluated at three images per orientation (B-D-M-P), and measured at three distances (largest, smallest, best fit) per image. Data points were entered into SPSS code for one-way and two-way ANOVA, t-testing, Chi square, and odds ratio. Compared to conventional technique, digital veneers recorded greater mean gap distances at all orientations, fewer “good fit” locations, and average gap size ≥ 120 μm. All analysis techniques were statistically significant. In vivo follow-up is necessary to justify digital impressions in clinical settings.

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