Bulletin of Stomatology and Maxillofacial Surgery
ISSN 1829-006X
2025; 401–405
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A COMPARATIVE EVALUATION OF THE ACCURACY OF TOOTH PREPARATION FOR VENEERS: CONVENTIONAL METHODS VERSUS DIGITALLY GUIDED TECHNIQUES - AN IN VITRO STUDY

Joephin Soundar*

Received: 2026-04-08 · Published: 2025-07-28

© 2025 The Author(s) and the original publisher.

CC BY-NC 4.0 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
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Original title
A COMPARATIVE EVALUATION OF THE ACCURACY OF TOOTH PREPARATION FOR VENEERS: CONVENTIONAL METHODS VERSUS DIGITALLY GUIDED TECHNIQUES - AN IN VITRO STUDY
Author
Joephin Soundar
Source journal
Bulletin of Stomatology and Maxillofacial Surgery
Published
2025-07-28
Licence
Creative Commons Attribution-NonCommercial 4.0 International
Original
https://doi.org/10.58240/1829006X-2025.21.6-401

Abstract

This in vitro study aimed to compare the accuracy of three different veneer preparation techniques: conventional freehand (CM), silicone reduction guides (ERG), and CAD/CAM 3D-printed guides (DG). Thirty maxillary central incisor typodont teeth were randomly assigned to three groups (n = 10 per group). A single experienced operator carried out all preparations to minimize operator variability. The CM group used calibrated depth-cut burs without any guide, the ERG group used silicone indices fabricated from diagnostic wax-ups, and the DG group used digitally designed and 3D-printed reduction guides. Pre-preparation and post-preparation scans were obtained and analyzed using Geomagic Control software to evaluate the mean absolute difference (MAD) and standard deviation (SD) of tooth reduction. The results revealed that the DG group exhibited the highest accuracy and precision in maintaining the planned reduction depth, followed by the ERG group. While the ERG technique provided improved control over freehand preparation, some deviations were observed due to the inherent flexibility and distortion of the silicone material. The CM group showed the least accuracy, with greater variability in reduction. Overall, the digitally guided method demonstrated superior control, precision, and conservation of tooth structure, highlighting its clinical advantage in aesthetic veneer preparations.
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