الفهرس 
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Abstract
The aim of this in-vitro study was to evaluate the effect of abutment tooth geometry on the accuracy of two intraoral scanners.
Methodology: The present study was conducted using maxillary typodont. Six full coverage
crown preparations were performed on central incisors, 1st premolars and 1st molars with
known axial wall taper (6o
and 12o
) using dental parallelometer. Highly accurate table-top
scanner (Identica T500) was used to obtain reference scan to the typodont. Two intraoral
scanners (3shape Trios and Medit i500) scanned the typodont 13 times to obtain total samples of
prepared teeth (n=39) for each group. All scans were exported in standard tessellation language
(STL) format. Measurements of trueness and precision for respective tooth preparation were
evaluated using reverse engineering software for superimposition and deviation analysis.
Comparison between groups was performed by using One-Way ANOVA test followed by
Tukey`s Post Hoc test and Independent t- test.
Results: Statistical analysis showed no significant difference in trueness between the two intraoral
scanners. Trueness values were 39.9 µm and 41 µm for 3shape Trios 3 and Medit i500. 3shape
Trios 3 was significantly more precise (23.6 µm) compared to Medit i500 (34.7 µm). Difference in
axial wall taper showed no significant difference in accuracy of both intraoral scanners.
Conclusions: Trios 3 scanner have better precision than Medit i500. Increasing axial wall taper had
slight effect on the accuracy of scans obtained by two intraoral scanners.