Document Type : Original Article
Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Modern University for Technology and Informations (MTI)
Associate Professor, Fixed Prosthodontics Department, Faculty of Oral and Dental Medicine, Modern University for Technology and Informations (MTI) University
Aim: This study aimed to compare the efficacy, of 4 different intra-oral scanners and a conventional impression technique, to produce marginal and internal adaptation of indirect restorations.
Materials and Method: A total of 25 lower right acrylic second molar models were selected for the preparation of standardized MOD inlay cavities. Prepared acrylic molar models were divided into 5 groups according to digital or conventional impression used: Group I: CEREC Primescan, Group II: Medit i700, Group III: Smart scan 3D version 2, Group IV: Aoralscan 3, Group V: Flexceed additional silicone impression. Inlay restorations were milled from E-max blocks. Inlays were cemented in corresponding cavities using self-adhesive resin cement (Panavia SA). The restored teeth models were cut in buccolingual and mesiodistal directions. Measurement of the gap at buccal, lingual, and pulpal tooth-restoration interfaces was performed using a stereo microscope. Image analysis software was used to assess internal adaptation. Results were obtained and statistically analyzed.
Results: Group I had significantly the least average gap (39.17 ± 2.08 µm), followed by Group II (43.82 + 1.82 µm) which was insignificantly lower than Group V (46.92 + 2.77 µm). Group IV had a significantly wider gap (55.66 + 2.99 µm) than Group V, while Group III had a significantly wider gap (60.21 ± 1.66 µm) than all the other groups.
Conclusion: Primescan is the most efficient system, flowed by both Medit i700 system and Flexceed additional silicone impression, while Smart scan 3D version 2 is the least accurate system followed by Aoralscan 3 system.