Document Type

Article

Publication Date

2024

Abstract

Background. The durability of indirect restorations is significantly influenced by marginal adaptation and internal fit. The use of computer-aided design/computer-aided manufacturing (CAD/CAM) with digital impressions has reduced dental prosthesis fabrication errors and improved its long-term survival. Objectives. This study aimed to assess the impact of intraoral and extraoral scanning methods on the internal fit and marginal accuracy of 2 different types of monolithic crowns manufactured using CAD/CAM. Material and methods. Forty 3D resin-printed dies were assigned to 2 groups based on the type of crown material (n = 20 per group). Each group was further divided into 2 subgroups (n = 10 per group) according to the die scanning technique: subgroup A was scanned using intraoral digital scanner (IOS) Primescan; subgroup B was scanned using extraoral scanner (EOS) inEos X5. The digitized photos were converted into a 3D virtual crown design using CAD software. The internal discrepancy values and the marginal gap distance between the 3D resin-printed die and the crown were assessed using a 50 digital microscope. The data was checked for normality using the Kolmogorov–Smirnov test, and the Mann–Whitney test was used to compare between the groups. The collected data was analyzed at a significance level of < 0.05. × Results. The scanning techniques and crown materials had a statistically significant effect on the vertical marginal gap distance (µm) and internal fit of the crowns (p > 0.05 [or p < 0.05?]) [What about material comparison in terms of internal fit? The differences were not significant.]. The crown parameters tested with both scanning systems were within the clinically acceptable range. Conclusions. The scanning methods and crown materials had an impact on the internal fit and vertical marginal gap distance of monolithic crowns.

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