Assessment of Marginal and Internal Fit of Implant-supported Monolithic Zirconium Single Crown Fabricated from Three Different Intraoral Scanners: An In Vitro Study.

Aim: This study assessed the vertical marginal and internal fit of a single monolithic zirconia crown supported by an implant fabricated digitally from three different intraoral scanners (IOSs).

Materials and methods: A total of 30 models of implant-supported single monolithic zirconia 3Y-TPZ crown invested in epoxy resin were classified into two groups: 15 models for the marginal fit test and 15 for the internal fit test, which, based on the IOS that was employed, was then split into three subgroups (n = 5). A stereomicroscope with a 20× magnification was used to investigate vertical marginal fit. The replica technique was used to examine the samples' internal fit. The two-way analysis of variance and Tukey's honestly significant difference test (α = 0.05) were used to tabulate and statistically analyze the data, and p < 0.05 was used to determine whether the values were significant.

Results: The calculated marginal gap results (µm) of samples fabricated with the Prime scanner was (44.4 ± 3.21 µm), followed by 3Shape scanner (52.7 ± 2.70 µm), and the highest detected gap was in samples fabricated and scanned by Omnicam scanner (62.8 ± 2.11 µm) at p ≤ 0.05. The detected internal fit of samples manufactured by the Prime scanner was (89.07 ± 4.22 µm) followed by the 3Shape scanner (97.24 ± 5.74 µm), and the least accurate (highest internal gap) was detected in samples scanned and fabricated by Omnicam scanner (120.41 ± 25.10 µm) at p ≤ 0.05.

Conclusion: The IOSs showed a significant difference in accuracy, as the Prime scanner showed the best marginal and internal fit results followed by 3Shape. The least accurate was Omnicam scanners.

Clinical significance: This study postulated that the success of implants supported by fixed single restoration depends on multiple factors. The marginal and internal fit are governing factors that lead to a successful long-life implant-supported single crown restoration. How to cite this article: Shoeeb ME, Abu-Eittah MRH. Assessment of Marginal and Internal Fit of Implant-supported Monolithic Zirconium Single Crown Fabricated from Three Different Intraoral Scanners: An In Vitro Study. J Contemp Dent Pract 2025;26(2):169-177.