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- Influence of adjacent restorative material and distance on the accuracy of inlay cavity impressions with intraoral scanner: an in vitro study
- So-Yeon Lee, Sung-Ae Son, Jae-Hoon Kim, Deog-Gyu Seo, Jeong-Kil Park
- J Korean Acad Conserv Dent ;Published online January 23, 2026
- DOI: https://doi.org/10.5395/rde.2026.51.e6 [Epub ahead of print]
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Abstract
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ePub - Objectives
This study aimed to evaluate the influence of adjacent restorative material and interproximal distance on the accuracy of digital impressions of inlay cavities obtained using an intraoral scanner.
Methods
A disto-occlusal inlay cavity was prepared on a mandibular right first molar model, and digital scans were performed using a CEREC Primescan (Dentsply Sirona). The adjacent restorative materials used were Lava (3M ESPE), ENAMIC (VITA Zahnfabrik), Celtra Duo (Dentsply Sirona), and DMAX (DMAX INTERNATIONAL), and the interproximal distances were set to 0.6 mm, 0.8 mm, and 1.0 mm. The obtained scan data were analyzed using GOM Inspect software (GOM GmbH).
Results
Trueness, maximum positive and negative deviations, and precision were significantly influenced by both the adjacent restorative material and the interproximal distance, while their interaction showed a significant effect only on precision. Celtra Duo demonstrated the highest trueness, with mean deviation values decreasing from 7.8 μm at a 0.6 mm interproximal distance to 7.3 μm at 1.0 mm. ENAMIC showed the best precision, presenting mean deviations of 2.6 μm at 0.6 mm, 2.9 μm at 0.8 mm, and 2.4 μm at 1.0 mm. A narrow interproximal distance of 0.6 mm resulted in lower trueness, measured at 8.3 μm, and the highest precision deviation of 3.4 μm. In contrast, an interproximal distance of 1.0 mm yielded improved scan accuracy, with increased trueness and reduced precision variation.
Conclusions
Digital impression accuracy of inlay cavities was influenced by adjacent restorative material and interproximal distance, suggesting clinical consideration is needed in CAD/CAM workflows to optimize restoration fit.
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