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Marginal adaptation analysis of CAD/CAM resin crown with non-invasive methods
Chen Zeng1, Tomoko Tabata2, Rena Takahashi1
1Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8549, Japan.
Clinical Oral Investigations
|February 25, 2025
Summary
Swept-source optical coherence tomography (SS-OCT) accurately measures marginal adaptation in dental restorations at a 90° light incidence angle. This non-invasive technique offers a viable alternative to traditional methods for clinical use.
Area of Science:
- Dental Materials Science
- Biomedical Optics
- Clinical Dentistry
Background:
- Assessing the marginal adaptation of indirect dental restorations is crucial for their longevity and clinical success.
- Traditional methods like the silicone replica technique can be invasive and time-consuming.
- Advancements in optical imaging offer potential for non-invasive and precise evaluation.
Purpose of the Study:
- To compare the accuracy of swept-source optical coherence tomography (SS-OCT) with the silicone replica method for analyzing marginal adaptation.
- To investigate the influence of different light incidence angles (60°, 75°, 90°) of SS-OCT on measurement precision.
Main Methods:
- Fourteen crowns were fabricated for a mandibular first molar using CAD/CAM technology.
- Marginal adaptation was assessed using both the silicone replica method and SS-OCT at varying light incidence angles.
- Statistical analysis included two-way ANOVA and t-tests with Bonferroni correction.
Main Results:
- SS-OCT showed significantly larger marginal discrepancies than the silicone replica method at 60° and 75° incidence angles, particularly at the buccal and lingual aspects.
- At a 90° incidence angle, no significant differences in marginal discrepancy were found between SS-OCT and the silicone replica method.
- Marginal discrepancy measurements increased as the light incidence angle decreased from 90° to 60°.
Conclusions:
- Swept-source optical coherence tomography (SS-OCT) is a viable and accurate alternative to the silicone replica method for evaluating marginal adaptation when used at a 90° light incidence angle.
- The non-invasive nature of SS-OCT suggests its potential for in vivo clinical application in assessing the marginal fit of indirect dental restorations.
