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Framework's marginal adaptation evaluation of fixed partial denture using conventional and digital impression
Ingrid C C Souto1, Otavio M Dos Santos Neto1, Livia Florin1
1Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirao Preto, University of São Paulo (USP), Ribeirao Preto, SP, Brazil.
American Journal of Dentistry
|September 25, 2024
Summary
Conventional impressions showed higher misfit in zirconia frameworks for fixed partial dentures compared to digital intraoral scans. However, both methods produced clinically acceptable results after ceramic thermal cycling.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Digital Dentistry
Background:
- Accurate marginal and internal fit of zirconia frameworks is crucial for fixed partial denture success.
- Digital impression techniques offer potential advantages over conventional methods in terms of accuracy and efficiency.
Purpose of the Study:
- To compare the marginal and internal misfit of zirconia frameworks for fixed partial dentures fabricated from conventional impressions versus intraoral scans.
- To evaluate the impact of ceramic thermal cycling on framework misfit.
Main Methods:
- Three-unit fixed partial denture frameworks were fabricated using zirconia.
- Conventional impressions (Group CI) and intraoral scans (Group DI) were used to create the frameworks.
- Framework misfit was measured before and after simulated ceramic thermal cycling using the replica technique and optical microscopy.
Main Results:
- No significant differences in axial misfit were observed between the groups.
- Conventional impressions (Group CI) exhibited significantly higher occlusal, vertical, horizontal, and absolute misfit compared to intraoral scans (Group DI).
- Absolute misfit increased after thermal cycling, but overall misfit values remained clinically acceptable for both techniques.
Conclusions:
- Intraoral scanning demonstrates superior accuracy for marginal and internal fit of zirconia frameworks compared to conventional impressions.
- Digital impression techniques are reliable for fabricating fixed partial dentures with acceptable fit, supporting their integration into clinical practice.
