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Ceramic Inlay Bonded Interfaces in Minimally Invasive Preparations: Damage and Contributing Mechanisms in Sliding
1Ping Yu, PhD, DDS, State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China.
Operative Dentistry
|November 29, 2021
Summary
Minimally invasive cavity preparations with 120° and 75° marginal angles can cause early damage to ceramic inlay bonded interfaces. However, their long-term wear behavior is comparable to conventional 90° preparations.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Cavity preparation design impacts bonded interface integrity.
- Conventional and minimally invasive approaches present different long-term outcomes.
Purpose of the Study:
- Evaluate damage to ceramic inlay bonded interfaces from minimally invasive cavity preparations.
- Investigate mechanisms contributing to interface damage.
Main Methods:
- Prepared tooth blocks with 90°, 120°, and 75° marginal angles.
- Bonded monolithic ceramic (IPS e.max CAD) inlays.
- Assessed Vickers indentations and crack lengths.
- Performed reciprocating wear tests under a 20N load.
Main Results:
- 120° group showed longer ceramic cracks; 75° group had larger enamel indentations.
- 120° group experienced greatest wear; 75° group showed increased early enamel wear.
- No significant wear differences observed at later stages.
Conclusions:
- Minimally invasive preparations (120°, 75°) can cause early ceramic inlay interface damage.
- Long-term wear behavior is comparable to conventional (90°) preparations.
- Marginal angle significantly influences initial damage patterns.
