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Minimally invasive CAD/CAM lithium disilicate partial-coverage restorations show superior in-vitro fatigue
F A Spitznagel1,2, L S Prott1, J S Hoppe1
1Department of Prosthodontics, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University, Düsseldorf, Germany.
Summary
Minimally invasive partial-coverage restorations (PCRs) made with CAD/CAM lithium disilicate (LDS) show better performance than crowns. Thinner PCRs (0.5 and 1.0 mm) outperformed crowns, indicating their suitability for molar rehabilitation.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- CAD/CAM technology enables precise fabrication of dental restorations.
- Lithium disilicate (LDS) is a popular ceramic material for its aesthetics and strength.
- Evaluating restoration design and material thickness is crucial for clinical success.
Purpose of the Study:
- To compare the performance and failure loads of CAD/CAM-fabricated LDS partial-coverage restorations (PCRs) versus crowns on molars.
- To analyze the influence of ceramic layer thickness on restoration durability under fatigue.
Main Methods:
- Seventy-two monolithic LDS restorations (PCRs and crowns) with varying ceramic thicknesses were fabricated using CAD/CAM.
- Specimens underwent simulated chewing forces (thermomechanical loading) followed by load-to-failure testing.
- Failure analysis utilized light and scanning electron microscopy; data were statistically analyzed.
Main Results:
- Minimally invasive PCRs (0.5 and 1.0 mm thick) demonstrated significantly higher failure loads than crowns of identical thickness.
- Crowns with 0.5 mm thickness showed a higher incidence of cracks after fatigue compared to PCRs.
- PCRs exhibited a higher overall success rate (96.88%) compared to crowns (75%).
Conclusions:
- Minimally invasive monolithic LDS PCRs with 0.5 and 1.0 mm thickness offer superior failure load performance compared to crowns.
- Thinner monolithic crowns (0.5 mm) are susceptible to fatigue-induced cracking.
- Minimally invasive PCRs with non-retentive preparations are a viable alternative to crowns for molar restorations.
