COMPARATIVE ANALYSIS OF MARGINAL ADAPTATION AND MICROLEAKAGE IN CAD-CAM HYBRID-CERAMIC VERSUS INDIRECT COMPOSITE ONLAYS
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Keywords
Hybrid-ceramic onlay; indirect composite onlay; marginal adaptation; microleakage; CAD-CAM; thermocycling
Abstract
Marginal adaptation and microleakage are key factors that affect the long-term success of onlay restorations. CAD-CAM hybrid-ceramic materials may offer better fit and sealing compared with conventional indirect composites, but local evidence is limited.
Objective: To compare the marginal adaptation and microleakage of CAD-CAM hybrid-ceramic onlays with indirect composite onlays after thermocycling.
Materials and Methods: Eighty extracted mandibular molars were prepared using a standardized MOD cavity design. Teeth were randomly divided into two groups: hybrid-ceramic onlays (PICN blocks) and laboratory-processed indirect composite onlays. All restorations were cemented with dual-cure resin cement under standardized load. Specimens underwent 5,000 thermocycles (5°C–55°C). Marginal gaps were measured before and after aging using a digital stereomicroscope. Microleakage was assessed using methylene blue dye penetration on sectioned samples. Data were analyzed to compare both groups.
Results: Hybrid-ceramic onlays showed significantly smaller marginal gaps before aging (37–40 μm) than composite onlays (103–113 μm). After thermocycling, hybrid-ceramic margins remained within clinical limits (63–66 μm), while composites increased to 112–123 μm. Hybrid-ceramic onlays also showed lower microleakage (mean 11.6%) compared with composites (mean 21.7%).
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Rooba Azmatullah
FCPS post graduate resident, Operative Dentistry and Endodontics, Sardarbegum dental college gandhara university, BDS,
Saba Ajmeer khan
FCPS post graduate resident, Operative Dentistry and Endodontics, Sardarbegum dental college gandhara university, BDS,
Dr. Fozia Bari
BDS and Diploma in Clinical Dentistry(Operative Dentistry), Root Canal Specialist, Hameed Awan and Associates Peshawar,
Ambreen Azam
Assistant professor, Dental Materials, Margalla Institute of health sciences, BDS (Pak), MSc (UK),
Yasir Hussain
Lecturer, Prosthodontics, Niazi Medical and Dental College, Sargodha, BDS,
Kinza Manzoor
Assistant Professor, Dental Materials, Watim Dental college Rawat, M. Phil Dental Materials,
