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Repair Bond Strength of Milled and 3D-Printed CAD/CAM Hybrid Materials Using Different Repair Protocols: An In Vitro
Marko Milicevic1, Florian Beuer1, Nico Henning1
1Department of Prosthodontics, Geriatric Dentistry and Craniomandibular Disorders, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.
The repair protocol and material type significantly impact computer-aided design/computer-aided manufacturing (CAD/CAM) hybrid material bond strength. Thermocycling reduced milled material strength, but improved 3D-printed material bond strength with specific protocols.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Computer-aided design/computer-aided manufacturing (CAD/CAM) hybrid materials offer advanced restorative solutions.
- Evaluating the bond strength of these materials, especially after repair and thermocycling, is crucial for clinical longevity.
- Different repair protocols may influence the mechanical integrity of CAD/CAM restorations.
Purpose of the Study:
- To assess the shear bond strength of milled and 3D-printed CAD/CAM hybrid materials using various repair systems.
- To investigate the effect of thermocycling on the bond strength of these materials and repair protocols.
- To compare the efficacy of different repair protocols for CAD/CAM hybrid materials.
Main Methods:
- Two milled and one 3D-printed hybrid material were tested with three repair systems.
- Specimens underwent either thermocycling (30,000 cycles, 5°C-55°C) or storage in distilled water (37°C).
- Shear bond strength was measured using a universal testing machine, with fracture modes analyzed microscopically.
Main Results:
- Material type and repair protocol significantly affected shear bond strength.
- The MO repair protocol demonstrated the highest bond strength across all materials, both before and after thermocycling.
- Thermocycling decreased bond strength in milled materials but increased it in the 3D-printed material with the GC repair kit.
Conclusions:
- The selection of CAD/CAM material and repair protocol critically influences bond strength.
- Thermocycling negatively impacts the bond strength of milled CAD/CAM materials.
- The 3D-printed material exhibited enhanced bond strength under specific repair conditions after thermocycling, highlighting its potential clinical advantages.
