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Fracture resistance of lower molars with Class 1 composite and amalgam restorations
Affiliation:1. Restorative Dentistry Department, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia;2. School of Dentistry, Alfarabi Private College, Jeddah, Saudi Arabia;3. Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan;4. Department of Restorative Dentistry, University of Washington School of Dentistry, Box 357456, 1959 NE Pacific Street, Seattle, WA 98195-7456, USA;5. Dental Public Health, Faculty of Dentistry, King Abdulaziz University, P.O. Box 80209, Jeddah 215-89, Saudi Arabia;1. Lecturer, Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China;2. Lecturer, Department of Ultrasound, Guangzhou Women and Children’s Medical Center, Guangzhou, China;3. Lecturer, Department of Stomatology, Wuxi No. 2 People’s Hospital, Wuxi, China;4. Professor, Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China;5. Professor, Department of Stomatology, People’s Liberation Army General Hospital, Beijing, China;1. Tuscan School of Dental Medicine, University of Florence and Siena, Siena, Italy;2. Advanced Materials Lab, Department of Architecture and Industrial Design, Second University of Naples, Naples, Italy;3. Calabrodental Clinic, Tecnologica Research Institute, Crotone, Italy;4. Department of Oral Sciences, University “Federico II”, Naples, Italy;5. Oral Basic and Clinical Sciences, Faculty of Dentistry, King Abdul Aziz University, Jeddah, Saudi Arabia
Abstract:Groups of lower molars with medium Class 1 cavities were restored with amalgam and hybrid composite resins and subjected to centric and eccentric loads on the occlusal surfaces via steel spheres. Sound teeth and teeth with prepared but unrestored cavities were also studied for comparison. Teeth loaded under ‘eccentric’ conditions via large steel spheres sustained higher fracture loads than did corresponding specimens subject to centric loading. Under the eccentric loading mode hybrid composite materials restored the teeth to the strength level of sound teeth. One of these materials (Occlusin) strengthened the teeth to a significantly greater extent than did amalgam.
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