All ETDs from UAB

Advisory Committee Chair

Permg-Ru Liu

Advisory Committee Members

Milton Essig

Dan Givan

Firoz Rahemtulla

Lance Ramp

Document Type


Date of Award


Degree Name by School

Master of Science (MS) School of Dentistry


Cuspal failures of MOD (mesial-occlusal-distal) restored teeth have been constantly observed in clinic especially those restored with amalgam. As the pulpal depth and isthmus width of the preparation increases, the strength decreases. A number of studies have investigated the adhesive technique which is intended to increase the fracture resistance by bonding the tooth structure. The results of the studies are controversial because of the differences of research design among studies. The purpose of this study is to evaluate the fracture resistance of the human maxillary first premolar restored with condensable composite (Surefil, Dentsply) and CEREC 3D ProCAD leucite-reinforced ceramic inlays with a variety of MOD cavity preparations with different pulpal depths and isthmus widths. METHODS: Ninety, freshly extracted intact maxillary first premolars were selected and divided into 9 groups, consisting of 10 premolars each. The teeth were prepared with a high speed handpiece to create different widths and depths of the MOD cavities. Subsequently, the ii teeth were restored with condensable composite resin or ceramic inlays. The specimens were then subjected to a compressive axial loading in a Universal testing machine at 0.5mm/minute by means of a steel ball, 4.82mm in diameter. All pressures were against only tooth structure, and the special head did not contact any restorative material. The final result was analyzed with Two-way ANOVA and Tukey post-hoc testing RESULTS AND CONCLUSIONS: 1. A bonded ceramic restoration restores a tooth to the same fracture resistance as a natural tooth. A ceramic inlay restored tooth has significantly higher cuspal fracture resistance as compared to a composite restored tooth. (P = 0.0007). 2. Mean fracture resistance of teeth restored with Surefil and a 3mm cavity width was higher than groups with a 2mm cavity width due to the dramatic transition of the outline form between the occlusal aspect and proximal boxes. 3. Cavity pulpal floor depth is not a significant factor of cuspal fracture resistance in a tooth restored with either a ceramic inlay or composite resin.

Included in

Dentistry Commons



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