Evaluation of fracture resistance of teeth restored with three types of tooth colored onlay

Alavi, AliAsghar and Zahedi, Somayeh (2006) Evaluation of fracture resistance of teeth restored with three types of tooth colored onlay. Journal of Mashhad Dental School, 30 (Issue). pp. 289-300.

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Introduction: Regarding to esthetic needs of the patients and the demand for tooth colored restoration, this study evaluated the compressive fracture resistance of cuspal coverage of the maxillary premoalrs with tow types of indirect composites (Tetric Ceram HB, Targis) and one type of porcelain (IPS Empress). Materials & Methods: 32 extracted maxillary premolars were collected and were allocated in to four groups of eight teeth. The MOD cavities were prepared with following dimensions; Buccolingual width: 2/3 of cuspal tips distance, pulpal depth: 2.5mm, axial depth: 2mm, gingival floor 1mm above CEJ and 2mm reduction of cusp. One group were kept sound as control. The prepared teeth were restored with the above mentioned materials according to the manufacture’s instruction, and then they were stored in normal saline for 7-10 days. All teeth were loaded occlusally using universal-testing machine to the point of fracture. Data were anulysed by ANOVA test. Also the types fracture of teeth were compared. Results: The fracture resistance values for all of the groups were equivalent to those obtained for the unresorted control teeth, and according to the ANOVA test, no difference were detected between fracture resistances of resorted groups (P=0.7). The mode of fracture of teeth resorted with composite onlays when subjected to compressive loading were less catastrophic than that of teeth resorted with porcelain onlays. Conclusion: Cuspal coverage of extensively weakened teeth with composites or ceramics onlays can improve fracture resistance comparable to intact teeth. Key words: Fracture resistance, tooth colored materials, onlay.

Item Type: Article
Subjects: WU Dentistry. Oral surgery
Divisions: Journals > Journal of Mashhad Dental School
Depositing User: jmds jmds
Date Deposited: 24 Sep 2017 16:05
Last Modified: 24 Sep 2017 16:05
URI: http://eprints.mums.ac.ir/id/eprint/3606

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