Paper Information

Journal:   IRANIAN ENDODONTIC JOURNAL (IEJ)   2014 , Volume 9 , Number 3; Page(s) 215 To 219.
 
Paper: 

THE INFLUENCE OF COMPOSITE THICKNESS WITH OR WITHOUT FIBERS ON FRACTURE RESISTANCE OF DIRECT RESTORATIONS IN ENDODONTICALLY TREATED TEETH

 
 
Author(s):  TORABZADEH HASSAN, GHASEMI AMIR*, SANEI MASOUD, RAZMAVAR SARA, SHEIKH AL ESLAMIAN SEYEDEH MAHSA
 
* 5TH FLOOR, DENTAL RESEARCH CENTER, RESEARCH INSTITUTE OF DENTAL SCIENCES, DENTAL SCHOOL, SHAHID BEHESHTI UNIVERSITY OF MEDICAL SCIENCES, EVIN, TEHRAN, IRAN, 1983963113
 
Abstract: 

Introduction: This in vitro study evaluated the influence of composite thickness (with or without fiber reinforcement) on fracture resistance of direct restorations in endodontically treated teeth.
Methods and Materials: Fifty-six intact human premolars were chosen and randomly divided into four groups (n=14). After preparation of a mesio-occluso-distal (MOD) cavities and cusp reduction, the teeth were endodontically treated. Subsequently, the samples were restored with composite resin using the following protocols: group 1; composite onlay with cusp coverage of 1.5 mm, group 2; composite onlay with cusp coverage of 2.5 mm, group 3; composite onlay (including resin-impregnated fiber) with cusp coverage of 1.5 mm and group 4; composite onlay (including resin-impregnated fiber) with cusp coverage of 2.5 mm. The fracture resistance of teeth in all test groups was calculated by subjecting them to a progressively increasing compressive axial force in the universal testing machine with the cross-head speed of 1 mm/min to the point of fracture. The data were analyzed using the Kruskal-Wallis test.
Results: The mean fracture strengths and obtained standard error were 1263.85±74.03 N, 1330.26±128.01 N, 1344.92±64.40 N and 1312.54±75.63 N for groups 1 to 4, respectively. Statistical analysis revealed no significant difference between groups.
Conclusion: Cusp coverage of 1.5 and 2.5 mm in MOD access cavities with or without insertion of resin impregnated fiber had similar fracture rates in the endodontically treated teeth.

 
Keyword(s): COMPOSITE RESINS, CUSP COVERAGE, CUSP REDUCTION, DENTAL RESTORATION, DIRECT RESTORATION, ENDODONTICALLY-TREATED TEETH, FIBER, STRESS FRACTURES, RESIN COMPOSITE
 
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