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Effect of Obturating Systems, Dowel Materials, and Adhesive Luting Techniques on the Resistance to Fracture of Endodontically Treated Teeth
Author(s) -
Guindy Jylan El,
Fouda Manar Y.
Publication year - 2010
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/j.1532-849x.2010.00636.x
Subject(s) - dowel , materials science , adhesive , post and core , composite material , fracture (geology) , universal testing machine , dentistry , maxillary central incisor , crown (dentistry) , medicine , ultimate tensile strength , layer (electronics)
Purpose: The aim of this study was to assess the role of obturating systems, dowel materials, and adhesive techniques on the resistance to fracture of endodontically treated teeth. Material and Methods: Eighty maxillary central incisors were selected and randomly divided into two groups according to the obturating system (n = 40); group I: gutta‐percha and Roeko sealer; group II: RealSeal. Both groups were further subdivided into two subgroups; subgroup A: using ceramic dowels (Cosmopost); subgroup B using fiber dowels (Easy Post). Each subgroup was assigned to two divisions according to the adhesive luting technique; division V (total‐etch) Variolink II resin cement; division U (self‐adhesive) RelyX Unicem. Composite core build‐up was made using a core former. Each specimen was loaded 2 mm from its incisal edge on the palatal side at a 135° angle with the long axis of the tooth using a universal testing machine with a load cell of 5 KN at a crosshead speed of 0.5 mm/min until fracture. Failure loads were recorded in N. Scanning electron microscopic examination at the dentin/resin interface (1000x) was performed. Three‐way ANOVA was used to test the effect of obturating system, dowel material, adhesive technique, and their interactions (obturating system * dowel material, obturating system * adhesive, dowel material * adhesive, obturating system * dowel material * adhesive). Duncan's test was used for pairwise comparison. The significance level was set at p ≤ 0.05. Statistical analysis was performed with SPSS 16.0. Results : The mean resistance to fracture (617.4 N) was statistically significantly higher in the ceramic dowel with gutta‐percha and Variolink (GP/C/V) group than in the other groups. The RealSeal and RelyX fiber dowel group's mean resistance was the lowest and was significantly lower than the other groups. Conclusions : In this study, three factors played a part in enhancing the resistance to fracture of endodontically treated teeth. High resistance to fracture was achieved when ceramic dowels were luted with total‐etch technique in gutta‐percha‐obturated teeth.