Fracture resistance of upper central incisors restored with different posts and cores
Dastjerdi Maryam Rezaei, Chaijan Kamran Amirian, Tavanafar Saeid,
소속 상세정보
( Dastjerdi Maryam Rezaei ) - Babol University of Medical Sciences Faculty of Dentistry Dental Material Research Center
( Chaijan Kamran Amirian ) - Babol University of Medical Sciences Faculty of Dentistry Dental Material Research Center
( Tavanafar Saeid ) - Babol University of Medical Sciences Faculty of Dentistry Department of Prosthodontics
KMID : 1034420150400030229
Abstract
Objectives: To determine and compare the fracture resistance of endodontically treated maxillary central incisors restored with different posts and cores.
Materials and Methods: Forty-eight upper central incisors were randomly divided into four groups: cast post and core (group 1), fiber-reinforced composite (FRC) post and composite core (group 2), composite post and core (group 3), and controls (group 4). Mesio-distal and bucco-lingual dimensions at 7 and 14 mm from the apex were compared to ensure standardization among the groups. Twelve teeth were prepared for crown restoration (group 4). Teeth in other groups were endodontically treated, decoronated at 14 mm from the apex, and prepared for posts and cores. Resin-based materials were used for cementation in groups 1 and 2. In group 3, composite was used directly to fill the post space and for core build-up. All samples were restored by standard metal crowns using glass ionomer cement, mounted at 135° vertical angle, subjected to thermomechanical aging, and then fractured using a universal testing machine. Kruskal-Wallis and Mann-Whitney U tests were used to analyze the data.
Results: Fracture resistance of the groups was as follows: Control (group 4) > cast post and core (group 1) > fiber post and composite core (group 2) > composite post and core (group 3). All samples in groups 2 and 3 fractured in restorable patterns, whereas most (58%) in group 1 were non-restorable.
Conclusions: Within the limitations of this study, FRC posts showed acceptable fracture resistance with favorable fracture patterns for reconstruction of upper central incisors.
키워드
Cast post and core; Fiber-reinforced composite; Fracture resistance; Thermo-mechanical aging
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