A comparison of the fracture resistances of endodontically treated mandibular premolars restored with endocrowns and glass fiber post-core retained conventional crowns
Jing Guo, Zhiming Wang, Xuesheng Li, Chaoyang Sun, Erdong Gao, Hongbo Li,
소속 상세정보
( Jing Guo ) - Chinese PLA General Hospital Department of Stomatology
( Zhiming Wang ) - Chinese PLA General Hospital Department of Stomatology
( Xuesheng Li ) - Chinese PLA General Hospital Department of Stomatology
( Chaoyang Sun ) - University of Science and Technology Department of Mechanical Engineering
( Erdong Gao ) - the People’s Hospital of Cangzhou Department of Stomatology
( Hongbo Li ) - University Dental College & Hospital Department of Prosthodontics
KMID : 1023820160080060489
Abstract
PURPOSE : This in-vitro study aimed to evaluate the fracture resistances and failure modes of endodontically treated mandibular premolars restored with endocrowns and conventional post-core retained crowns.
MATERIALS AND METHODS : Thirty mandibular premolars were assigned into three groups (n=10): GI, intact teeth; GE, teeth with endocrowns; GC, teeth with conventional post-core supported crowns. Except for the teeth in group GI, all specimens were cut to 1.5 mm above the cementoenamel junction and endodontically treated. Both endocrowns and conventional crowns were fabricated from lithium-disilicate blocks using a CEREC 3D CAD/CAM unit. All specimens were subjected to thermocycling and then to 45° oblique compressive load until fracture occurred. The fracture resistance and failure mode of each specimen were recorded. Data were analyzed with one-way ANOVA and LSD Post Hoc Test (α=.05).
RESULTS : The fracture resistances of GE and GC were significantly lower than that of GI (P<.01), while no significant difference was found between GE and GC (P=.702). As of the failure mode, most of the specimens in GE and GC were unfavorable while a higher occurrence of favorable failure mode was presented in GI.
CONCLUSION : For the restoration of mandibular premolar, endocrown shows no advantage in fracture resistance when compared with the conventional method. Both of the two methods cannot rehabilitate endodontically treated teeth with the same fracture resistances that intact mandibular premolars have.
키워드
Endocrown; Mandibular premolar; Intact tooth; Fracture resistance; Failure mode
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