STATEMENT OF PROBLEM: Fractures of endodontically treated @entity4500 have been attributed to weakened tooth structure caused by root canal enlargement and post preparation. PURPOSE: The purpose of this in  vitro study was to evaluate the @entity174 resistance of roots filled with either gutta percha, composite resin (LuxaCore Dual), or @entity4799 -based cement ( @entity4800 ). MATERIAL AND METHODS: One hundred twenty freshly extracted, @entity1 , permanent @entity1347 were sorted by type and assigned to 1 of 4 groups (n=30). The @entity4500 in group NT were not endodontically treated and served as the control. The @entity4500 in groups GP, LC, and, BD were accessed and instrumented to size 40/06. In group GP, the root canals were completely filled with gutta percha. In groups LC and BD, only the apical 5-mm portion of the root canals was filled with gutta percha, and the remaining portion of the root canals was filled with (LuxaCore Dual) in group LC and with ( @entity4800 ) in group BD. @entity174 resistance (kN) was assessed at the middle portion of each root, using a 3-point bending test with a universal testing machine exerting a compressive load on a loading pin at a crosshead speed of 0.5 mm/min until @entity174 occurred. One-way ANOVA was used to compare the mean root @entity174 resistance among the 4 groups (a=.05). RESULTS: The mean    SD @entity174 loads were 2.13   0.53 kN for group NT, 1.97    0.60 kN for group GP, 2.18   0.71 kN for group LC, and 2.22   0.54 kN for group BD. No statistically significant differences were found among the 4 groups (P>.05). CONCLUSIONS: The roots of endodontically treated maxillary anterior permanent incisors filled with gutta percha, @entity4800 , or LuxaCore Dual had resistance to @entity174 similar to that of @entity4500 that were not endodontically treated.

Evaluation of a @entity4799 -based cement as a root reinforcement material for endodontically treated XXXX .

@entity1 :: ('9606', 'Species') :: ['human'] @entity174 :: ('MESH:D050723', 'Disease') :: ['Fracture', 'fracture'] @entity1347 :: ('MESH:C537775', 'Disease') :: ['maxillary anterior teeth'] @entity4800 :: ('MESH:C506393', 'Chemical') :: ['Biodentine'] @entity4500 :: ('MESH:D014071', 'Disease') :: ['teeth'] @entity4799 :: ('MESH:C031293', 'Chemical') :: ['calcium silicate']
@entity1347 :: (MESH:C537775,Disease) :: ['maxillary anterior teeth']
