OBJECTIVES: To evaluate the @entity174 strength and the mode of failure of endodontically treated molars restored with CAD/ @entity5380 overlays with fiber reinforced composite build-up of the pulp chamber. METHODS: 40 Devitalized molars were cut over the CEJ and divided into five groups (n=8). The pulp chamber area was filled with: group 0 (control), no resin build-up; group 1, hybrid composite build-up (G-aenial posterior, GC); group 2, as in group 1 but covered with 3 nets of bi-directional E-glass fibers (EverStickNET, Stick Tech Ltd.); group 3, a FRC resin (EverX posterior, GC); group 4, as in group 3 but covered by the bi-directional fibers. The crowns were restored with CAD- @entity5380 composite restorations (Lava Ultimate, 3M ESPE). Maximum @entity174 loads were recorded in Newton and data were analyzed using Kruskal-Wallis test (p<0.05). Fragments were analyzed using SEM. RESULTS: The mean static loads in Newton were: group 0: 2448 (546); group 1: 2817 (873); group 2: 2128 (952); group 3: 2429 (1091); group 4: 2577 (833). No significant differences were found between the groups (p>0.05). All specimens fractured in a catastrophic way, under the CEJ. The main crack evolved in the corono-apical direction. In groups 2 and 4 secondary @entity174 paths with apico-coronal direction were detected close to the bi-directional fibers' layer. CONCLUSIONS: For the restoration of endodontically treated molars, the incorporation of FRCs did not influence the load-bearing capacity of the tooth-restoration complex. The SEM analysis showed a low ability of the bi-directional fibers net in deviating the @entity174 but this effect was not sufficient to lead more favorable @entity174 patterns, over the CEJ. CLINICAL SIGNIFICANCE: The use of FRCs to reinforce the "core" of devitalized molars against vertical @entity174 under static loads seems useless when the thickness of the CAD/ @entity5380 composite overlay restoration is high.

The effect of a fiber reinforced cavity configuration on load bearing capacity and failure mode of endodontically treated molars restored with CAD/ XXXX resin composite overlay restorations.

@entity5380 :: ('MESH:D020786', 'Disease') :: ['CAM'] @entity174 :: ('MESH:D050723', 'Disease') :: ['fracture', 'fractures']
@entity5380 :: (MESH:D020786,Disease) :: ['CAM']
