Evaluation of fracture resistance of endodontically treated teeth restored with prefabricated posts and composites with varying quantities of remaining coronal tooth structure

Melo, Murilo Pereira de; Valle, Accácio Lins do; Pereira, Jefferson Ricardo; Bonachela, Wellington Cardoso; Pegoraro, Luiz Fernando; Bonfante, Gérson

doi:10.1590/s1678-77572005000200009

Cited by 29 publications

(24 citation statements)

References 23 publications

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“…The flowable composite resin presents reduced content of fillers and viscosity, with a high runoff (24), which contributes to its infiltration into dentin. The microhybrid composite resin used in this study has a high amount of crosslinking in chemical structure that increases the modulus of elasticity and enhances the mechanical strength (12). For both composite resins, polymerization shrinkage in the adhesive interface was reduced by the incremental restoration technique.…”

Section: Discussionmentioning

confidence: 99%

“…Besides the ability to adhere to tooth structure by means of adhesive systems, microhybrid composite resins exhibit satisfactory mechanical properties (12) and the flowable composite resins have greater flow and dissipation of tensions (13). The resin-modified glass-ionomer cements (RMGIC) combine the properties of conventional GICs, such as chemical adhesion to dental tissues and linear thermal expansion coefficient similar to the tooth and the mechanical properties of resins.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Intracoronal Dentin Treatment Prior to Bleaching on Bond Strength of Restorative Materials

et al. 2014

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Surface treatment of dentin before the bleaching procedure may affect its permeability and influence the bond strength of restorative materials. This study evaluated the influence of surface treatment before the bleaching on shear bond strength (SBT) of restorative materials to intracoronal dentin. Dentin slabs were subjected to surface treatment: no bleaching (control -CON), no surface treatment + bleaching (HP), 37% phosphoric acid + bleaching (PA) and Er:YAG laser + bleaching (L). After the bleaching procedure, specimens (n=10) were restored with: microhybrid composite resin (MH), flowable composite resin (F), and resin-modified glass-ionomer cement (RMGIC). The shear test was carried out. ANOVA and Tukey's test (α=0.05) showed significant difference for surface treatment and restorative materials (p<0.05). CON presented higher STB and was statistically different from HP (p<0.05). PA and L showed intermediate values and were statistically similar to CON and HP (p>0.05). STB for MH and F were higher than RMGIC (p<0.05), and did not differ from each other (p>0.05). The surface treatments with phosphoric acid and Er:YAG laser before the bleaching procedure provided shear bond strength at the same level of unbleached dentin and the composite resins presented superior bond strength to the intracoronal dentin.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of Intracoronal Dentin Treatment Prior to Bleaching on Bond Strength of Restorative Materials

et al. 2014

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“…A cylindrical device with tapered tip was used in order to improve the specimens adaptation to the assay apparatus. 19 This cylindrical design allowed specimens to be fixed at a 45° angle, and the load was applied to the buccal surface of the teeth at a 135° angle in relation to the long axis of the root (3.0 mm from the incisal portion).…”

Section: Crown Fracture Resistance Evaluationmentioning

confidence: 99%

Influence of the Number of Bleaching Sessions on Fracture Resistance and Dentin Microhardness of Endodontically Treated Teeth

Garrido¹,

Kuga²,

Kalatzis-Sousa³

et al. 2017

World Journal of Dentistry

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Objectives:To evaluate the effects of number of bleaching sessions on fracture resistance and dentin microhardness in endodontically treated teeth using 15% hydrogen peroxide with titanium dioxide nanoparticles (15HPTiO 2 ) associated to light emitting diode (LED)-laser system. Materials and methods:Forty human incisors were endodontically treated and divided according to the number of bleaching sessions (n = 10, each group): G1 -no treatment G2 -one; G3 -two; and G4 -three sessions. The 15HPTiO 2 was applied within the pulp chamber and on the buccal surface, then photoactivated using LED-laser. All experimental specimens were restored with ionomer glass cement between each session and in the final treatment. Specimens were then subjected to the fracture resistance test (kN), using an electromechanical machine. To the dentin microhardness evaluation, 40 crown extracted endodontically treated human teeth were longitudinally sectioned, divided into groups as previously described (n = 10), and submitted to similar bleaching protocol. Dentin microhardness was evaluated before and after the final dental bleaching session in each group using Knoop indentator. Data were analyzed by analysis of variance (ANOVA) and Tukey tests (p = 0.05). Results:The fracture resistance values were similar among all groups (p > 0.05). The number of dental bleaching sessions had a negative influence on the microhardness dentin, because G4 > G3 > G2 > G1 (p < 0.05). Conclusion:The number of bleaching sessions using 15% hydrogen peroxide with titanium dioxide nanoparticles associated to LED-laser system had no influence on the fracture resistance of the endodontically treated teeth crowns, but promoted a reduction in dentin microhardness.

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“…Each specimen was positioned into a cylindrical device as described by Melo et al 2005 29 and Bortoluzzi et al 2007, 15 which enables an angle of 135º in relation to the long axis of the tooth. The obtained data of fracture strength were statistically evaluated by using one-way analysis of variance (1-way ANOVA), and the Tukey test (α = 0.05).…”

Section: Fracture Strength Testmentioning

confidence: 99%

Resistance of Teeth with Simulated Incomplete Rhizogenesis with Intraradicular Post or Root Canal Filling

Tanomaru‐Filho

Sivieri-Araújo²,

Guerreiro-Tanomaru

et al. 2014

The Journal of Contemporary Dental Practice

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Aim: The aim of this study was to evaluate the fracture strength (FS) of bovine incisors with simulated incomplete rhizogenesis (IR) after different intraradicular treatments. Materials and methods:Incomplete rhizogenesis was simulated by sectioning the crowns and roots of 40 bovine incisors. Root canal preparation was performed and the samples divided into 4 groups (n = 10): GI-negative control with intra-radicular preparation; GII-positive control without intra-radicular preparation; GIII-glass fiber post cemented with resin cement and GIVroot canal obturation with Epiphany/Resilon system. In GIII and GIV, 4.0 mm apical plugs of mineral trioxide aggregate (MTA) were done. The samples were embedded into cylinders with polystyrene resin, and the periodontal ligament was simulated with a medium-viscosity polyether-based impression material (Impregum Soft). The specimens were submitted to compressive fracture strength test (0.5 mm/min at 135º in relation to the long axis of the tooth) in a mechanical testing machine MTS 810. Data were submitted to ANOVA and Tukey's test (α = 0.05).Results: GIII produced the highest FS values (p < 0.05). GI and GIV showed similar FS results (p > 0.05) but smaller than GII (p < 0.05). Conclusion:Glass fiber intraradicular posts provided the FS increase of teeth with simulated incomplete rhizogenesis. Epiphany/Resilon root canal filling with MTA plug did not provide the increase of the fracture strength to teeth with simulated incomplete rhizogenesis. Clinical significance:The fiber post reinforces the root structure of teeth with incomplete rhizogenesis.

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Evaluation of fracture resistance of endodontically treated teeth restored with prefabricated posts and composites with varying quantities of remaining coronal tooth structure

Abstract: The remaining coronal tooth structure did not influence the resistance of endodontically treated teeth; however, the change of core build-up was able to modify this resistence.

Cited by 29 publications

References 23 publications

Impact of Intracoronal Dentin Treatment Prior to Bleaching on Bond Strength of Restorative Materials

Impact of Intracoronal Dentin Treatment Prior to Bleaching on Bond Strength of Restorative Materials

Influence of the Number of Bleaching Sessions on Fracture Resistance and Dentin Microhardness of Endodontically Treated Teeth

Resistance of Teeth with Simulated Incomplete Rhizogenesis with Intraradicular Post or Root Canal Filling

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