The Influence of Cavity Design and Glass Fiber Posts on Biomechanical Behavior of Endodontically Treated Premolars

Soares, Carlos José; Soares, Paulo Vinícius; Santos-Filho, Paulo César Freitas; Castro, Cleudson; Magalhães, Denildo de; Versluis, Antheunis

doi:10.1016/j.joen.2008.05.017

Cited by 89 publications

(93 citation statements)

References 29 publications

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“…In regard to the fracture patterns, it was observed that they were less damaging when located in the filling core or in the cervical one-third of the root; in either case, a new restorative procedure can be performed to maintain the tooth root. This is contrary to what was observed in the teeth restored with cast metal cores, in which the pattern is more destructive and often located longitudinally in the root, leading to loss of the tooth 19 . Ceballos et al 26 also indicated the use of dual resin cements for cementation of intraradicular posts, since they have been shown to promote the dissipation of stresses and reduce the risk of irreversible root fractures.…”

Section: Discussioncontrasting

confidence: 92%

“…Premolar teeth were used to simulate a clinical condition; the incidence of masticatory forces in premolars occurs in a more parallel manner along the long axis of the tooth 19 . This is different from studies conducted with incisors, in which the force is tangential to the tooth 13,20,21 .…”

Section: Discussionmentioning

confidence: 99%

“…A thicker layer of cementing agent could be subject to greater solubility in the oral cavity and to fatigue. Therefore, the use of resin composites (in the post relining technique) and fiber glass accessory posts (cemented with the main glass fiber post) may be alternatives for filling the root canal 9,11,19 , minimizing the quantity of cement to be used.…”

Section: Discussionmentioning

confidence: 99%

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Fracture resistance of weakened human premolar roots after use of a glass fiber post together with accessory posts

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Amaral

França

et al. 2014

Rev. odontol. UNESP

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ResumoObjetivo: Avaliar a resistência à fratura de pré-molares com canais alargados restaurados com pinos de fibra de vidro e cimento resinoso com diferentes quantidades de pinos acessórios. Material e método: Trinta e seis pré-molares receberam preparos padronizados que simularam raízes fragilizadas e foram separados em três grupos (n=12): G0 -pino de fibra de vidro (Reforpost/Angelus) cimentado com cimento resinoso dual (Rely X ARC/3M ESPE); G1 -pino de fibra de vidro e um pino acessório (Reforpin/Angelus) cimentados com cimento resinoso dual; G2 -pino de fibra de vidro e dois pinos acessórios cimentados com cimento resinoso dual. Núcleos de preenchimento em resina composta foram confeccionados para cada dente. Um coping metálico foi posicionado de forma padronizada sobre o núcleo de preenchimento para a realização dos ensaios de resistência à fratura em máquina de ensaios. Os testes foram realizados com aplicação de força paralela ao longo eixo do dente com velocidade de 0,5 mm/min. O modo de fratura foi avaliado com lupa estereoscópica em escores. Resultado: Análise de Variância (ANOVA) foi aplicada e mostrou não haver diferenças significativas nos valores de resistência à fratura entre os grupos (em kgf): G0 = 91,1 ± 56,9; G1 = 104,7 ± 66,6; G2 = 106,1 ± 51,9. Maior frequência de fraturas ou trincas foram observadas no terço cervical das raízes na ausência de pinos acessórios, mas não houve diferenças significativas entre os modos de fraturas entre os grupos. Conclusão: A quantidade de pinos acessórios cimentados em raízes fragilizadas não influenciou a resistência à fratura ou modo de falha das raízes de pré-molares.Descritores: Técnica para retentor intrarradicular; cimentos de resina; raiz dentária. AbstractObjective: To evaluate the fracture strength of human premolar teeth with wide root canals, restored with glass fiber posts and resin cement, together with different numbers of accessory posts. Material and method: Thirty-six premolars received standardized preparations that simulated weakened roots, and were divided into three groups (n=12): G0 -glass fiber post (Reforpost/Angelus) cementation with dual cure resin cement (Rely X ARC/3M ESPE); G1 -glass fiber post cementation and one accessory post (Reforpin/Angelus), with dual cure resin cement; G2 -glass fiber post cementation and two accessory posts, with dual cure resin cement. Resin composite cores were placed in each tooth. A metal coping was placed in a standardized position on the cores to perform the compressive tests using a test machine. Testing was performed applying a force parallel to the long axis of the teeth at a speed of 0.5 mm/min. Fracture mode was analyzed under a stereoscopic loupe, classified by scores. Result: the Analysis of Variance (ANOVA) was applied, and there was no statistical difference in the mean values of fracture strength among the groups (in kgf): G0 = 91.1 ± 56.9; G1 = 104.7 ± 66.6; G2 = 106.1 ± 51.9. Greater frequency of fracture or cracks was observed in the cervical one-third of the root in the teeth without ce...

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Section: Discussioncontrasting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Fracture resistance of weakened human premolar roots after use of a glass fiber post together with accessory posts

Segato

Amaral

França

et al. 2014

Rev. odontol. UNESP

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“…This analysis allows the evaluation of different factors in the same model by avoiding change to the original digital image. 18,22,23 The aim of this study was to evaluate the effect of stress in NCCL morphology in a premolar, submitted to three different occlusal loadings, as well as their restored status in the biomechanical behaviour of premolars using 3D finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Loading and composite restoration assessment of various non‐carious cervical lesions morphologies – 3D finite element analysis

Soares

Machado

Zeola

et al. 2015

Australian Dental Journal

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Background: The present study analysed the effects of different occlusal loading on premolars displaying various non-carious cervical lesions morphologies, restored (or not) with composites, by 3D finite element analysis. Methods: A three-dimensional digital model of a maxillary premolar was generated using CAD software. Three noncarious cervical lesions morphological types were simulated: wedged-shaped, saucer and mixed. All virtual models underwent three loading types (100 N): vertical, buccal and palatal loading. The simulated non-carious cervical lesions morphologies were analysed with and without restorations to consider specific regions, such as the occlusal and gingival walls as well as the depth of the lesions. Data summarizing the stress distribution were obtained in MPa using Maximum Principal Stress. Results: Palatal loads were responsible for providing the highest values of accumulated tensile stress on the buccal wall; 27.66 MPa and 25.76 MPa for mixed and wedged-shaped morphologies, respectively. The highest tensile values found on non-carious cervical lesions morphologies restored with composite resin were 5.9 MPa in the mixed morphology, similar to those found on sound models despite their morphologies and occlusal loading. Conclusions: The various non-carious cervical lesions morphologies had little effect on stress distribution patterns, whereas the loading type and presence of composite restorations influenced the biomechanical behaviour of the maxillary premolars.

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“…It has been reported that the loss of dental structure and the presence of fiber post restoration reduced the fracture resistance and tend to create a higher stress concentrations in the tooth-restoration complex [38]. However, another study has reported that the fracture resistance of endo-treated mandibular molars restored using resin composite was not affected by the presence or absence of glass fiber post [5].…”

Section: Discussionmentioning

confidence: 99%

Effect of restorative techniques on fracture resistance of endodontically treated premolars

Al-Makramani¹,

Razak²,

Yi³

et al. 2013

OJST

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The Influence of Cavity Design and Glass Fiber Posts on Biomechanical Behavior of Endodontically Treated Premolars

Cited by 89 publications

References 29 publications

Fracture resistance of weakened human premolar roots after use of a glass fiber post together with accessory posts

Fracture resistance of weakened human premolar roots after use of a glass fiber post together with accessory posts

Loading and composite restoration assessment of various non‐carious cervical lesions morphologies – 3D finite element analysis

Effect of restorative techniques on fracture resistance of endodontically treated premolars

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