Effect of incomplete crown ferrules on load capacity of endodontically treated maxillary incisors restored with fiber posts, composite build-ups, and all-ceramic crowns: An<i>in vitro</i>evaluation after chewing simulation

Naumann, Michael; Preuß, Anja; Rosentritt, Martin

doi:10.1080/00016350500331120

Cited by 86 publications

(84 citation statements)

References 18 publications

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“…32 The maximum load capability at the stage of final crown restoration is in a range comparable to that found in previous studies. 33,34 The fracture patterns in the crown-restored groups 3 and 4 correspond to patterns found earlier. 24 There was no post fracture observed, although an unusual number of crown losses in group 4 was apparent.…”

Section: Discussionmentioning

confidence: 85%

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Sterzenbach¹,

Rosentritt²,

Frankenberger³

et al. 2012

Operative Dentistry

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SUMMARY Objective The load capability of post-restored endodontically treated teeth (ETT) can be determined at different restorative stages. It was the aim of this study to compare the load capability of ETT at these stages. Materials and Methods Maxillary central incisors were divided into 4 groups (n=10) and endodontically treated. Specimens were restored with: (I) only glass fiber posts (GFP); (II) GFP and composite build-up with 2 mm ferrule; (III and IV) with additional adhesively luted all-ceramic crowns. Group (I) to (III) were statically loaded, and group (IV) was exposed to thermomechanical loading (TML) and subsequent static loading. Results The lowest median load level of 73 N was determined for group (I). The maximum median load value of 331 N was found for group (III). The comparison of Fmax [N] of group (I), (II) and (III) revealed significant differences between the groups (p<0.001). The specimens of group (IV) failed at significantly lower load values (p<0.005) as similarly restored specimens of group (III) which were only statically loaded. The stage of restoration and TML loading prior to static loading had a significant impact on fracture patterns (p=0.006). Conclusion Every additional restorative step torwards a final crown-restored ETT significantly increased the load capability. TML prior to load-to-fracture testing of the complete restorative complex, ie. post, core and crown, significantly decreased maximum load capability.

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Section: Discussionmentioning

confidence: 85%

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Sterzenbach¹,

Rosentritt²,

Frankenberger³

et al. 2012

Operative Dentistry

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“…Esse resultado pode ser relacionado com o fato de a matriz resinosa TEGDMA ter um baixo peso molecular, ou seja, menos fl exível, acarretando em uma menor resistência à compressão. Devido à alta contração volumétrica da resina, houve também maior porcentagem de fratura dos munhões, podendo ter ocorrido devido à falha na adesão munhão e resina 6 . O restaurador micro-híbrido P-60, apesar de pouco se diferenciar na composição química do restaurador micro-hibrido Z-250, teve menor valor de resistência à fratura e 60% de fraturas ocorridas no munhão/raiz, 30% no munhão e 10% na raiz.…”

Section: Discussionunclassified

“…Observa-se que grande quanti dade de falhas clínicas, dentre elas a fratura do remanescente, pode estar relacionada à presença de núcleos intra-radiculares. A resistência à fratura destes dentes está diretamente relacionada com a quanti dade e qualidade da estrutura dentária remanescente, de modo que, durante a restauração dos mesmos, a espessura da denti na radicular deve ser preservada [4][5][6][7] . Assim, faz-se necessário o desenvolvimento de técnicas e materiais capazes de promover, concomitantemente, retenção do material restaurador e resistência ao remanescente dentário.…”

Section: Metodologiaunclassified

Avaliação de Diferentes Compósitos na Resistência à Fratura de Núcleos de Preenchimento

Destro¹

2010

Pesq Bras Odontoped Clin Integr

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“…The technique of cementing the glass fiber intraradicular post together with accessory posts used in this study may have led to a reduction in the amount of cement present inside the root canal, considering that a larger amount of cement would compromise the longevity of cementation due to degradation of the material. With time, this degradation could occur as a result of cyclic loads associated with changes in temperature, pH, and the presence of microorganisms 3,18 . A thicker layer of cementing agent could be subject to greater solubility in the oral cavity and to fatigue.…”

Section: Discussionmentioning

confidence: 99%

“…In this study human teeth were used; therefore, an attempt was made to make laboratory conditions resemble those of a clinical situation, by using teeth having the same mechanical behavior in regard to the dissipation of forces 13,18 . 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 .…”

Section: Discussionmentioning

confidence: 99%

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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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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Effect of incomplete crown ferrules on load capacity of endodontically treated maxillary incisors restored with fiber posts, composite build-ups, and all-ceramic crowns: Anin vitroevaluation after chewing simulation

Abstract: The fracture resistance of endodontically and post/core restored teeth is dependent on the degree of tooth conservation. An incomplete crown ferrule is associated with greater variation in load capacity and, despite high fracture values, inclines to fracture.

Cited by 86 publications

References 18 publications

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Loading Standardization of Postendodontic Restorations In Vitro: Impact of Restorative Stage, Static Loading, and Dynamic Loading

Avaliação de Diferentes Compósitos na Resistência à Fratura de Núcleos de Preenchimento

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

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