Influence of cavity preparation design on fracture resistance of posterior Leucite-reinforced ceramic restorations

Soares, Carlos José; Martins, Luís Roberto Marcondes; Fonseca, Rodrigo Borges; Correr-Sobrinho, Lourenço; Neto, Alfredo Júlio Fernandes

doi:10.1016/j.prosdent.2006.03.022

Cited by 129 publications

(138 citation statements)

References 21 publications

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“…6 They do, however, present limitations with regard to obtaining information on the internal behavior of the tooth-restoration complex. 21 Therefore, it is important to associate non-destructive methodologies, such as strain gauge measurement, and computational analysis, such as finite element analysis, to provide a clearer understanding of the biomechanical behavior of a restorative procedure. 3 Strain gauges were fixed on the proximal surface, placed perpendicular to the long root axis, and used to measure the tensile strain of the proximal surface induced by the placement of the posts.…”

Section: Discussionmentioning

confidence: 99%

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Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

et al. 2013

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The aim of this study was to evaluate the effect of parallel and tapered threaded post placement on the strain and stress distribution of endodontically treated teeth. Fifteen bovine incisors were sectioned 15 mm from their apices, endodontically treated, and divided into three groups (n = 5) according to three different threaded posts: parallel threaded post (Radix-Anker, RA); tapered threaded post (Euro-Post, EP) and tapered threaded post (Reforpost II, RII). A strain-gauge was fixed on the proximal surface perpendicular to the long root axis, 2 mm from the cervical limit. Strain generated during post placement was recorded and compared using one-way ANOVA and Tukey's test (α = .05). A scanning electron microscope was used to examine the longitudinal root sections. Stress was evaluated for each group in a two-dimensional finite element analysis. The models were meshed with tetrahedron elements and loaded with 2 N at an angle of 135° to the lingual face. The equivalent Von Mises stress was calculated. The one-way ANOVA showed significant difference among the groups. The RA group (150.0 ± 12.2 A) produced higher external strain than the RII (80.0 ± 12.2 B) and the EP (70.0 ± 6.1 B) groups. The inner strain was approximately five times greater than the external dentin strain. High stress concentrations in each thread of the posts were observed. Scanning electron micrographs showed cracks that started in the threads of the posts. The threaded post placement induced root strain mainly on the parallel side post. Root strain and stress concentration on the post threads tended to create cracks in the inner root canal dentin.

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Section: Discussionmentioning

confidence: 99%

“…21 The value of the residual strain is shown in Figure 1B A total load of 2 N was applied on two adjacent nodes (1 N each) at the palatine surface, at a 135° angle to the longitudinal axis of the tooth ( Figure 2A). Von Mises equivalent stresses were determined for stress assessment ( Figure 2B).…”

Section: Strain Gauge Testmentioning

confidence: 99%

Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

et al. 2013

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“…In order to simulate teeth in a periodontal ligament, the teeth were fixed in polystyrene molds according to the manufacturer's instructions using a light condensation silicone elastomeric material 17 .…”

Section: Methodsmentioning

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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“…Forty freshly extracted human canines with similar root dimensions and morphology were selected by measuring the buccolingual and mesiodistal widths (in mm) using a digital caliper, allowing a maximum deviation of 10% from the determined mean. 20 The teeth were stored in 0.1% thymol solution for up to 4 months. Soft tissue deposits were removed with periodontal scalers and the roots were sectioned transversally, 17.0 mm from the apex, using a low-spead diamond saw (Isomet 1000, Buehler, Lake Bluff, IL).…”

Section: Specimen Preparationmentioning

confidence: 99%

Effect of Endodontic Retreatment on Push-out Bond Strength and Quality of Fiber Postbonding Interface of Resin Cements

Kato

et al. 2016

The Journal of Contemporary Dental Practice

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Aim:The aim of this study is to evaluate the impact of endodontic retreatment on push-out bond strength and dentin interface of two resin cements used for fiber postcementation during endodontic retreatment. Materials and methods:The root canals of 40 extracted human canines were prepared, obturated and divided into four groups (n = 10). Gutta-percha was partially removed and fiber posts were immediately cemented in groups 1 and 2 using Panavia F with ED Primer and RelyX™ U200, respectively. In groups 3 and 4, the root canal access was sealed with temporary restorative cement, specimens were stored for 30 days, endodontically retreated, and fiber posts were cemented using the resin cements applied to groups 1 and 2, respectively. Push-out tests and scanning electron microscopy analyses of different areas were performed. Data from push-out bond strengths were analyzed by one-way analysis of variance and Tukey's tests. Results:Higher bond strength values were detected in the apical third for group 1 than group 3 (p < 0.05). No differences were observed in other comparisons between the same third of different groups (p > 0.05). Comparisons between different thirds in the same group revealed a higher bond strength in the apical third for group 1. Scanning electron microscopy showed formation of hybrid layer and extensive resin tags in group 1. No hybrid layer was observed in groups 2 and 4. Effect of Endodontic Retreatment on Conclusion:Endodontic retreatment had adverse effects on the push-out bond strength and dentinal interface of Panavia F with ED Primer when used for fiber postcementation specifically in the apical third, but not on RelyX™ U200.Clinical significance: A significant interaction was detected between endodontic retreatment and resin cement, which indicated that endodontic retreatment might adversely affect the push-out bond strength and dentinal interface of Panavia F with ED Primer when used for fiber postcementation specifically in the apical third.

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Influence of cavity preparation design on fracture resistance of posterior Leucite-reinforced ceramic restorations

Cited by 129 publications

References 21 publications

Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

Effects of threaded post placement on strain and stress distribution of endodontically treated teeth

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

Effect of Endodontic Retreatment on Push-out Bond Strength and Quality of Fiber Postbonding Interface of Resin Cements

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