The fracture load and failure types of veneered anterior zirconia crowns: An analysis of normal and Weibull distribution of complete and censored data

Stawarczyk, Bogna; Özcan, Mutlu; Hämmerle, Christoph H. F.; Roos, Małgorzata

doi:10.1016/j.dental.2011.11.023

Cited by 28 publications

(24 citation statements)

References 17 publications

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“…A higher Weibull modulus indicates lower variability of strength, due to flaws and defects in the material [47,48]. In Weibull statistics, the characteristic strength (s) represents the 63.21 percentile of strength distribution [48,49]. In the present study, the fracture load data were supported with Weibull distribution, in which failure probability can be predicted at any level of stress.…”

Section: Discussionsupporting

confidence: 54%

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Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

et al. 2016

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OBJECTIVES To evaluate marginal adaptation, fracture load and failure types of CAD/CAM polymeric inlays. METHODS Standardized prepared human molars (48) were divided into four groups (n=12): (A) PCG (positive control group); adhesively luted glass-ceramic inlays, (B) TRX; CAD/CAM polymeric inlays luted using a self-adhesive resin cement, (C) TAC; CAD/CAM polymeric inlays luted using a conventional resin cement, and (D) NCG (negative control group); direct-filled resin-based composite restorations. All specimens were subjected to a chewing simulator. Before and after chewing fatigue, marginal adaptation was assessed at two interfaces: (1) between dental hard tissues and luting cement and (2) between luting cement and restoration. Thereafter, the specimens were loaded and the fracture loads, as well as the failure types, were determined. The data were analysed using three-and one-way ANOVA with post hoc Scheffé test, two sample Student's t-test (p<0.05). RESULTS Before and after chewing fatigue, marginal adaptation for interface 1 showed significantly better results for TRX and PCG than for TAC (p=0.001-0.02) and NCG (p=0.001-0.047). For interface 2, marginal adaptation for TAC was significantly inferior to TRX (p<0.001) and PCG (p<0.001). Chewing fatigue had a negative impact on the marginal adaptation of TAC and NCG. No significant differences in fracture load were found between all tested groups. SIGNIFICANCE Self-adhesive luted polymeric CAD/CAM inlays showed similar marginal adaptation and fracture load values compared to adhesively luted glass-ceramic inlays. CAD/CAM polymeric inlays luted using a self-adhesive resin cement, C) TAC; CAD/CAM polymeric inlays luted using a conventional resin cement, and D) NCG (negative control group); direct-filled resin-based composite restorations. All specimens were subjected to a chewing simulator. Before and after chewing fatigue, marginal adaptation was assessed at two interfaces: 1) between dental hard tissues and luting cement and 2) between luting cement and restoration. Thereafter, the specimens were loaded and the fracture loads, as well as the failure types, were determined. The data were analysed using three-and one-way ANOVA with post-hoc Scheffé test, two sample Student's t-test and Weibull statistics (p < 0.05).Results: Before and after chewing fatigue, marginal adaptation for interface 1 showed significantly better results for TRX and PCG than for TAC (p = 0.001 -0.02) and NCG (p = 0.001 -0.047). For interface 2, marginal adaptation for TAC was significantly inferior to TRX (p < 0.001) and PCG (p < 0.001). Chewing fatigue had a negative impact on the marginal adaptation of TAC and NCG. No significant differences in fracture load were found between all tested groups. Group TAC showed the highest Weibull moduli (m = 4.49) and group PCG the lowest (m = 2.78).Significance: Self-adhesive luted polymeric CAD/CAM inlays showed similar marginal adaptation and fracture load values compared to adhesively luted glass-ceramic inlays.3

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

et al. 2016

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“…However, although the shear bond strength data suggest, that the application and polymerization of the resin infiltrant on the dentin surfaces did not impair the demineralizing and adhesive efficacy of the self-etching adhesive, the Weibull modulus m is remarkably low in this group indicating low reliability [21]. Also, the amount of cohesive failures is reduced compared to the control.…”

Section: Discussionmentioning

confidence: 69%

Influence of caries infiltrant contamination on shear bond strength of different adhesives to dentin

et al. 2012

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OBJECTIVES: To analyze whether the contamination with a caries infiltrant system impairs the adhesive performance of etch-and-rinse and self-etching adhesives on dentin. MATERIALS AND METHODS: Dentin contamination with the caries infiltrant system (Icon, DMG) was simulated by applying either hydrochloric acid (15 % HCl, Icon Etch, 15 s), the resin infiltrant (Icon infiltrant, 4 min), or both prior to the application of the respective adhesives (each group n = 10). In the control groups, the etch-and-rinse adhesive (Optibond FL, Kerr) and the self-etching adhesive (iBOND Self Etch, Hereaus) were applied without former contamination with the infiltrant system. Additionally, the adhesive performance of the resin infiltrant alone was tested. Shear bond strength of a nano-hybrid composite was analyzed after thermocycling (5,000×, 5-55°C) of the specimens and analyzed by ANOVA/Scheffé post hoc tests (p < 0.05) and Weibull statistics. Failure mode was inspected under a stereomicroscope at × 25 magnification. RESULTS: Contamination with the resin infiltrant alone did not impair shear bond strength, while contamination with hydrochloric acid or with hydrochloric acid and the resin infiltrant reduced shear bond strength (MPa) of the adhesives (Optibond FL: 20.5 ± 3.6, iBOND Self Etch: 17.9 ± 2.6) significantly. Hydrochloric acid contamination increased the number of adhesive failures. The adhesive performance of the caries infiltrant system alone was insufficient. CONCLUSION: The contamination with the caries infiltrant system impaired the shear bond strength of conventional dental adhesives. CLINICAL RELEVANCE: Contamination of the caries infiltrant system on dentin should be avoided due to the detrimental effect of hydrochloric acid etching. Clinical relevance: Contamination of the caries infiltrant system on dentin should be avoided due to the detrimental effect of hydrochloric acid etching.3

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“…Consequently, a fractographical failure analysis is impossible for the data at hand and we are unable to decide if multiple flaws might control the distribution. In a case where we had pictures, we could have applied the methodology suggested by Jakus et al [38] or Johnson [39] which was successfully utilised in Stawarczyk et al [40].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of bond strength of resin cements using different general-purpose statistical software packages for two-parameter Weibull statistics

Roos

Stawarczyk

2012

Dental Materials

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OBJECTIVES: This study evaluated and compared Weibull parameters of resin bond strength values using six different general-purpose statistical software packages for two-parameter Weibull distribution. METHODS: Two-hundred human teeth were randomly divided into 4 groups (n=50), prepared and bonded on dentin according to the manufacturers' instructions using the following resin cements: (i) Variolink (VAN, conventional resin cement), (ii) Panavia21 (PAN, conventional resin cement), (iii) RelyX Unicem (RXU, self-adhesive resin cement) and (iv) G-Cem (GCM, self-adhesive resin cement). Subsequently, all specimens were stored in water for 24h at 37°C. Shear bond strength was measured and the data were analyzed using Anderson-Darling goodness-of-fit (MINITAB 16) and two-parameter Weibull statistics with the following statistical software packages: Excel 2011, SPSS 19, MINITAB 16, R 2.12.1, SAS 9.1.3. and STATA 11.2 (p 0.05). Additionally, the three-parameter Weibull was fitted using MNITAB 16. RESULTS: Two-parameter Weibull calculated with MINITAB and STATA can be compared using an omnibus test and using 95% CI. In SAS only 95% CI were directly obtained from the output. R provided no estimates of 95% CI. In both SAS and R the global comparison of the characteristic bond strength among groups is provided by means of the Weibull regression. EXCEL and SPSS provided no default information about 95% CI and no significance test for the comparison of Weibull parameters among the groups. In summary, conventional resin cement VAN showed the highest Weibull modulus and characteristic bond strength. SIGNIFICANCE: There are discrepancies in the Weibull statistics depending on the software package and the estimation method. The information content in the default output provided by the software packages differs to very high extent. AbstractObjectives: This study evaluated and compared Weibull parameters of resin bond strength values using six different general-purpose statistical software packages for two-parameter Weibull distribution. Methods: Two-hundred human teeth were randomly divided into 4 groups (n=50), prepared and bonded on dentin according to the manufacturers' instructions using the following resin cements: i) Variolink (VAN, conventional resin cement), ii) Panavia21 (PAN, conventional resin cement), iii) RelyX Unicem (RXU, self-adhesive resin cement) and iv) G-Cem (GCM, selfadhesive resin cement). Subsequently, all specimens were stored in water for 24 h at 37°C. Shear bond strength was measured and the data were analysed using

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The fracture load and failure types of veneered anterior zirconia crowns: An analysis of normal and Weibull distribution of complete and censored data

Cited by 28 publications

References 17 publications

Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

Marginal adaptation, fracture load and macroscopic failure mode of adhesively luted PMMA-based CAD/CAM inlays

Influence of caries infiltrant contamination on shear bond strength of different adhesives to dentin

Evaluation of bond strength of resin cements using different general-purpose statistical software packages for two-parameter Weibull statistics

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