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The influence of cavity preparation design on fracture strength and mode of fracture of laboratory-processed composite resin restorations.
J Prosthet Dent. 2007 Oct; 98(4):277-84.JP

Abstract

STATEMENT OF PROBLEM

Removal of large amounts of sound tooth structure may result in a weakened restored tooth. Nevertheless, removal of tooth structure for cuspal coverage has been recommended to protect teeth restored with laboratory-processed composite resin (LPCR) from fracture.

PURPOSE

The purpose of this study was to evaluate the influence of different cavity preparation designs on fracture strength and modes of fracture of teeth restored with LPCR.

MATERIAL AND METHODS

Ninety anatomically similar human third mandibular molars were selected. There were 2 experimental factors, occlusal isthmus width (narrow versus wide) and cuspal coverage (inlay, 1-cusp onlay, 2-cusp onlay, and all-cusp onlay), and 1 control group that received no treatment, resulting in 9 groups (n=10). Indirect composite resin (SR Adoro) restorations were manufactured and adhesively cemented with Adper Single Bond 2 and Rely-X ARC. A compressive loading test (0.5 mm/min) was performed. The modes of fracture were classified according to 4 categories. One-way and 2-way ANOVA followed by Tukey-HSD test were used to statistically analyze the fracture load data (alpha =.05).

RESULTS

The statistical analysis failed to show significant differences among restored groups but showed differences between these groups and the control group (P = .001). Two-way ANOVA failed to show any difference when considering the occlusal isthmus width alone (P = .98), cuspal coverage (P = .273), or the interaction between these factors (P = .972). Several teeth had fractures affecting a great amount of both restoration and tooth structure.

CONCLUSIONS

This in vitro study showed restored teeth having similar fracture strength and fracture modes, suggesting that with the tested preparation designs, there is no advantage of cuspal coverage to protect LPCR restored teeth from fracture.

Authors+Show Affiliations

Fonseca RB
Piracicaba Dental School, University of Campinas, Sao Paulo, Brazil.
Fernandes-Neto AJ
No affiliation info available
Correr-Sobrinho L
No affiliation info available
Soares CJ
No affiliation info available

MeSH

Analysis of VarianceComposite ResinsDental Cavity PreparationDental Restoration FailureDental Stress AnalysisHumansInlaysMolar, ThirdStatistics, NonparametricTooth Fractures

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17936127

Citation

Fonseca, Rodrigo Borges, et al. "The Influence of Cavity Preparation Design On Fracture Strength and Mode of Fracture of Laboratory-processed Composite Resin Restorations." The Journal of Prosthetic Dentistry, vol. 98, no. 4, 2007, pp. 277-84.
Fonseca RB, Fernandes-Neto AJ, Correr-Sobrinho L, et al. The influence of cavity preparation design on fracture strength and mode of fracture of laboratory-processed composite resin restorations. J Prosthet Dent. 2007;98(4):277-84.
Fonseca, R. B., Fernandes-Neto, A. J., Correr-Sobrinho, L., & Soares, C. J. (2007). The influence of cavity preparation design on fracture strength and mode of fracture of laboratory-processed composite resin restorations. The Journal of Prosthetic Dentistry, 98(4), 277-84.
Fonseca RB, et al. The Influence of Cavity Preparation Design On Fracture Strength and Mode of Fracture of Laboratory-processed Composite Resin Restorations. J Prosthet Dent. 2007;98(4):277-84. PubMed PMID: 17936127.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The influence of cavity preparation design on fracture strength and mode of fracture of laboratory-processed composite resin restorations. AU - Fonseca,Rodrigo Borges, AU - Fernandes-Neto,Alfredo Julio, AU - Correr-Sobrinho,Lourenco, AU - Soares,Carlos Jose, PY - 2007/10/16/pubmed PY - 2007/12/7/medline PY - 2007/10/16/entrez SP - 277 EP - 84 JF - The Journal of prosthetic dentistry JO - J Prosthet Dent VL - 98 IS - 4 N2 - STATEMENT OF PROBLEM: Removal of large amounts of sound tooth structure may result in a weakened restored tooth. Nevertheless, removal of tooth structure for cuspal coverage has been recommended to protect teeth restored with laboratory-processed composite resin (LPCR) from fracture. PURPOSE: The purpose of this study was to evaluate the influence of different cavity preparation designs on fracture strength and modes of fracture of teeth restored with LPCR. MATERIAL AND METHODS: Ninety anatomically similar human third mandibular molars were selected. There were 2 experimental factors, occlusal isthmus width (narrow versus wide) and cuspal coverage (inlay, 1-cusp onlay, 2-cusp onlay, and all-cusp onlay), and 1 control group that received no treatment, resulting in 9 groups (n=10). Indirect composite resin (SR Adoro) restorations were manufactured and adhesively cemented with Adper Single Bond 2 and Rely-X ARC. A compressive loading test (0.5 mm/min) was performed. The modes of fracture were classified according to 4 categories. One-way and 2-way ANOVA followed by Tukey-HSD test were used to statistically analyze the fracture load data (alpha =.05). RESULTS: The statistical analysis failed to show significant differences among restored groups but showed differences between these groups and the control group (P = .001). Two-way ANOVA failed to show any difference when considering the occlusal isthmus width alone (P = .98), cuspal coverage (P = .273), or the interaction between these factors (P = .972). Several teeth had fractures affecting a great amount of both restoration and tooth structure. CONCLUSIONS: This in vitro study showed restored teeth having similar fracture strength and fracture modes, suggesting that with the tested preparation designs, there is no advantage of cuspal coverage to protect LPCR restored teeth from fracture. SN - 0022-3913 UR - https://www.unboundmedicine.com/medline/citation/17936127/The_influence_of_cavity_preparation_design_on_fracture_strength_and_mode_of_fracture_of_laboratory_processed_composite_resin_restorations_ DB - PRIME DP - Unbound Medicine ER -