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Simulated fatigue resistance of composite resin versus porcelain CAD/CAM overlay restorations on endodontically treated molars.
Quintessence Int. 2009 Feb; 40(2):125-33.QI

Abstract

OBJECTIVE

To assess the influence of material selection (porcelain versus composite resin) for overlay-type restoration of endodontically treated molars and its effect on the in vitro fatigue resistance and failure mode.

METHOD AND MATERIALS

A standardized tooth preparation was applied to 30 extracted molars, including root canal treatment, 3-mm coverage of all cusps, a mesial box 1.5 mm below the cementoenamel junction (CEJ), a distal box in enamel, a glass-ionomer base, and immediately sealed dentin. Using the Cerec machine (Sirona), all teeth were restored with an overlay of standardized thickness and occlusal anatomy. Fifteen restorations were milled in the ceramic Vita MKII block (Vident) and the other 15 using the composite resin Paradigm MZ100 block (3M ESPE). The intaglio surfaces of the ceramic restorations were etched and silanated. The intaglio surfaces of the composite resin overlays were airborne-particle abraded and silanated. Preparations were airborne-particle abraded and etched before restoration insertion. All restorations were adhesively luted with an adhesive resin (Optibond FL, Kerr) and a light-curing composite resin (Filtek Z100, 3M ESPE). Cyclic isometric chewing (5 Hz) was simulated, starting with a load of 200 N (5,000 cycles), followed by stages of 400, 600, 800, 1,000, 1,200, and 1,400 N at a maximum of 30,000 cycles each. Samples were loaded until fracture or to a maximum of 185,000 cycles.

RESULTS

MKII overlays fractured at a mean load of 1,147 N, and none of them withstood all 185,000 loading cycles (survival = 0%); with MZ100, the survival rate was 73%. With MKII, 40% of the fractures ended below the CEJ; with MZ100, only 25% did.

CONCLUSIONS

Composite resin MZ100 increased the fatigue resistance of overlay-type restorations in endodontically treated molars when compared to porcelain MKII. The efficiency of the bond strategy (immediate dentin sealing) was demonstrated by the absence of adhesive failures.

Authors+Show Affiliations

School of Dentistry, University of Southern California, Los Angeles, CA 90089, USA. magne@usc.eduNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

19169444

Citation

Magne, Pascal, and Alena Knezevic. "Simulated Fatigue Resistance of Composite Resin Versus Porcelain CAD/CAM Overlay Restorations On Endodontically Treated Molars." Quintessence International (Berlin, Germany : 1985), vol. 40, no. 2, 2009, pp. 125-33.
Magne P, Knezevic A. Simulated fatigue resistance of composite resin versus porcelain CAD/CAM overlay restorations on endodontically treated molars. Quintessence Int. 2009;40(2):125-33.
Magne, P., & Knezevic, A. (2009). Simulated fatigue resistance of composite resin versus porcelain CAD/CAM overlay restorations on endodontically treated molars. Quintessence International (Berlin, Germany : 1985), 40(2), 125-33.
Magne P, Knezevic A. Simulated Fatigue Resistance of Composite Resin Versus Porcelain CAD/CAM Overlay Restorations On Endodontically Treated Molars. Quintessence Int. 2009;40(2):125-33. PubMed PMID: 19169444.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Simulated fatigue resistance of composite resin versus porcelain CAD/CAM overlay restorations on endodontically treated molars. AU - Magne,Pascal, AU - Knezevic,Alena, PY - 2009/1/27/entrez PY - 2009/1/27/pubmed PY - 2009/7/14/medline SP - 125 EP - 33 JF - Quintessence international (Berlin, Germany : 1985) JO - Quintessence Int VL - 40 IS - 2 N2 - OBJECTIVE: To assess the influence of material selection (porcelain versus composite resin) for overlay-type restoration of endodontically treated molars and its effect on the in vitro fatigue resistance and failure mode. METHOD AND MATERIALS: A standardized tooth preparation was applied to 30 extracted molars, including root canal treatment, 3-mm coverage of all cusps, a mesial box 1.5 mm below the cementoenamel junction (CEJ), a distal box in enamel, a glass-ionomer base, and immediately sealed dentin. Using the Cerec machine (Sirona), all teeth were restored with an overlay of standardized thickness and occlusal anatomy. Fifteen restorations were milled in the ceramic Vita MKII block (Vident) and the other 15 using the composite resin Paradigm MZ100 block (3M ESPE). The intaglio surfaces of the ceramic restorations were etched and silanated. The intaglio surfaces of the composite resin overlays were airborne-particle abraded and silanated. Preparations were airborne-particle abraded and etched before restoration insertion. All restorations were adhesively luted with an adhesive resin (Optibond FL, Kerr) and a light-curing composite resin (Filtek Z100, 3M ESPE). Cyclic isometric chewing (5 Hz) was simulated, starting with a load of 200 N (5,000 cycles), followed by stages of 400, 600, 800, 1,000, 1,200, and 1,400 N at a maximum of 30,000 cycles each. Samples were loaded until fracture or to a maximum of 185,000 cycles. RESULTS: MKII overlays fractured at a mean load of 1,147 N, and none of them withstood all 185,000 loading cycles (survival = 0%); with MZ100, the survival rate was 73%. With MKII, 40% of the fractures ended below the CEJ; with MZ100, only 25% did. CONCLUSIONS: Composite resin MZ100 increased the fatigue resistance of overlay-type restorations in endodontically treated molars when compared to porcelain MKII. The efficiency of the bond strategy (immediate dentin sealing) was demonstrated by the absence of adhesive failures. SN - 1936-7163 UR - https://www.unboundmedicine.com/medline/citation/19169444/Simulated_fatigue_resistance_of_composite_resin_versus_porcelain_CAD/CAM_overlay_restorations_on_endodontically_treated_molars_ L2 - https://www.quintessence-publishing.com/deu/en/article/840083 DB - PRIME DP - Unbound Medicine ER -