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Influence of overlay restorative materials and load cusps on the fatigue resistance of endodontically treated molars.
Quintessence Int. 2009 Oct; 40(9):729-37.QI

Abstract

OBJECTIVES

To assess the influence of restorative materials and load cusps on the fatigue resistance of endodontically treated molars.

METHOD AND MATERIALS

Thirty extracted molars received root canal treatment followed by a standardized tooth preparation (3-mm cuspal reduction and immediate dentin sealing). Twenty Cerec 3 overlays (Sirona Dental Systems) were milled in the ceramic Vita MKII block (Vident; groups MKIIGL and MKIIGL-Z, oven-glazed), and 10 restorations were duplicated with a composite resin (Miris 2, Coltane/Whaledent; group M2). The fitting surfaces of the restorations were hydrofluoric acid etched (porcelain only) and silanated. Preparations were airborne-particle abraded and etched. All restorations were luted with preheated Filtek Z100 (3M ESPE) and subjected to cyclic isometric chewing (5 Hz) starting at 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. A stainless steel load sphere was used for groups MKIIGL and M2, while a composite resin load sphere was used in group MKIIGL-Z. All samples were loaded until fracture or to a maximum of 185,000 cycles. Groups were compared using the Kaplan-Meier survival curves (P = .05).

RESULTS

None of the molars restored with porcelain withstood all 185,000 loading cycles (survival = 0%). The mean fracture load for MKIIGL was 1,060 N and for MKIIGL-Z, 1,280 N. In group M2, the survival rate was 50%. The rate of fracture below the CEJ was 40%, 30%, and 20% for MKIIGL, MKIIGL-Z, and M2, respectively.

CONCLUSION

Miris 2 overlays showed higher fatigue resistance than MKII porcelain (P = .01) when loaded with a stainless steel antagonist.

Authors+Show Affiliations

Don & Sybil Harrington Foundation Chair of Esthetic Dentistry, Division of Primary Oral Health Care, School of Dentistry, University of Southern California, Los Angeles, Californa 90089-7792, USA. magne@usc.eduNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

19862399

Citation

Magne, Pascal, and Alena Knezevic. "Influence of Overlay Restorative Materials and Load Cusps On the Fatigue Resistance of Endodontically Treated Molars." Quintessence International (Berlin, Germany : 1985), vol. 40, no. 9, 2009, pp. 729-37.
Magne P, Knezevic A. Influence of overlay restorative materials and load cusps on the fatigue resistance of endodontically treated molars. Quintessence Int. 2009;40(9):729-37.
Magne, P., & Knezevic, A. (2009). Influence of overlay restorative materials and load cusps on the fatigue resistance of endodontically treated molars. Quintessence International (Berlin, Germany : 1985), 40(9), 729-37.
Magne P, Knezevic A. Influence of Overlay Restorative Materials and Load Cusps On the Fatigue Resistance of Endodontically Treated Molars. Quintessence Int. 2009;40(9):729-37. PubMed PMID: 19862399.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of overlay restorative materials and load cusps on the fatigue resistance of endodontically treated molars. AU - Magne,Pascal, AU - Knezevic,Alena, PY - 2009/10/29/entrez PY - 2009/10/29/pubmed PY - 2010/11/3/medline SP - 729 EP - 37 JF - Quintessence international (Berlin, Germany : 1985) JO - Quintessence Int VL - 40 IS - 9 N2 - OBJECTIVES: To assess the influence of restorative materials and load cusps on the fatigue resistance of endodontically treated molars. METHOD AND MATERIALS: Thirty extracted molars received root canal treatment followed by a standardized tooth preparation (3-mm cuspal reduction and immediate dentin sealing). Twenty Cerec 3 overlays (Sirona Dental Systems) were milled in the ceramic Vita MKII block (Vident; groups MKIIGL and MKIIGL-Z, oven-glazed), and 10 restorations were duplicated with a composite resin (Miris 2, Coltane/Whaledent; group M2). The fitting surfaces of the restorations were hydrofluoric acid etched (porcelain only) and silanated. Preparations were airborne-particle abraded and etched. All restorations were luted with preheated Filtek Z100 (3M ESPE) and subjected to cyclic isometric chewing (5 Hz) starting at 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. A stainless steel load sphere was used for groups MKIIGL and M2, while a composite resin load sphere was used in group MKIIGL-Z. All samples were loaded until fracture or to a maximum of 185,000 cycles. Groups were compared using the Kaplan-Meier survival curves (P = .05). RESULTS: None of the molars restored with porcelain withstood all 185,000 loading cycles (survival = 0%). The mean fracture load for MKIIGL was 1,060 N and for MKIIGL-Z, 1,280 N. In group M2, the survival rate was 50%. The rate of fracture below the CEJ was 40%, 30%, and 20% for MKIIGL, MKIIGL-Z, and M2, respectively. CONCLUSION: Miris 2 overlays showed higher fatigue resistance than MKII porcelain (P = .01) when loaded with a stainless steel antagonist. SN - 1936-7163 UR - https://www.unboundmedicine.com/medline/citation/19862399/Influence_of_overlay_restorative_materials_and_load_cusps_on_the_fatigue_resistance_of_endodontically_treated_molars_ L2 - https://www.quintessence-publishing.com/deu/en/article/840175 DB - PRIME DP - Unbound Medicine ER -