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Thickness of CAD-CAM composite resin overlays influences fatigue resistance of endodontically treated premolars.
Dent Mater. 2009 Oct; 25(10):1264-8.DM

Abstract

OBJECTIVES

Evaluate the influence of composite resin CAD-CAM restoration thickness on the in vitro fatigue resistance and failure mode of overlay-type restoration in endodontically treated premolars.

METHODS

Thirty extracted premolars received root canal treatment followed by a standardized tooth preparation (1.5-, 2.5- or 3.5-mm cusp reduction, proximal gingival margins located 1.5mm below the CEJ, glass-ionomer base and immediately sealed dentin with Optibond FL). Restorations were milled using Cerec3 and FiltekMZ100 composite blocks. The intaglio surfaces of the overlays were sandblasted and silanated. Tooth preparations were sandblasted and etched before insertion of the restoration. All restorations were luted with Optibond FL and preheated FiltekZ100. A closed-loop servohydraulic unit was used for simulating cyclic isometric chewing at 5 Hz, starting with a load of 200 N (5000 cycles), followed by stages of 400, 600, 800, 1000, 1200 and 1400 N at a maximum of 30,000 cycles each. All samples were loaded until fracture or to a maximum of 185,000 cycles. Groups were compared using the Kaplan-Meier survival curves.

RESULTS

None of the restored premolars with the 1.5-mm cusp overlap restoration withstood all 185,000 loading cycles. With 2.5- and 3.5-mm cusp overlap, the survival rate was 30% and 40%, respectively. The rate of fracture below the CEJ was 60%, 60% and 30% for 1.5, 2.5 and 3.5 mm of cusp overlap, respectively. Survival of restored premolars with 2.5- and 3.5-mm cusp coverage was not significantly different (p=.23).

SIGNIFICANCE

Thick FiltekMZ100 composite resin onlays showed higher fatigue resistance than thin ones and may be associated with fractures that are less subgingival.

Authors+Show Affiliations

Division of Primary Oral Health Care, School of Dentistry, University of Southern California, Los Angeles, CA 90089-7792, USA. magne@usc.eduNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

19539358

Citation

Magne, Pascal, and Alena Knezevic. "Thickness of CAD-CAM Composite Resin Overlays Influences Fatigue Resistance of Endodontically Treated Premolars." Dental Materials : Official Publication of the Academy of Dental Materials, vol. 25, no. 10, 2009, pp. 1264-8.
Magne P, Knezevic A. Thickness of CAD-CAM composite resin overlays influences fatigue resistance of endodontically treated premolars. Dent Mater. 2009;25(10):1264-8.
Magne, P., & Knezevic, A. (2009). Thickness of CAD-CAM composite resin overlays influences fatigue resistance of endodontically treated premolars. Dental Materials : Official Publication of the Academy of Dental Materials, 25(10), 1264-8. https://doi.org/10.1016/j.dental.2009.05.007
Magne P, Knezevic A. Thickness of CAD-CAM Composite Resin Overlays Influences Fatigue Resistance of Endodontically Treated Premolars. Dent Mater. 2009;25(10):1264-8. PubMed PMID: 19539358.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Thickness of CAD-CAM composite resin overlays influences fatigue resistance of endodontically treated premolars. AU - Magne,Pascal, AU - Knezevic,Alena, Y1 - 2009/06/18/ PY - 2009/03/28/received PY - 2009/05/21/revised PY - 2009/05/27/accepted PY - 2009/6/23/entrez PY - 2009/6/23/pubmed PY - 2009/12/16/medline SP - 1264 EP - 8 JF - Dental materials : official publication of the Academy of Dental Materials JO - Dent Mater VL - 25 IS - 10 N2 - OBJECTIVES: Evaluate the influence of composite resin CAD-CAM restoration thickness on the in vitro fatigue resistance and failure mode of overlay-type restoration in endodontically treated premolars. METHODS: Thirty extracted premolars received root canal treatment followed by a standardized tooth preparation (1.5-, 2.5- or 3.5-mm cusp reduction, proximal gingival margins located 1.5mm below the CEJ, glass-ionomer base and immediately sealed dentin with Optibond FL). Restorations were milled using Cerec3 and FiltekMZ100 composite blocks. The intaglio surfaces of the overlays were sandblasted and silanated. Tooth preparations were sandblasted and etched before insertion of the restoration. All restorations were luted with Optibond FL and preheated FiltekZ100. A closed-loop servohydraulic unit was used for simulating cyclic isometric chewing at 5 Hz, starting with a load of 200 N (5000 cycles), followed by stages of 400, 600, 800, 1000, 1200 and 1400 N at a maximum of 30,000 cycles each. All samples were loaded until fracture or to a maximum of 185,000 cycles. Groups were compared using the Kaplan-Meier survival curves. RESULTS: None of the restored premolars with the 1.5-mm cusp overlap restoration withstood all 185,000 loading cycles. With 2.5- and 3.5-mm cusp overlap, the survival rate was 30% and 40%, respectively. The rate of fracture below the CEJ was 60%, 60% and 30% for 1.5, 2.5 and 3.5 mm of cusp overlap, respectively. Survival of restored premolars with 2.5- and 3.5-mm cusp coverage was not significantly different (p=.23). SIGNIFICANCE: Thick FiltekMZ100 composite resin onlays showed higher fatigue resistance than thin ones and may be associated with fractures that are less subgingival. SN - 1879-0097 UR - https://www.unboundmedicine.com/medline/citation/19539358/Thickness_of_CAD_CAM_composite_resin_overlays_influences_fatigue_resistance_of_endodontically_treated_premolars_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0109-5641(09)00211-5 DB - PRIME DP - Unbound Medicine ER -