Tags

Type your tag names separated by a space and hit enter

CAD/CAM Polymer vs Direct Composite Resin Core Buildups for Endodontically Treated Molars Without Ferrule.
Oper Dent. 2016 Jan-Feb; 41(1):53-63.OD

Abstract

OBJECTIVES

The aim of this study was to investigate the restoration of broken-down endodontically treated molars without ferrule effect using glass ceramic crowns on different composite resin core buildups.

METHODS AND MATERIALS

Forty-five decoronated endodontically treated teeth (no ferrule) were restored with a semidirect buildup using an experimental computer-aided design/computer-aided manufacturing (CAD/CAM) high-performance polymer (HPP group) or with light-curing composite core buildups of Tetric EvoCeram with (TECP group) or without (TEC group) a glass-fiber-reinforced post. All teeth were prepared to receive bonded glass ceramic crowns (Empress CAD luted with Variolink II) and were subjected to accelerated fatigue testing. Cyclic isometric loading was applied to the palatal cusp at an angle of 30° and a frequency of 5 Hz, beginning with a load of 200 N (×5000 cycles) and followed by stages of 400, 600, 800, 1000, 1200, and 1400 N at a maximum of 30,000 cycles each. Specimens were loaded until failure or to a maximum of 185,000 cycles. Groups were compared using the life-table survival analysis (log rank test at p=0.05). Average fracture loads and number of survived cycles were compared with one-way analysis of variance (Scheffé post hoc at p=0.05).

RESULTS

None of the tested specimen withstood all 185,000 load cycles. There was a significant difference in mean fracture load, survived cycles, and survival; the HPP group (fracture load 975.27N±182.74) was significantly higher than the TEC (716.87N±133.43; p=0.001) and TECP (745.67±156.34; p=0.001) groups, and the TEC and TECP groups showed no difference (p=0.884). Specimens in the TECP group were affected by an initial failure phenomenon (wide gap at the margin between the buildup/crown assembly and the root).

CONCLUSIONS

Semidirect core buildup made from high-performance polymer enhanced the performance of all-ceramic leucite-reinforced glass ceramic crowns compared with direct light-curing composite resin buildups. The use of a fiber-reinforced post system did not influence the fatigue strength of all-ceramic crowns.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

26266648

Citation

Güth, J-F, et al. "CAD/CAM Polymer Vs Direct Composite Resin Core Buildups for Endodontically Treated Molars Without Ferrule." Operative Dentistry, vol. 41, no. 1, 2016, pp. 53-63.
Güth JF, Edelhoff D, Goldberg J, et al. CAD/CAM Polymer vs Direct Composite Resin Core Buildups for Endodontically Treated Molars Without Ferrule. Oper Dent. 2016;41(1):53-63.
Güth, J. F., Edelhoff, D., Goldberg, J., & Magne, P. (2016). CAD/CAM Polymer vs Direct Composite Resin Core Buildups for Endodontically Treated Molars Without Ferrule. Operative Dentistry, 41(1), 53-63. https://doi.org/10.2341/14-256-L
Güth JF, et al. CAD/CAM Polymer Vs Direct Composite Resin Core Buildups for Endodontically Treated Molars Without Ferrule. Oper Dent. 2016 Jan-Feb;41(1):53-63. PubMed PMID: 26266648.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - CAD/CAM Polymer vs Direct Composite Resin Core Buildups for Endodontically Treated Molars Without Ferrule. AU - Güth,J-F, AU - Edelhoff,D, AU - Goldberg,J, AU - Magne,P, Y1 - 2015/08/12/ PY - 2015/8/13/entrez PY - 2015/8/13/pubmed PY - 2019/11/27/medline SP - 53 EP - 63 JF - Operative dentistry JO - Oper Dent VL - 41 IS - 1 N2 - OBJECTIVES: The aim of this study was to investigate the restoration of broken-down endodontically treated molars without ferrule effect using glass ceramic crowns on different composite resin core buildups. METHODS AND MATERIALS: Forty-five decoronated endodontically treated teeth (no ferrule) were restored with a semidirect buildup using an experimental computer-aided design/computer-aided manufacturing (CAD/CAM) high-performance polymer (HPP group) or with light-curing composite core buildups of Tetric EvoCeram with (TECP group) or without (TEC group) a glass-fiber-reinforced post. All teeth were prepared to receive bonded glass ceramic crowns (Empress CAD luted with Variolink II) and were subjected to accelerated fatigue testing. Cyclic isometric loading was applied to the palatal cusp at an angle of 30° and a frequency of 5 Hz, beginning with a load of 200 N (×5000 cycles) and followed by stages of 400, 600, 800, 1000, 1200, and 1400 N at a maximum of 30,000 cycles each. Specimens were loaded until failure or to a maximum of 185,000 cycles. Groups were compared using the life-table survival analysis (log rank test at p=0.05). Average fracture loads and number of survived cycles were compared with one-way analysis of variance (Scheffé post hoc at p=0.05). RESULTS: None of the tested specimen withstood all 185,000 load cycles. There was a significant difference in mean fracture load, survived cycles, and survival; the HPP group (fracture load 975.27N±182.74) was significantly higher than the TEC (716.87N±133.43; p=0.001) and TECP (745.67±156.34; p=0.001) groups, and the TEC and TECP groups showed no difference (p=0.884). Specimens in the TECP group were affected by an initial failure phenomenon (wide gap at the margin between the buildup/crown assembly and the root). CONCLUSIONS: Semidirect core buildup made from high-performance polymer enhanced the performance of all-ceramic leucite-reinforced glass ceramic crowns compared with direct light-curing composite resin buildups. The use of a fiber-reinforced post system did not influence the fatigue strength of all-ceramic crowns. SN - 1559-2863 UR - https://www.unboundmedicine.com/medline/citation/26266648/CAD/CAM_Polymer_vs_Direct_Composite_Resin_Core_Buildups_for_Endodontically_Treated_Molars_Without_Ferrule_ L2 - https://meridian.allenpress.com/operative-dentistry/article-lookup/doi/10.2341/14-256-L DB - PRIME DP - Unbound Medicine ER -