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Fracture resistance and microleakage of endocrowns utilizing three CAD-CAM blocks.
Oper Dent. 2015 Mar-Apr; 40(2):201-10.OD

Abstract

This study assessed marginal leakage and fracture resistance of computer-aided design/computer-aided manufacturing (CAD/CAM) fabricated ceramic crowns with intracoronal extensions into the pulp chambers of endodontically treated teeth (endocrowns) using either feldspathic porcelain (CEREC Blocks [CB], Sirona Dental Systems GmbH, Bensheim, Germany), lithium disilicate (e.max [EX], Ivoclar Vivadent, Schaan, Liechtenstein), or resin nanoceramic (Lava Ultimate [LU], 3M ESPE, St Paul, MN, USA).). Thirty extracted human permanent maxillary molars were endodontically treated. Standardized preparations were done with 2-mm intracoronal extensions of the endocrowns into the pulp chamber. Teeth were divided into three groups (n=10); each group was restored with standardized CAD/CAM fabricated endocrowns using one of the three tested materials. After cementation with resin cement, specimens were stored in distilled water at 37°C for one week, subjected to thermocycling, and immersed in a 5% methylene-blue dye solution for 24 hours. A compressive load was applied at 35 degrees to long axis of the teeth using a universal testing machine until failure. Failure load was recorded, and specimens were examined under a stereomicroscope for modes of failure and microleakage. Results were analyzed using one-way analysis of variance and Bonferroni post hoc multiple comparison tests (α=0.05). LU showed significantly (p<0.05) higher fracture resistance and more favorable fracture mode (ie, fracture of the endocrown without fracture of tooth) as well as higher dye penetration than CB and EX. In conclusion, although using resin nanoceramic blocks for fabrication of endocrowns may result in better fracture resistance and a more favorable fracture mode than other investigated ceramic blocks, more microleakage may be expected with this material.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25268039

Citation

El-Damanhoury, H M., et al. "Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks." Operative Dentistry, vol. 40, no. 2, 2015, pp. 201-10.
El-Damanhoury HM, Haj-Ali RN, Platt JA. Fracture resistance and microleakage of endocrowns utilizing three CAD-CAM blocks. Oper Dent. 2015;40(2):201-10.
El-Damanhoury, H. M., Haj-Ali, R. N., & Platt, J. A. (2015). Fracture resistance and microleakage of endocrowns utilizing three CAD-CAM blocks. Operative Dentistry, 40(2), 201-10. https://doi.org/10.2341/13-143-L
El-Damanhoury HM, Haj-Ali RN, Platt JA. Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks. Oper Dent. 2015 Mar-Apr;40(2):201-10. PubMed PMID: 25268039.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fracture resistance and microleakage of endocrowns utilizing three CAD-CAM blocks. AU - El-Damanhoury,H M, AU - Haj-Ali,R N, AU - Platt,J A, Y1 - 2014/09/30/ PY - 2014/10/1/entrez PY - 2014/10/1/pubmed PY - 2016/12/15/medline SP - 201 EP - 10 JF - Operative dentistry JO - Oper Dent VL - 40 IS - 2 N2 - This study assessed marginal leakage and fracture resistance of computer-aided design/computer-aided manufacturing (CAD/CAM) fabricated ceramic crowns with intracoronal extensions into the pulp chambers of endodontically treated teeth (endocrowns) using either feldspathic porcelain (CEREC Blocks [CB], Sirona Dental Systems GmbH, Bensheim, Germany), lithium disilicate (e.max [EX], Ivoclar Vivadent, Schaan, Liechtenstein), or resin nanoceramic (Lava Ultimate [LU], 3M ESPE, St Paul, MN, USA).). Thirty extracted human permanent maxillary molars were endodontically treated. Standardized preparations were done with 2-mm intracoronal extensions of the endocrowns into the pulp chamber. Teeth were divided into three groups (n=10); each group was restored with standardized CAD/CAM fabricated endocrowns using one of the three tested materials. After cementation with resin cement, specimens were stored in distilled water at 37°C for one week, subjected to thermocycling, and immersed in a 5% methylene-blue dye solution for 24 hours. A compressive load was applied at 35 degrees to long axis of the teeth using a universal testing machine until failure. Failure load was recorded, and specimens were examined under a stereomicroscope for modes of failure and microleakage. Results were analyzed using one-way analysis of variance and Bonferroni post hoc multiple comparison tests (α=0.05). LU showed significantly (p<0.05) higher fracture resistance and more favorable fracture mode (ie, fracture of the endocrown without fracture of tooth) as well as higher dye penetration than CB and EX. In conclusion, although using resin nanoceramic blocks for fabrication of endocrowns may result in better fracture resistance and a more favorable fracture mode than other investigated ceramic blocks, more microleakage may be expected with this material. SN - 1559-2863 UR - https://www.unboundmedicine.com/medline/citation/25268039/Fracture_resistance_and_microleakage_of_endocrowns_utilizing_three_CAD_CAM_blocks_ DB - PRIME DP - Unbound Medicine ER -