Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks
dc.contributor.author | El-Damanhoury, Hatem M. | |
dc.contributor.author | Haj-Ali, Reem N. | |
dc.contributor.author | Platt, Jeffrey A. | |
dc.contributor.department | Department of Biomedical and Applied Sciences, IU School of Dentistry | en_US |
dc.date.accessioned | 2017-03-22T19:30:39Z | |
dc.date.available | 2017-03-22T19:30:39Z | |
dc.date.issued | 2015-03 | |
dc.description.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. | en_US |
dc.eprint.version | Final published version, Used by permission. © Operative Dentistry, Inc. Transmission or reproduction of protected items beyond that allowed by fair use requires the written permission of Operative Dentistry, Inc. | en_US |
dc.identifier.citation | 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), 201-210. | en_US |
dc.identifier.uri | https://hdl.handle.net/1805/12112 | |
dc.language.iso | en | en_US |
dc.relation.isversionof | 10.2341/13-143-L | en_US |
dc.relation.journal | Operative dentistry | en_US |
dc.rights | Publisher Policy | en_US |
dc.source | Publisher | en_US |
dc.subject | fracture resistance | en_US |
dc.subject | CAD-CAM blocks | en_US |
dc.subject | endocrown restorations | en_US |
dc.title | Fracture Resistance and Microleakage of Endocrowns Utilizing Three CAD-CAM Blocks | en_US |
dc.type | Article | en_US |
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- 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.
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