Effects of Various Thicknesses on Load to Fracture of Posterior CAD/CAM Lithium Disilicate Glass Ceramic Crowns Subjected to Cyclic Fatigue
atmire.cua.enabled | ||
dc.contributor.advisor | Platt, Jeffrey A. | |
dc.contributor.author | Al-Angari, Nadia | |
dc.contributor.other | Bottino, Marco C. | |
dc.contributor.other | Haug, Steven P. | |
dc.contributor.other | Brown, David T. | |
dc.contributor.other | Levon, John A. | |
dc.date.accessioned | 2015-06-24T00:15:51Z | |
dc.date.available | 2015-06-24T00:15:51Z | |
dc.date.issued | 2015 | |
dc.degree.date | 2015 | en_US |
dc.degree.discipline | School of Dentistry | en |
dc.degree.grantor | Indiana University | en_US |
dc.degree.level | M.S.D. | en_US |
dc.description | Indiana University-Purdue University Indianapolis (IUPUI) | en_US |
dc.description.abstract | Background: New glass ceramics and Computer-Aided Design/Computer Assisted Manufacture (CAD/CAM) have become common aspects of modern dentistry. The use of posterior ceramic crowns with a high level of esthetics, fabricated using the CAD/CAM technology is a current treatment modality. Several materials have been used to fabricate these crowns, including lithium disilicate glass-ceramics, which have not been fully investigated in the literature. Objective: to investigate the load to fracture of lithium disilicate glass ceramic posterior crowns fabricated by CAD/CAM technology with different material thicknesses adhesively cemented on epoxy resin. Methods: Four groups of different ceramic thicknesses (0.5 mm, 1 mm, 1.5 mm, and 2 mm) were fabricated by milling CAD/CAM lithium disilicate IPS emax CAD blocks. A total of 68 posterior crowns were surface treated and luted with a resin adhesive cement on an epoxy resin model. Samples were fatigued then loaded to fracture using a universal testing machine to test the fracture strength. Statistical comparisons between various crown thicknesses were performed using one-way ANOVA followed by Fisher's Protected Least Significant Differences. Results: There was a significant difference in the load-to-fracture (N) value for all comparisons of the four thickness groups (p < 0.0001), except 2 mm vs. 1.5 mm (p = 0.325). The mean load-to-fracture (N) was significantly higher for 2 mm than for 1 mm or 0.5 mm. Additionally, the mean load-to-fracture was significantly higher for 1.5 mm than for 1 mm or 0.5 mm. Furthermore, the mean load-to-fracture was significantly higher for 1 mm than for 0.5 mm. Conclusion: Within the limitation of this study, it is advisable for clinical applications to consider a crown thickness of 1.5 mm or greater of milled lithium disilicate for posterior single teeth. | en_US |
dc.identifier.uri | https://hdl.handle.net/1805/6495 | |
dc.identifier.uri | http://dx.doi.org/10.7912/C2/1582 | |
dc.language.iso | en_US | en_US |
dc.subject | ceramic | en_US |
dc.subject | lithium disilicate | en_US |
dc.subject | CAD/CAM | en_US |
dc.subject.mesh | Ceramics -- chemistry | en_US |
dc.subject.mesh | Dental Porcelain -- chemistry | en_US |
dc.subject.mesh | Computer-Aided Design | en_US |
dc.subject.mesh | Dental Restoration Failure | en_US |
dc.subject.mesh | Crowns | en_US |
dc.subject.mesh | Molar | en_US |
dc.subject.mesh | Dental Prosthesis Design -- methods | en_US |
dc.subject.mesh | Surface Properties | en_US |
dc.title | Effects of Various Thicknesses on Load to Fracture of Posterior CAD/CAM Lithium Disilicate Glass Ceramic Crowns Subjected to Cyclic Fatigue | en_US |
dc.type | Thesis | en |
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