Advisory Committee Chair
John O Burgess
Advisory Committee Members
Amjad Javed
Jack E Lemons
Lance Ramp
Nathaniel C Lawson
Document Type
Thesis
Date of Award
2015
Degree Name by School
Master of Science in Dentistry (MScD) School of Dentistry
Abstract
Objectives: To measure retention of lithium disilicate (IPS e.max CAD, Ivoclar Viva-dent) and zirconia reinforced lithium disilicate (CELTRATM DUO, Dentsply) copings luted using resin cements and resin-modified glass ionomer cement. Methods: 110 Extracted human, non-carious mandibular 2nd premolars (n=10) were embedded in PVC cylinders with acrylic resin and placed into a lathe to produce a uni-form crown preparation (22°-convergence & 3mm-height). Following the orientation groove placement (69L bur), preparations were scanned and milled using a CEREC 3D/Sirona machine to produce e.max and CELTRATM DUO crowns. Preparations were imaged with a digital microscope (Keyence/VHX-600-20X) and the surface area of each crown was calculated. IPS e.max crowns and CELTRATM DUO crowns were cemented using the cements as in Tables 1 & 2. Specimens were stored (distilled water/37°C/24h) and thermocycled (10,000cycles/5-50°C/30secs) before debonding in tension at crosshead speed-5mm/min (INSTRON Model/5565). The bond strength was calculated by dividing the failure load with preparation surface area. The CELTRATM DUO and e.max data were compared separately with 1-way ANOVA and Tukey post-hoc analysis (alpha=0.05). Results: The simulated crown strength test results for e.max were: Calibra=4.89±2.35a; ExpE(TE)=3.70±2.08a,b; ExpSE=3.18±2.03a,b RelyXLP=3.11±1.99a,b; ExpE(Self-Etch)=2.74±1.23a,b; Multilink=2.66±1.72a,b; RelyXU=2.65±1.46a,b; Re-lyXLP/HF=1.91±0.70b. For CELTRATM: Exp/S=4.73±2.45a; Exp/S/E=4.40±1.76a,b; Re-lyXLP/HF=3.34±1.65a,b,c; Exp=1.79±0.70b,c; and RelyXLP=0.95±0.58c. The ANOVA showed some significant differences between groups (p=0.01) where the same letter denotes similar groups. Conclusions: The Calibra material resulted in significantly higher retention with the than RelyXLP/HF for the coping fabricated from emax. The experimental resin cement with silane when compared to Exp and RelyXLP resulted in significantly higher test retention strength for the CELTRATM DUO.
Recommended Citation
Sonavane, Shruti Sushilkumar, "Retention Of Cad/Cam Crowns Luted With Resin Cements And Rmgi" (2015). All ETDs from UAB. 3008.
https://digitalcommons.library.uab.edu/etd-collection/3008