All ETDs from UAB

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.

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