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Advisory Committee Chair

Perng-Ra Liu

Document Type

Thesis

Date of Award

2012

Degree Name by School

Master of Science (MS) School of Dentistry

Abstract

Clinicians for a single tooth restoration, due to improved esthetics, often select all ceramic crowns. Zirconium Oxide has been utilized for many years to full fill the requirement of esthetics, high mechanical properties and biocompatibility. The purpose of this study is to evaluate the effect of different surface treatments and luting agents on retention of a zirconium oxide crown. Material and Methods: Ninety extracted teeth were obtained. Teeth were mounted in Ortho JetTM resin (Lang Dental Manufacturing Co., Inc. IL, USA). Occlusal surface was cut flat using Isomet (Buhler Ltd). Diamond burs were used to cut axial walls under water spray at an angle of 20 degrees using Milling Machine (Shop-Task Modle 12-22). Impressions were made with Aquasil monophase and XLV (Destply International, York, PA) and poured with ADA Type IV gypsum. CAD/CAM design was used to fabricate Zirconia copings with 1 mm of marginal width, and a hole with 2mm in diameter for crown pull test. Fifty microns of space were incorporated into the crowns for cement thickness. The intaglio surfaces of crowns were treated with Silica-modified Al203 and Al203. Crowns were cemented with different luting cements such as Panavia F2.0, RelyXTM Unicem 2 and Duo-linkTM under 2500 gram pressure. Specimens were restored in distilled water for 3 days. All groups were thermocycled (5000 cycle) and fatigue loaded for 100,000 cycles while emerged in distilled water. Two-Way ANOVA and One-way ANOVA was used to analyze effect of different surface treatments and cements on retention of Y-TZP crowns and followed by Tukey's post hoc test. Also, Two-way ANOVA was used to evaluate interaction between internal fit, axial wall height, total surface area of prepared tooth and crown retention in all the tested groups. Surface treatment increased crown retention, but it was not statistically significant (p>0.05), except Duo-Link cement group (p< 0.05). The use of surface treatment does not increase crown retention in every cement type. Crown retention is dependent to cement type.

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