Comparison Of Microleakage In Class Ii Composite Restorations In Vitro

Author : James McKinnon Mixson
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.:/5 (222 download)

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Download or read book Comparison of Two-surface and Multiple Surface Scoring Methodologies for in Vitro Microleakage Studies written by James McKinnon Mixson and published by . This book was released on 1990 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most common in vitro method for determining microleakage involves sectioning and scoring restorations in dye-treated extracted teeth. Investigators differ on the number of sectioned surfaces per restoration to measure to assign a score that is most descriptive of the degree of microleakage. The purpose of this study was to measure and compare the microleakage of class V box and V-shaped preparations restored with composite using a two surface and a multiple surface scoring mthodology. Twenty molar teeth each received ane box and one V-shaped preparation on the mesial or distal surface. Occlusal margins were in enamel and gingival margins were in cementum-dentin. Teeth were randomly restored with one of the two composites to comprise four treatment groups with 10 restorations in each group. Two groups received box shaped preparations and were restored with either Dual Cure Scotchbond, P-30 or Scotchbond 2, P-50. Two groups received V-shaped preparations and were restored with either Dual Cure Scotchbond, P-30 or Scotchbond 2, P-50. Teeth were stored for 7 days in normal saline or and thymol, thermocycled, and subjected to silver nitrate staining. Each restoration was then cut into four sections with 8 surfaces. All surfaces were randomly scored by two calibrated examiners. Spearman Rank Correlation determined intra-rater reliability for scoring box and V-shaped preparations to be ≥ 0.74 and ≥ 0.85 respectively. Inter-rater reliability for scoring box and V-shaped preparations was ≥ 0.79 and ≥ 0.84 respectively. Median microleakage scores were determined for central, lateral and end locations for each group, as well as for combined surface locations. A Wilcoxon Matched-Pairs Signed-Rank Test found a statistically significant difference between an end two surface location and a multiple surface scoring methodology for V-shaped preparations restored with Scotchbond 2, P-50 (p ≤ 0.05). No other statistically significant comparisons were detected. A Friedman Two-way Analysis of Variance by Ranks Test found no statistically significant difference in median microleakage scores between central, lateral and end surface locations for each group (p ≤ 0.05) Representative samples and microkeakage patterns were photographed at x30 magnification.