J Korean Acad Conserv Dent.  2005 Mar;30(2):112-120. 10.5395/JKACD.2005.30.2.112.

Microleakage of the class V cavity according to restoration site and cavity size using SEM and three-dimensional reconstruction techniques

• Yang IS
• Shin DH

• KMID: 1987003
• DOI: http://doi.org/10.5395/JKACD.2005.30.2.112

Abstract

This study was done to evaluate whether there were any differences in microleakage of class V composite restorations according to restoration site and cavity size. Total sixty-four restorations were made in molar teeth using Esthet-X. Small (2 x 2 x 1.5 mm) and large (4 x 2 x 1.5 mm) restorations were made at the buccal/lingual surface and the proximal surface each. After 1,000 times of thermocycling (5degrees C - 55degrees C), resin replica was made and the percentage of marginal gap to the whole periphery of the restoration was estimated from SEM evaluation. Thermocycled tooth was dye penetrated with 50% silver nitrate solution. After imbedding in an auto-curing resin, it was serially ground with a thickness of 0.25 mm. Volumetric microleakage was estimated after reconstructing three dimensionally. Two-way ANOVA and independent T-test for dye volume, Mann-Whitney U test for the percentage of marginal gap, Spearman's rho test for the relationship between two techniques were used. The results were as follows: 1. The site and size of the restoration affected on the microleakage of restoration. Namely, much more leakage was seen in the proximal and the large restorations rather than the buccal/lingual and the small restorations. 2. Close relationship was found between two techniques (Correlation coefficient = 0.614 / P = 0.000). Within the limits of this study, it was noted that proximal and the large restorations leaked more than buccal/lingual and the small restorations. Therefore, it should be strictly recommended large exposure of margins should be avoided by reducing unnecessary tooth reduction.

Keyword

Microleakage; Restoration site; Cavity size; Three-dimensional reconstruction; SEM

MeSH Terms

Molar
Silver Nitrate
Tooth
Silver Nitrate

Figure

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  Figure 1 Occlusal view of three-dimensionally reconstructed image (Green : restoration, Red : dye)

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  Figure 2 Calculation of marginal gap: Percentage of marginal gap to cavity perimeter (SEM image ; × 35) (Blue line : cavity perimeter, Red line : area with marginal gap)

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  Figure 3 Internal view of three-dimensionally reconstructed images of experimental groups (Green : restoration, Red : dye)

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