EVALUATION ON THE ABRASION RESISTANCE OF A SURFACE SEALANT

Article information

Restor Dent Endod. 2007;32(3):180-190

Publication date (electronic) : 2007 January 14

doi : https://doi.org/10.5395/JKACD.2007.32.3.180

Soo-Mee Kim ¹, Sae-Hee Han ², Young-Gon Cho ³^,

¹Department of Dentistry, College of Medicine, Seonam University

²Dental Center, Chung Ang University Hospital

³Department of Conservative Dentistry, College of Dentistry, Chosun University

^*Corresponding Author: Young-Gon Cho, Department of Conservative Dentistry, College of Dentistry, Chosun University 421 Seosuk-dong, Dong-gu, Gwangju, Korea, 501-825 Tel: 82-62-220-3840, 3845 Fax: 82-62-232-9064 E-mail: ygcho@chosun.ac.kr

Received 2007 January 03; Revised 2007 January 27; Accepted 2007 March 09.

Abstract

The purpose of this study was to evaluate the abrasion resistance of surface penetrating sealant which was applied on a composite resin restoration and to provide proper time to reapply sealant on composite resin surface.

Two hundred rectangular specimens, sized 8 × 3 × 2 mm, were made of Micronew (Bisco, Inc., Schaumburg, IL, U.S.A) and divided into two groups; F group (n = 10) was finished with coarse and medium grit of Sof-Lex discs and BisCoverwas applied B group (n = 190) after finishing with discs. B group was again subdivided into nineteen subgroups. From B-1 group to B-18 group were subjected to toothbrush abrasion test using a distilled water-dentifrice slurry and toothbrush heads. B-IM group was not subjected to toothbrush abrasion test.

Average surface roughness (Ra) of each group was calculated using a surface roughness tester (Surfcorder MSE-1700: Kosaka Laboratory Ltd., Tokyo, Japan). A representative specimen of each group was examined by FE-SEM (S-4700: Hitachi High Technologies Co., Tokyo, Japan). The data were analysed using cluster analysis, paired t-test, and repeated measure ANOVA. The results of this study were as follows;

Ra of F group was 0.898 ± 0.145 μm and B-IM group was 0.289 ± 0.142 μm. Ra became higher from B-1 group (0.299 ± 0.48 μm) to B-18 group (0.642 ± 0.313 μm).
Final cluster center of Ra was 0.361 μm in cluster 1 (B-IM ∼ B-7), 0.511 μm in cluster 2 (B-8 ∼ B-14) and 0.624 μm in cluster 3 (B-15 ∼ B-18). There were significant difference among Ra of three clusters.
Ra of B-IM group was decreased 210.72% than Ra of F group. Ra of B-8 group and B-15 group was increased 35.49% and 51.35% respectively than Ra of B-IM group.
On FE-SEM, B-IM group showed the smoothest resin surface. B-8 group and B-15 group showed vertically shallow scratches, and wide and irregular vertical scratches on composite resin surface respectively.

Within a limitation of this study, finished resin surface will be again smooth and glazy if BisCover would be reapplied within 8 to 14 months after applying to resin surface.

Keywords: Abrasion resistance; Resin surface sealant; Toothbrush abrasion test; Surface roughness; Finishing method; Polishing instrument

Figure 1.

Tooth abrasive machine used in this study.

Figure 2.

Histogram for mean surface roughness value and cluster of each group.

F Group (× 500).

B-IM Group (× 500).

B-8 Group (× 500).

B-15 Group (× 500).

B-18 Group (× 500).

Materials used in this study

Table 2.

Group classification by finishing of resin surfaces or/and applying resin sealant on resin surfaces

Table 3.

Mean surface roughness value (Ra) of each group

Table 4.

3-mean cluster analysis among cluster 1, 2, and 3

Table 5.

Paired t-test between Ra of B-IM group and B-1 ~ B-18 groups and Ra of B-8 group and B-9 ~ B-18 groups

Table 6.

Repeated measure ANOVA and increasing rate of Ra among F, B-IM, B-8, and B-15 group

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