자가부식 프라이머 접착제의 적용시간이 법랑질 접착에 미치는 영향

Abstract

The purpose of this study was to compare the normal and two times of application time of six self-etching primers applied to enamel using microshear bond strength (uSBS) and the finding of SEM. Crown of sixty human molars were bisected mesiodistally and partially exposed buccal and lingual enamel of crowns with Isomet Low Speed Saw and slabs of 1.2 mm thick were made and polished with 600 grit SiC papers.· They were divided into one of two equal groups by norml and two times of application time of self-etching primers applied to enamel surfaces and subdivided into one of six equal groups (n=10) by self-etching primer adhesives. Groups applied self-etch primers to enamel for normal time were TY group : Tyrian SPE (20 s), AD group : AdheSE Primer (15 s), OP group : OptiBond Solo Plus Self-Etch Primer (15 s), CL group : Clearfil SE Primer (20 s), UN group : Unifil Bond Self-Etch Primer (20 s), and CO group : Contax-Primer (20 s). Groups applied self-etch primers to enamel for two times were coded by adding -2 to each group. TY-2 group : Tyrian SPE (40 s), AD-2 group : AdheSE Primer (30 s), OP-2 group : OptiBond Solo Plus Self-Etch Primer (30 s), CL-2 group : Clearfil SE Primer (40 s), UN-2 group : Unifil Bond Self-Etch Primer (40 s), and CO-2 group : Contax-Primer (40 s). After enamel surfaces were treated with six primers for normal and two times of application time, and applied with each bonding resin, same manufacture's composite were bonded to enamel surface using Tygon tubes. After storage in distilled water for 24 hours, the bonded specimens were subjected to uSBS testing with a crosshead speed of 1 mm/min. The mean uSBS (n=20 for each group) was statistically compared using two-way ANOVA, one-way ANOVA and Tukey HSD test, and independent t-test. Also crown of six human molars were used. After flatten buccal and lingual enamel surfaces of crowns were treated with six primers as same as above groups, same manufacture's composite was bonded to enamel surface. After storing in distilled water for 24h, the specimens were vertically bisected. SEM observation was made in interface of enamel and resin. The results of this study were as follows; 1. The uSBS for groups treated with two times of application time of self-etching primers was higher than those for groups treated with normal application time except for OP group and OP-2 group. 2. There was no significant difference between uSBS of TY group/ TY-2 group, AD group/AD-2 group, and OP group/OP-2 group, respectively (p > 0.05). 3. The uSBS for CL-2 group, UN-2 group, CO-2 group was significantly higher than that for CL group, UN group, CO group, respectively (p < 0.05). 4. Whether self-etching primers was applied with normal or two times of application time, interface of enamel and resin in all group showed close adaptation. In conclusion, generally two times of primer application time increased the enamel uSBS in self-etching primer adhesives, especially with the statistical increase of bond strength in adhesives involving high-pH primers.