치아삭제에 따른 유치법랑질의 산부식 양상과 레진전단결합강도에 관한 연구 = A STUDY ON ETCHING PATTERNS OF ENAMEL AND SHEAR BOND STRENGTH OF COMPOSITE RESIN TO ENAMEL ACCORDING TO REDUCTION DEPTH OF PRIMARY ANTERIOR TEETH

다국어 초록 (Multilingual Abstract)

The purpose of this study was to determine the effects of etching time and reduction depth on the etching pattern of primary anterior teeth, and the shear bond strength of composite resin.
The 156 primary upper central incisors and lateral incisors recently exfoliated were used. They were stored in physiologic saline solution till they were prepared for this study.
They were divided into three groups according to reduction depth, and each group was subdivided into four sub-groups according to etching time.
GroupⅠ- Fifty-two teeth were subdivided into 4 groups according to etching time of 15, 30, 50 and 120 seconds.
Enamel of these teeth were not reduced, but only the prophylaxis using pure pumice with rubber cup was performed.
GroupⅡ- Fifty-two teeth were subdivided by the same manner as the group Ⅰ.
Enamel was reduced only enough to remove the prismless layer(approximately 30um in thickness) using an abrasive white stone(Shofu Inc., Japan) and was polished using sand paper strip(#600).
GroupⅢ-Fifty-two teeth were subdivided by the same manner as the group Ⅰ. Enamel was reduced about 0.4-0.5mm using diamond point(Edenta AG Switzerland 877.31.010 FG), and polished using abrasive white stone and sandpaper.
From the each subgroup, tooth, total of 12 teeth, was selected randomly, and then prepared for the SEM. One hundred and forty four teeth were prepared for evaluation of the shear bond strength of composite resin to enamel. The shear bond strength of composite resin bonded to enamel of each specimen was tested with a universal testing machine.
The results were as follows;
1. In all groups, the type 2 etching pattern(by Silverstone), in which the prism cores were left intact and prism peripheries were lost selectively, was observed.
2. The effective etching time was 60 seconds in group Ⅰ and 30 seconds in group Ⅱ(p<0.05).
3. In group Ⅲ, there was no significant difference in etching pattern according to etching time.
4. In the cases of which etching time was 15 and 30 seconds, the shear bond strength was greater in group Ⅰ than in group Ⅱ and Ⅲ(p<0.05), however in the cases of which etching time was 60 and 120 seconds, there was no significant difference among three groups.

목차 (Table of Contents)

• Ⅰ. 서 론
• Ⅱ. 실험재료 및 방법
• Ⅲ. 실험성적
• Ⅳ. 총괄 및 고찰
• Ⅴ. 결 론
• 참고문헌
• 사진부도
• 영문초록