3가지 방법으로 브라켓을 재생후 재접착하였을 때 임상적으로 인장접착강도가 충분한지를 알아보기 위해 새 브라켓을 접착하였을 때의 인장접착강도와 비교한 결과 다음과 같은 결론을 얻었다. ㆍ 네 군 간에는 통계학적으로 유의성은 없었으나 새 브라켓을 접착한 군(제1군)이 9.09±1.58 MPa로 가장 높은 인장접착강도를 나타내었고, 95% 황산으로 재생한 군(제3군)이 8.74±1.18 MPa, 열처리하여 재생한 군(제2군)이 8.48±0.79 MPa 순이었으며 샌드블라스터로 재생한 군(제4군)이 8.05±0.88 MPa로 가장 낮은 인장접착강도를 나타내었다. ㆍ 브라켓 탈락양상은 접착제가 치아와 브라켓에 부분적으로 붙어서 떨어진 것과 치아에만 붙어서 떨어진 것이 제1군에서 각각 40%, 40%, 제3군에서는 각각 46.6%, 46.6%로 동일한 양상을 나타내었으나 제2군에서는 각각 46.6%, 53.3%, 제4군에서는 각각 40%, 53.3%로 나타났다. ㆍ ...
3가지 방법으로 브라켓을 재생후 재접착하였을 때 임상적으로 인장접착강도가 충분한지를 알아보기 위해 새 브라켓을 접착하였을 때의 인장접착강도와 비교한 결과 다음과 같은 결론을 얻었다. ㆍ 네 군 간에는 통계학적으로 유의성은 없었으나 새 브라켓을 접착한 군(제1군)이 9.09±1.58 MPa로 가장 높은 인장접착강도를 나타내었고, 95% 황산으로 재생한 군(제3군)이 8.74±1.18 MPa, 열처리하여 재생한 군(제2군)이 8.48±0.79 MPa 순이었으며 샌드블라스터로 재생한 군(제4군)이 8.05±0.88 MPa로 가장 낮은 인장접착강도를 나타내었다. ㆍ 브라켓 탈락양상은 접착제가 치아와 브라켓에 부분적으로 붙어서 떨어진 것과 치아에만 붙어서 떨어진 것이 제1군에서 각각 40%, 40%, 제3군에서는 각각 46.6%, 46.6%로 동일한 양상을 나타내었으나 제2군에서는 각각 46.6%, 53.3%, 제4군에서는 각각 40%, 53.3%로 나타났다. ㆍ 주사전자현미경 관찰에서 제1군과 제3군 사이에는 별 차이가 없었으나 제4군에서는 나머지 군에 비해 많은 요철구조가 나타났고 제2군에서는 제1군과 제3군에서보다 더 거친 브라켓 기저부가 관찰되었다.
3가지 방법으로 브라켓을 재생후 재접착하였을 때 임상적으로 인장접착강도가 충분한지를 알아보기 위해 새 브라켓을 접착하였을 때의 인장접착강도와 비교한 결과 다음과 같은 결론을 얻었다. ㆍ 네 군 간에는 통계학적으로 유의성은 없었으나 새 브라켓을 접착한 군(제1군)이 9.09±1.58 MPa로 가장 높은 인장접착강도를 나타내었고, 95% 황산으로 재생한 군(제3군)이 8.74±1.18 MPa, 열처리하여 재생한 군(제2군)이 8.48±0.79 MPa 순이었으며 샌드블라스터로 재생한 군(제4군)이 8.05±0.88 MPa로 가장 낮은 인장접착강도를 나타내었다. ㆍ 브라켓 탈락양상은 접착제가 치아와 브라켓에 부분적으로 붙어서 떨어진 것과 치아에만 붙어서 떨어진 것이 제1군에서 각각 40%, 40%, 제3군에서는 각각 46.6%, 46.6%로 동일한 양상을 나타내었으나 제2군에서는 각각 46.6%, 53.3%, 제4군에서는 각각 40%, 53.3%로 나타났다. ㆍ 주사전자현미경 관찰에서 제1군과 제3군 사이에는 별 차이가 없었으나 제4군에서는 나머지 군에 비해 많은 요철구조가 나타났고 제2군에서는 제1군과 제3군에서보다 더 거친 브라켓 기저부가 관찰되었다.
The main object of bracket recycling means to completely remove adhesives from bracket without deterioration or damage on bracket width or the fine surface structure. This study aims at finding the effect of the recycling method on the tensile bond strength. To satisfy the intended object, experimen...
The main object of bracket recycling means to completely remove adhesives from bracket without deterioration or damage on bracket width or the fine surface structure. This study aims at finding the effect of the recycling method on the tensile bond strength. To satisfy the intended object, experiment was carried out on 60 premolars by dividing them into 4 groups, each with 15. - (G1) Group : Group adhered with new brackets. - (G2) Group : Group adhered with the recycled bracket by the esmadent method following adherence of the new bracket and debonding. - (G3) Group : Group adhered with the bracket recycled with 95% hydrosulfonic acid following adherence of the new bracket and debonding. - (G4) Group : Group readhered with the bracket recycled with sandblasting following adherence of the new bracket and debonding. Left for one hour in the room temperature for complete setting of resin they were kept in 0.9% normal saline to be in 37℃ for 24 hours. The brackets of G2, G3 and G4 groups were removed with a debracketing plier, to be recycled by the method appropriate to each group and adhered to 45 premolars using the same method as before. Then the tensile bond strength was measured with the instron universal testing machine. Typical debonded bracket bases of the four groups were observed with the scanning electron microscope. The following are the results: - There was no significant difference in the tensile bond strength of the four groups(P>0.05), but the findings were in such order as : G1 group, 9.09±1.58 Mpa,: G3 group, 8.74±1.18 Mpa: G2 group, 8.48±0.79 Mpa: G4 group, 8.05±0.88 Mpa. - For failure pattern of bracket, those with adhesive partially bonded to the teeth and bracket and only to the teeth are: G1 group, 40%, 40%; G3 group, 46.6%, 46.6%- the same. But in G2 group, 46.6%, 53.3%; G4 group, 40%, 53.3%. In scanning electron microscope observation, there was no difference between G1 and G3 groupes, but G4 group showed relatively many microscopic undercuts compared with the rest groups. G2 group showed a rougher bracket base than G3 group.
The main object of bracket recycling means to completely remove adhesives from bracket without deterioration or damage on bracket width or the fine surface structure. This study aims at finding the effect of the recycling method on the tensile bond strength. To satisfy the intended object, experiment was carried out on 60 premolars by dividing them into 4 groups, each with 15. - (G1) Group : Group adhered with new brackets. - (G2) Group : Group adhered with the recycled bracket by the esmadent method following adherence of the new bracket and debonding. - (G3) Group : Group adhered with the bracket recycled with 95% hydrosulfonic acid following adherence of the new bracket and debonding. - (G4) Group : Group readhered with the bracket recycled with sandblasting following adherence of the new bracket and debonding. Left for one hour in the room temperature for complete setting of resin they were kept in 0.9% normal saline to be in 37℃ for 24 hours. The brackets of G2, G3 and G4 groups were removed with a debracketing plier, to be recycled by the method appropriate to each group and adhered to 45 premolars using the same method as before. Then the tensile bond strength was measured with the instron universal testing machine. Typical debonded bracket bases of the four groups were observed with the scanning electron microscope. The following are the results: - There was no significant difference in the tensile bond strength of the four groups(P>0.05), but the findings were in such order as : G1 group, 9.09±1.58 Mpa,: G3 group, 8.74±1.18 Mpa: G2 group, 8.48±0.79 Mpa: G4 group, 8.05±0.88 Mpa. - For failure pattern of bracket, those with adhesive partially bonded to the teeth and bracket and only to the teeth are: G1 group, 40%, 40%; G3 group, 46.6%, 46.6%- the same. But in G2 group, 46.6%, 53.3%; G4 group, 40%, 53.3%. In scanning electron microscope observation, there was no difference between G1 and G3 groupes, but G4 group showed relatively many microscopic undercuts compared with the rest groups. G2 group showed a rougher bracket base than G3 group.
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