수종의 교정용 브라켓 접착 레진의 전단 강도 평가
Evaluation of Shear Bond Strength of Various Orthodontic Bracket Bonding Agents
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초록
치과에서 사용하는 재료들의 물성의 발달로 인하여 브라켓과 치아 사이의 결합 능력도 크게 향상되었다. 그러나 소아치과 영역에서와 같이 환자의 협조를 기대하기 어렵거나, 수분 격리가 제대로 이루어지지 않을 경우 기대하는 효과에 미치지 못하는 결합강도를 보여줄 수 있다. 본 연구의 목적은 세 가지의 접착 술식을 비교하여 브라켓의 전단 접착 강도를 평가하고, 임상적으로 유의한 차이가 존재하는지 비교하는 것이다. 우식증이나 수복물이 없는 상, 하악 소구치 60개 치아를 대상으로 하였다. Group I은 대조군으로서 기존의 3 step 접착 방식에 따라 브라켓을 부착하였고, Group II는 self-etching primer system을 이용하여 부착하였다. Group III는 self-priming adhesive를 이용하여 브라켓을 부착하였다. 각 group의 전단 결합 강도를 측정하고 접착제 잔류지수(ARI)를 기록하였다. 각 group I, II, III의 평균 전단 결합 강도는 14.69 MPa, 11.21 MPa 그리고 12.21 MPa로 측정되었다. Group I과 II, group I과 III에서만 유의한 차이가 존재하였으며(p < 0.05), ARI 값은 모든 group에서 유의한 차이가 존재하지 않았다.
Abstract
Due to the development of properties of adhesive materials currently used in dentistry, the bonding ability between the brackets and the tooth enamel has been greatly improved. In general, in situations where cooperation can be obtained, adhesion of the orthodontic bracket through the conventional three-step process can show excellent bonding strength. However, if it is difficult to expect patient cooperation, as in the pediatric dentistry area, or if moisture isolation is not properly performed, the binding strength that does not reach the expected effect. As a result, various products that simplify the process for adhesion are being developed. The aim of this study was to evaluate and compare the shear bonding strength between the conventional 3-step adhesion system, self-etching primer system and one-step adhesion system that reduces the priming process. A total of 60 human maxillary, mandibular premolars were prepared. Group I (control group) were followed conventional 3-step bonding process. Group II were conditioned with self-etching primer. Group III were etched with 37% phosphoric acid and brackets were bonded with self-priming adhesive. The resultant shear bond strength of each group was measured and an adhesive remnant index (ARI) was recorded. The mean shear bond strength of group I, II, III were 14.69 MPa, 11.21 MPa and 12.21 MPa respectively. Significant differences could only be found between group I, II and group I, III (p < 0.05). The ARI indicated no significant difference among all groups.
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