The korean journal of orthodontics (대한치과교정학회지)

The Korean Association Of Orthodontists (대한치과교정학회)
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A Study of shear bond strength of bonded retainer according to the bonding method and type of wires

접착방법 및 multistranded wire의 종류에 따른 접착식 보정장치의 전단접착강도에 관한 연구

  • Lee, Hyoung-Cheol (Department of Orthodontics, College of Dentistry, Pusan National University) ;
  • Son, Woo-Sung (Department of Orthodontics, College of Dentistry, Pusan National University)
  • 이형철 (부산대학교 치과대학 교정학교실) ;
  • 손우성 (부산대학교 치과대학 교정학교실)
  • Published : 2002.04.30
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Abstract

The bonded orthodontic retainer constructed from composite and multistrand orthodontic wire provides an esthetic and efficient system for maintained retention. This study was designed to measure shear bond strength of bonded retainers and to suggest a optimal combination of a multistrand wire and bonding method used when bonded retainer was fabricated. 160 sound maxillary and mandibular premolars were used for 80 test samples. After Uniformizing bonding area, length of wire, and thickness of composite, multistrand wire was bonded to fabricated a bonded retainer by direct or indirect bonding method. Shear bond strength and extension length of each sample were measured by a universal testing machine. The results of this study were as follows : 1. In vitro shear bond testing found 6-stranded, 0.0155 inch wires to have the largest shear bond strength and 3-stranded, 0.0195 inch wires to have the least shear bond strength. But, These difference was not statistically significant(p<0.05). 2. In vitro extension testing found 3-stranded, 0.0155 inch wires to have the largest extension length and 3-stranded, 0.0195 inch wires to have the least extension length(p<0.05). The larger diameter wire was used, the larger extension length was shown. But, the strand of wire is not related to the extension length of wire. 3. In comparison with direct bonding method, larger shear bond strength and extension length was shown in indirect bonding method(p<0.05).

콤포지트와 여러가닥 강선을 사용하여 제작된 접착식 보정장치는 심미적이며, 효과적인 보정장치라 할 수 있다. 이 연구는 접착식 보정장치의 전단접착강도를 측정하고, 접착식 보정장치의 제작 시 사용하는 여러가닥 강선 및 접착방법의 이상적인 조합을 제시하기 위해 디자인되었다. 교정치료를 위해 발거한 건전한 상하악 소구치 160개를 사용하여 80개의 시편을 제작하였다. 접착면적 및 강선의 길이, 콤포지트의 두께를 동일화하고, 직접접착 및 간접접착의 방법으로 여러가닥 강선을 접착하여 접착식 보정장치를 제작하였다. 만능시험기를 사용하여 각 시편에서의 전단접착강도 및 강선의 탈락시까지의 신장량을 측정하여, 다음과 같은 결론을 얻었다. 1. 6가닥, 0.0155인치의 강선에서 가장 큰 최대 접착강도를 보이고, 3가닥, 0.0195인치의 강선에서 가장 작은 최대 접착강도를 보였는데, 그 차이는 유의할 만큼 크지 않았다(p<0.05). 즉 강선의 직경 및 가닥수는 접착강도와 큰 연관성이 없다. 2. 3가닥, 0.015인치의 강선에서 가장 큰 신장량을 보여 주었고, 3가닥, 0.0195인치 강선에서 가장 작은 신장량을 보여주었다(p<0.05). 강선의 직경이 작을수록 신장량은 크게 나타났으나, 강선의 가닥수는 신장량과 큰 연관성이 없다. 3. 두 가지 접착방법의 비교에서 간접 접착술식을 사용했을 때 더 큰 접착강도 및 신장량을 보여 주었고, 통계적으로 유의한 차이를 나타냈다(p<0.05).

Keywords

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