矯正用レジン改良型グラスアイオノマーセメントの接着強さ
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概要
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The orthodontic bonding characteristics were evaluated for the two types of orthodontic resin-modified glassionomer cements involving a chemical-activating cement (Fuji Ortho, GC) and a light-activating cement (Fuji Ortho LC, GC). Plastic, metal and ceramic brackets having individual irregularities for mechanical retention at their basal planes were bonded to tooth enamel with each of the cements. Their bond strengths were examined by means of shear and tensile tests and the fracture surfaces were also observed. The results obtained were as follows.1. Both the cements showed no or little bonding to plastic bracket.2. The bond strength between metal bracket and enamel was around 6 MPa in shear test and 5.5 MPa in tensile test. The fracture mode was cohesive failure in the cement, adhesive failure at the enamel-cement interface or their mixture.3. When ceramic bracket was used, the tensile bond strength was significantly (p<0.05) larger than that of metal bracket showing complicatedly mixed fracture mode although there was no significant difference in shear bond strength between them. It suggests that the ceramic bracket may be favorable for tensile force bearing use.4. In rebonding the surface retreatment with polyacrylic acid solution seemed to be one of the means effective for bonding.5. There were little significant differences in bonding characteristics between the chemical- and light-activating cements used.The foregoing results indicate that the resin-modified glassionomer cements may be desirable for orthodontic use on account of their reasonable bond strength satisfying the proposed values in service and rebonding so long as the proper bracket is selected.
- 九州歯科学会の論文
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