Direct Bonding Method に関する研究 : エッチングしたエナメル質の口腔内における経日的変化

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  • Study of the Direct Bonding Method : Morphological Changes of Etched Enamel Surface in Oral Environment
  • Direct Bonding Method ニカンスルケンキュウ エッチングシ

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Recently, the light has been casted on the damage of the enamel in the direct bonding procedure ; one is, in the process of etching, the sound enamel surface is decalcified and dissoluted, and another is, as a result of bracket removal, enamel is removed with adhesive. For the purpose of defining what changes will be brought about on the etched enamel surface in oral environment, the etched enamel of human tooth, which was mounted to the lingual arch, was worn in the mouth of adult male. Its changes were monitored by scanning electron microscope after 10 days and 3 months, comparing with polished surface placed in the same specimen. The results were as follows : 1. The surface roughness of the etched enamel could be seen disappeared, and become almost same as polished smooth surface after 3 months. 2. The depth of enamel dissolution from polished surface to etched one was unchanged. These suggest that the recovery of surface roughness of etched enamel could be expected, but not quantity of dissoluted enamel. Taking these into consideration, as we have previously reported, maleic acid or pyruvic acid is more favorable as an etching agent in the sense that require less enamel dissolution in obtaining sufficient grip for clinical purpose.

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