A Study on airbrasive with new powder

Objectives: It was not necessary to consider the cavity form of resin composite because its adhesion to dentin improved today. Therefore, a laser and an airbrasive apparatus are used for removing caries lesion. Abrasion method with a powder injection type device is superior in dentin ability to grind, and potency of clinical application is reported as one of analgesia cavity restoration, however, it has the problem of powder scattering in a dental office. Therefore, harmless powder becomes necessary for a human body. From such a point of view, we found harmless powder newly and applied it in this study. Methods:Bovine teeth ground and flattened with abrasive paper #1,000 were used in order to measure the abraded depth. The used powder was S-01 (Sodium Sulfite, food additive) that was considered harmless for human body or alumina, and let the dentin surface jet it with Painless-Jet (Yoshida). The average of both particle size of 27µm were used. The impression of abraded dentin surface was taken with silicone impression material (EXAHIFLEX GC), and the depth was measured with laser measuring instrument (LE-4000 KEYENCE). Significant differences were determined by t-test (P<0.05). Result:The abraded depth of alumina showed 1,244±154µm and of S-01 showed 875±96µm with 10 times of power injection. Conclusions: Dentin abrasion ability of S-01 (Sodium Sulfite) was significantly lower than alumina, but we thought that it was useful in restorative procedure when we thought about influence to human body. Furthermore, when we used S-01, we could control the abraded depth of dentin. Supported by A Grant from the Ministry of Education, Culture, Sports, Science, and Technology to promote multi-disciplinary research projects.