自動pHサイクル装置を用いた歯冠修復材料の脱灰抑制の影響

automatic pH-cycling system

北海道歯学会

北海道歯学雑誌

Fluoride is known to be effective for prevention of dental caries by strengthening enamel. Fluoride releasing materials were expected as prevention for secondary caries. The purpose of this study is to evaluate the inhibitory effects of the restorative materials and fluoride treatment using an automatic pH-cycling system. In this study, we used the following three restorative materials ; Z100 (3M ESPE, USA), BEAUTIFIL Ⅱ (BF : Shofu, Tokyo), FUJI IX GP EXTRA CAPSULE (Fuji IX, GC, Tokyo). Extracted non-caries human molars were used. The specimens were filled with each material, and all specimens were repeated demineralization and remineralization using the automatic pH-cycling system for 1 to 4 weeks. Specimens were treated for 5 minutes every day with 18.4 mM NaF solution. Every each week, Δintegrated mineral loss (ΔIML) of the specimens was calculated from transverse microradiography images. Also, materials blocks immersed in demineralized solution for 1 to 4 weeks, and released elements from materials blocks were determined in demineralized solution. As a result, ΔIML of BF and FujiIX in which with and without fluoride treatment were significantly smaller than that of Z100 in 2 to 4 weeks. The significant difference was not recognized between BF and Fuji IX. The elements releasing from materials blocks, fluorine and strontium were measured from the BF and FujiIX , Fuji IX were released much these ions than the other materials. Z100 released no ions. In conclusion, ΔIML was reduced in ion releasing materials group, and it was suggested that the surface properties of the enamel was improved.