Kazushige Kawahara

A Study on Repair Restoration with High Filler Containing Indirect Composites-Surface Treatment for Light Cured Type Resins-

目的: 光重合タイプの高フィラー型硬質レジンの補修時における有効な表面処理方法を知ることを目的とした.方法: ArtglassおよびGradia (エナメル色ペーストAEおよびGE, デンチン色ペーストADおよびGD) を用い, 製造者指示に従い重合した被着体 (2×2×12.5mm) に, 処理なし (NT), シラン処理 (S), ボンディング処理 (B), シラン処理とボンディング処理を併用 (SB) の4条件で表面処理を行った.追加築盛は, 直接法および間接法のそれぞれで, 製造者指示の補修用レジンを用いて曲げ接着試験用試験体 (2×2×25mm) を重合して作製した.試験体は, 37℃ で24時間水中保管後に3点曲げ試験を行い, 曲げ接着強さを得た.結果: 被着体AEは直接法ではSB>S>B>NT, 間接法ではSB≧S>B>NTの順で, 被着体ADは直接法および間接法の両者で, SB>S>B>NTの順で有意に大きな曲げ接着強さを示した.一方, 被着体GEは, 直接法ではSB>B≧S>NT, 間接法ではSB≧S≧B>NTの順で, 被着体GDは, 直接法ではSB≧B>S>NT, 間接法ではSB≧B≧S>NTの順で有意に大きな曲げ接着強さを示した.結論: 最適な表面処理は, AEが直接法でSB, 間接法でSBおよびS, ADが直接法および間接法の両者でSB, GEが直接法ではSB, GDがSBおよびB, GEおよびGDともに間接法ではS, BおよびSBであった.

Chromatic Study of IPS Empress. The Effect of Various Adhesive Resin Cements on Layering Technique.

IPS Empress® is an all-ceramic crown system which provides a color tone and light transmittance resembling those of natural teeth. However, because of the translucency of all-ceramic crowns, the color of the adhesive resin cements and the abutment teeth can affect the color of the final crowns.This study examined the effects of IPS Empress® on the layering technique and color of the adhesive resin cements on various background color by comparison and examination.The color difference from the standard color was calculated, and it was judged to have color appearance when ΔE*ab≤2.0.The conclusions were as follows:1. For A 2 background, the color appearance to standard color were obtained using translucent type cements VW and VB (Variolink).2. For Au background, the color appearance to standard color were all of translucent type cements, while for Pd background, opaque type cements YO (Variolink) insertion with better color appearance.3. For H background, using translucent type cements Tr (LA cement) containing dentin color tone and opaque type cements VO (Variolink) with lower values of lightness yielded ΔE*ab≤2.0 with color appearance.The above results suggested that appropriate intermediate cements used in the layering techniqueof IPS Empress® decrease the influence of the background color, achieving a color tone approximating the target color.