The Effects of Thermal Behavior of Refractory Die Material on Adaptation of Porcelain Laminate Veneer and Porcelain Inlay

DOI Web Site 31 References
  • Oota Takashi
    1Division of Pulp Biology, Operative Dentistry and Endodontics, Department of Cariology and Periodontology, Science of Oral Functions, Kyushu Dental College
  • Chen Ker-Kong
    1Division of Pulp Biology, Operative Dentistry and Endodontics, Department of Cariology and Periodontology, Science of Oral Functions, Kyushu Dental College
  • Kakigawa Hiroshi
    Division of Biomaterials, Department of Oral Functional Reconstruction, Science of Oral Functions, Kyushu Dental College
  • Kozono Yoshio
    Division of Biomaterials, Department of Oral Functional Reconstruction, Science of Oral Functions, Kyushu Dental College
  • Terashita Masamichi
    Division of Comprehensive Dentistry, Department of Clinical Communication and Practice, Science of Oral Functions, Kyushu Dental College

Bibliographic Information

Other Title
  • ポーセレン・ラミネートベニアとポーセレン・インレーの適合性に及ぼす耐火模型材の熱的挙動
  • ポーセレン ラミネートベニア ト ポーセレン インレー ノ テキゴウセイ ニ オヨボス タイカ モケイザイ ノ ネツテキ キョドウ

Search this article

Description

The great advances in adhesion for bonding tooth substrate and porcelain and high patient expectations for esthetic appearance have increasingly promoted the use of porcelain laminate veneer and porcelain inlay. Even though these restorations can be fabricated by several methods, the sintering method that fabricates porcelain by the use of refractory die material is popular due to the ease of reproducing delicate tooth colors and morphology to fulfill patients' requirements. This study measured the interfacial gaps in porcelain laminate veneer and porcelain inlay, the thermal expansion curvatures of refractory die material and porcelain and the dimensional changes with repeated firing in order to find out the effects of such thermal behaviors on the adaptation of porcelain restorations.<BR>Two kinds of porcelain sintering systems (Lamina system and G-Cera Cosmotech II system) were used. The P/L ratio of the refractory die material was attained according to the manufacturer's instructions (for inlay, the liquid/water ratio was 1:2 in Lamina system and 3:5 in G-Cera system) to produce porcelain laminate veneer and Class I porcelain inlay. Porcelain inlay produced using the powder/liquid ratio for porcelain laminate veneer was also fabricated for examination.<BR>Regardless of the kinds of refractory die material, it was found that the interfacial gaps in porcelain laminate veneer became greater in the sequence from the middle portion to the marginal edge, while the interfacial gaps in inlay (with or without extra water addition) were in the sequence of the middle of the cavity wall, the marginal edge and the middle of cavity floor. Refractory die material mixed with extra water led to a less gap formation in porcelain inlay. The same pattern of thermal expansion and shrinkage curvation of refractory die material and porcelain during firing indicated that porcelain matched the refractory material to show less deformation or detachment during the firing procedure, which may promote the adaptability of porcelain. The dimensional change of the refractory die material with extra water addition presented a larger shrinkage and smaller thermal curvature as compared with results with the normal P/L ratio. The undesirable marginal adaptation in veneer indicates that some measures are still needed for resolution of the problem. In Class I cavity, the shrinkage from the addition of extra water may facilitate the adaptation of porcelain inlay.

Journal

References(31)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top