ジルコニアオールセラミッククラウンの臨床的な周縁部と内部の隙間。

Clinical marginal and internal gaps of zirconia all-ceramic crowns.

• Yuji Kokubo
• Mitsuyoshi Tsumita
• Takamitsu Kano
• Satoe Sakurai
• Shunji Fukushima

抄録

目的:

ノーベルプロセラクラウンジルコニアの限界隙間と内部隙間をシリコーン材料を用いて臨床的に評価しました。

PURPOSE: Marginal and internal gaps of NobelProcera crown zirconia were clinically evaluated using silicone materials.

材料および方法:

最終的なセメント化の前に91本のクラウンを検査し，白と黒のシリコーン材料を使用して，マージンと内部のフィット感を記録した．シリコーン材料を舌側と舌側で切除し、顕微鏡を用いてシリコーン層の厚さを測定した。各試験片について16点の基準点を測定し、平均余白と内部の隙間を求めた。前歯群，前臼歯群，大臼歯群間の平均隙間を，各群内の基準点における平均隙間に加えて，二元配置ANOVAおよびGames-Howell分析を用いて比較した．

MATERIALS AND METHODS: Ninety-one crowns were examined before final cementation, and white and black silicone materials were used to record the marginal and internal fit. The silicone materials were sectioned bucco-lingually and mesio-distally, and the thickness of the silicone layers was measured using a microscope. Sixteen reference points were measured on each specimen, and mean marginal and internal gaps were obtained. Mean marginal gaps among anterior, premolar, and molar tooth groups, in addition to mean gaps at the reference points within the groups, were compared using two-way ANOVA and Games-Howell analysis.

結果:

限界平均値は全歯群の中で最も小さく，最も大きかったのは丸みを帯びた肩の部分であった．3つの歯群の間には有意差はなかったが、各歯群のマージン平均値と内部ギャップには有意差があった。

RESULTS: The marginal mean values were the smallest among all tooth groups, and the largest were at the rounded shoulders. There were no significant differences in the mean marginal gaps among the three tooth groups, while there were significant differences in the mean marginal and internal gaps of each tooth group.

結論:

ノーベルプロセラクラウンジルコニアの平均隙間は44.2μmであり，臨床的に認められた基準の範囲内であった．

CONCLUSIONS: The mean marginal gap of the NobelProcera crown zirconia was 44.2 μm, which is within clinically accepted standards.

Copyright © 2010 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.