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2つの異なるLEDモードを用いて、異なるレイヤリング技術で修復された2つの歯周補綴物間のマイクロリークのインビトロ比較
An In-Vitro Comparison of Micro Leakage Between Two Posterior Composites Restored with Different Layering Techniques Using Two Different LED Modes.
PMID: 26155569 PMCID: PMC4484161. DOI: 10.7860/JCDR/2015/12782.5961.
抄録
AIM:
AIM: Composite resins have undergone various advances since their introduction, but their polymerization shrinkage remains a problem. Shrinkage can cause debonding of the restoration and can contribute to postoperative sensitivity, secondary caries, marginal staining and eventual failure of the restoration. So, our aim is to compare the effect of two different placement techniques and two different curing modes in reducing the marginal microleakage of two different composites in Class II cavities, where oblique and horizontal placement techniques and ramp & pulse curing modes of LED are used during the restoration.
材料と方法:
ヒトの多根歯80本に標準化されたスロットプレパレーションを作成した。これらの歯を無作為に4つのグループに分けた。グループAとB：Filtek P60 (3M, ESPE)、グループCとD：Filtek P90 (3M, ESPE)で修復した。すべてのグループは、配置技術および硬化モードに基づいて、さらにサブグループに分割された。サンプルを蒸留水に保存し、次いで熱サイクルを行い、２％メチレンブルーに浸漬した。サンプルを切片化し、光学実体顕微鏡を用いて歯肉縁部のマイクロリーケージを評価した。
MATERIALS AND METHODS: Standardized slot preparations were prepared in 80 human multi-rooted teeth. The teeth were randomly divided into four groups. Group A and B: Restored with Filtek P60 (3M, ESPE), Group C and D: Restored with Filtek P90 (3M, ESPE). All groups were further divided into sub-groups on basis of placement technique and curing mode. The samples were stored in distilled water, followed by thermocycling and immersed in 2% methylene blue. The samples were sectioned and evaluated for microleakage at the gingival margin with an optical stereomicroscope.
結果:
P60コンポジットを斜めインクリメンタル法でキャビティ内に配置し，LEDのランプモードで硬化させた場合の平均マイクロリーケージは，最も高い値を示した．また、水平埋入法と斜め埋入法の間には有意な差はなく（p=0.80）、パルス硬化法とランプ硬化法の間には有意な差はなかった（p=0.62）。
RESULTS: P60 composite when placed in the cavity with oblique incremental technique and cured with ramp mode of LED showed highest mean microleakage. There is no significant difference between horizontal and oblique placement technique (p=0.80); Pulse-curing and the ramp-curing mode (p=0.62).
結論:
深部II級虫歯の修復においては，限界マイクロリーケージの問題を克服するために，斜め配置法とLEDのランプキュアモードを用いた低収縮性コンポジット材の使用が推奨される．
CONCLUSION: In restoring deep class II cavities, the use of a low-shrink composite with the oblique placement technique and ramp curing mode of LED is recommended to overcome the problem of marginal microleakage.