下顎切歯におけるバイオCシーラーを用いたシングルコーン法と温間垂直圧縮法の破折抵抗性の比較。研究

Comparison of Fracture Resistance between Single-cone and Warm Vertical Compaction Technique Using Bio-C Sealer in Mandibular Incisors: An Study.

抄録

目的:

本研究の目的は，下顎切歯において Bio-C sealer® を用いて Single-cone technique と Warm Vertical Compaction technique (WVCT) を行い，万能試験機 (Instron 5943; Instron, Norwood, Massachusetts, USA) で圧縮力をかけ，その破壊抵抗力を比較検討することである．

AIM: The aim of the study was to compare the fracture resistance of the single-cone technique with the warm vertical compaction technique (WVCT) in mandibular incisors using Bio-C sealer®, by applying a compressive force using a universal testing machine (UTM) (Instron 5943; Instron, Norwood, Massachusetts, USA).

材料と方法:

22本の下顎切歯を選択し，同じシェーピングプロトコルを適用した後，2群に分けた．wave vertical compaction techniqueが破折抵抗に及ぼす影響を評価するため，第1グループはsingle-cone obturation technique（SCOT）（＝12）で，第2グループはWVCT（＝10）でオブチュレーションを施した．Bio-C sealer® (Angelus, Hague Netherlands)を2つのオブチュレーションテクニックで使用した．ワックスコーティングされた歯根をアクリル型に入れ、機械的材料試験機（UTM）（Instron 5943; Instron, Norwood, Massachusetts, USA）で圧縮強度破壊まで負荷をかけ、Bluehill 3 ソフトウェア（バージョン 3.15.1343）で破壊時の最大荷重を記録した。破壊荷重は統計的に比較され，データはMann-Whitney検定で調べられ，有意水準は≤0.05に設定された．

MATERIALS AND METHODS: Twenty-two mandibular incisors were selected and divided into two groups after applying the same shaping protocol. To assess the influence of the wave vertical compaction technique on the fracture resistance, the first group was obturated by a single-cone obturation technique (SCOT) ( = 12), and the second group was obturated with a WVCT ( = 10). Bio-C sealer® (Angelus, Hague Netherlands) was used in the two obturation techniques. Wax-coated roots were put in an acrylic mold and loaded to compressive strength fracture in a mechanical material testing machine (UTM) (Instron 5943; Instron, Norwood, Massachusetts, USA), with Bluehill 3 software (version 3.15.1343) recording the maximum load at fracture. Fracture loads were compared statistically, and data were examined with the Mann-Whitney test with a level of significance set at ≤0.05.

結果:

SCOT（264.97 ± 83.975 N）とWVCT（313.35±89.149N）の間に歯内療法を行った下顎切歯の破折抵抗に関する統計的有意差は認められなかった（= 0.159 ）．

RESULTS: No statistically significant difference was registered between the SCOT (264.97 ± 83.975 N) and WVCT (313.35 ± 89.149 N) concerning the endodontically treated mandibular incisors' fracture resistance ( = 0.159).

結論:

WVCTはSCOTと比較して，歯内療法を行った下顎切歯の破折抵抗に影響を与えなかった．

CONCLUSION: Warm vertical compaction technique (WVCT) did not affect the fracture resistance of endodontically treated mandibular incisors when compared to SCOT canal preparation.

臨床的意義:

一般開業医と歯内療法専門医は、根管治療中に亀裂や歯根破折などの課題に直面する。本稿では，根管充填の長期的な品質向上を目指して，シングルコーン法と連続式WVCT法を選択する際の専門家の指針を示すことを目的とする．

CLINICAL SIGNIFICANCE: General practitioners and endodontists face challenges during root canal treatment such as cracks and root fractures. This article aims to guide experts in choosing between the single-cone and the continuous WVCT aiming for higher long-term quality of root canal filling.