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"バタフライ効果"と根尖歯列の方向性との関係
"BUTTERFLY EFFECT" AND IT'S CORRELATION TO THE DIRECTION OF FRACTURE LINE IN ROOT DENTIN.
PMID: 33556423 DOI: 10.1016/j.joen.2021.01.011.
抄録
はじめに:
バタフライ効果は光学現象であり、根の硬化性象牙質の存在に関連しています。硬化性象牙質形成の独特なパターンは、根の横断面に特徴的な蝶の形を作り出す。本研究の目的は，バタフライ効果を示す根の破断線の方向を評価することであった．
INTRODUCTION: The butterfly effect is an optical phenomenon and is related to the presence of sclerotic dentin in the roots. The unique pattern of sclerotic dentin formation produces a characteristic butterfly shape in transverse sections of the roots. The objective of this study was to evaluate the direction of the fracture line in roots which exhibits the butterfly effect.
方法:
楕円形の単根の前歯30本をデコレーションし、アクリルブロックに埋め込み、万能試験機（HPBSD, TECSOL INDIA, Chennai, India）の下で垂直方向の力を加えた。破断した根を実体顕微鏡（Model no.080772、Lawrence and Mayo、米国）で×10倍の倍率で検査し、破断線の位置および方向を決定した。硬化性象牙質の方向と破折線の方向との間の相関関係を評価するために、歯を断面化し、×20および×40倍の倍率で実体顕微鏡下で観察した。相関関係は、フィッシャーの厳密検定を用いて分析した（P値：冠状および先端3分の1で<0.05、中3分の1で>0.05）。
METHODS: 30 single-rooted premolars with oval shaped roots were decoronated and embedded in acrylic blocks and subjected to vertical force under a Universal Testing Machine (HPBSD, TECSOL INDIA, Chennai, India). Fractured roots were examined under the Stereomicroscope (Model no. 080772, Lawrence and Mayo, USA) at ×10 magnification to determine the location and direction of the fracture line. To evaluate the correlation between the direction of sclerotic dentin and the direction of the fracture line, teeth were sectioned and observed under a Stereomicroscope at ×20 and ×40 magnification. The correlation was analyzed using Fisher's exact test (P-value: <0.05 for coronal and apical third, >0.05 for middle third).
結果:
硬化象牙質は根の先端部で多く観察され，根の冠状3分の1では少なかった．硬化象牙質の方向と破折線の方向との相関は、根の冠状部と先端部で統計的に有意であった。
RESULTS: Sclerotic dentin was observed more in the apical area and less in the coronal third of the root. The correlation between the direction of sclerotic dentin and the direction of the fracture line was statistically significant in the coronal and apical third of the root.
結論:
ブコリング状に走る垂直根破折は、中骨方向に存在する硬い硬化性象牙質と相関しています。
CONCLUSIONS: The vertical root fracture that runs buccolingually, is correlated to the harder sclerotic dentin present in the mesiodistal direction.
Copyright © 2021. Published by Elsevier Inc.