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Comparative Evaluation of Factors Minimizing the Amount of Needle Deflection during Inferior Alveolar Nerve Block-An in Vitro Study
並列摘要
Failure of local anaesthesia is a common problem faced in the clinical practice. Inferior alveolar nerve block is showing high percentage of failure among the local anaesthesia techniques. The study is conducted to understand the factors minimising the amount of needle deflection during the inferior alveolar nerve block.Successful local anaesthesia has been critical to the daily practice of dentistry. It is required to ensure maximum patient comfort while clinical procedures are being performed. The main objective of the study is to assess various factors affecting the deflection of the needle while giving inferior alveolar nerve block anaesthesia in a tissue like material agar-agar having almost similar physical properties to human tissues.This study was conducted to investigate the cause-and-effect relationship between many factors (needle gauge, tip design, angle of insertion, insertion technique and thickness of tissue) and amount of needle deflection during inferior alveolar nerve block.The study was conducted with fourteen in vitro deflection test models ( 2.5 x 2 x 2 cm ) using tissue like substance ( reversible hydrocolloid ) mounted on a dental surveyor for standardized needle insertions to standardized depth of 25 mm and radiographic analysis was performed after each insertion by measuring the vertical deflection in millimetres (to the nearest 1/10th mm). We used the one-way ANOVA procedure with multiple comparisons.The present study indicates that tip of needle design, technique of insertion and thickness of tissue can significantly affect the deflection of the needle while factor like angle of insertion of the needle has the least effect on amount of deflection.The present report indicates that thickness of the tissue and gauge of needle has significant effect on the amount of needle deflection. At the same time, bi-bevelled needle tip and rotational insertion technique provide minimum amount of deflection. Angle of insertion has the least effect on amount of deflection.
延伸閱讀
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