现在介绍两种根管治疗中的实用工具。 1.根管扩大针保安器:应用根管扩大工具时,操作前要向病员详细解释操作过程,解除病员思想顾虑取得病员的充分合作。操作时,术者应思想集中,动作细巧,病员的头位不可过份后仰,以防止扩大工具滑脱而误咽入消化道或误落入呼吸道。上海某医疗单位在2万多次应用扩大针时有3例病员发生扩大针误 We now describe two practical tools for root canal therapy. 1. Root canal expansion needle guard: When using the root canal expansion tool, the operation should be explained in detail to the patient before operation to lift the patient's thoughts and concerns to obtain the full cooperation of the patient. Operation, the surgeon should be thought-intensive, delicate action, the patient's head position can not be too backward, in order to prevent the expansion of the tool slipping mistakenly swallowed into the digestive tract or fall into the respiratory tract. A medical unit in Shanghai in more than 20,000 times the application of needle expansion when there are 3 patients to expand the needle error occurs