Abstract: Objective To compare the clinical effect of minimal invasive and general tooth extraction in pulling out residual roots, residual crowns and fractured tooth. Methods Six hundred and thirty patients who have to extract tooth were randomly divided into minimal invasive group (315 persons) and traditional technique group (315 persons). The time of operation, dental fear rate, alveolus intact rate, incidence rate of root broken, gingival lacerated rate, and postoperative effects were compared and analyzed. Results The operation time in minimal invasive group was shorter than that in traditional technique group (p<0.05), the intraoperative and postoperative complications incidence rate of the minimal invasive group were markedly lower than the traditional technique group (p<0.05). Conclusion Minimal invasive tooth extraction applied in extraction of residual roots, residual crowns and fractured tooth can efficiently reduce complications of intraoperative and postoperation, and make the operation more comfortable. Therefore, minimally invasive tooth extraction is recommendable.

Key words: Minimal invasive technique, Complex tooth, Tooth extraction, Complication