ENGLISH ABSTRACT
JOURNAL ARTICLE
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[Applicational evaluation of split tooth extractions of upper molars using piezosurgery].

OBJECTIVE: To evaluate the efficacy of Piezosurgery in split teeth extractions.

METHODS: A single-center, randomized, split-mouth study was performed using a consecutive serious of unrelated healthy patients attending the departing of oral and maxillofacial surgery, Peking University School and Hospital of Stomatology. 40 patients were selected for extraction of maxillary molars without reservation value,splitting or nonvital teeth. They were divided into control (20 patients) and test groups (20 patients) randomly. Surgical treatments for both groups were under local anesthesia. Molar teeth of control group were extracted by common equipments like dental elevators, chisels, forceps, etc. While molar teeth of experimental group were extracted by Piezosurgery, aided with the use of common equipments if needed. Then we compared the duration of surgery, frequency of the usage of chisels, expansion of postoperative bony socket surgical discomfort and postoperative pain between two groups.

RESULTS: The average of operation time was (629.5±171.0) s in control group and (456.0±337.2) s in test group. The buccal alveolar bone reduced (1.07±0.64) mm in control group and (1.49±0.61) mm in test group. There was a significant difference between the two groups (P<0.05). The duration of surgery for experimental group was significantly longer than that of the control group, but the change of buccal alveolar bone was lower than the control group. For visual analogue scale (VAS) value of surgical discomfort, expansion of postoperative bony socket and the operative fear rate, there were no significant difference between the two groups (P>0.05).

CONCLUSION: Piezosugery can be better to preserve alveolar bone, reduce trauma and patient's fear. Application of the piezosugery reflect the characteristics of minimally invasive extraction, which has the value of promotion. The Piezosurgery technique have the advantage of reducing change of buccal alveolar bone during the surgery, but a longer surgical time was required when compared with the conventional technique. VAS value of surgical discomfort, expansion of postoperative bony socket and the operative fear rate, there were no significant difference. Minimally invasive tooth extraction technique has good clinical results and high satisfaction. Piezosurgery proved its worth as the instrument adapted to limiting the destruction of bone tissue.

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