| Objective:In order to measure the volume of the preoperative fissure zone and the postoperative bone graft area in different period accurately,the patients of unilateral complete alveolar cleft were scanned with Cone-beam CT(cone beam computed tomography,CBCT)in different period of preoperation and postoperation.It can accurately understand the status of bone volume changes in the region of bone graft,and provide reference for clinician to do preoperative evaluation of bone graft and assessment in different period after the bone graft surgery.Methods:26 cases of unilateral complete alveolar cleft hospitalized patients were chosen from Affiliated Stomatological Hospital of Nanchang University,routine iliac cancellous bone graft.According to whether the canine eruption,they were divided into two groups(group Aand group B).The patients whose canines in cleft side have not been eruption were classified in group A,of which is a group of 14 cases.The patients whose canines in cleft side have been eruption were classified in group B,of which is a group of 12 cases.All the members in group A and B were scanned with CBCT in 1 week before bone graft surgery and 1 week,1 month,3 months and 6 months after the surgery in department of Radiology in our hospital.We got the raw data into the software of Kavo Exam Vision and Image J,so as to obtain the volume of preoperative alveolar cleft and postoperative remaining bone.Result:The amount of Alveolar bone resorption in postoperative one month in group A and B was 0.47±0.11cm3、0.25±0.09cm3,respectively;in postoperative 3 months,the amount was 0.57±0.14cm3、0.45±0.18cm3;in postoperative 6 months,the amount was 0.84±0.17cm3、0.63±0.20cm3.The bone resorption rates in postoperative one month in group A and group B were 29±4%、16±3%,respectively;in postoperative 3 months,the rates were 36±5%、28±4%;in postoperative 6 months,the rates were 52±2%、42±3%.The comparison in group A and B: In group A,there was statistically significant difference in average volume of fissure zone in postoperative one week and one month(P<0.05).There was no statistically significant difference in average volume of fissure zone in postoperative one month and three months(P>0.05).There was no statistically significant difference in average volume of fissure zone in postoperative three months and six months(P>0.05).In group B,there was statistically significant difference in average volume of fissure zone in postoperative one week and one month(P<0.05).There was no statistically significant difference in average volume of fissure zone in postoperative one month and three months(P>0.05).There was no statistically significant difference in average volume of fissure zone in postoperative three months and six months(P>0.05).The comparison between group A and B: There was no statistically significant difference in fracture zone between group Aand group B in preoperative one week(P>0.05);the bone volume after one week between group A and group B has no statistically significant difference(P>0.05).there was statistically significant difference in bone resorption volume in postoperative one month between group A and group B(P>0.05).So as the bone resorption volume in postoperative three months and six months(P<0.05).Conclusion:1.Through CBCT and Image J software to calculate the defect volume of the alveolar cleft and the residual bone volume after the surgery,it is a scientific and feasible method.2.Whether patients’ canine have been erupted or not when doing alveolar cleft bone grafting surgery,a large amount of bone resorption will happen in postoperatice one month,and the resorption will be slowly after two to six months,and does not reach a steady state.Therefore,in postoperative one month to three months,the orthodontic treatment could be considered,and do the repair treatment after postoperative three months.3.The bone resorption rates of patients whose canine did not erupt are less than patients whose canine already erupted.Therefore,it is important to consider the dental age of the patient before the bone grafting.4.Through the calculationof the volume of the preoperative fissure zone and the postoperative bone graft area,it could provide reference for the surgical approach,over filling of bone graft and postoperative evalution of the bone absorption in each period for clinicians. |
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