الفهرس 
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Abstract
The objective of this study was to compare between fracture healing using miniplates with and without PRF membrane in bilateral mandibular fractures both clinically and radiographically.
A total of twelve patients were selected from those admitted to the Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Alexandria University suffering from bilateral mandibular fractures. Their ages ranged between 20 and 50 years with mean age of 23 years. Each participant had bilateral mandibular fractures, one side as a study group and the other side as a control group. Each patient was treated as followed:
Study Group: The mandibular fracture on the right side was treated by open reduction and direct fixation using the conventional 2.0mm miniplates and screws with placement of PRF membrane.
Control Group: The mandibular fracture on the left side was treated by open reduction and direct fixation using the conventional 2.0mm miniplates and screws.
Patients were then followed up for 6 months postoperatively and the collected clinical and radiographic data was statistically analyzed.
Clinical results
None of the patients in either of the groups had infection, nonunion, within the follow up period.
There was no statistically significant difference in the mean value of pain score between the fractures were treated with conventional miniplates with placement of PRF membrane and those fixed with miniplates only for both groups. There was only a significant difference in the maximal mouth opening on 2nd day, 3 and 6 months postoperatively when compared to the baseline. In both groups, edema was limited to the area of operation and resolved completely in all cases by the end of 4th week postoperatively. The examination of occlusion revealed normal occlusion and normal intercuspal relation; there was no need for selective grinding in any case. There was sensory impairment of the lower lip sensation in 3 cases preoperative due to injury. One of the cases didn’t regain normal sensation by the end of 6 months postoperative follow up.
Radiographic findings
On immediate, 3 and 6 months postoperatively the mean bone density in the study group was higher than the control. This finding proved to be statistically significant throughout the follow up period but the percentage change in the bone density from immediate postoperative to 3 months, immediate postoperative to 6 months and from 3 to 6 months was not statistically significant comparing the two groups which means the mean bone density is significantly higher but the pattern of improvement comparing the two groups is nearly the same along time.