الفهرس 
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Abstract
The objective of this study was to evaluate the treatment of oroantral fistulous defects by the use of GBR (guided bone regeneration), through the placement of SonicWeld® Resorb X® foil membranes, compared to the traditional sole use of buccal advancement flaps.
The study included 14 patients selected on random basis from those admitted to the Oral and Maxillofacial Surgery department in Alexandria University, Faculty of Dentistry.The patients selected had oroantral fistulas of more than three weeks duration with defective bone of at least five millimeters width. The patients were divided into two groups; group I were treated with SonicWeld® Resorb X® foil membrane along with buccal advancement flap, and group II were treated with buccal advancement flap only.
Patients’ evaluation
All cases were evaluated as follows:
History, including present history of any recent extraction and/or cause of the oroantral communication, and past medical history.
Clinical examination included both extraoral and intraoral examinations.
Radiographic examination using cone-beam computerized tomography (CBCT).
Surgical procedures
Decoring of the fistulous tract
Reflection of buccal mucoperiosteal trapezoidal flap
Preparation of Caldwell-Luc access to the maxillary sinus and curettage of affected membrane and/or removal of granulation tissue, polypoids, and remaining roots
In study group (group I), placement of SonicWeld® ResorbX® pins buccal to defect and adaptation of the foil membrane and welding with the pins
In control group (group II), no membrane was placed
Horizontal releasing incisions of the buccal flap and advancement and suturing of the flap
Clinical and radiographic follow up
Clinical evaluation was done for each patient at 1 week, 2 weeks, 1 month, and 3 months postoperatively.The patients were examined for pain sensation, presence of infection, edema or bleeding, and the degree of healing of the mucoperiosteal flap.
Radiographic evaluation was done at 3 months by CBCT to examine for any bone formation.
Clinical and radiographic results
Evaluation of the patients revealed that proper healing of the wound occurred in most of the patients, except two in the study group.However, healing occurred in shorter time in the control group.Pain intensity decreased throughout the follow-up period in both groups, but was more significant decrease in the control group.Infection was observed more in the control group.
Radiographically, very little bone formation occurred in the fistulous defect in both groups.