الفهرس 
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Abstract
This study was carried out to evaluate the effectiveness of Hemecon Dental Dressing (HDD) on healing after surgical extraction of the impacted mandibular third molars.
This study was conducted on 25 adult patients with an age range of 20 to 30 years having mesio-angular impacted mandibular third molars indicated for surgical extraction. They were selected from the Out-Patient Clinic of Oral and Maxillofacial Surgery Department, Faculty of Dentistry, Alexandria University.
The patients were divided into two groups:
• Control group: Composed of 15 patients whose empty sockets were left to heal without any interference.
• Study group: Composed of 10 patients whose empty sockets were packed with HDD.
Postoperative antibiotic and analgesics were prescribed. All patients were instructed to apply ice bags extra orally for 20 minutes/hour, five times on the day of operation only. Proper oral hygiene was maintained by using a warm antiseptic mouth wash starting on the second post-operative day and lasting for a week. The sutures were removed after 7 days.
The post-operative evaluation was performed both clinically and radiographically
Clinical evaluation
The study was performed to evaluate:
• Pain and edema using the visual analogue scale on the second, fourth and seventh postoperative days.
• Trismus using a caliber applied between the upper central incisors and the lower central incisors at the midline preoperatively and on the second, fourth and seventh postoperative days.
• Pocket depth using a periodontal probe preoperatively and on the first and third months postoperatively.
Radiographic evaluation
It was performed to evaluate the bone density at the site of the extraction using image processing program (Image J program). It was recorded at the base line, on the first and third month postoperatively.
This study showed significantly more pain in the study group than in the control group on the second post-operative day. More pain was also reported in the study group on the fourth and seventh days post operatively but the difference was not significant.
There was significantly more swelling in the study group than in the control group on the second and fourth post-operative days. Post-operative trismus was also more pronounced in the study group than in the control group although the difference was not significant. Delayed wound healing was reported in six cases from the study group.
There was significant increase in the bone density in study group than in the control group on the first and the third months postoperatively.