| Summary: | Aim: This study aimed to investigate the impact of modified triangular flap (MTF) compared with the envelope flap (EF) on the incidence of dry socket and healing degree after lowerimpacted third molar surgery. Materials and methods: Present research was executed on 31 patients between the ages 17 and 24 years with the indication of removing impacted mandibular third molars in both sides with similar difficulty. The impacts of MTF and EF on degree of incidence of dry socket and healing on 3rd day and 1 week after surgery were recorded and investigated in a doubleblinded manner. The significant changes in mentioned indices in two groups were statistically judged using Chi-squared and Wilcoxon's statistical tests. Results: Three patients were excluded during the survey and 28 patients (56 samples) remained. The patients' average age was 20.1 years. Totally, 19 patients were female and 11 of them had academic education. Degree of dry socket incidence in MTF group was 11.76% and it was 41.17% in EF group (p = 0.042). In the follow-up session after 3 days since the surgery, healing degree mean in MTF group was 3.16 ± 1.5 and it was 4.37 ± 1.8 in EF group (p = 0.112). In follow-up session 7 days after the surgery, mean healing degree in MTF group was 0.037 ± 0.6 and it was 0.89 ± 0.73 in EF group (p = 0.005). Conclusion: Present study indicated that application of MTF may lead to a reduction in dry socket incidence and an increase of healing after 7 days since lower-impacted third molar surgeries. Clinical significance: Reducing postsurgery complication incidences following third molar surgery is an important issue, which could easily be achieved by designing appropriate flaps. © 2018 Jaypee Brothers Medical Publishers (P) Ltd.
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