Comparison of wall removal type versus wall retaining type of decompression for treating large mandibular odontogenic cysts

Abstract

Objective: To evaluate the differences between two types of decompression for treating large mandibular odontogenic cysts.

Materials and methods: This retrospective, cohort study included patients who were diagnosed for large mandibular odontogenic cysts from January 2015 to April 2018 and underwent two different types of decompression based on removal or retention of the cyst wall. The primary outcome was the percentage of the residual cyst area within 1 year after surgery. We used the propensity score matching (PSM) to balance the covariates of the two groups, and the primary outcome was analyzed by the non-inferiority test.

Results: A total of 93 cases were included in our study. After 1 year, the wall removal group was non-inferior to the wall retaining group in terms of cyst area, cyst volume, and the difference between the HU values of the original cyst region and the normal mandible. In subgroup analysis, we found there were no differences between two groups in the percentage of patients in whom the cystic area was reduced by 90% after 1 year.

Conclusion: Our findings suggest that the wall removal group showed better results than the cyst wall retaining group in large mandibular odontogenic cysts.

Keywords: cohort study; decompression; large odotogenic cyst.