# Comparison of Recurrence Rates of Odontogenic Keratocyst and Ameloblastoma following surgical excision and peripheral ostectomy in the Maxilla

## TL;DR

This study compares recurrence rates of two jaw lesions, odontogenic keratocyst and ameloblastoma, after conservative surgery in the maxilla.

## Contribution

The study provides new comparative data on recurrence rates of OKC and ameloblastoma following conservative surgical treatment in the maxilla.

## Key findings

- OKC had a 10.5% recurrence rate, while ameloblastoma showed no recurrences in the study group.
- Recurrences occurred even after long-term follow-up, suggesting the need for prolonged monitoring.
- OKC was predominantly located in the posterior maxilla, whereas ameloblastoma was evenly distributed.

## Abstract

Odontogenic keratocyst (OKC) and ameloblastoma are benign but locally aggressive jaw lesions that require careful surgical management. While radical resection has traditionally been the preferred treatment, conservative approaches such as surgical excision with peripheral ostectomy have gained interest to prevent significant functional and aesthetic consequences. This study aims to compare the recurrence rates of OKC and ameloblastoma in the maxilla following conservative surgical treatment.

A retrospective analysis was performed on 31 patients who underwent surgical excision with peripheral ostectomy for OKC (n = 19) or ameloblastoma (n = 12) in the maxilla between 2006 and 2024. Recurrence was monitored through periodic radiographic follow-ups (mean duration: 43 months), including panoramic radiograph and cone-beam computed tomography (CBCT).

Among the 19 OKC cases, tumor recurred in two patients (10.5%) at 5, and 14 years post-surgery, while no recurrences were found in the ameloblastoma group. The majority of OKC (95%) were located in the posterior maxilla, whereas ameloblastoma showed an even distribution between the anterior and posterior regions, with 50% in each. Although Fisher’s Exact Test did not demonstrate a statistically significant difference in recurrence rates, simple comparison suggests that OKC may have a higher tendency for recurrence than ameloblastoma following conservative treatment.

Surgical excision with peripheral ostectomy appears to be a viable conservative treatment option for both OKC and ameloblastoma in the maxilla, with a relatively low recurrence rate observed in this study. Notably, recurrences observed even after long-term follow-up indicate the necessity for prolonged monitoring.