Evaluation of healing at molar extraction sites with and without ridge preservation: a three-arm histologic analysis

Mylinh Duong, Brian L Mealey, Christopher Walker, Shaimaa Al-Harthi, Thomas J Prihoda, Guy Huynh-Ba
Journal of Periodontology 2019 July 29

BACKGROUND: Little evidence is available regarding the benefit of ridge preservation (RP) at molar sites. The primary objective of this three-arm cohort study was to histologically compare the healing outcome between natural healing after molar tooth extraction and two different techniques of RP using freeze-dried bone allograft (FDBA) and a non-resorbable dense polytetrafluoroethylene membrane (dPTFE), or an absorbable collagen sponge as a barrier.

METHODS: Seventy-nine patients requiring extraction and delayed implant placement were placed into three groups: extraction alone (Control); ridge preserved using: FDBA and either dPTFE (Test1) or collagen sponge (Test2). Bone cores were harvested from implant osteotomies at approximately 3 months after extraction for histomorphometric analysis to determine the percentage of vital bone, residual graft, and connective/other tissue. Ridge dimension changes were also evaluated radiographically (cone-beam computed tomography).

RESULTS: The percentage of vital bone was significantly greater in Control group compared to Test1 but was not statistically different between other groups. Test2 showed significantly less connective/other tissue than Control and Test1. The percentage of residual graft was significantly lower in Test1 compared to Test2. There was no significant correlation between the percentage of vital bone or residual graft and the following parameters: healing time, patient age, gender, buccal plate thickness or radiographic changes in ridge dimensions.

CONCLUSION: RP at molar sites using FDBA and an absorbable collagen sponge may be a sufficient and economical way to preserve the ridge dimension without interfering with the amount of new bone formation. This article is protected by copyright. All rights reserved.

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