# The effect of a barrier membrane on the incorporation of deproteinized bovine bone mineral (DBBM) in experimental defects at the time of early implant placement. A preclinical study

## TL;DR

This preclinical study examines how a membrane affects bone regeneration when used with a bone substitute during implant placement in dogs.

## Contribution

The study provides insights into membrane effects on bone substitute retention and new bone formation in guided bone regeneration.

## Key findings

- Membrane use tended to retain more bone substitute but did not significantly affect new bone ingrowth.
- Lateral sections showed significantly more bone ingrowth and mineralized tissue compared to central sections.
- Histological outcomes were largely similar between membrane-covered and non-covered sites.

## Abstract

This study aimed to assess membrane use with a bone substitute graft for guided bone regeneration (GBR) in experimental dehiscence defects.

Maxillary second incisors (I2) in 9 dogs were extracted. Six weeks later, implants were inserted and experimental dehiscence defects (5 × 3 mm) created on the buccal aspect. The defects and surrounding bone were grafted with deproteinized bovine bone mineral. One side (test) was covered with a resorbable collagen membrane whereas the contralateral side (control) was not. After 6 weeks, histomorphometrical analysis was performed to evaluate: (a) first bone-to-implant contact (fBIC), (b) buccal bone thickness at 1 mm increments from implant shoulder, (c) regenerated area (RA), (d) area and percentages of new bone (B), bone substitute (BS) and mineralized tissue (MT).

The histological appearance was similar between test and control sites. At central and lateral sections, there were no differences between groups for fBIC, buccal bone thickness, RA, BS, B, %B, MT and %MT. At central sections, membrane use favoured more %BS and %MT (p = 0.052). There was significantly more B, %B and MT at lateral compared to central sections.

Membrane use tended to retain more bone substitute, but had no effect on new bone ingrowth. Lateral sections showed significantly more bone ingrowth and mineralized tissue compared to central sections, confirming that new bone ingrowth takes place mainly from the lateral walls of the defect.

Preclinical research to clarify the dynamics of bone regeneration in GBR procedures is relevant in clinical practice.