Abstract
Objective
To assess the contour and volumetric changes of hard and soft tissues after guided bone regeneration (GBR) using two types of barrier membranes together with a xenogeneic bone substitute in dehiscence-type defects around dental implants.
Material and methods
In 8 Beagle dogs, after tooth extraction, two-wall chronified bone defects were developed. Then, implants were placed with a buccal dehiscence defect that was treated with GBR using randomly: (i) deproteinized bovine bone mineral (DBBM) covered by a synthetic polylactic membrane (test group), (ii) DBBM plus a porcine natural collagen membrane (positive control) and (iii) defect only covered by the synthetic membrane (negative control group). Outcomes were evaluated at 4 and 12 weeks. Micro-CT was used to evaluate the hard tissue volumetric changes and STL files from digitized cast models were used to measure the soft tissues contour linear changes.
Results
Test and positive control groups were superior in terms of volume gain and contour changes when compared with the negative control. Soft tissue changes showed at 4 weeks statistically significant superiority for test and positive control groups compared with negative control. After 12 weeks, the results were superior for test and positive control groups but not statistically significant, although, with a lesser magnitude, the negative control group exhibited gains in both, soft and hard tissues.
Conclusions
Both types of membranes (collagen and synthetic) attained similar outcomes, in terms of hard tissue volume gain and soft tissue contours when used in combination with DBBM
Clinical relevance
Synthetic membranes were a valid alternative to the “gold standard” natural collagen membrane for treating dehiscence-type defects around dental implants when used with a xenogeneic bone substitute scaffold
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Acknowledgements
We wish to acknowledge the support from Prof. Fernando Muñoz at the University of Santiago – Lugo Veterinary Hospital where the prophylometric measurements were carried out under his close supervision. We also acknowledge the support of the Biomaterials Group from Universitat Politècnica de Catalunya where the specimens were processed for micro-CT analysis.
Funding
This study was partially funded through a research contract between the Sunstar Group (Switzerland) and the University Complutense of Madrid.
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Supplementary Fig. 1
Picture of a section of Micro-Ct where an increase in the buccal contour was observed at level of implant shoulder (H=0) (yellow line), although the first mineralized tissue to implant contact was in a more apical position (purple arrow). (PNG 5640 kb)
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Di Raimondo, R., Sanz-Esporrín, J., Sanz-Martin, I. et al. Hard and soft tissue changes after guided bone regeneration using two different barrier membranes: an experimental in vivo investigation. Clin Oral Invest 25, 2213–2227 (2021). https://doi.org/10.1007/s00784-020-03537-5
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DOI: https://doi.org/10.1007/s00784-020-03537-5
Keywords
- Guided bone regeneration
- Synthetic barrier membrane
- Collagen membrane
- Prophilometric and volumetric changes
- Dental implant
- Animal model