Early Implant Placement in Sites with Ridge Preservation or Spontaneous Healing: Histologic, Profilometric, and CBCT Analyses of an Exploratory RCT

Overview

Journal J Periodontal Implant Sci

Specialty Dentistry

Date 2023 Jul 31

PMID 37524379

Authors

Stefan P Bienz

Edwin Ruales-Carrera

Wan-Zhen Lee

Christoph H F Hammerle

Ronald E Jung

Daniel S Thoma

Affiliations

Soon will be listed here.

Abstract

Purpose: The aim of this study was to compare changes in soft and hard tissue and the histologic composition following early implant placement in sites with alveolar ridge preservation or spontaneous healing (SH), as well as implant performance up to 1 year after crown insertion.

Methods: Thirty-five patients with either intact buccal bone plates or dehiscence of up to 50% following single-tooth extraction of incisors, canines, or premolars were included in the study. They were randomly assigned to undergo one of three procedures: deproteinized bovine bone mineral with 10% collagen (DBBM-C) covered by a collagen matrix (DBBM-C/CM), DBBM-C alone, or SH. At 8 weeks, implant placement was carried out, and cone-beam computed tomography scans and impressions were obtained for profilometric analysis. Patients were followed up after the final crown insertion and again at 1 year post-procedure.

Results: Within the first 8 weeks following tooth extraction, the median height of the buccal soft tissue contour changed by -2.11 mm for the DBBM-C/CM group, -1.62 mm for the DBBM-C group, and -1.93 mm for the SH group. The corresponding height of the buccal mineralized tissue changed by -0.27 mm for the DBBM-C/CM group, -2.73 mm for the DBBM-C group, and -1.48 mm for the SH group. The median contour changes between crown insertion and 1 year were -0.19 mm in the DBBM-C/CM group, -0.09 mm in the DBBM-C group, and -0.29 mm in the SH group.

Conclusions: Major vertical and horizontal ridge contour changes occurred, irrespective of the treatment modality, up to 8 weeks following tooth extraction. The DBBM-C/CM preserved more mineralized tissue throughout this period, despite a substantial reduction in the overall contour. All 3 protocols led to stable tissues for up to 1 year.

Citing Articles

Does defect configuration affect the outcomes of alveolar ridge preservation? An experimental study.

Lee D, Choi J, Ko Y, Koo K, Seol Y, Lee Y J Periodontal Implant Sci. 2024; 55(1):35-49.

PMID: 39439106 PMC: 11885871. DOI: 10.5051/jpis.2401480074.

Clinical evaluation of implants placed within or beyond the boundaries of the alveolar ridge preservation: a retrospective case series with 10 weeks of observations in 28 patients.

Ko Y, Koo K, Li L, Lee D, Lee Y, Seol Y J Periodontal Implant Sci. 2024; 55(1):50-61.

PMID: 39058351 PMC: 11885866. DOI: 10.5051/jpis.2400800040.

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