Dimensional ridge changes in conjunction with four implant timing protocols and two types of soft tissue grafts: A pilot pre-clinical study

Kwang Seok Lee, Seung Yun Shin, Christoph H.F. Hämmerle, Ui Won Jung, Hyun Chang Lim, Daniel S. Thoma

Research output: Contribution to journalArticlepeer-review


Aim: To determine the effect of (1) implant placement timing and (2) the type of soft tissue graft in terms of ridge profile changes. Materials and Methods: Four implant treatment modalities were applied in the mesial root areas of the third and fourth mandibular premolars of 10 mongrel dogs alongside connective-tissue graft (CTG) and volume-stable cross-linked collagen matrix (VCMX): immediate, early, and delayed placement (DP), and DP following alveolar ridge preservation (ARP). All dogs were sacrificed 3 months after soft tissue augmentation. Standard Tessellation Language files from designated time points were analysed. Results: Compared with the pre-extraction situation, the median width of the ridge demontstrated a linear increase only in group ARP/CTG (0.07 mm at the 2-mm level), whereas all other groups showed a reduction (between −1.87 and −0.09 mm, p >.05). Groups ARP/CTG (0.17 mm) and DP/CTG (0.05 mm) exhibited a profilometric tissue gain in a set region of interest (p >.05). The net effect of CTG and VCMX ranged from 0.14 to 0.79 mm. Conclusions: Dimensional ridge changes varied between treatment protocols. ARP with CTG led to the smallest difference in ridge profile between the pre-extraction and the study end time point. Both CTG and VCMX enhanced the ridge contour.

Original languageEnglish
Pages (from-to)401-411
Number of pages11
JournalJournal of Clinical Periodontology
Issue number4
Publication statusPublished - 2022 Apr

Bibliographical note

Funding Information:
The project (18‐040) was supported by a grant from the Osteology Foundation, Switzerland. Funding information

Funding Information:
We thank Prof. J?rg H?sler, University of Zurich, for his support and expertise in performing statistical analysis and Ms. Kyeong-Won Paeng, Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Republic of Korea, for supporting the animal experiments. Dental implants were kindly provided by Shinhung, Seoul, Republic of Korea. Bone substitute materials, collagen membranes, and collagen matrices were kindly supplied by Geistlich, Wolhusen, Switzerland.

Publisher Copyright:
© 2022 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd

All Science Journal Classification (ASJC) codes

  • Periodontics


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