Peri-implant tissue alteration around tissue-level and bone-level implants in fresh extraction sockets: a histomorphometric study in dogs

Chunan Zhang; Xu Zhao; Shichong Qiao; Xiaomeng Zhang; Hongchang Lai; Yingxin Gu

doi:10.21037/atm-20-8074

Peri-implant tissue alteration around tissue-level and bone-level implants in fresh extraction sockets: a histomorphometric study in dogs

Ann Transl Med. 2021 Feb;9(4):335. doi: 10.21037/atm-20-8074.

Authors

Chunan Zhang¹, Xu Zhao², Shichong Qiao¹, Xiaomeng Zhang¹, Hongchang Lai¹, Yingxin Gu¹

Affiliations

¹ Department of Implant Dentistry, Shanghai Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, Shanghai, China.
² Peking University Hospital of Stomatology first division, Beijing, China.

Abstract

Background: To compare tissue alteration in fresh extraction sockets between bone-level and tissue-level implants with different neck designs.

Methods: Bilateral premolars of 6 adult Labrador dogs were extracted, and 24 bone-level and tissue-level implants with two different neck designs were immediately placed. At the same time, buccal bony wall thickness in fresh extraction sockets was also recorded. The Straumann® Bone Level (BL) and Standard Plus (SP) implants were positioned at two insertion depths: 1mm below and flush with the alveolar crest. All animals were sacrificed 6 months after the implant placement. Undecalcified block sections were obtained for histological measurement. Vertical bone resorption and biological widths were documented. Statistical analysis consisted of two sample t-test and Wilcoxon sign-rank test.

Results: All implants were histologically osseointegrated. There was no significant difference between BL implants and SP implants in vertical bone resorption regardless of the insertion depths (P>0.05). Meanwhile, significant difference was found in lingual biological width between BL (3.16 mm) and SP (2.43 mm) implants when placed 1mm below the alveolar crest (P<0.05).

Conclusions: Within the limits, it seemed that different implant neck designs had little effect on bone remodeling in fresh extraction sockets. However, longer biological width was found in bone-level implants.

Keywords: Tissue alteration; bone-level implants; fresh extraction sockets; tissue-level implants.