Osteotome sinus floor elevation with and without grafting: an animal study in Labrador dogs

Authors

  • Mi-Si Si,

    1. Department of Oral and Maxilliofacial Implantology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Institute of Stomatology, Shanghai Jiaotong University, Shanghai, China
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  • Jia-Ji Mo,

    1. Department of Oral and Maxilliofacial Implantology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Institute of Stomatology, Shanghai Jiaotong University, Shanghai, China
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  • Long-Fei Zhuang,

    1. Faculty of Dentistry, the University of Hong Kong, Sai Ying Pun, Hong Kong
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  • Ying-Xin Gu,

    1. Department of Oral and Maxilliofacial Implantology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Institute of Stomatology, Shanghai Jiaotong University, Shanghai, China
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  • Shi-Chong Qiao,

    1. Department of Oral and Maxilliofacial Implantology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Institute of Stomatology, Shanghai Jiaotong University, Shanghai, China
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  • Hong-Chang Lai

    Corresponding author
    1. Department of Oral and Maxilliofacial Implantology, Shanghai Ninth People's Hospital, School of Medicine, Shanghai Institute of Stomatology, Shanghai Jiaotong University, Shanghai, China
    • Corresponding author:

      Hong-Chang Lai

      Department of Oral and Maxillo-facial Implantology

      Shanghai Ninth People's Hospital

      School of medicine

      Shanghai Institute of Stomatology

      Shanghai Jiaotong University

      639 Zhizaoju Road

      Shanghai 200011

      China

      Tel.: +86 21 23271699 ext: 5298

      Fax: +86 21 53073068

      e-mail: lhc9@hotmail.com

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Abstract

Aim

To evaluate implant stability and histological outcomes after osteotome sinus floor elevation (OSFE) procedure, and to compare new bone formation and implant osseointegration with and without grafting.

Material and methods

OSFE with simultaneous implant placement was conducted bilaterally on 6 Labrador dogs. Twenty-four implants were placed. The right side sinus (Group 1) was grafted with biphasic calcium phosphate (BCP), whereas the left side (Group 2) was left without any grafting materials. The animals were euthanized 8 and 24 weeks after surgery for histological and histomorphometric assessment. Bone-to-implant contact (BIC%), alveolar bone height (ABH), bone density (BD) and grafting material density (GMD) were measured. The implant stability (ISQ) was assessed using resonance frequency analysis (RFA) at implant placement and 1, 2, 4, 8, 12, 24 weeks after surgery.

Results

Endo-sinus new bone with direct contact to implant surface were observed in two groups at both time points. ABH showed no difference between groups at both time points. BIC% and BD in Group 2 (40.05%, 35.90%) was higher than those in Group 1 (23.30%,25.59%) at 24 weeks. Significant shrinkage of grafting material was seen in Group 1. The GMD in Group 1 at 8 weeks was 24.35%, while it dropped to 19.90% at 24 weeks. The changing pattern of ISQ for both groups were similar.

Conclusions

Spontaneous new bone formation and better bone-to-implant contact were found for OSFE without grafting. The grafting material application during OSFE procedure showed no advantages in histological results.

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