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International Journal of Dentistry
Volume 2012, Article ID 471320, 11 pages
http://dx.doi.org/10.1155/2012/471320
Clinical Study

Simultaneous Sinus Lifting and Alveolar Distraction of a Severely Atrophic Posterior Maxilla for Oral Rehabilitation with Dental Implants

1Division of Oral and Maxillofacial Surgery, Kagawa Prefectural Central Hospital, 7608557 Kagawa, Japan
2Department of Oral and Maxillofacial Surgery, Shimane University Faculty of Medicine, 6938501 Izumo, Japan
3OMS Takamatsu, 7600047 Kagawa, Japan
4Department of Oral and Maxillofacial Surgery, Samsung Medical Center, 130710 Seoul, Republic of Korea
5Ohwada Dental Clinic, 1430014 Tokyo, Japan
6MM Dental Clinic, Center of Implant Dentistry, 2200012 Yokohama, Japan

Received 9 February 2012; Revised 4 April 2012; Accepted 19 April 2012

Academic Editor: Ozgur Pektas

Copyright © 2012 Takahiro Kanno et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We retrospectively reviewed a new preimplantation regenerative augmentation technique for a severely atrophic posterior maxilla using sinus lifting with simultaneous alveolar distraction, together with long-term oral rehabilitation with implants. We also analyzed the regenerated bone histomorphologically. This study included 25 maxillary sinus sites in 17 patients. The technique consisted of alveolar osteotomy combined with simultaneous sinus lifting. After sufficient sinus lifting, a track-type vertical alveolar distractor was placed. Following a latent period, patient self-distraction was started. After the required augmentation was achieved, the distractor was left in place to allow consolidation. The distractor was then removed, and osseointegrated implants (average of 3.2 implants per sinus site, 80 implants) were placed. Bone for histomorphometric analysis was sampled from six patients and compared with samples collected after sinus lifting alone as controls ( ). A sufficient alveolus was regenerated, and all patients achieved stable oral rehabilitation. The implant survival rate was 96.3% (77/80) after an average postloading followup of 47.5 months. Good bone regeneration was observed in a morphological study, with no significant difference in the rate of bone formation compared with control samples. This new regenerative technique could be a useful option for a severely atrophic maxilla requiring implant rehabilitation.