Vertical alveolar bone distraction at molar region using lag screw principle

Vertical alveolar bone distraction at molar region using lag screw principle
July 2004
Soon-Jung Hwang, MD, DDS *
Jong-Geul Jung, DDS ÇƒÜ
Ji-Ung Jung, DDS Çƒ?
Seung-Hyun Kyung, DDS, PhD ¨? *
Journal of Oral and Maxillofacial Surgery Online
Abstract
Purpose Recently, alveolar bone distraction has been widely used and several devices have been developed for this purpose. However, there are some disadvantages in each device, especially for distraction of posterior alveolar ridge. The purpose of this study was to develop a new device for vertical alveolar bone distraction at the molar region and to show the results of its clinical application.
Materials and methods The mechanism of device is based on lag screw principle and the device consists of the following 4 components; distraction screw, hole implant fixture, supporting plate, and temporary short implant and/or neighboring natural teeth. The distraction screw suspended at the supporting plate is inserted into the internal thread of the hole implant fixture placed at alveolar transport segment. If the distraction screw turns at the supporting plate, the hole implant fixture with transport segment moves to the supporting plate without vertical movement of the screw at the supporting plate like a lag screw. After an animal experiment using 4 beagle dogs, the device was clinically applied in 4 patients before implant insertion.
Results The distraction of the alveolar bone could be successfully performed in all patients without any complications. The direction of distraction with this device could be adjustable, and the alveolar bone could be distracted not only vertically but also horizontally. Moreover, the surgical technique is simple with no need for a second surgery, and there is no occlusal disturbance from the device.
Conclusions The new device for alveolar bone distraction using lag screw principle can be used effectively in the molar region.
Publishing and Reprint Information
*Assistant Professor, Department of Oral and Maxillofacial Surgery, College of Dentistry, Seoul National University, Seoul, South Korea
ÇƒÜResident, The Institute of Oral Health Science, School of Medicine, Sungkyunkwan University, Samsung Medical Center, Seoul, South Korea
Çƒ?Resident, The Institute of Oral Health Science, School of Medicine, Sungkyunkwan University, Samsung Medical Center, Seoul, South Korea
¨?Assistant Professor, The Institute of Oral Health Science, School of Medicine, Sungkyunkwan University, Samsung Medical Center, Seoul, South Korea
This study was supported by grant 03-PJ1-PG3-20500-0099 from the Korea Health 21 R&D Project, Ministry of Health & Welfare, Republic of Korea.
*Address correspondence and reprint requests to Dr Kyung: The Institute of Oral Health Science, School of Medicine, Sungkyunkwan University, Samsung Medical Center, 50, Irwon-Dong, Kangnam-Ku, Seoul 135-710, South Korea; Email: sjhwang@snu.ac.kr
Email address: sjhwang@snu.ac.kr
Copyright ¨© 2004 by American Association of Oral and Maxillofacial Surgeons
doi: 10.1016/j.joms.2004.01.011
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