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The effects of distraction osteogenesis on mandibular growth in growing minipigs: a report on three-dimensional morphologic changes.

Abstract：

BACKGROUND:The purpose of the study was to investigate the morphologic changes of distraction osteogenesis performed on the mandible in growing minipigs. METHODS:Eighteen piglets were divided into four groups. In group A (n = 6), animals received unilateral osteotomy and the distractor device was activated for 2 weeks after a 1-week latency period. In group B (n = 6), animals underwent the osteotomy procedure and distractor placement. In group C (n = 3), animals received the distractor, and in group D (n = 3), only four reference pins were placed. After completion of distraction, the head portions were sent for computed tomography scanning. The coordinates of each selected mandibular landmark were recorded on three-dimensional computed tomographic reconstruction images for further mathematical linear and angular measurements to quantify morphologic changes. RESULTS:The sagittal length related to gonial region was increased in group A but decreased in group B. Although all groups had the tendency of increased ramus width, it was only significant in group B. The distraction also reduced the gonial angle and elevated the ramus inclination to the Frankfort horizontal plane at the operated side. On the contrary, osteotomy alone opened the gonial angle and flattened the ramus inclination. CONCLUSIONS:Distraction could lengthen the mandibles in growing minipigs by reducing the gonial angle and displacing the mandible posteriorly. This effect, which allows for developing a prominent gonial angle, could be further explored in treating syndromic patients with the deficiency in the gonial region. A greater amount of overcorrection should be considered while treating growing patients because the mandibular osteotomy procedure itself seems to retard the growth.

journal_name

Plast Reconstr Surg

journal_title

Plastic and reconstructive surgery

authors

Chang HH,Tseng H,Hsieh TM,Huang CY,Chen YH,Hsu CY,Cheng WM,Chen MH,Chen SR,Yao CC

doi

10.1097/01.prs.0000163326.63031.30

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

2014-24

issue

eissn

0032-1052

issn

1529-4242

pii

00006534-200506000-00028

journal_volume

115

pub_type

杂志文章

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The effects of distraction osteogenesis on mandibular growth in growing minipigs: a report on three-dimensional morphologic changes.