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Enviado por:  lugufa  09 noviembre 2013
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ORIGINAL ARTICLE

The effect of anterior tooth retraction on lip position of orthodontically treated adult Indonesians

Joko Kusnoto, DDS, MS,a and Hendro Kusnoto, DDS, PhDb

Jakarta, Indonesia

This study was conducted to determine upper and lower lip changes after orthodontic treatment of bimaxillary dental protrusion in adult Indonesians. Pretreatment and posttreatment cephalograms of 40 patients (6 males and 34 females) who required extraction of 4 premolars, were traced, superimposed, and measured. The changes of anterior tooth position (measured as the horizontal distance from the incisal tip to a constructed vertical through sella) were correlated with changes in the upper and lower lip positions with the Pearson correlation method. Significant positive correlation was found between changes of the maxillary and mandibular incisors with the changes in both the upper lip (rU1 = 0.39, P < .05; rL1 = 0.44, P < .01) and the lower lip (rU1 =

0.44, P < .01; rL1 = 0.51, P < .01) positions. By using stepwise multiple regression, it was found that for every

millimeter of mandibular incisor retraction, 0.4 mm of upper lip retraction and 0.6 mm of lower lip retraction were

produced. This study concluded that, for this Indonesian sample, a strong correlation exists between mandibular anterior tooth retraction and the position of both lips. (Am J Orthod Dentofacial Orthop 2001;120:304-7)

oft tissue profile changes as a result of orthodon- tic reduction of bimaxillary protrusion are expected when the main treatment objective is to decrease convexity of the lower face and fullness of the lips. To achieve that objective, retraction of the maxil- lary and mandibular anterior teeth becomes a very important factor, and extractions are often planned to

create room for retraction of the anterior teeth.

This study examines the effect of maxillary and mandibular anterior teeth retraction on reduction of soft tissue bimaxillary protrusion i

n the Indonesian population. This information is of interest because Indonesia’s population is the fourth largest in the world and shares many common facial characteristics with Southeast Asian populations. Most Indonesians have similar facial features except for those from the eastern region who have Aboriginal traits. Bimaxillary protru- sion is a common facial characteristic, but the effect of orthodontic treatment on bimaxillary protrusion for Southeast Asian populations has only limited docu- mentation. It is also necessary to have this informa- tion to form a baseline for creating computer simula- tions of treatment results for Southeast Asian patients.

Hard tissue changes involving the lower third of the face affect the soft tissue drape, namely the lips, the

From the College of Dentistry, Trisakti University, Jakarta, Indonesia.

aFormer student.

bProfessor, Department of Orthodontics.

Reprint requests to: Joko Kusnoto, Musi 27, Jakarta 10150, Indonesia. Submitted, July 2 ...



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