Gayathri, M (2017) Evaluation of Upper Lip Pressure Variations in relation To Retraction of Maxillary Anterior Teeth: An In Vivo study. Masters thesis, Tamil Nadu Government Dental College and Hospital, Chennai.
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Abstract
BACKGROUND : The influence of the forces exerted by the perioral musculature on the position of teeth has been the object of many scientific studies. Of the forces from soft tissues, those from the tissues in passive resting state are believed to be more important than forces exerted on teeth during various functions such as speech and swallowing. AIMS AND OBJECTIVES : This study was aimed to quantify the variations occurring in the pressure exerted by upper lip when the upper anterior teeth are retracted towards their average norms of inclination and to find out the ratio between the changes in lip pressure for every millimeter of retraction of maxillary incisors.. METHOD : Lip pressure at rest was recorded in 30 subjects having class I and class II division 1 malocclusion (15 individuals each),using a force resisting sensor, at monthly intervals for five months (T0-T5) during retraction of maxillary anterior teeth towards their planned position and an acceptable nasolabial angle (96.1±9.7degrees). RESULT : Lip pressure after alignment and leveling stage (T0) was 24.53 gm/cm2 in class I and 25.62 gm/cm2 in class II division 1. And there was no significant difference in lip pressure variations between ages and gender. The ratio between lip pressure and change in inclination of maxillary anterior teeth is greater in class II division 1 (1:3.248) than in class I (1:3.066) and the lip pressure reduces gradually in both the groups during retraction. Every millimeter of maxillary incisor retraction, the mean reduction in lip pressure was 3.066 g/cm2 and 3.248 g/cm2 in class I and class II division 1 subjects respectively. CONCLUSION : Lip pressure reduces gradually in class I and class II division 1 conditions during retraction and the subjects with class II division 1 malocclusion had greater lip pressure than class I. There was no significant difference in lip pressure variations between ages and gender. The lip pressure at rest after alignment and leveling stage was 24.53 gm/cm2 in class I and 25.62 gm/cm2 in class II div 1 and the ratio between lip pressure and change in inclination of maxillary anterior teeth was 1: 3.248 in class II division 1 cases and 1: 3.066 in class I cases.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | lip pressure, force sensor, class II Malocclusion, maxillary incisors. |
| Subjects: | DENTAL > Orthodontics and Dentofacial Orthopedics |
| Depositing User: | Kambaraman B |
| Date Deposited: | 05 Jan 2018 16:58 |
| Last Modified: | 05 Jan 2018 16:58 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/5256 |
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