Variation of upper lip pressure on upper teeth during non-extraction orthodontic treatment: A prospective clinical study
| Autor: | Elie Khoury, Rania Nassar, Joseph Ghoubril, Marwan El Helou |
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| Rok vydání: | 2019 |
| Předmět: |
Male
Palatal Expansion Technique Adolescent Orthodontics Orthodontics Corrective 03 medical and health sciences 0302 clinical medicine stomatognathic system Swallowing Recurrence Maxilla Pressure Medicine Humans Maxillary central incisor 030212 general & internal medicine Prospective Studies Child Upper teeth Rest (music) business.industry Bracket Upper lip 030206 dentistry Pressure sensor Lip Incisor stomatognathic diseases Prospective clinical study Linear Models Female business Malocclusion |
| Zdroj: | International orthodontics. 17(4) |
| ISSN: | 1879-680X |
| Popis: | Summary Objective The objectives of this prospective clinical study are to quantify the variation of pressure exerted by the upper lip on the upper teeth during the alignment phase and to evaluate its capacity to adapt to changes in dental position. Materials and methods Thirty young subjects in skeletal Class I relationship requiring non-extraction orthodontic treatment were included in this study. The pressure exerted by the upper lip on the upper central incisors and right canine were measured during rest and swallowing positions using a pressure transducer before bracket placement (T0), after bracket placement (T1), three months (T2) and six months later (T3). Maxillary intercanine width (CC), upper arch length (U) and crowding (C) were measured on stone models at T1, T2 and T3 to determine the existence of a correlation between the variation of lip pressure and these variables. Results The lip pressure significantly increased after bracket placement and remained relatively stable during the six-month period. The labial pressure on the incisors was the only variable to significantly decrease at T3, though remaining significantly higher than the starting pressure. A positive correlation was found between the variation of the inter-canine distance and the labial pressure on the canine at rest whereas a negative correlation exists between the crowding and the labial pressure on the incisors at rest. Conclusion This study showed that increasing inter-canine width disrupts the muscle equilibrium and therefore is prone to relapse, whereas the upper lip can better adapt to the protrusion of upper incisors. |
| Databáze: | OpenAIRE |
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