Biomaterial Database

Associations between upper lip activity and incisor position. 2010

Nihat Kilic

Department of Orthodontics, Faculty of Dentistry, Atatürk University, Erzurum, Turkey. nkilic@atauni.edu.tr

BACKGROUND Muscle activity in the upper lip may influence the positions of the upper and lower incisors. OBJECTIVE To determine the associations between muscle activity in the upper lip and the inclinations of the incisors, overjet and overbite. METHODS Forty-five subjects (29 girls, 16 boys), between 11 and 15 years of age with predominantly Class I malocclusion, were used. The inclinations of the incisors, overjet and overbite were measured on lateral cephalometric radiographs. Bipolar electrodes were placed on the upper lip to record the activity in orbicularis oris muscle at rest, during maximal clenching, chewing hazelnuts and swallowing. Correlation coefficients between the cephalometric variables and the electromyographic (EMG) activity in the upper lip were calculated. RESULTS There was no gender difference in the EMG activity in the upper lip. There were no statistically significant associations between the EMG activities in the upper lip and the inclinations of the incisors, overjet and overbite. CONCLUSIONS The positions of the incisors do not appear to be influenced by muscle activity in the upper lip.

UI	MeSH Term	Description	Entries
D007180	Incisor	Any of the eight frontal teeth (four maxillary and four mandibular) having a sharp incisal edge for cutting food and a single root, which occurs in man both as a deciduous and a permanent tooth. (Jablonski, Dictionary of Dentistry, 1992, p820)	Incisors
D008046	Lip	Either of the two fleshy, full-blooded margins of the mouth.	Philtrum,Lips,Philtrums
D008297	Male		Males
D008310	Malocclusion	Such malposition and contact of the maxillary and mandibular teeth as to interfere with the highest efficiency during the excursive movements of the jaw that are essential for mastication. (Jablonski, Illustrated Dictionary of Dentistry, 1982)	Angle's Classification,Crossbite,Tooth Crowding,Cross Bite,Angle Classification,Angles Classification,Bite, Cross,Bites, Cross,Classification, Angle's,Cross Bites,Crossbites,Crowding, Tooth,Crowdings, Tooth,Malocclusions
D008311	Malocclusion, Angle Class I	Malocclusion in which the mandible and maxilla are anteroposteriorly normal as reflected by the relationship of the first permanent molar (i.e., in neutroclusion), but in which individual teeth are abnormally related to each other.	Angle Class I,Class I, Angle
D008312	Malocclusion, Angle Class II	Malocclusion in which the mandible is posterior to the maxilla as reflected by the relationship of the first permanent molar (distoclusion).	Angle Class II,Angle Class II, Division 1,Angle Class II, Division 2,Class II Malocclusion, Division 1,Class II Malocclusion, Division 2,Malocclusion, Angle Class II, Division 1,Malocclusion, Angle Class II, Division 2,Class II, Angle
D008313	Malocclusion, Angle Class III	Malocclusion in which the mandible is anterior to the maxilla as reflected by the first relationship of the first permanent molar (mesioclusion).	Angle Class III,Habsburg Jaw,Hapsburg Jaw,Prognathism, Mandibular,Underbite
D008409	Mastication	The act and process of chewing and grinding food in the mouth.	Chewing
D009119	Muscle Contraction	A process leading to shortening and/or development of tension in muscle tissue. Muscle contraction occurs by a sliding filament mechanism whereby actin filaments slide inward among the myosin filaments.	Inotropism,Muscular Contraction,Contraction, Muscle,Contraction, Muscular,Contractions, Muscle,Contractions, Muscular,Inotropisms,Muscle Contractions,Muscular Contractions
D002508	Cephalometry	The measurement of the dimensions of the HEAD.	Craniometry

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