Biomaterial Database

Variation in function of the masticatory system in 1008 rural children. 1991

R Pahkala, and T Laine

Department of Orthodontics, Faculty of Dentistry, University of Kuopio, Finland.

The aim on the present study was to investigate the variation in function of the masticatory system in 1008 subjects 5 to 15-years-old in a rural community. This study considered the effects of age, gender, developmental stage of the dentition and interexaminer variability. In addition, maximal opening capacity of the mandible was assessed in relation to age, gender and body size. Four dentists performed the examinations combined with routine check-ups, preventive and operative dental treatments. The results showed that the opening capacity in children increases from the age of 6 to the age of 12 with no difference between the sexes. Children of bigger size seem to have larger opening than the smaller ones. Minor differences were found between the sexes, but some variation with age could be seen in signs of craniomandibular disorders (CMD) and in occlusal recordings. Children with RP-IP slide had more often CMD-signs than the ones without this occlusal feature mainly from the instability of occlusion. This is in accordance with the finding of a higher prevalence of muscle tenderness and mediotrusion interferences during the mixed dentition. In general, in children expression of the craniomandibular disorders seems to reflect physiological changes during development of the dentition and occlusion rather than a pathological condition.

UI	MeSH Term	Description	Entries
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
D008410	Masticatory Muscles	Muscles arising in the zygomatic arch that close the jaw. Their nerve supply is masseteric from the mandibular division of the trigeminal nerve. (From Stedman, 25th ed)	Masticatory Muscle,Muscle, Masticatory,Muscles, Masticatory
D008445	Maxillofacial Development	The process of growth and differentiation of the jaws and face.	Development, Maxillofacial,Developments, Maxillofacial,Maxillofacial Developments
D009334	Neck Muscles	The neck muscles consist of the platysma, splenius cervicis, sternocleidomastoid(eus), longus colli, the anterior, medius, and posterior scalenes, digastric(us), stylohyoid(eus), mylohyoid(eus), geniohyoid(eus), sternohyoid(eus), omohyoid(eus), sternothyroid(eus), and thyrohyoid(eus).	Muscle, Neck,Muscles, Neck,Neck Muscle
D012044	Regression Analysis	Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see LINEAR MODELS) the relationship is constrained to be a straight line and LEAST-SQUARES ANALYSIS is used to determine the best fit. In logistic regression (see LOGISTIC MODELS) the dependent variable is qualitative rather than continuously variable and LIKELIHOOD FUNCTIONS are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.	Regression Diagnostics,Statistical Regression,Analysis, Regression,Analyses, Regression,Diagnostics, Regression,Regression Analyses,Regression, Statistical,Regressions, Statistical,Statistical Regressions
D002648	Child	A person 6 to 12 years of age. An individual 2 to 5 years old is CHILD, PRESCHOOL.	Children
D002675	Child, Preschool	A child between the ages of 2 and 5.	Children, Preschool,Preschool Child,Preschool Children
D005260	Female		Females
D005387	Finland	A country in northern Europe, bordering the Baltic Sea, Gulf of Bothnia, and Gulf of Finland, between Sweden and Russia. The capital is Helsinki.	Aland Islands,Åland Islands