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Biomedical subjects

C F Moorrees

Publications and source records attributed to C F Moorrees.

At least 19 recordsLinked to original sources
PubMed1991

Growth and development in orthodontics.

Growth and development comprise the infrastructure of clinical diagnosis and treatment planning in orthodontics. The two current key issues have been growth prediction and growth stimulation induced by functional appliances. The stability of results in orthodontics and in the combined orthognathic-orthodontic treatment modality are likewise linked to growth and development. Changes in the untreated dentition after the permanent teeth are present in the mouth provide another important frame of reference for the clinician. The hazards of cephalometric analysis when relying on intracranial reference lines has recently captured a wave of attention, and if comprehended, should revitalize cephalometrics in clinical practice and in research.

Activator Appliances↗
PubMed1991

The mesh diagram for analysis of facial growth.

Facial growth of twins by means of proportionate analysis of changes in the location of landmarks within a rectilinear coordinate system (mesh diagram) has been conducted, utilizing cephalometric data on 148 males and 128 females, observed annually from 8 to 16 years of age. Findings show relative consistence of the facial configuration during this 8 year time period, which includes the adolescent growth spurt. The median face in each sex shows little change in the location of soft and hard tissue landmarks, except for slight advancement of the chin as well as dorsal and caudad movement of Gonion. Nonetheless, individual variations in landmark location after 8 years of growth among the subjects studied signal the hazards of prediction within the precise framework that orthodontists seek.

Adolescent↗
PubMed1978

Associations in emergence age among permenent teeth.

Associations in the timing of emergence among the permanent teeth of Boston children were obtained from a mixed longitudinal growth study of 414 Caucasian twin pairs examined annually. Correlations were estimated by the method of maximum likelihood for corresponding left-right teeth, upper-lower teeth, and all paired combinations from central incisor to second molar in a jaw quadrant of each sex. Strong positive correlations in emergence timing prevailed throughout the dentition. Principal component analyses on correlation matrices of jaw quadrant relations for boys and girls in the maxilla and mandible showed that three components effectively explained the emergence associations among the seven permanent teeth in each jaw quadrant. Factor analytic techniques further illustrated the nature of the three components and showed the emergence relations to be essentially the same in the maxilla and mandible for both sexes. The first component was a general maturation factor influencing all of an individual's teeth to be simultaneously early or late in emerging. The remaining two components were a molar factor, affecting almost exclusively the emergence timing of the permanent first and second molars, and a duration factor that affected the duration of the emergence process for non-molar teeth, contrasting particularly the incisors and premolars.

Adolescent↗
PubMed1978

A step function model using tooth counts to assess the developmental timing of the dentition.

Step functions representing median attainment ages of successive counts on numbers of permanent teeth present in the mouth were obtained separately for 12 early-emerging teeth (I1, I2 and M1) and for 16 late-emerging teeth (C, Pm1, Pm2, and M2). Displacement of each step function to best fit of individual tooth counts defined the variation in dental maturation for early teeth and for late teeth. Moreover, differences in the displacements of the two-step functions defined individual variations in the duration of the emergence process.

Age Factors↗