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Biomedical subjects

D C Johnsen

Publications and source records attributed to D C Johnsen.

43 records · Page 3Linked to original sources
PubMed1977

Prevalence of delayed emergence of permanent teeth as a result of local factors.

Delayed emergence of permanent teeth as a result of local etiologic factors was found in 45 of 1,032(4.3%) persons ages 8 through 18 in a dentally indigent population. In 36 persons (3.4%) delayed emergence resulted from causes other than those associated with premature primary molar extraction. This statistic probably approximates the potential for this problem in a treated population group. Teeth most commonly involved were mandibular second premolars, maxillary canines, and maxillary central incisors. The most common causes, respectively, were space loss, palatal position, and mesiodens. Supernumerary, malformed, and congenitally missing teeth were more frequent in persons with delayed emergence than in the rest of the population sampled. The difference was statistically significant. No correlation was found between delayed emergence and sex of the patient. In this study, teeth delayed in emergence behaved as other teeth in that they exhibited normal root development and did not contribute to resorption of adjacent roots. Except for maxillary canines, enlarged follicular spaces did not develop after eruption

Adolescent↗
PubMedDate not supplied

Hearing deficits correlated with the timing of systemic disturbance as indicated by primary incisor defects.

A correlation of hearing deficits and enamel defects was investigated in 18 children presenting to a pediatric neurology service for hearing evaluation. Eleven had enamel defects. Five had defects consistent with a systemic insult occurring as early as 14 weeks gestation, two between 29 to 33 weeks gestation, and four near term. Hearing loss was more severe in the five with enamel defects occurring in the mid-trimester (mean = 70 dB), than in the four subjects with defects occurring around term (mean = 23 dB) (t = 3.8; p less than 0.01). Of the remaining two subjects, one had normal hearing and the other had a moderate loss. A correlation was found between the average degree of hearing loss (in dB) versus the estimated time of systemic insult in weeks gestational age as indicated by position of the tooth defect (r = -0.78; p less than 0.01). Neurological profiles also differed with those having early defects being more severe. These findings suggest a differential susceptibility for developing audiological (and possibly other neurological) structures based on insult timing.

Child↗
PubMedDate not supplied

Caries pattern identification in primary dentition: a comparison of clinician assignment and clinical analysis groupings.

The purpose of this study was to compare the assessment of caries patterns by clinical definition and by cluster analysis. One of five etiology-oriented caries patterns was assigned to Head Start children in primary dentition. Cluster analysis grouped children based on carious tooth surfaces for each child. One hundred twenty-seven of the 155 children with at least one carious lesion fell into clusters of at least four children. At least two-thirds of the subjects in each cluster were assigned to a single caries pattern. The largest cluster of 70 children had 66 of its subjects assigned to the pit and fissure pattern. The second largest cluster of 26 children had 20 of its subjects assigned to the faciolingual pattern (intended to identify bottle caries). This study is interpreted to reinforce the notion that caries in the primary dentition occurs in fairly distinct patterns.

Child, Preschool↗