Juvenile periodontitis Localization of bone loss in relation to age, sex, and teeth

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Abstract
The distribution of bone loss in 156 patients, 12–32 years old, with juvenile periodontitis was analyzed according to age, sex, and teeth affected. The criteria for bone loss were: vertical or horizontal bone loss involving more than one‐third of the root as judged by radiographs. Three age groups were established: 12–18, 19–25, and 26–32 years old. Three types of bone loss localization were defined: I. First molars and/or incisors. U. First molars, incisors and some additional teeth (total <14 teeth). III. General involvement. There was a dominance of female patients. The ratio females: males decreased from 5.3:1 in the youngest age group to 1.5:1 in the oldest. The mean number of involved teeth increased with age from 5.3 teeth in the youngest group to 11.6 in the oldest. The frequency of type I bone loss decreased from 55% in the youngest group to 7% in the oldest. Type 11 occurred with the same frequency (55–58%) in all three age groups. Type III was not seen in the youngest group whereas it increased from 17 % in the middle to 35 % in the oldest group. Of the total number of involved teeth, the first molars were most frequently affected, followed by the incisors. Maxillary teeth were involved to a slightly higher degree than mandibular teeth, and there was a strong “mirror effect” between involved teeth of right and left jaw halves.

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