AbstractThe 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
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