Periodontal treatment needs assessed by the use of clinical and radiographic criteria.

The aim of the present study was to use a decision making model in order to assess the periodontal treatment needs of a random sample of employees in a large Swedish industrial corporation. The model used provided data on critical bone loss limits for different tooth types and ages, beyond which treatment must be initiated, in order to fulfill the goal of maintaining all teeth in a functional state throughout life. A sample comprising 192 subjects belonging to four age strata (31-35 yr, 41-45 yr, 51-55 yr, and 61-65 yr) was involved. From each subject, a full mouth series of intra-oral radiographs were available. The radiographic bone height was assessed at the mesial and distal aspect of all teeth by measuring the distance between the cementoenamel junction and the bone crest. The clinical examination included assessments of plaque, gingivitis, probing pocket depth, and probing attachment level. The results revealed that (i) only 3.1% of all approximal tooth sites exhibited radiographic bone loss exceeding the critical limit, (ii) all individuals and 70% of the approximal tooth sites were in need periodontal treatment when presence of gingival inflammation (bleeding on probing) was employed as the single criterion for therapeutic intervention, (iii) the proportion of individuals and tooth sites requiring treatment amounted to 98% and 27%. respectively, when a probing pocket depth of at least 4 mm was included as an additional criterion, and 54% and 4.1%, respectively, if a probing depth threshold of 6mm was used, while (iv) the use of bleeding on probing in combination with radiographic bone loss beyond the critical limits disclosed a need of treatment in 40% of the subjects and 2.5% of the approximal tooth sites.