Success rates in periodontal treatment as related to choice of evaluation criteria - Presentation of an evaluation criteria staircase for cost-benefit use

Background, aims: The aim of the present investigation was to determine the success rates of treatment of 36 patients with moderate to advanced period ontal disease as related to different clinical and radiographic criteria. Method: The treatment comprised oral hygiene education, subgingival scaling and root planing, and when judged indicated, periodontal surgery An "evalu ation criteria staircase" comprising 5 levels was introduced to be utilized for evaluation of the treatment results in 4 proximal sites (1 in each qua drant) which were followed for 3 years. The highest level of the staircase (level 1) is the most challenging and comprises the traditonal criteria for "perfect" periodontal health, while the lower levels are gradually less de manding. Results: At the follow-up examination 3 years after active treatment, 52.1% of the experimental sites fulfilled the criteria for successful treatment according to level 1. On the lowest level (level 5) which only required no further loss of alveolar bone for treatment to be considered "successful", the number of such treated sites reached 95.1%. The present data showed tha t even if level 5 was accepted as the evaluation criterion for "success", r esulting in very few failed sites (4.9%), these sites may demand considerab le extra clinical time and costs far retreatment because of their distribut ion among many individuals (13.2%). This clinical time increases substantia lly if higher levels of success are desired. From a cost-benefit point of v iew, it is therefore of utmost importance that not only patient compliance but also disease resistance and the value of the affected tooth for the den tition are taken into consideration when the indications for retreatment ar e weighed. This is especially important since many sites were found to be n on-progressive for a long time, even though they did not exhibit perfect pe riodontal health. Conclusions: It is suggested that the "evaluation criteria staircase" prese nted in this paper might be a helpful clinical instrument for decision-maki ng in individually designed and site-related retreatments of patients with periodontal disease.