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CORRELATION BETWEEN MEASURED PARAMETERS OF RISK AND PROGNOSIS IN SUBJECTS WITH CHRONIC PERIODONTITIS.

Aims:In most ofcases,clinical parameters associated with poor prognosis are the same as the factors associated with increased risk, but the relationship between risk and prognosis remains unclear.The objective of this study was to evaluate the correlation between measured parameters of predictive risk and prognosisin subjects with chronic periodontitis. Methods: 300 subjects participated in the study. Modified periodontal risk assessment model (MPRA) was used to assess the risk and prognosis was evaluated by using McGuire and Nunn prognostic criteria. Results:Among the subjects, 57.3%, 38% and 4.7% were categorized as having high, low and medium risk respectively. Assessment of prognosis among study subjects showed that 38.0%, 24.0%, 17.7%, 17.0%, 2.0%and1.3% had good, fair, excellent, poor, hopeless and questionable prognosis respectively. Though majority of the subjects had good prognosis (114 subjects;38%), there was a substantial variability in the distribution of the measured parameters as per the risk scores within this cohort. A strong positive correlation was seen between prognosis and probing depth (PD)[≥]5mm. There was a weak, but statistically significant correlation between predictive risk from MPRA and various types of prognosis(rs=0.507;p<0.001). Conclusion:The measures used to assess risk and prognosis are almost similar;butthe weak correlation between risk and prognosisseems to suggest that an increased risk of developing periodontal disease need notnecessarily indicate a bad prognosis.