Validity and relevance of the criteria of the CPITN

The validity and relevance of the criteria used in the CPITN index are considered against the background of their use throughout the world in the last 15 years. Overall the CPITN criteria satisfy both measures, although some suggestions are given for further refinements. It is recommended that, in conjunction with the Periodontal Screening and Recording system, a simplification to five code numbers for both findings and treatment needs be considered. Other matters considered should include the discontinuation of the description 'shallow pocket', training in the use of a 20 g probing force and a lowering of the age at which periodontal screenings are commenced for children.