When it comes to orthodontic assessments, the Treatment Priority Index (TPI) is the classification system used. Developed by Grainger, this index is used to evaluate the severity of malocclusion, the degree of disability, and the treatment priority. The PAR index is also accepted as a valid method for assessing the need for orthodontic treatment in terms of angle classification. To ensure accuracy, study models must be trimmed so that the upper and lower bases are parallel to the occlusal plane.
Traditionally, orthodontic study models are trimmed so that the heels and sides are flush. Given this information, it would be more reliable to use alternative indices instead of a single index for orthodontic cases to assess the need for treatment. This was proven in a study that included 607 consecutive patients aged 9 to 18. The PAR index was used as a method for measuring malocclusion and treatment effectiveness, but not as a way to assess orthodontic treatment needs. The DAI was used as a reference standard to determine the cutoff points of the PAR index.
Before starting orthodontic treatment, a complete examination (including x-rays) and an evaluation of the occlusion are necessary. In adults, skeletal malocclusion requires orthodontic treatment combined with orthognathic surgery. It is important to note that an opinion on orthodontics should not be sought if the child in question is happy with their occlusion and does not want to consider braces. In conclusion, when it comes to orthodontic assessments, the Treatment Priority Index (TPI) is the classification system used.
This index is used to evaluate the severity of malocclusion, the degree of disability, and the treatment priority. Alternative indices can also be used instead of a single index for orthodontic cases to assess the need for treatment.
