[Long-term stability of orthodontic treatment].

Aim of this study was to assess long-term stability of orthodontic treatment in a sample of 1016 patients until 10 years postretention. Treatment outcome was measured with the PAR-index at 6 different stages. The mean age of the patients was 12.

Stability of orthodontic treatment outcome: follow-up until 10 years postretention.

Dental casts of 1016 patients were evaluated for the long-term treatment outcome using the Peer Assessment Rating (PAR) index. The PAR index was measured at the pretreatment stage (n = 1016), directly posttreatment (n = 783), postretention (n = 942), 2 years postretention (n = 781), 5 years postretention (n = 821), and 10 years postretention (n = 564). The mean absolute change as well as the percentage of change per year (relapse) related to the postretention stage was calculated.

Orthodontic treatment need prior to treatment and 5 years postretention.

Objectives: To assess orthodontic treatment need prior to treatment and 5 years postretention in a large university sample.

Methods: A random sample of 920 patients (400 male and 520 females) from the Department of Orthodontics and Oral Biology, University of Nijmegen, the Netherlands, were included in this study. Dental casts were evaluated using the Index of Orthodontic Treatment Need (IOTN) at the pretreatment (TP) and 5-year postretention stages (T5).

Occlusal outcome of orthodontic treatment.

The aim of this study was to evaluate the overall quality of orthodontic treatment in a university clinic. Dental casts of 1870 patients (799 males and 1071 females) were evaluated at the pretreatment and posttreatment stages using the PAR index. The mean age was 13 +/- 4.

Assessment of dental and facial aesthetics in adolescents.

The Index of Orthodontic Treatment Need (IOTN) is currently widely used for clinical, as well as epidemiological purposes. The Aesthetic Component (AC) of this index focuses on dental aesthetics and does not include facial aesthetics. The aim of the present study was to evaluate whether dental aesthetics as measured by the AC of the IOTN correlates with facial aesthetics.