Relationship between initial crowding and interproximal force during retention phase

Abstract

This study investigated the change in interproximal force (IPF) in mandibular anterior teeth during retention and the relationship between the irregularity index before orthodontic treatment and the IPF. The effect that an erupting third molar had on IPF was also examined. Forty treated patients (40 with extraction of four bicuspids) were followed for 18 months during the retention phase. The irregularity index was determined from initial plaster casts. The total IPF was determined by measuring the interdental frictional forces at the mandibular anterior teeth by withdrawing a metal strip. The total IPF increased during the retention phase until 18 months, and there was a positive correlation between the irregularity index and total IPF 6 to 18 months after active treatment. An erupting third molar did not affect the total IPF. An increase in the total IPF may be an indication of relapse in mandibular anterior crowding. In conclusion, orthodontists should pay special attention to potential relapse in the lower anterior teeth 6 months after active treatment in cases with severe anterior crowding before treatment.

The Role of Mandibular Third Molars on Lower Anterior Teeth Crowding and Relapse after Orthodontic Treatment : A Systematic Review

“…They found that there was a bilateral decrease in the proximal contact tightness in all contacts. These findings are in agreement with a more recent study by Okazaki [22] who investigated interproximal force change in the anterior teeth of the lower jaw and the effect of the erupting third molars in 40 treated patients. He followed them for 18 months during the retention phase.…”

Impact of extracorporeal shockwave therapy on tooth mobility in adult orthodontic patients: a randomized single‐center placebo‐controlled clinical trial

“…). The severity of the irregularity of tooth position before orthodontic treatment exerts a significant impact on relapse rates in aligned teeth (Okazaki ). The retention material used and the protocol appeared to be sufficient for tooth stabilization.…”

“…Long‐term retention will be needed to stabilize the results of treatment (Blake & Bibby , Edman Tynelius et al. , Okazaki , Thickett & Power , Jaderberg et al. ).…”

Características de los terceros molares inferiores impactados observados por medios radiográficos. Universidad Católica de Santiago de Guayaquil, 2014

“…La clasificación de Winter está basada en la inclinación del eje mayor del tercer molar con relación al segundo molar, por lo cual encontramos siete variaciones: vertical, mesioangular, distoangulado, horizontal, vestibular, lingual, transversal. [12][13][14][15] En el gráfico 1, se realizó estudio de un universo de 100 pacientes, se realizaron 50 muestras de técnicas de anesthesia de tipo Gow Gates y 50 muestras de anesthesia de tipo Akinosi.…”