Stability of overjet, overbite and upper intermolar width following segmental osteotomy of the maxilla

Aim: The aim is to assess stability of overjet, overbite, and upper intermolar width after the orthodontic-surgical correction of orthodontic anomaly with segmental H-osteotomy of the maxilla. Material and method: The retrospective study works with 40 patients who underwent the segmental osteotomy of the maxilla. Each patient had aɸcomplete orthodontic documentation before the therapy (T1), prior to the surgery (T2), after aɸcompletion of an orthodontic treatment (T3) and approx. 25 months after aɸremoval of fixed appliance, minimum of 1 year after the completed orthodontic treatment and at least 1.5 years after the orthognathic surgery (T4). In every time interval, aɸdigital model of aɸdentition was made to measure the overjet, the overbite and the upper intermolar width. Results: During aɸ long-term check-up the value of the overjet showed aɸ clinically and statistically insignificant decrease by 0.1 ± 0.5 mm. The overbite also showed aɸclinically insignificant decrease by 0.1 ±0.5 mm; in none of the cases there was aɸclinically significant bite opening. The average value of the upper intermolar width was 38.9 ±3.1 mm before the beginning of therapy, prior to orthognathic surgery the value increased due to orthodontic treatment by 0.5 ±1.7 mm. After the active therapy completion, the value increased by 0.9 ±1.7 mm, i.e. by 1.4 ± 2.6 mm compared to the initial condition. In aɸlong-term check up, the average loss of uper intermolar width by 0.4 ±0.7 mm was recorded.