Stability and relapse after orthodontic treatment of deep bite cases--a long-term follow-up study

Abstract

The purpose of this long-term follow-up study was twofold-firstly, to assess prevalence of relapse after treatment of deep bite malocclusion and secondly, to identify risk factors that predispose patients with deep bite malocclusion to relapse. Sixty-one former patients with overbite more than 50% incisor overlap before treatment were successfully recalled. Clinical data, morphometrical measurements on plaster casts before treatment, after treatment and at long-term follow-up, as well as cephalometric measurements before and after treatment were collected. The median follow-up period was 11.9 years. Patients were treated by various treatment modalities, and the majority of patients received at least a lower fixed retainer and an upper removable bite plate during retention. Relapse was defined as increase in incisor overlap from below 50% after treatment to equal or more than 50% incisor overlap at long-term follow-up. Ten per cent of the patients showed relapse to equal or larger than 50% incisor overlap, and their amount of overbite increase was low. Among all cases with deep bite at follow-up, gingival contact and palatal impingement were more prevalent in partially corrected noncompliant cases than in relapse cases. In this sample, prevalence and amount of relapse were too low to identify risk factors of relapse.

Long-term stability of curve of Spee levelled with continuous archwires in subjects with different vertical patterns: a retrospective study

“…In the cases with dentoalveolar deep bite and successful treatment with subsequent retention by fixed retainers and a temporary removable upper plate, the prevalence and degree of deep bite relapse were relatively small and clinically insignificant (37).…”

Retention: taking a more active role

“…36 In a long-term study on deep bite patients, in which relapse was defined as an increase in incisor overlap to 50% or greater, only 10% of the study population displayed relapse when followed for an average of 11.9 years. 37 Although there is little data regarding methods of retention in deep bite cases, extraction does not seem to be a key factor in the stability of the results. According to a Cochrane review conducted in 2017, there is little evidence-based literature regarding the efficacy of extraction versus non-extraction orthodontic treatment in resolving deep bite malocclusion in class II division 2 cases.…”

Correction of Malocclusion by Botulinum Neurotoxin Injection into Masticatory Muscles

“…The status of malocclusion has been frequently found in mandibular retrognathism [ 77 ]. For the surgical correction of this malocclusion, the position of the mandible usually moves downward and the myohyoid muscle receives tension [ 78 ] ( Figure 4 ). Accordingly, relapse after treatment occurs at a high frequency, regardless of treatment protocol [ 79 , 80 ].…”