Complications encountered during Forsus Fatigue Resistant Device therapy.

Sherif A Elkordy,Mona M Salah Fayed,Khaled H Attia,Amr M Abouelezz

doi:10.1590/2177-6709.25.3.065-072.oar

Sherif A Elkordy, Mona M Salah Fayed + Show 2 more

Open Access

https://doi.org/10.1590/2177-6709.25.3.065-072.oar

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Abstract

ABSTRACTIntroduction: Fixed functional appliances are non-compliant solutions to Class II malocclusion treatment. The clinician, however, should be careful of unexpected complications during the therapy. Methods: 58 female adolescents who presented with Class II malocclusion due to deficient mandible were treated with Forsus Fatigue Resistant Device (FFRD) therapy until an overcorrection to an edge to edge incisor relationship was achieved. Results: Incisor relationship and overjet were corrected successfully in all the subjects. Twenty-two patients had a complications-free treatment, while several complications were encountered with the remaining 36 subjects. In particular, mandibular canine rotation and development of posterior crossbites were the most common complications, with percentages of 51.7% and 25.9% respectively. Other complications included the breakage and shearing of the extraoral tubes of the first molar bands, and excessive intrusion of the upper first molars. Conclusions: FFRD is an efficient appliance for treatment of Class II malocclusion; however, different complications were encountered during the appliance therapy. A focus on taking precautions and applying preventive measures can help to avoid such problems, reducing the number of emergency appointments and enhancing the treatment experience with the appliance.

Highlights

Fixed functional appliances are non-compliant solutions to Class II malocclusion treatment
Fixed functional appliances were introduced as compliance-free options for treatment of Class II malocclusion
A recent systematic review investigated the prevalence of complications with fixed functional appliances, and stated that the incidence of complications is relatively high.[12]

Summary

Introduction

Fixed functional appliances are non-compliant solutions to Class II malocclusion treatment. Conclusions: FFRD is an efficient appliance for treatment of Class II malocclusion; different complications were encountered during the appliance therapy. The Forsus Fatigue Resistant Device[3] (FFRD) (3M Unitek, Monrovia, Calif, USA) was introduced after the earlier Forsus Flat Spring,[4] and was reported to be successful in the treatment of Class II malocclusion[5,6,7] and well accepted by the patients.[8,9,10,11] A recent systematic review investigated the prevalence of complications with fixed functional appliances, and stated that the incidence of complications is relatively high.[12] Studying the complications induced by orthodontic appliances has two main aspects: the clinician’s observations and the patients’ responses to assessment questionnaires. The clinical perspective was previously reported with the Herbst appliance.[13,14,15,16] Previous studies that investigated the complications of FFRD were based on patient reporting and acceptance questionnaires.[8,9,10,11,17]

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Conclusion