Treatment Of Class Ⅱ Low Angle Deep Bite With Inter-arch Elastics And Reverse Curve Archwire

Objectives: The objectives of this study were to investigate the correction of aClass II division2deep overbite malocclusion with the use of inter-arch elastics andreverse curve arch wire as well as their effects in improving the lower anterior facial height.Subject and Methods: The subject treated in this study was a14year old femalepatient with a Class II division2Angle’s malocclusion with a skeletal deep bite of around6mm and an overjet of1.5mm, deep curve of Spee, coinciding upper and lower archmidlines with that of the facial midline. After analyses made, the case was treated withoutany extractions due to the fact that she was a low angle patient with minimal amount ofcrowding in both the arches and also a Combination Factor of171.50(greater than155.90)which represents the balance of both the vertical and horizontal dimensions. The AnteriorPosterior Dysplasia Indicator value fell within the normal range indicating a Class Ihorizontal maxilla-mandibular relationship. The duration of the treatment was around20months. After achieving the goals of the treatment, cephalogram was taken and the pre andpost treatment variables compared.Results: The correction of the deep overbite condition was achieved successfullyalong with the correction of the molar relationship into a Class I occlusion. U1-SN hasincreased by50and U1-NA increased by4.50together with a decrease in the inter-incisalangle by8.50contributing to a decrease in bite depth. The assessment of the cephalometricfindings showed that the lower anterior facial height change was minimal but notinsignificant partly due to the continued growth of the mandible which can be confirmedthrough the values of FMA which shows an increase in20, Facial Height Index droppingfrom0.89to0.88and the TPFH:TAFH values decreasing by0.8%. But this change was notenough though to have a positive impact on the facial appearance of the subject. Change in the molar relationship was aided by the use of inter-arch elastics and the deep bitecorrection facilitated by the slight rotation of the occlusal plane caused by extrusion oflower first molar along with the flaring and flaring of the lower incisors induced throughthe use of the reverse curve archwire.Conclusion: Inter-arch elastics and reverse curve archwire can be used successfullyin the treatment of deep bite malocclusions and are two of the most common methodsavailable. Careful diagnosis and treatment planning is primordial for choosing the righttreatment modality which can vary from patient to patient.