Abida Ijaz.
A comparative study of two molar distalization appliances.
Pak J Orthodont Ped and Comm Dentistry Jan ;1(1):27-32.

Class II malocclusion with moderate space deficiency in the maxillary arch and relatively well-aligned mandibular dental arch can be treated in many ways. One possibility to treat without extraction is to distalize the maxillary first molars to a class I molar relationship in order to gain space in the lateral segments, for retraction of cuspids and anterior teeth. The aim of this study was to compare the clinical effects of two different molar distalization devices. 29 patients having class II malocclusion with low angle or normal angle were involved in the study. The I.B.M.D (Infra Oral Bodily Molar Distalizer) which is a fixed appliance, consisting of two pre-activated molar distalization springs bent in TMA wire 0.032 x 0.032 inch and a modified Nance to maintain anchorage, was used for 14 patients. The A.C.C.O (Acrylic Cervical Occipital Anchorage) appliance being a combination of fixed and removable appliance that consisted of an acrylic plate with 2 finger springs and a modified labial section containing groove for the anterior elastic along with cervical head gear, was given to 15 patients. The I.B.M.D and A.C.C.O were used for the mean period of 7.2 months and 11 months respectively. Measurements were made from the lateral cephalogram tracings before and after molar distalization. The results showed that with I.B.M.D the maxillary first molar distalized bodily an average of 4.5 mm and the anchorage loss was 4.75 mm on average. Whereas with A.C.C.O the mean distal movement of the maxillary first molar was 4.38 mm with mesial tip of 3.03 degree. However, the anchorage loss with A.C.C.O appliance was less being 2.11 mm on an average due to the use of the head gear. The I.B.M.D. appliance was not patient dependent whereas with A.C.C.O. patient`s compliance was found to be a must.

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