Oxis contacts in permanent dentition A study cast radiological and clinical assessment

Abstract

There is limited information to Andrews fifth key to normal occlusion This study evaluated variations in contacts of the permanent dentition in casts and their location with existing CBCTs and assessed the changes at the end of orthodontic treatment and one year later In Phase 1 343 casts matching the inclusion and exclusion criteria were classified based on OXIS In Phase 2 125 CBCTs were assessed for variation in interproximal contacts and their location In Phase 3 interproximal contact data of 30 patients were obtained at three time points T0 beginning of treatment T1 end of fixed appliance treatment and T2 one year post treatment Phase 1 showed that among the posterior contacts I contact 38 point 4 percent was the most prevalent followed by X 38 point 3 percent S 22 point 2 percent and O 1 point 1 percent Among the anterior contacts X contact 30 percent was the most prevalent followed by S2 24 point 6 percent O 21point 3 percent S1 15 point 2 percent and I 9 point 4 percent CBCT assessment showed X contact 41 point 7 percent for posteriors and 38 point 6 percent for anteriors to be most prevalent Interproximal contacts changed significantly from T0 to T1 Broader contacts were observed at T1 and T2 in the posterior segments At T2 changes in interproximal contacts were not statistically significant for most maxillary contacts while it was statistically significant in majority of the mandibular contacts OXIS classification was applicable to permanent dentition contacts At T1 and T2 broader contacts were observed with an interchange between I and S contacts These changes happened more in the mandibular contacts newline