Mohammadkarim Soltani; Farzaneh Golfeshan; Reza Mahvelati Shamsabadi
Abstract
Background and aim: Clinical signs of tooth-size- arch length discrepancy are crowding, impaction, and incisor proclination. The controversy persists over whether to increase the size of the arch by expansion or decrease the size of the teeth by interproximal enamel reduction or extraction to resolve ...
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Background and aim: Clinical signs of tooth-size- arch length discrepancy are crowding, impaction, and incisor proclination. The controversy persists over whether to increase the size of the arch by expansion or decrease the size of the teeth by interproximal enamel reduction or extraction to resolve the discrepancy.Method: This report describes the treatment of a 17-year-old girl with a severe tooth size-arch length discrepancy. The patient had a mild Class II skeletal relationship, a high mandibular plane angle, a Class I molar relationship, bilateral posterior cross bites, and deviated midlines. The final treatment protocol was non-extraction treatment of both arches using passive self-ligate brackets. Results and Conclusion: The final treatment result was satisfactory. Proper over- bite and over jet, facial balance and good occlusion were achieved. Expansion of posterior segments and distal movement of molars solved tooth size-arch length discrepancy.
Amirfarhang Miresmaeili; Nasrin Farhadian; Khosrou Mani Kashani; Hamidreza Moradi
Abstract
Aim: Lips-Dentition relationships play a special role during smile. Present study compared the relationship of lips and teeth during posed smile in subjects with normal occlusion, class 1 malocclusion and non-extraction treated cases.
Materials and methods: 20 cases with normal occlusion according to ...
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Aim: Lips-Dentition relationships play a special role during smile. Present study compared the relationship of lips and teeth during posed smile in subjects with normal occlusion, class 1 malocclusion and non-extraction treated cases.
Materials and methods: 20 cases with normal occlusion according to Andrews' and without facial malformation (N), 22 cases with moderate crowding (C 1) and 12 well treated patients without any extraction and facial malformation (T) with the age between 15 — 20 years old were selected. One photograph in rest position and another in posed smiling were taken in standard position. 12 variables on photos were measured by use of a smile mesh. ANOVA and Krukal-wallis tests were used for analysis.
Results: Commissure width and Smile width was significantly greater in group N than groups Cl and T (P<0.001). Upper lip curvature in non-extraction treated group was concave but in others were convex (P<0.022). Inter-canine width in group N was significantly higher than treated patients (P<0.03).
Conclusion: There is a direct relation between anatomic form of lips in rest and in smiling. Orthodontic treatment can cause some changes in lips form during smiling (IJO 2006; 1:163-7).