Abstract
Aims: The aims of this study was to evaluate the relationship of lateral dentoskeletal morphology to the amount of dental crowding in patients with Class II malocclusion. Materials and Methods: Study models and lateral cephalometric radiographs of a Class II malocclusion of 62 Iraqi patients(18-25 years) lived in the center of Mosul City (30males and 32 females), were evaluated. The sample was divided into two groups according to severity of pretreatment mandibular crowding. Group 1 consisted of 30 patients and have crowding ≥ 3 mm. Group 2 have 32 patients and crowding Results: Significant differences between crowding less than 3mm and crowding groups more than 3mm were seen in posterior facial height ( S-Go) , the angle between sella, nasion and occlusal plane line ( S-N-Ocp) and the angle between sella, nasion and the long axis of lower central incisor (S-N-L1) in males, while in females, the significant differences were seen in the angle between sella, nasion and the long axis of lower central incisor (S-N-L1) and the angle between Sella–nasion line and mandibular plane(NS- GoMe). The other parameters showed no significant differences. The correlation coefficients of the amount of crowding with all the measurements were studied. Some of them showed a positive correlation, while others showed a negative one. Conclusions: Subjects with Class II malocclusion and different amount of dental crowding have no significantly relation with skeletal parameters. Results suggest that dental crowding is independent of the skeletal measurements.
Highlights
The determination of the factors contributing to mandibular anterior crowding, especially in the early mixed dentition stage, is of great importance for treatment planning.[1]
The angle between anterior cranial base and mandibular plane (S-N:GoMe),basal plane angle( SPP:Go-Me), Sum [Bjork], Y-axis angle, and Lower gonial angle (N Go Me) tended to increase and Posterior/anterior facial height ratio (SGo/N-Me), Ramal plane (Ar-Go), andAnterior facial height (N-Me) tended to decrease.[16]. In general, patients with Class II malocclusion have a smaller mandibular length than subjects with normal occlusion and Class I malocclusion.[17,18] the objective of this study was to evaluate the relationship of dentoskeletal parameters to the amount of dental crowding in patients with complete Class II malocclusion
Cephalometric measurements: Berg[23] compared cephalometric variables of patients with and without crowding and found that variables related to lower jaw dimensions (Ar-Po, SNB) had significantly smaller values in the crowded group while the result of the present study show no significant differences between the most of the cephalometric variables and crowding and this result agree with Montasser and Taha[24] who suggest that dental crowding is independent of the skeletal measurements
Summary
The determination of the factors contributing to mandibular anterior crowding, especially in the early mixed dentition stage, is of great importance for treatment planning.[1]. Class II an association was found between the overjet value and the tendency toward a hyperdivergent pattern. The angle between anterior cranial base and mandibular plane (S-N:GoMe),basal plane angle( SPP:Go-Me), Sum [Bjork], Y-axis angle, and Lower gonial angle (N Go Me) tended to increase and Posterior/anterior facial height ratio (SGo/N-Me), Ramal plane (Ar-Go), andAnterior facial height (N-Me) tended to decrease.[16] In general, patients with Class II malocclusion have a smaller mandibular length than subjects with normal occlusion and Class I malocclusion.[17,18] the objective of this study was to evaluate the relationship of dentoskeletal parameters to the amount of dental crowding in patients with complete Class II malocclusion
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