Özet:

Objective: The aim of this study was to examine dentoalveolar compensation and symphysis morphology related to variations in vertical growth direction in skeletal Class 1 individuals. Materials - methods: This study was carried out on a total of 45 individuals with Class I malocclusion who have been divided into three main groups according to their vertical SN/GoGn angles.  Angular and millimetric measurements were conducted in the direction of the parameters determined on the pre-treatment lateral cephalometric radiographs of the subjects constituting the research groups. In statistical analysis, ANOVA (analysis of variance) and Duncan test was used. In addition, the Pearson correlation analysis revealed the relationship between the determined parameters. Results: The difference in U1/PP, IMPA measurements were statistically significant in the comparisons of Class I vertical direction subgroups (P <0.05). There were no statistically significant difference in U1/L1 measurement (p>0,05). The difference in U1PP, U6PP, L1MP measurements were statistically significant (p<0,05). As the vertical heights increased, maxillary and mandibular anterior dentoalveolar heights also increased (p<0,01). The difference in B'-Pg'-Me, Pg'-Me-Pg, BoMeGo, IdoBoMe measurements were statistically significant (p<0,05). Statistically significant differences were found for Ido-Bo, Bo-Me measurements (p<0,01). Conclusion: In skeletal Class I patients with ideal overjet and overbite, upper and lower incisors were positioned more retruded as the vertical facial heights increased. However the interincisal angle was not affected. In hyperdivergent patients the posterior contour of symhysis was flat, however curved in hypodivergent patients. In class I hyperdivergent individuals, the increase of upper symphysal height plays an active role in preventing the formation of the previous open bite.

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