The influence of orthodontic non-extraction treatment on the change in the inclination and position of incisors in the Europoid race

Abstract

AIM: To detect post-treatment change in the inclination and position of incisors in cases treated with orthodontic non-extraction therapy. MATERIALS AND METHODS: The group consisted of 102 patients without extractions in lower and upper dental arch during orthodontic treatment. Cephalogram examination evaluated the position of the lower incisor to point A by Downs-pogonion line (-1 to APo) and inclination of the lower incisor to mandibular line (-1 to ML), position of the upper incisor to nasion-pogonion line (+1 to NPo), inclination of the upper incisor to nasion-sella line (+1 to NS) and the size of the inter-incisival angle between upper and central lower incisor (-1 to +1). RESULTS: In 58 % of cases, the difference in post-treatment and pre-treatment changes in the position of the (-1 to Apo) was within ± 2 mm, which we considered stable. Statistically signifi cantly higher values after treatment were in unstable rather than in stable cases with values (-1 to Apo), (-1 to ML), (+1 to NPo). Statistically signifi cantly lower value after the treatment was measured in unstable cases rather than in stable cases with a value (-1 to +1). There was no statistically signifi cantly different value in stable and unstable cases after treatment in values (+1 to NS). CONCLUSION: The number of stable post-treatment cases was only 16 % higher than the number of unstable cases. With the increasing value (-1 to Apo), the value (-1 to ML) and (+1 to NPo) increased, the value (+1 to -1) decreased. The value (-1 to NS) not after treatment was not statistically signifi cantly different in stable and unstable cases (Tab. 6, Fig. 4, Ref. 27). Text in PDF www.elis.sk.

Improving lip aesthetics in the face profile after treatment of class II, division 2 malocclusion

“…Treatment of Class II, division 2 malocclusion depends on the age of the patient. The treatment aims at achieving a functional and aesthetically satisfactory result with a guarantee of long-term stability (13). However, such a result can only be achieved after a detailed treatment plan is drawn up and agreed to by the patient.…”

“…It includes sagittal expansion in the upper dental arch and improvement of the torsion of incisors. The need to perform the sagittal expansion in the lower dental arch, even at the expense of stability, is often associated with the effort to achieve facial aesthetics and optimal occlusal outcome (13). However, long-term therapeutic retention of the result is necessary.…”

Determination of individual teleroentgenographic characteristics of the lower medial incisors position in Ukrainian young men and young women with orthognathic bite

“…Vologina data in 20% of cases [17]. Investigation of А. Koniarova et al [18] indicate that the number of stable cases is only 16% higher than the number of relapses with which the statistically proven connections of some indices of the incisors positions.…”