Soft tissue changes accompanying treatment of class II DI malocclusion using growth modification appliances

This study was planned to investigate the soft tissues response as a result of treating cases presented with Angl's Class II Division I malocclusion using different myofunctional appliances [Frankel, Herbest and Activators] after a period of one year. The sample consist of 40 subjects with age range 10-12 years. This sample was divided into four equal groups, ten for each treatment group and the last group was kept as a control. The statistical analysis of the collected data revealed that the activator followed by the Herbest showed the most significant improvement as regard retraction of upper lip, soft tissue subnasale and protraction of the soft tissue pogonion. On the other hand, the Herbest followed by the Frankel showed a more forward positioning of the lower lip. As regard the esthetic line the activator followed by the Frankel showed more upper lip retraction to the esthetic line while the Frankel showed the most lower lip protraction relative to that line. Conclusively the activator showed the most observable improvement in the soft tissue convexity in treating Angle's class II Division 1 malocclusion

Anchorage loss and vertical dentofacial components

A cephalometric radiographic study was carried out to measure the possible dentofacial vertical changes that might be caused by mesial movement of anchor molars during canine retraction with maximum intraoral anchorage. The sample composed of 15 preoperative and post-operative lateral cephalometric radiographs and study models for patients having class 11 division 1 malocclulusion and their treatment necessitated premolar extraction and canine retraction. Their ages ranged between 16 to 23 years while the average treatment time to complete canine retraction was 6 months. The results showed significant mesial molar tipping, noticeable but statistically unsignificant anticlock wise rotation of the occlusal plane and increase of the lower anterior facial high as measured by ANS-Me linear measurement and ANS-Xi-Pm angle. Also, negligible increase of the mandibular plane steepness and incisal over bite were observed

Mandibular lip bumper and first permanent molar position

This study was carried out to clarify the possible changes in the mandibular first molar position after six months wearing of mandibular lip bumper. A sample consisted of twenty Egyptian children suffering from class 11 division 1 malocclusion was selected their age ranged from 8 - 10 years representing the mixed dentition stage of development. The sample was divided into two equal groups. One of them received mandibular for six months and the other considered as a control group. It was found that the mandibular first molars in the lip bumper group moved in three plane of space, inward and upward with significant backward tipping as well as mesiolingual rotation. However, no significant changes in the molar position were recorded in the control group