The use of miniscrew-anchored inverted FRD could effectively increase maxillary forward growth, but it did not prevent mesial movement of the maxillary dentition. Significant lower incisor retroclination was observed. Significant esthetic improvement of the facial profile was achieved primarily because of lower lip retrusion and upper lip protrusion.

Purpose: Evaluation of the changes of the segmented 3D model of the pharyngeal airway volume and surface area after using conventional and hybrid Hyrax (with micro implant) for maxillary expansion using MIMICS software. Materials and methods:Sample size: 20 male patients with constricted maxilla dedicated for maxillary expansion as a part of orthodontic treatment plan. For each patient, written acceptance consent was taken to participate in the study. Selection criteria: -Age 12-14 years. -Absence of any: previous orthodontic intervention, breathing disorder, deformities that may affects the craniofacial structures. -Constricted maxilla indicated for Hyrax Rapid Palatal Expansion (RPX). The sample was divided into two groups: The first group (10 patients) was treated with conventional Hyrax appliance supported on first permanent molars bilaterally (dental anchorage). The second group (10 patients) treated with hybrid Hyrax supported on first permanent molar and first premolar bilaterally, this appliance incorporating two eyelets for additional skeletal anchorage with two micro-implants. For each patient enrolled in this study a full skull CT x ray was done just before the insertion of the Hyrax appliance and after 10 days of rapid palatal expansion at a constant rate for all patients. The full skull CT was processed via MIMICS software for segmentation, 3D modeling and measurements of the pharyngeal airway volume and surface area from the level of the hard palate to the lower border of the hyoid bone.Results: -For both conventional and Hybrid Hyrax, Rapid Palatal Expansion resulted in statistically significant increase in the pharyngeal airway volume and surface area (1.87cm 3 , 2.52cm 3 , 1,68cm 2 and 2.48cm 2 ) respectively. -Greater increase in the pharyngeal airway volume and surface area in the second group due to incorporation of the micro-implants but the statistical differences between both groups was found to be non-significant.Conclusions Both conventional and hybrid Hyrax produced significant increase in pharyngeal airway volume and surface area, this effect can be augmented by incorporating skeletal support (micro implant) in the Hyrax appliance.

No abstract

Aim: This study was designed to compare the effects of tea tree oil and chlorhexidine mouth rinse in the treatment of gingivitis induced by orthodontic treatment. Materials and Methods: Sixty patients undergoing orthodontic treatment and suffering from gingivitis were included and divided randomly into three groups, group I (20 patients): Patients received scaling and oral hygiene instructions, group II (20 patients): Patients received scaling, oral hygiene instructions and chlorhexidine mouth rinse and group III (20 patients): Patients received scaling, oral hygiene instructions and tea tree oil mouth rinse. Results:The results of this study revealed that all treatment modalities achieved a statistically significant reduction of the mean plaque index, gingival index and papillary bleeding index throughout the six months evaluation period as compared to the mean base-line values (P<0.001). This 6-month controlled clinical study demonstrated that the tea tree oil mouth rinse had comparable anti-gingivitis activity with chlorhexidine mouth rinse which is known to produce significantly higher levels of extrinsic stain. Conclusion:Due to side effects associated with the chlorhexidine mouth rinse, it is suggested that tea tree oil mouth rinse can be used instead, as it proved to have a distinct role in the management of gingivitis induced by orthodontic treatment.

No abstract