View clinical trials related to Class II Div 1 Malocclusion.
Filter by:Rationale: Class II Division 1 malocclusion is characterized by upper anterior teeth protrusion resulting in upper lip protrusion and convex facial profile, which are considered esthetically unfavorable. Treatment of class II malocclusion due to maxillary protrusion can be done with bilateral maxillary first premolar extraction followed by en-masse retraction of upper anterior teeth using mini implants placed between maxillary 2nd premolar & 1st molar. Treatment of class II malocclusion due to maxillary protrusion without premolar extraction frequently requires distalization of maxillary molars into Class I molar relation by means of extra-oral or intraoral forces. Absolute skeletal anchorage, available 24 hours a day is an alternative method for molar distalization. Zygomatic miniplates fixed at a distance from the root apices, allows distalization of entire dentition as there is no interference between the fixation device and roots of the teeth. Aims and Objectives: To quantify root resorption seen with bilateral extraction of maxillary first premolars (followed by en - masse retraction of anterior teeth) vs full arch distalization with zygomatic miniplates in Class II Division I malocclusion. Method of study: Patients will be allocated randomly to 2 groups-G1 and G2. Patients in G1 will undergo bilateral maxillary 1st premolar extraction before bonding followed by leveling & alignment. Maxillary arch will be stabilized with the help of 0.019"×0.025" stainless steel wire. Hooks will be soldered on archwire used for stabilizing dentition. Mini implants will be placed under local anaesthesia between maxillary 2nd premolar & 1st molar. Ni-Ti closed coil spring will be used to apply a force for en masse retraction of maxillary anterior teeth . In G2, treatment will be initiated by bonding 0.022" slot MBT preadjusted edgewise appliance. Maxillary arch will be stabilized with the help of 0.019"×0.025" stainless steel wire. Zygomatic miniplates will be placed bilaterally. Hooks will be soldered on archwire used for stabilizing dentition. Ni-Ti closed coil spring will be used to apply a force .
23 female participants with class II div I will have extraction of bilateral first bicuspids 10 weeks after bond- up appointment. The extracted teeth will be preserved in special containers for subsequent microscopic analysis. Four months later, upon space closure phase, the patient will have a piezocision surgery on one side randomly chosen. Virtual models will be generated once before the surgery and monthly after for four and a half months. The models will be scanned by CADCAM and later tooth movement will be analyzed in regards to the rugae area.
This study aims to evaluate and compare the skeletal, dental and soft tissue changes, the levels of pain and discomfort and the effect on periodontal health and teeth vitality associated to traditional corticotomy and flapless corticotomy in the retraction of upper anterior teeth. 40 patients requiring extraction of maxillary first premolars and maximum anchorage to retract the upper anterior teeth will participate in the study. They will be divided randomly into two groups : flapless corticotomy (20 patients) and traditional corticotomy (20 patients). Pre-retraction, corticotomy will be performed in the maxillary anterior segment. The skeletal, dental and soft tissue changes will be performed using lateral cephalometric radiographs which will be obtained pretreatment, pre and post en-masse retraction of the anterior teeth and we will also use the dental casts to evaluate the dental changes.