EVALUATION OF TREATMENT CHANGES IN CLASS II DIVISION 1 MALOCCLUSION DURING EN MASSE RETRACTION OF UPPER ANTERIOR TEETH USING MINI IMPLANTS PLACED AT INFRAZYGOMATIC CREST AND INTERRADICULAR SITES A RANDOMIZED CLINICAL TRIAL.

Condition(s) studied

Investigational drug(s) / intervention(s)

retraction of anterior teeth using mini implants placed at infrazygomatic crest.: undergo bilateral extraction of maxillary first premolars before initial leveling and alignment followed by retraction of anterior teeth using mini implants placed at infrazygomatic crest.

retraction of anterior teeth using mini implants placed at interradicular sites.: bilateral extraction of maxillary first premolars before initial leveling and alignment followed by retraction of anterior teeth using mini implants placed at interradicular sites.

Study summary

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 at infrazygomatic or interradicular sites.

Aims and Objectives: To evaluate the treatment changes achieved in class II division 1 malocclusion during en- masse retraction of upper anterior teeth using mini-implants placed at infrazygomatic crest versus interradicular sites.

To compare patients' and orthodontist's perceptions of treatment being done in both the groups.

Method of study: Treatment will be initiated by bilateral maxillary 1st premolar extraction followed 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 and then randomized allocation of the patients into 2 groups-G1 and G2 will be done. G1 will receive infrazygomatic crest mini-implants bilaterally and G2 will receive bilateral interradicular mini-implants. Hooks will be soldered on archwire used for stabilizing dentition. Ni-Ti closed coil spring will be used to apply force.

Eligibility

Primary outcome measure(s)

• skeletal and dental cephalometric variables — 15 months
  Comparison of pretreatment and post 6 month evaluation of skeletal and dental cephalometric variables between the two groups Skeletal cephalometric variables 1. SNA: SN to NA angle 2. A-NPerp: linear distance from A-point to nasion-perpendicular(a line perpendicular to Frankfort plane, through nasion) 3. SNB: SN to NB angle 4. SND: SN to ND angle 5. LAFH (lower anterior face height): distance from anterior nasal spine to menton. Dental cephalometric variables 1. Mx1.NA: maxillary incisor long axis to NA angle 2. Mx1-NA: distance between the maxillary central incisor edge and the NA line 3. Mx1-VRL: distance from the maxillary central incisor edge to VRL (vertical reference line passing through sella and perpendicular to horizontal line constructed by reducing 7° from SN line) 4. Mx6-VRL: distance from maxillary first molar mesial cusp to VRL 5. Md1.NB: mandibular incisor long axis to NB angle 6. Md1-NB: distance between the mandibular central incisor edge and the NB line.

Trial sites (1)

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