EVALUATION OF MANDIBULAR MINI IMPLANTS IN CONJUNCTION WITH CLASS II ELASTICS TO PREVENT THE PROCLINATION OF LOWER INCISORS A RANDOMIZED CONTROL TRIAL
Mabrouk, Mohamed Ali ; author
El-Mangoury, Nagwa Helmy ; supervisor
El Dakroury, Amr Emad ; supervisor
El Dawlatly, Mostafa M. ; supervisor
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• Introduction: Flaring of lower incisors and other undesirable consequences results from the use of class II elastics during orthodontic treatment. The purpose of this study was to attempt to limit the adverse effects of class II elastics by the use of mini implants as anchorage in adolescent females versus a comparison group treated by regular class II elastics without mini-implants. Methods: The sample consisted of 28 patients, (mean age, 15.66 ±2 years) with ¼ or 1/2 unit class II canine relationship. The sample was divided into two groups. Randomization was carried out by a computer sequence generator with 1:1 allocation ratio. The comparison group involved the use of regular class II elastics. While the intervention group involved the use of Class II elastics in conjunction with mini implants inserted between lower second premolar and first molar. Both groups used the class II elastics for 8 months. The amount of lower incisors proclination was assessed by measurements from pre- and post-treatment lateral cephalometric radiographs. Results: No statistical significance in the L1 inclination (0.97±0.92) and L1 AP position (0.31±0.63) but Statistical significance was found in the U1 inclination (5.23±1.92) and U1 AP position (4.05±1.4) [P˂0.001]and [P˂0.05] respectively in the intervention group. Conclusion: Mini-implants placed in the mandibular interradicular bone in conjunction with class II elastics had no anteroposterior skeletal effect, mainly dentoalveolar. Skeletal anchorage didn’t prevent the proclination of lower incisors. The addition of skeletal anchorage didn’t prevent the adverse effects of the vertical component of force of Class II elastics .