Comparison of the anchorage value of the first molars supported with implant and first molars supported with second molar during en masse retraction

Comparison of the anchorage value of the first molars supported with implant and first molars supported with second molar during en masse retraction: M Kaladhar Naik, Garadappagari Dharmadeep, Yellampalli Muralidhar Reddy, Sreekanth Cherukuri, Kranthi Praveen Raj, Vishnuvardhan Reddy



Journal of International Society of Preventive and Community Dentistry 2020 10(1):9-15



Aims and Objectives: The aim of this study was to determine the efficacy of mini-implants as adjuncts for intraoral anchorage units for en masse retraction of maxillary anterior teeth in bimaxillary dentoalveolar protrusion cases. Materials and Methods: The study sample consisted of 15 patients (10 females and 5 males). The samples were compared for anchorage loss with the implant-supported molar and conventional molar contralaterally in both the maxilla and mandible after six months of retraction period. The mini-implants used were 1.5mm in diameter and 8mm in length and were inserted in the first and third quadrant between the roots of second premolar and first molar under local anesthesia at an angle of 45°. For en masse retraction, active tiebacks with ligating (100g) were used bilaterally extending from molar hooks to J-hook on a 0.019” × 0.025” stainless steel arch wire. Lateral cephalograms were taken before and after retraction for assessing the loss of anchorage in maxillary and mandibular first molars. Results: Anchorage loss of 1.46mm in the maxilla and 1.36mm in mandible was found with conventional molar anchorage, whereas no statistically significant anchorage loss was found in the implant-supported molar side. Conclusion: Implant-supported molar side showed better anchorage compared with the conventional molar side. Hence, implant-supported molar can be used as an absolute anchorage unit in the en masse retraction of anterior teeth.