Orthodontic Journal of Nepal, Vol. 10 No. 1, January-June 2020 44 INTRODUCTION Maxillary arch distalization is an increasingly popular option to correct the class II malocclusion with non- extraction approach. Headgear has been conventional modality for class II malocclusion through distalization of molars or entire the maxillary dentition. However, its main disadvantage is patient compliance. To avoid this drawback, various non-compliance appliances have been developed including Keles slider, repelling magnets, distal jet, and pendulum. These devices applied continuous forces to distalize maxillary arch, which might lead to distal tipping and extrusion of the frst molars and mesial reactive forces might cause anchorage loss and labial faring of anterior teeth. 1 To overcome unwanted side-effects, recent technique Dr Sneha Sanap, 1 Dr Vinit Swami, 2 Dr Amol Patil, 3 Dr Shailesh Deshmukh, 4 Dr Veera Bhosale 5 1 Post-Graduate Student, 2-4 Professor, 5 Professor & Head Department of Orthodontics, Bharati Vidyapeeth Deemed to be University Dental College and Hospital, Pune, India. Correspondence: Dr Sneha Sanap; Email: sneha.sanap7@gmail.com Evaluation of Efficacy of Various Implants in Maxillary Arch Distalization - A Finite Element Analysis ABSTRACT Introduction: Orthodontic correction of Angle’s class II molar relation has, for long, been one of the challenge in orthodontics, with various researchers attempting to correct the class II molar relationship by diverse methods. One of the technique that has gained popularity in recent times is maxillary arch distalization by infrazygomatic screws and miniscrews. The objective of the study is to measure and compare the amount of maxillary arch distalization and its effects, on adjacent teeth, by varying the positions of mini-implants by Finite Element Analysis. Materials & Method: A standard three-dimensional fnite element model was constructed to simulate the maxillary teeth, periodontal ligament, and alveolar process. In this study, three models were prepared. Model-1: The (miniscrews) were placed between upper frst and second premolar, and between second premolar and frst molar bilaterally. Model-2: Infrazygomatic screws was placed between upper frst and second molar bilaterally. Model-3: Infrazygomatic screws was placed on the mesio- buccal root of upper frst molar bilaterally. The displacement of each tooth was calculated on x, y, and z axes when 200 gm of force was applied on each side. Result: Maximum amount of maxillary arch distalization was seen when infrazygomatic screws placed between upper frst and second molar in model-2. Whereas maximum amount of maxillary arch intrusion and less distalization was observed when miniscrews placed between upper frst premolar and second premolar and in between second premolar and upper frst molar in model-1. The difference was statistically signifcant (p=0.005*). There was no bucco-palatal rotation of teeth observed among all three fnite element models. Conclusion: Thus infrazygomatic screws and miniscrews are the effective means of maxillary arch distalization for the correction of Class II malocclusion. Keywords: Class II malocclusion; Finite element; Maxillary arch distalization; Miniscrews. Research Article such as maxillary arch distalization by mini-implants are more effective and give good results. Miniscrews were introduced in clinical orthodontics for the purpose of orthodontic anchorage, and these presented the clinician with a versatile option. 2-7 Sugawara et. al. (2006) proposed maxillary dentition distalization by using titanium anchor plates. 8 Miniscrew implants provides absolute anchorage and their ability to retract whole dentitions can eliminate adverse reciprocal movement and maximize the effciency of the treatment. 9 In addition, miniscrews provides the option, for early loading after placement which reduces treatment time. The application of monocortical miniscrew type temporary anchorage devices to various clinical situations demanding movement of either a single