Abstract
<title>Abstract</title> <p>The biomechanical characteristics of maxillary molar distalization appliances play a critical role in determining the efficiency, predictability, and quality of orthodontic tooth movement. In this study, the aim is to investigate the biomechanical effect of a novel palatal TAD-supported distalizer using the Finite Elements Analysis. Two models of maxillary molar distalization appliances were designed based on CBCT images. In the first appliance, 2.94 N distalization force was exerted to the first molar alone, while in the second appliance, equal forces (1.47 N) were applied to the first and second molars. The stress distribution in PDL and three-dimensional displacements of both molars were analyzed. The first appliance resulted in higher compressive stress distribution in the first molar in comparison to the second molar, while the second appliance caused an almost equal stress distribution on both molars. Appliance II caused larger distal displacement of both molars in comparison with Appliance I. First molar moved bodily distally in the first appliance while second molar showed tipping movement. Distribution of distalization force directly to the first and second molars causes a more uniform stress distribution, larger distal displacements, and a movement pattern more like bodily distalization rather than applying distalization force to the first molar alone. Also, Appliance II showed better vertical control, which suggests biomechanical advantages for simultaneous maxillary molar distalization.</p>