Crossbite is one of the most common and complex pathologies in orthodontics, with a prevalence of approximately 8-22% in the population, adversely affecting masticatory function, facial aesthetics, temporomandibular joint function, and patients' overall quality of life. Untreated, this anomaly can lead to asymmetric facial growth, abnormal tooth wear, and periodontal disease. Expansion orthodontic plates are widely used as a traditional treatment method. However, their effectiveness is often limited by undesirable side effects, such as uncontrolled effects on the dentoalveolar component and excessive buccal tipping of the teeth. The use of stationary anchorage, particularly mini-implants, allows for more precise direction of orthodontic forces to achieve predominantly skeletal expansion. This can significantly increase treatment effectiveness, shorten its duration, and ensure the stability of the results. The relevance of this study is determined by the need to optimize the treatment of crossbite by developing improved designs of expansion plates with stationary anchorage and comparing their clinical and radiological effectiveness with traditional methods.

crossbite, maxillary constriction, orthodontic treatment, expansion plates, stationary anchorage, mini-implants, skeletal expansion, dentoalveolar expansion, treatment efficiency.

Carlson, C., Sung, J., McComb, R. W., Machado, A. W., & Moon, W. (2016). Micro-implant-assisted rapid palatal expansion appliance toorthopedically correct transverse maxillary deficiency in an adult. American Journal of Orthodontics and Dentofacial Orthopedics, 149(5), 716–728. https://doi.org/10.1016/j.ajodo.2015.05.025

Garib, D. G., Henriques, J. F. C., Janson, G., Freitas, M. R. D., & Coelho, R. A. (2005). Rapid maxillary expansion—tooth-tissue-borne versus tooth-borne expanders: A CBCT evaluation of dentoskeletal effects. The Angle Orthodontist, 75(4), 548–557. https://doi.org/10.1043/0003-3219(2005)75[548:RMETTV]2.0.CO;2

Haas, A. J. (2004). The Haas-type palatal expander: A 40-year perspective. In Seminars in Orthodontics (Vol. 10, No. 3, pp. 149-167). WB Saunders. https://doi.org/10.1053/j.sodo.2004.04.001

Kanomi, R. (1997). Mini-implant for orthodontic anchorage. Journal of clinical orthodontics: JCO, 31(11), 763–767.

Lee, K. J., Park, Y. C., Park, J. Y., & Hwang, C. J. (2010). Miniscrew-assisted nonsurgical palatal expansion before orthognathic surgery for a patient with severe mandibular prognathism. American Journal of Orthodontics and Dentofacial Orthopedics, 137(6), 830–839. https://doi.org/10.1016/j.ajodo.2007.10.057

Liu, S., Xu, T., & Zou, W. (2018). Effects of maxillary protraction with alternating rapid palatal expansion and constriction vs expansion alone in Class III patients: A single-center, randomized controlled trial. American Journal of Orthodontics and Dentofacial Orthopedics, 153(5), 639-648. https://doi.org/10.1016/j.ajodo.2017.09.014

Proffit, W. R., Fields, H. W., & Sarver, D. M. (2018). Contemporary orthodontics (6th ed.). Elsevier.

Sandikcioglu, M., & Hazar, S. (1997). Skeletal and dental changes after maxillary expansion in the mixed dentition. American Journal of Orthodontics and Dentofacial Orthopedics, 111(3), 321–327. https://doi.org/10.1016/s0889-5406(97)70188-1

Wilmes, B., Nienkemper, M., & Drescher, D. (2011). Application and effectiveness of a mini-implant- and tooth-borne rapid palatal expansion device: the hybrid hyrax. The World Journal of Orthodontics, 12(4), 323-330.