A Modified Hyrax-Type Expander Is Effective for Distal Bodily Movement of the Maxillary First Molar

Impaction and eruption disturbance of permanent teeth are frequently encountered in orthodontic practice. The canine teeth play an important role both functionally and esthetically. Eruption disturbance of a maxillary canine, if left untreated, can cause not only disturbed jaw movement and esthetic problems, but also root resorption of adjacent permanent teeth, and thus should be diagnosed and treated appropriately. In this report, we present a case of a patient with eruption disturbance of the maxillary left canine in which the maxillary left second molar was extracted and the maxillary left first molar was distally moved with a Hyrax-type expander (Veltri Monolateral Screw®; Leone, Firenze, Italy) designed to enable the distal movement of a unilateral first molar in order to create eruption space for the maxillary left canine, resulting in smooth distal molar movement and alignment of the left maxillary canine in the dental arch. Furthermore, the maxillary third molar was also aligned to achieve a good occlusal relationship without reducing the number of teeth.

[1]  L. Arriola-Guillén,et al.  Influence of impacted maxillary canine orthodontic traction complexity on root resorption of incisors: A retrospective longitudinal study , 2019, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[2]  Shannon Hilgers Nissen.  The Pendulum Appliance for Class II Non-Compliance Therapy. , 2017, Journal of clinical orthodontics : JCO.

[3]  H. Jacob,et al.  Evaluation of the rapid and slow maxillary expansion using cone-beam computed tomography: a randomized clinical trial , 2017, Dental press journal of orthodontics.

[4]  A. Becker,et al.  Etiology of maxillary canine impaction: a review. , 2015, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[5]  G. L. Ribeiro,et al.  Three-dimensional assessment of buccal alveolar bone after rapid and slow maxillary expansion: a clinical trial study. , 2013, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[6]  Sampath Anche,et al.  Impacted canines: Etiology, diagnosis, and orthodontic management , 2012, Journal of pharmacy & bioallied sciences.

[7]  H. Oktay,et al.  Investigation of transmigrated and impacted maxillary and mandibular canine teeth in an orthodontic patient population. , 2010, Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons.

[8]  G. Janson,et al.  Strategic maxillary second-molar extraction in Class II malocclusion. , 2009, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[9]  A. Aras.  Class II correction with the modified sagittal appliance and maxillary second molar extraction. , 2009, Angle Orthodontist.

[10]  G. Janson,et al.  Comparative distalization effects of Jones jig and pendulum appliances. , 2009, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[11]  G. Janson,et al.  Sagittal, vertical, and transverse changes consequent to maxillary molar distalization with the pendulum appliance. , 2006, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[12]  E. Valmaseda-Castellón,et al.  Spontaneous third-molar eruption after second-molar extraction in orthodontic patients. , 2006, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[13]  Peter Ngan,et al.  Early Timely Management of Ectopically Erupting Maxillary Canines , 2005 .

[14]  E. F. Harris,et al.  Cephalometric comparison of maxillary second molar extraction and nonextraction treatments in patients with Class II malocclusions. , 2001, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[15]  J. Kurol,et al.  Eruption disturbances of maxillary permanent canines in Japanese children , 2001 .

[16]  H. Orton,et al.  Eruption of third permanent molars after the extraction of second permanent molars. Part 1: Assessment of third molar position and size. , 2001, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[17]  T. Noda,et al.  The palatally displaced canine in Japanese children , 2000 .

[18]  Noda Tadashi.  Treatment Guidance for Eruption Disturbance , 2000 .

[19]  J. McNamara,et al.  Dentoalveolar and skeletal changes associated with the pendulum appliance. , 2000, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[20]  T. Graber.  Orthodontic Treatment of Impacted Teeth , 1998 .

[21]  S E Bishara,et al.  Impacted maxillary canines: a review. , 1992, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[22]  J Kurol,et al.  Radiographic examination of ectopically erupting maxillary canines. , 1987, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[23]  H Jacoby,et al.  The etiology of maxillary canine impactions. , 1983, American journal of orthodontics.

[24]  Nikhilesh R Vaid,et al.  Comparison of Treatment Effects with Modified C-Palatal Plates vs Greenfield Molar Distalizer Appliances in Adolescents. , 2020, Journal of Clinical Pediatric Dentistry.

[25]  S. Hayashi-Sakai,et al.  Eruption disturbances in Japanese children and adolescents , 2006 .

[26]  K. Sayınsu,et al.  A new approach in maxillary molar distalization: intraoral bodily molar distalizer. , 2000, American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics.

[27]  M. Darendeliler,et al.  Distal molar movement using the pendulum appliance. Part 1: Clinical and radiological evaluation. , 1997, The Angle orthodontist.

[28]  G. Komposch,et al.  Extraction of maxillary second molars in the treatment of Class II malocclusion. , 1996, The Angle orthodontist.

[29]  W. Magness.  Extraction of second molars. , 1986, Journal of clinical orthodontics : JCO.

[30]  A. D. Hitchin.  The impacted maxillary canine. , 1951, The Dental practitioner and dental record.