Dental and skeletal components of Class II open bite treatment with a modified Thurow appliance. Academic Article uri icon

abstract

  • INTRODUCTION: Due to the lack of studies that distinguish between dentoalveolar and basal changes caused by the Thurow appliance, this clinical study, carried out by the School of Dentistry--State University of São Paulo/Araraquara, aimed at assessing the dental and skeletal changes induced by modified Thurow appliance. METHODS: The sample included an experimental group comprising 13 subjects aged between 7 and 10 years old, with Class II malocclusion and anterior open bite, and a control group comprising 22 subjects similar in age, sex and mandibular plane angle. Maxillary/mandibular, horizontal/vertical, dental/skeletal movements (ANS, PNS, U1, U6, Co, Go, Pog, L1, L6) were assessed, based on 14 landmarks, 8 angles (S-N-ANS, SNA, PPA, S-N-Pog, SNB, MPA, PP/MPA, ANB) and 3 linear measures (N-Me, ANS-Me, S-Go). RESULTS: Treatment caused significantly greater angle decrease between the palatal and the mandibular plane on the experimental group, primarily due to an increase in the palatal plane angle. ANB, SNA and S-N-ANS angles significantly decreased more in patients from the experimental group. PNS was superiorly remodeled. Lower face height (ANS-Me) decreased in the experimental group and increased in the control group. CONCLUSIONS: The modified Thurow appliance controlled vertical and horizontal displacements of the maxilla, rotated the maxilla and improved open bite malocclusion, decreasing lower facial height.

author list (cited authors)

  • Jacob, H. B., dos Santos-Pinto, A., & Buschang, P. H.

citation count

  • 2

publication date

  • January 1, 2014 11:11 AM

keywords

  • Alveolar Process
  • Anatomic Landmarks
  • Angle Class Ii Malocclusion
  • Case-Control Studies
  • Cephalometry
  • Child
  • Chin
  • Extraoral Traction Appliances
  • Female
  • Follow-Up Studies
  • Humans
  • Incisor
  • Male
  • Malocclusion, Angle Class Ii
  • Mandible
  • Mandibular Condyle
  • Maxilla
  • Molar
  • Nasal Bone
  • Open Bite
  • Orthodontic Appliance Design
  • Orthopedics
  • Palatal Expansion Technique
  • Palate
  • Retrospective Studies
  • Rotation
  • Sella Turcica
  • Tooth Movement Techniques
  • Vertical Dimension