title: Does hyoid bone resection according to Sistrunk influence normal craniofacial growth? A cephalometric study.
abstract: OBJECTIVE
  To retrospectively evaluate the influence of hyoid bone resection according to Sistrunk in early age due to a thyroglossal duct cyst on craniofacial growth.
  
  
  METHODS
  We retrospectively examined 10 patients (2 females and 8 males) having had hyoid bone resection according to Sistrunk due to thyroglossal duct cysts by lateral cephalograms taken before orthodontic treatment (mean, 17.1 years; range, 8.6-31.9 years). Surgery was carried out at a mean age of 4.4 years (range, 0.37-9.8 years). All lateral cephalograms were evaluated and traced by hand. Descriptive statistics were calculated, and data from each patient were compared individually with corresponding standard values (age and gender) from Bathia and Leighton.
  
  
  RESULTS
  With regard to sagittal parameters, the SNB angles were by trend too small and the ANB angles were too large. However, the ratio of mandibular to maxillary length showed that the patients had a mandible that was too large or maxilla that was too small. With regard to vertical parameters, large deviations from normal values in both directions (hyperdivergent to hypodivergent pattern) could be detected when we analyzed NSL/ML', NL/ML', and NSL/NL. With regard to dental parameters, the majority of the patients had retroclined upper (IsL/NL, IsL/N-A) and lower (IiL/ML, IiL/N-B) incisors.
  
  
  CONCLUSIONS
  Several vertical and horizontal skeletal and dental cephalometric parameters were shown to be different by trend when compared with control values. A possible negative impact on craniofacial growth potential and direction as a result of hyoid resection in early age according to Sistrunk cannot be excluded.
authors.affiliation: Member of Senior Staff, Department of Orthodontics and Dentofacial Orthopedics, University of Berne, Berne, Switzerland. isabella.vassalli@zmk.unibe.ch
authors.forename: Isabella M
authors.initials: IM
authors.lastname: Joss-Vassalli
authors.forename: Christof U
authors.initials: CU
authors.lastname: Joss
authors.forename: Urs
authors.initials: U
authors.lastname: Gebauer
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002508:Cephalometry / Q000379:methods*; D002648:Child; D002680:Chin / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006928:Hyoid Bone / Q000601:surgery*; D007180:Incisor / Q000473:pathology; D008297:Male; D008334:Mandible / Q000254:growth & development / Q000473:pathology; D008437:Maxilla / Q000254:growth & development / Q000473:pathology; D008445:Maxillofacial Development / Q000502:physiology*; D009295:Nasal Bone / Q000473:pathology; D012189:Retrospective Studies; D012658:Sella Turcica / Q000473:pathology; D013955:Thyroglossal Cyst / Q000601:surgery; D014716:Vertical Dimension; D055815:Young Adult