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Computational Modeling for Prediction of Acoustic Changes in Vowel Production Due to Orthognathic Surgery (PUMA)

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified June 2013 by Turku University Hospital.
Recruitment status was:  Recruiting
Information provided by (Responsible Party):
Turku University Hospital Identifier:
First received: March 28, 2013
Last updated: June 24, 2013
Last verified: June 2013
A computational model of human sound production based on high quality anatomic measurements and physical laws of sound propagation cannot be accomplished without a comprehensive data set including both 3D-images of the speaker's anatomy and the simultaneous recording of speech. Since the computational model has separate models for the vocal folds and the vocal tract, patients undergoing an orthognathic surgery is an optimal test object for the model development. Vocal folds remain unchanged while substantial changes take place in the vocal tract. Moreover, since the aim of the research is to predict acoustic changes in speech due to operations in head neck area, the orthognathic patient group is par excellence an example of such a prediction problem. If the model can be shown to give valuable information pre-operationally, many other patient groups could benefit from the results.

Condition Intervention
Jaw Deformity Facial Asymmetry Other: MRI examination

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: None (Open Label)
Official Title: Computational Modeling for Prediction of Acoustic Changes in Vowel Production

Further study details as provided by Turku University Hospital:

Primary Outcome Measures:
  • Acoustic changes in vowel production of hte patients duoe to orthognathic surgery [ Time Frame: 6 and 30 weeks postoperatively ]
    a measurement of sound formants

Secondary Outcome Measures:
  • Anatomical changes in vocal tract due to orthognathic surgery [ Time Frame: 6 and 30 weeks postoperatively ]
    changes in vocal track dimensions

Estimated Enrollment: 20
Study Start Date: March 2012
Estimated Study Completion Date: December 2014
Estimated Primary Completion Date: December 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Computational modeling Other: MRI examination
The vocal and nasal tracts from the lips and nostrils to the beginning of the trachea are imaged with Siemens Avanto 1.5T MRI machine using carefully optimized, externally triggered imaging sequences that are synchronized with the rest of the experimental setting. A sound sample, given by the test subject, is recorded simultaneously to obtain a coupled data set: the speech sound and the precise anatomy which produces it.
Other Name: with Siemens Avanto 1.5T MRI machine

Detailed Description:
Orthognathic surgery deals with the correction of abnormalities of the facial tissues. The underlying cause for abnormality may be present at birth or acquired during the life as the result of distorted growth or trauma. Orthodontic treatment alone is not adequate in many cases due to severity of the deformities. In a typical operation, the position of either one jaw (mandible or maxilla) or both jaws is surgically changed in relation to the skull base. The movement of the jaw position varies usually between 5-15 mm either to anterior or posterior direction. Such a considerable movement has a very profound effect on the shape and volume of vocal tract resulting detectable changes in acoustics. Although the surgery involves mandibular and maxillary bone, changes occur also in the position and shape of respective soft tissues and hyoid bone, as well. For this project, 20 adult patients (10 women and 10 men) undergoing orthognathic surgery will be enrolled. Exclusion criteria include diseases and conditions in which MRI examination is contraindicated (.e.g. pace maker), severe speech or hearing impairment, and other situations where the patient has difficulties with completing the tasks defined in the research protocol. Furthermore, patients to whom segmental surgery of the jaws will be performed in connection of orthognathic surgery are excluded. A specific pre-selection criterion for patients is the presence of numerous dental amalgam fillings that may cause artifacts in MR images.

Ages Eligible for Study:   18 Years to 50 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

- Healthy patients undergoing orthognathic surgery

Exclusion Criteria:

  • Patients with conditions in which MRI examination is contraindicated (e.g. pace maker)
  • Patients who require several operations or segmented jaw surgery
  • Patients with cognitive impairment
  • Patients with numerous dental amalgam fillings that may cause artifacts in MR images
  Contacts and Locations
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Please refer to this study by its identifier: NCT01887977

Turku University Hospital Recruiting
Turku, Finland, F!-20521 Turku
Contact: Risto P Happonen, Professor    +358-50-4121477   
Sponsors and Collaborators
Turku University Hospital
Principal Investigator: Risto P Happonen, Professor Turku University Hospital, Po. Box 52, FI-20521 Turku, Finland
  More Information

Responsible Party: Turku University Hospital Identifier: NCT01887977     History of Changes
Other Study ID Numbers: T17/2012
Study First Received: March 28, 2013
Last Updated: June 24, 2013

Keywords provided by Turku University Hospital:
Orthognathic surgery
Speech production

Additional relevant MeSH terms:
Facial Asymmetry
Jaw Abnormalities
Pathological Conditions, Anatomical
Jaw Diseases
Musculoskeletal Diseases
Maxillofacial Abnormalities
Craniofacial Abnormalities
Musculoskeletal Abnormalities
Stomatognathic Diseases
Stomatognathic System Abnormalities
Congenital Abnormalities processed this record on September 21, 2017