Facial Patterns and Masticatory Symmetries

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01286363
Recruitment Status : Completed
First Posted : January 31, 2011
Last Update Posted : January 31, 2011
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Information provided by:
University of Campinas, Brazil

Brief Summary:
The purpose of this study is to evaluate chewing side preference, and lateral asymmetry of occlusal contact area and bite force of individuals with different craniofacial patterns

Condition or disease

Detailed Description:

Dolichofacial subjects presents poorer mechanical advantage, less efficiency in masticatory muscles during mastication and in generating bite force, smaller occlusal contact area and masticatory capacity when compared to brachyfacial individuals.

Wide, bilateral chewing cycles were related to better masticatory performance, however, unilateral chewing was reported to be very common in population, and it has been associated to lateral asymmetry on bite force and occlusal contact area.

It has been reported that dolichofacial subjects need greater muscular effort during mastication when compared to meso and brachyfacial subjects. This may cause functional overloading of weaker masticatory muscles, and may lead to functional asymmetries.

Study Type : Observational
Actual Enrollment : 86 participants
Time Perspective: Cross-Sectional
Official Title: Preferred Chewing Side, Symmetry of Bite Force and Occlusal Contact Area of Subjects With Different Craniofacial Vertical Dimensions
Study Start Date : September 2006
Actual Primary Completion Date : June 2007
Actual Study Completion Date : December 2008

Subjects with a horizontal facial growth pattern
Subjects with a balanced facial growth pattern
Subjects with a vertical facial growth pattern

Primary Outcome Measures :
  1. Masticatory movements during mastication [ Time Frame: 2 hours ]
    A jaw tracking device was positioned on subjects face, who were asked to chew an artificial material in their habitual way. Tracings of jaw lateral movements during mastication were analyzed to classify in which side each chewing stroke was taken. If 80 percent or more chewing cycles were classified as left or right, the subjects were considered as unilateral chewer.

Secondary Outcome Measures :
  1. Bite force and occlusal contact area [ Time Frame: 2 hours ]

    A strain gauge was positioned on subject's first molar region unilaterally to measure the symmetry of bite force. The individual was asked to bite as hard as possible. The procedure was repeated to the other side, and the bite symmetry of sides was analyzed.

    To evaluate symmetry of occlusal contact area, a registration of posterior teeth was performed with the subjects in maximal intercuspal position. The registration was digitalized, discolored, color inverted and adjusted for size to evaluate thickness of registration material using a software.

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Ages Eligible for Study:   18 Years to 32 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Students and staff of Piracicaba Dental School, and individuals seeking for dental treatment at the same institution

Inclusion Criteria:

  • Full dentition, good general and oral health

Exclusion Criteria:

  • Facial deformities
  • Severe malocclusion
  • History of signs and symptoms of temporomandibular disorder
  • History of parafunctions
  • History of maxillofacial surgery or jaw injuries and orthodontic treatment concluded in the last 2 years

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01286363

Piracicaba Dental School
Piracicaba, São Paulo, Brazil, 13414-903
Sponsors and Collaborators
University of Campinas, Brazil
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Principal Investigator: Simone G Farias Gomes, PhD Universidade Federal de Pernambuco
Study Chair: William Custodio, MS Piracicaba Denal School, State University of Campinas
Study Chair: Fernanda Faot, PhD Federal University of Pelotas
Study Director: Altair A Del Bel Cury, PhD Piracicaba Dental School, State University of Campinas
Study Director: Renata CM Rodrigues Garcia, PhD Piracicaba Dental School, State University of Campinas

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Renata Cunha Matheus Rodrigues Garcia, Piracicaba Dental Schoo, State University of Campinas Identifier: NCT01286363     History of Changes
Other Study ID Numbers: monegfg11
First Posted: January 31, 2011    Key Record Dates
Last Update Posted: January 31, 2011
Last Verified: January 2011

Keywords provided by University of Campinas, Brazil:
Bite force
Dental occlusion