Facial Patterns and Masticatory Symmetries

This study has been completed.
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Information provided by:
University of Campinas, Brazil
ClinicalTrials.gov Identifier:
First received: January 24, 2011
Last updated: January 28, 2011
Last verified: January 2011
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


Study Type: Observational
Study Design: Time Perspective: Cross-Sectional
Official Title: Preferred Chewing Side, Symmetry of Bite Force and Occlusal Contact Area of Subjects With Different Craniofacial Vertical Dimensions

Further study details as provided by University of Campinas, Brazil:

Primary Outcome Measures:
  • Masticatory movements during mastication [ Time Frame: 2 hours ] [ Designated as safety issue: Yes ]
    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:
  • Bite force and occlusal contact area [ Time Frame: 2 hours ] [ Designated as safety issue: Yes ]

    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.

Enrollment: 86
Study Start Date: September 2006
Study Completion Date: December 2008
Primary Completion Date: June 2007 (Final data collection date for primary outcome measure)
Subjects with a horizontal facial growth pattern
Subjects with a balanced facial growth pattern
Subjects with a vertical facial growth pattern

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.


Ages Eligible for Study:   18 Years to 32 Years
Genders Eligible for Study:   Both
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
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Please refer to this study by its ClinicalTrials.gov identifier: 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
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: Renata Cunha Matheus Rodrigues Garcia, Piracicaba Dental Schoo, State University of Campinas
ClinicalTrials.gov Identifier: NCT01286363     History of Changes
Other Study ID Numbers: monegfg11 
Study First Received: January 24, 2011
Last Updated: January 28, 2011
Health Authority: Brazil: National Committee of Ethics in Research

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

ClinicalTrials.gov processed this record on May 26, 2016