Facial Patterns and Masticatory Symmetries

Facies Clinical Trial

Official title:

Preferred Chewing Side, Symmetry of Bite Force and Occlusal Contact Area of Subjects With Different Craniofacial Vertical Dimensions

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT01286363
• Other study ID #: monegfg11
• Status: Completed
• Phase: N/A
• First received: January 24, 2011
• Last updated: January 28, 2011
• Start date: September 2006
• Est. completion date: December 2008

Study information

• Verified date: January 2011
• Source: University of Campinas, Brazil
• Contact: n/a
• Is FDA regulated: No
• Health authority: Brazil: National Committee of Ethics in Research
• Study type: Observational

Clinical Trial 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

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 86
• Est. completion date: December 2008
• Est. primary completion date: June 2007
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Both
• Age group: 18 Years to 32 Years

Eligibility

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

Study Design

Time Perspective: Cross-Sectional

Related Conditions & MeSH terms

• Facies

Locations

Country	Name	City	State
Brazil	Piracicaba Dental School	Piracicaba	São Paulo

Sponsors (2)

Lead Sponsor	Collaborator
University of Campinas, Brazil	Conselho Nacional de Desenvolvimento Científico e Tecnológico

Country where clinical trial is conducted

Brazil, 

References & Publications (4)

García-Morales P, Buschang PH, Throckmorton GS, English JD. Maximum bite force, muscle efficiency and mechanical advantage in children with vertical growth patterns. Eur J Orthod. 2003 Jun;25(3):265-72. — View Citation

Gomes SG, Custodio W, Faot F, Del Bel Cury AA, Garcia RC. Masticatory features, EMG activity and muscle effort of subjects with different facial patterns. J Oral Rehabil. 2010 Nov;37(11):813-9. doi: 10.1111/j.1365-2842.2010.02075.x. Epub 2010 Aug 19. — View Citation

Martinez-Gomis J, Lujan-Climent M, Palau S, Bizar J, Salsench J, Peraire M. Relationship between chewing side preference and handedness and lateral asymmetry of peripheral factors. Arch Oral Biol. 2009 Feb;54(2):101-7. doi: 10.1016/j.archoralbio.2008.09.006. Epub 2008 Oct 22. — View Citation

Sonnesen L, Bakke M, Solow B. Temporomandibular disorders in relation to craniofacial dimensions, head posture and bite force in children selected for orthodontic treatment. Eur J Orthod. 2001 Apr;23(2):179-92. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Masticatory movements during mastication	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.	2 hours	Yes
Secondary	Bite force and occlusal contact area	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.	2 hours	Yes