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Masticatory efficiency in class II and class III dentofacial deformities. 2012

M N C Picinato-Pirola, and W Mestriner, and O Freitas, and F V Mello-Filho, and L V V Trawitzki
Department of Ophthalmology, Otorhinolaryngology and Head and Neck Surgery, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Brazil. melissapicinato@yahoo.com.br

Masticatory efficiency may be impaired in individuals with dentofacial deformities. The objective of the present study was to determine the condition of masticatory efficiency in individuals with dentofacial deformities. 30 patients with class II (DG-II) and 35 patients with class III (DG-III) dentofacial deformity participated in the study, all had an indication for orthognathic surgery. 30 volunteers (CG) with no alterations of facial morphology or dental occlusion and with no signs or symptoms of temporomandibular joint dysfunction also participated. Masticatory efficiency was analysed using a bead system (colorimetric method). Each individual chewed 4 beads, one at a time, over 20s measured with a chronometer. The groups were compared in terms of masticatory efficiency using analysis of variance (ANOVA), with the level of significance set at P<0.05. Masticatory efficiency was significantly greater in CG (P<0.05) than in DG-II and DG-III in all chewing tasks tested, with no significant difference between DG-II and DG-III (P>0.05). It was observed that the presence of class II and class III dentofacial deformity affected masticatory efficiency compared to CG, although there was no difference between DG-II and DG-III.

UI MeSH Term Description Entries
D008297 Male Males
D008312 Malocclusion, Angle Class II Malocclusion in which the mandible is posterior to the maxilla as reflected by the relationship of the first permanent molar (distoclusion). Angle Class II,Angle Class II, Division 1,Angle Class II, Division 2,Class II Malocclusion, Division 1,Class II Malocclusion, Division 2,Malocclusion, Angle Class II, Division 1,Malocclusion, Angle Class II, Division 2,Class II, Angle
D008313 Malocclusion, Angle Class III Malocclusion in which the mandible is anterior to the maxilla as reflected by the first relationship of the first permanent molar (mesioclusion). Angle Class III,Habsburg Jaw,Hapsburg Jaw,Prognathism, Mandibular,Underbite
D008409 Mastication The act and process of chewing and grinding food in the mouth. Chewing
D008437 Maxilla One of a pair of irregularly shaped bones that form the upper jaw. A maxillary bone provides tooth sockets for the superior teeth, forms part of the ORBIT, and contains the MAXILLARY SINUS. Maxillae,Maxillary Bone,Bone, Maxillary,Bones, Maxillary,Maxillary Bones,Maxillas
D011378 Prognathism A condition marked by abnormal protrusion of the mandible. (Dorland, 27th ed) Prognathisms
D003124 Colorimetry Any technique by which an unknown color is evaluated in terms of standard colors. The technique may be visual, photoelectric, or indirect by means of spectrophotometry. It is used in chemistry and physics. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
D005260 Female Females
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328 Adult A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available. Adults

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