IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) e-ISSN: 2279-0853, p-ISSN: 2279-0861.Volume 17, Issue 5 Ver. 13(May. 2018), PP 44-46 www.iosrjournals.org DOI: 10.9790/0853-1705134446 www.iosrjournals.org 44 | Page The Influence of Malocclusion on the Speed of Mastication *Vesna Jankulovska1, Evdokija Jankulovska2, Gabriela Kjurchieva- Chuchkova3, Lidija Kanurkova4, Vaska Antevska5, Velevska Milena6, Petar Jankulovski7, Elena Petrova8, Igor Petrov9, Iva Manevska10 1,3,4,8,10 Department of orthodontics, Faculty of dentistry, Skopje, Macedonia 2 Department of prosthodontics, Faculty of dentistry, Skopje, Macedonia 5 Department of physiology, Faculty of medicine, Skopje, Macedonia 9 Department of neurology, Faculty of medicine, Skopje, Macedonia 1,6,7 Private Dental Practice JANKULOVSKI, Skopje, Macedonia Corresponding Author: *Vesna Jankulovska Abstract:Aim: To evaluate the influence of the malocclusion on the functional state of the masticatory system. Material and method: The examinations were conducted at the Institute of Medical and Experimental Physiology, Faculty of Medicine in Skopje. The study included 60 respondents (classified). The masticatory efficiancy is determined by examining the biopotentials of the masseter muscles of the subjects. The mechanical efficacy is determined by the number of chewing cycles and the time of mastication. Walnuts with a precise weight of 2.5 grams were used as a test-food.Results: Results from the control group show that male respondents have a lower chewing rate compared to female respondents, that is, female respondents chew food with a higher number of chewing strokes in one second. The automatic habitual chewing rate in general for all examinees from the control group (class I malocclusion) is 1.20 chewing strokes / second. In Class II / 1, the number of chewing strokes in a second was higher for male respondents, compared to female respondents, which was not the case with the respondents the control group. The automatic habitual chewing rate in general for all subjects in the group of malocclusion II / 1 is 1.30 chew.strokes / second. In Class II / 2, the number of chewing strokes in a second is greater for male respondents, compared with female respondents, just like in the Angle class II / 1, which is not the case with the subjects from the control group. The automated habitual chewing rate in general for all subjects in the group of malocclusion II / 2 is 1.27 chew.strokes / second. Conclusions: Studies have confirmed that the classification of Angle's malocclusions according to the morphological characteristics also shows differences in the function of the masticatory system. In other words, it is confirmed that there are significant differences in masticatory performance between classes I, II / 1 and II / 2 Keywords: mastication, electromasticatiography, masticatory muscles, mastication speed --------------------------------------------------------------------------------------------------------------------------------------- Date of Submission: 09-05-2018 Date of acceptance: 26-05-2018 --------------------------------------------------------------------------------------------------------------------------------------- I. Introduction Mastication is defined as an act of chewing food, representing the initial stage of digestion, when food is rubbed on small particles to facilitate swallowing. Mastication is an active process performed by rhythmic contractions of the masticatory muscles (m. temporalis, m. masseter, m. pterygoideus medialis et lateralis) and mimic muscles (m. orbicularis oris, m incizivus, m. quadratus labii superior, m. risorius, m. depressor anguli oris, m. depressor labii inferioris, m. mentalis, m. buccinator). Mastication consists of rhythmic and well-controlled separations and mergers of the maxillary and mandibular teeth. Each opening and closing movement of the mandible represents a mock stroke. A. da Silva Andrade et al. in their trials calculated the automatic habitual chewing rate, expressed as a proportion of the duration of mastication and the frequency of chewing strokes. II. Aim Of Study  To determine the masticatory efficacy by performing a specific mastication task in subjects with neutroocclusion and without any pathological changes to other components of the masticatory system (CONTROL GROUP). The average values from the test of the masticatory efficiency will represent the REFERENCE VALUES of the control group.  To determine the masticatory effect in subjects with Angle Class II  To determine the masticatory effect of individuals with grade 2 males class II