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IJHSR. 2015; 5(12): 209-213


The Relationship between Static and Dynamic Occlusion in Natural Permanent Dentition: A Descriptive Epidemiological Study.

Soumaya Touzi, Marwa Chakroun, Siwar Ben Abderrahmen, Rim Kallala, Dalenda Hadyaoui, Belhassen Harzallah, Mounir Cherif.

Abstract
Introduction: The canines are involved predominantly in the lateral excursion movements thanks to the considerable height of their crowns, powerful root implantation in the bone and their orientation in the arch which helps a particularly good periodontal proprioception. Receptors constantly inform the central nervous system on the spatial position of the mandible and appropriate muscles.
Materials and methods: The primary role of the canine in the movements of mandibular lateral excursion motivated us to conduct a survey, concerning 220 subjects, through which we aim to:
- Determine the prevalence of different types of protection in lateral excursion and the frequency of mandibular canine participation.
- Search for the existence of a possible correlation between the type of protection and Angle class.
Results: Canine protection consists primarily by Angle Class II up to 31.25%. Half of the subjects with protection group are in Angle Class I, 33.33% of subjects with balanced occlusion are in Angle Class III. Non canine participation consists in 31.25% of subjects with Angle Class II
Conclusion: According to our study, there is a significant relationship between static and cinematic occlusion: the protection group is mainly attributed to patients with angle class I. while for patients with Angle class II, canine protection is more common. Other factors must be taken into account when assessing overall occlusal scheme such as changes in the occlusion with age for the same subject, the presence of interference and wear facets.

Key words: lateral excursions, canine, protection, Angle classification.



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