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ORAL PHYSIOLOGY Cite this article: Borțun CM, Rusu LC. Recording of mastication angles by Planas’s laws. Stoma Edu J. 2014; 1(2): 86-91. RECORDING MASTICATION ANGLES BY PLANAS’S LAWS Cristina Maria Borțun1a, Laura-Cristina Rusu2b* 1. Department of Prostheses Technology, Faculty of Dentistry, “Victor Babeş” University of Medicine and Pharmacy, Timişoara, România 2. Department of Technology of Materials and Devices in Dental Medicine, Faculty of Dentistry, “Victor Babeş” University of Medicine and Pharmacy, Timişoara, România a. DDS, PhD, Professor and Dean b. DMD, PhD, Associate Professor Abstract Introduction: Planas’s fundamental laws are based on the neuro-occlusal concept, which plays a major role in the development and evolution of the stomatognatic system. The alterations of the masticatory functions contribute to the modeling of the structures that form the stomatognatic system. Methodology: The purpose of the study was to assess the masticatory stereotype of a group of young people and to analyse the functional masticatory angles. We have assessed the amplitude of the functional masticatory angles on a group of 20 students. The masticatory angles depend on the occlusal morphology (cusp size), age and masticatory movements. Results: Great alterations are present with patients with dento-maxillary anomalies, edentations, dental injuries and unilateral mastication. Conclusion: The data obtained allow us to improve the masticatory functions as part of a complex oral rehabilitation. The functional masticatory angles are asymmetric on a majority of cases. Keyword: Planas’s laws; modeling of the stomatognatic system; evaluation of the functional masticatory angles. INTRODUCTION Received: 22 November 2014 Accepted: 15 December 2014 * Corresponding author: Laura-Cristina Rusu, Associate Professor, “Victor Babeş” University of Medicine and Pharmacy, Timişoara, România, Faculty of Dentistry, Department of Technology of Materials and Devices in Dental Medicine Adress: Faculty of Dentistry, 9, Bd Revoluției din 1989, Timișoara, România Tel/Fax: 0256/220 480, e-mail: laura.rusu@umft.ro 86 When we speak about mastication analysis, we usually refer to the mastication stereotype, without concrete data. These data, based on clinical research, should be clearly presented to the patient or patient`s parents in order to explain the treatment needs to them Planas [1] processed a basic and simple analysis of the masticatory angles based on a series of clinical observations. He noticed that functionally insufficient mastication causes a series of alterations of the alveolar bone, the mucosa and dento-periodontal components, with specific repercussions on all the components of the stomatognatic system. He also observed during the clinical studies that neuro-occlusal rehabilitation is achieved only by stimulating a correct masticatory function, which is essential for the neutral morphology of the stomatognatic system . Planas studied and described the physiology of the masticatory function providing us with methods for an adequate treatment. They are defined as Planas’ development laws (the law of antero-posterior and transversal development, the vertical development of premolars and molars, the vertical development of incisors and the development of the occlusal plan) which make possible the evaluation of the consequences and adaptive mechanisms of the elements making up the stomatognatic system, as a consequence of mastication. The functional angles of mastication guide orthodontists to expand the study of their patients’ stomatognatic system. The neuro-occlusal rehabilitation is based on the conclusion that the the masticatory function plays a major role in the optimal development and evolution of organs and structures (alveolar bone, periodontium, muscles, and temporomandibular joint and teeth position on the dental arch), that make up the stomatognatic system. Therefore, it becomes an imperative to know the masticator stereotype and equalize the masticatory angles for correct oral rehabilitation. STOMA.EDUJ (2014) 1 (2)