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: [email protected]
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)