Abstract
The law of minimum vertical dimension (MVD) states that “when the mandible moves to reach the maximum intercuspal position, this always involves bringing the mandible and maxilla as close together as possible.” Therefore, after the first occlusal contact is made, the MIP will be reached through reduction of the vertical dimension. Our objective of this study, through an integrative review of the literature review, was to determine whether ignoring this law is a factor that contributes to malocclusion, temporomandibular joint dysfunction, and recurrences of functional orthodontic and orthopedic treatments.We conducted a search of the literature in five of the main electronic scientific databases. The following medical subject heading terms were used in our search: centric relation, dental occlusion, malocclusion, vertical dimension, and mastication. We cross-referenced the descriptors in the following four groups: centric relation and maximum intercuspation; occlusal plane and malocclusion; neuro-occlusal rehabilitation; and vertical dimension and unilateral chewing. From this, we selected 277 potentially eligible articles. Out of these, 209 were excluded in accordance with the exclusion criteria already described. Thus, 65 studies were included in the qualitative synthesis.The articles were also classified according to their impact factor and degree of recommendation, in conformity with the table of the Oxford Centre for Evidence-Based Medicine. The scientific interest in the scope of the articles was also assessed by using three charts developed according to year and country of publication and the percentage of publication. Unilateral chewing creates a vicious cycle of damage that leads to an ever-increasing masticatory deficiency. Most of the articles chosen for this review confirmed that noncompliance with law of MVD was a predisposing factor in cases of relapse, in functional orthodontic and orthopedic treatments, as well as a causal factor in malocclusion and in functional and morphological TMJ dysfunctions.
Highlights
One of the fundaments of functional jaw orthopedics, from a neuro-occlusal rehabilitation (NOR) perspective, is knowledge of existing laws and theories regarding craniofacial growth and development.1,2 The NOR philosophy, as conceived by Planas,3 can be defined as the part of dentistry in which the causes and the beginning of functional and morphological dysfunctions of the stomatognathic system are studied
The results indicate that differences between these jaw positions due to muscular asymmetries, chewing patterns, and facial asymmetry lead to alterations in the intra-articular spaces, confirming the hypothesis that going against law of minimum vertical dimension (MVD) may lead the TMJ to be functionally and/or morphologically compromised
Based on the articles selected, we can conclude that discrepancy between centric occlusion (CO) and maximum intercuspal position (MIP) may lead to a deviation or dislocation of the jaw toward the region, where the maximum of intercusp contacts is established and, in most cases, the preferred chewing side
Summary
One of the fundaments of functional jaw orthopedics, from a neuro-occlusal rehabilitation (NOR) perspective, is knowledge of existing laws and theories regarding craniofacial growth and development. The NOR philosophy, as conceived by Planas, can be defined as the part of dentistry in which the causes and the beginning of functional and morphological dysfunctions of the stomatognathic system are studied. Planas observed that bilateral mastication taking place on alternating sides and free from occlusal interference, with as many points of contact as possible during the masticatory cycles, conditions correct development of both the mandible and the maxilla. This confirms Claude Bernard’s principle that “the function creates the organ and the organ adapts to the function.” since mastication is one of the craniofacial development factors, it must be done on hard dry foods, that is, those that give rise to intensive work, with broad lateralized movement and as many physiological dental contact events as possible, obtaining greater efficiency.. This confirms Claude Bernard’s principle that “the function creates the organ and the organ adapts to the function.” since mastication is one of the craniofacial development factors, it must be done on hard dry foods, that is, those that give rise to intensive work, with broad lateralized movement and as many physiological dental contact events as possible, obtaining greater efficiency. The complexity of masticatory movements and their control and adaptability show the extent to which their variation can influence dental-alveolar growth, and maxillary-mandibular growth, with adaptation of structural morphology to working conditions.
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