Dentofacial System Research Articles

ОТ ЕДИНСТВА К МНОГООБРАЗИЮ ФОРМ В ПРИРОДЕ

<p>The questions of unity and variety of forms in nature are discussed In the presentpaper. Refers to the process of shaping the teeth, structural and functional unit of the tooth is determined: canine module – odontomer. The common structure of the tooth, hand and foot is demonstrated, moreover the morphological similarity is manifested at the stage of human embryo – histogenesis. Thus, at the stage of bookmarks, formation, growth and development of certain organs of a human embryo (hands, feet and teeth) one can see some similarity of their structure, the internal order of the morphological units (fingers, enameldentinal rollers), which describes the universal law of creation – "the golden proportion" . Dentists have to know the anatomy of the organs and tissues of the oral cavity very well when restoring the teeth. Also dentists should study their phylogeny, anthropogeny,ontogeny in order to reconstruct the missing tissue in their original form, in harmony. The stages of dental restorations made of composite materials based on modular technology are shown.</p><p>We have proposed a matrix model for shaping the crown of a tooth. At the base of a tooth crown several modules – odontometrs are laid, which are directed to the fissure of the first order. A doctor deliberately puts missing edges, filling empty spaces with composite material, thus performing a specific algorithm of a tooth construction. While restoration the missing tissue you operate with the canine tooth module and composite material and fill a tooth crown.</p><p>Thus, we consider a canine tooth as the initial unit, fractal part of ontogenesis of dento-facial system of a person in accordance with the set laws which are typical for the modular (fractal) structural organization.</p>

Cryotherapy in stomatology. State-of-the-art

Increasingly more attention has recently been given by practicing clinicians to the physiotherapeutic methods that influence the human body in a variety of ways. Specifically, they affect the dentofacial system. Cryotherapy is an efficacious physiotherapeutic modality characterized by the high therapeutic effectiveness and allowing the use of pharmaceutical products to be reduced to a minimum.

Occlusion: The gateway to success

Success of our clinical procedures is not a single-day entity, but instead survival on a long-term basis. The clinical longevity of our work is dependent on so many factors and when we have a closer look, all these ultimately depend on the occlusal stability. The word occlusion itself creates aversion for almost all and very conviently we try to avoid the occlusal principles thinking that we have to bother about the principles only for tempeoro-mandibular joint disorder patients. In an irony, it is true that the principles of occlusion have to be applied in our day-to-day practice to be successful. This article aims to simplify the principles of occlusion so that the readers develop interest in this most rewarding subject. Also, the clinical implication of the occlusal concepts and the treatment modalities are explained to give the readers an insight into how important this subject is for our day-to-day practice.Clinical Relevance to Interdisciplinary Dentistry Important to understand the principles of occlusal harmony, to have a better approach to clinical examination, treatment panning. And problem solving for any restorative cases. The failure to embrace sound occlusal principles leads to a plethora of fringe-type treatment modalities and unnecessary overtreatment. If the signs of occlusal disease can be easily observed at the earliest stages, the progression of the damage can be intercepted. Not respecting the dento-facial system may result in restoration, prosthesis, or periodontal treatment failures, along with relapse of orthodontic and orthognathic surgeries.

A network approach to orthodontic diagnosis

Network analysis, a recent advancement in complexity science, enables understanding of the properties of complex biological processes characterized by the interaction, adaptive regulation, and coordination of a large number of participating components. We applied network analysis to orthodontics to detect and visualize the most interconnected clinical, radiographic, and functional data pertaining to the orofacial system. The sample consisted of 104 individuals from 7 to 13 years of age in the mixed dentition phase without previous orthodontic intervention. The subjects were divided according to skeletal class; their clinical, radiographic, and functional features were represented as vertices (nodes) and links (edges) connecting them. Class II subjects exhibited few highly connected orthodontic features (hubs), while Class III patients showed a more compact network structure characterized by strong co-occurrence of normal and abnormal clinical, functional, and radiological features. Restricting our analysis to the highest correlations, we identified critical peculiarities of Class II and Class III malocclusions. The topology of the dentofacial system obtained by network analysis could allow orthodontists to visually evaluate and anticipate the co-occurrence of auxological anomalies during individual craniofacial growth and possibly localize reactive sites for a therapeutic approach to malocclusion.

Effects of maxillary molar intrusion with zygomatic anchorage on the stomatognathic system in anterior open bite patients

The aim of this study was to evaluate the effects of intrusion of the maxillary posterior teeth with zygomatic anchorage on the dentofacial system, on electromyographic (EMG) activity of the masticatory muscles, and on vibration of the temporomandibular joint. The study sample consisted of 19 subjects (13 females, 6 males) with a mean age of 17.7 years. Lateral cephalometric and posteroanterior (PA) radiographs, EMG, and electrovibratographic (EVG) records were obtained before (T0) and after (T1) intrusion. Paired t- and Wilcoxon signed ranks tests were used for statistical evaluation. Maxillary molar intrusion of 3.37 ± 1.21 mm was obtained with a force of 400 g in an average period of 6.84 ± 1.64 months. At T1, all measurements showed that facial growth direction, ANB angle, convexity, and overjet were decreased (P < 0.05). SNB angle, facial depth, and overbite were significantly increased (P < 0.05). Upper lip-E plane distance was increased (P < 0.05). Evaluation of the PA radiographs showed that the right and left molar reference angles were unchanged. EMG and EVG analysis showed that the stomatognathic system at T0 was maintained at T1. Intrusion of the maxillary posterior teeth with zygomatic anchorage is an effective treatment alternative for anterior open bite correction.

Biomechanics of the human dentofacial system

The role of biomechanical pressure in the functioning of the human organism, in particular, the dentofacial system, is discussed. Some problems concerning this problem are indicated. We consider in most detail a biomechanical model as applied to the treatment of a congenital cleft of the hard palate. An important element of the model is taking into account growth strains of a living tissue, and parameters of the appropriate constitutive relation are determined experimentally. An analysis of results of a solution obtained by the finite element method is performed.

Concepts sur l'orthodontie du futur : spéculations ou illusions ?

Due to complex computer modeling it will soon be possible in the future to evaluate orthodontic protocols with systems biology for the dentofacial complex. Also one will be able to simulate the processes of development of the teeth and the head this way, as well as environmental factors influencing these processes. It is certain that everything that is already used in other biological systems, will one day also be used in the dentofacial system and from there also in orthodontics. Before it comes to that, a lot of data still remain to be gathered by reductionistic experiments.