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1.
Stomatologiia (Mosk) ; 100(4): 37-43, 2021.
Artigo em Russo | MEDLINE | ID: mdl-34357726

RESUMO

The article is devoted to the development of methods and software for 3D analysis of the occlusal surface of teeth and occlusal contacts between antagonists. An algorithm for accurately determining the boundaries of the occlusal surface on the tooth surface for subsequent quantitative analysis: the area of the occlusal surface, the relief index, and the height of the cusps is presented. The area of not only direct contacts, but also near-contact zones in any of the selected surface separation ranges is quantified. Examples with geometric primitives and clinical examples explain the features and interpretation of 3D analysis datas obtained using the developed software.


Assuntos
Oclusão Dentária , Software , Humanos
2.
Stomatologiia (Mosk) ; 100(4): 104-108, 2021.
Artigo em Russo | MEDLINE | ID: mdl-34357737

RESUMO

On the example of a clinical case of functional TMJ disorders associated with loss of bite height, an algorithm for virtual determination of the Central relation position of the jaws based on the controlled width of the articular gap and the height of the bite is described. The subsequent 3D design and application of the repositional splint showed the reality of achieving the pre-planned position and the possibility of implementing the proposed approach in clinical practice.


Assuntos
Mandíbula , Côndilo Mandibular , Oclusão Dentária , Humanos , Mandíbula/diagnóstico por imagem , Articulação Temporomandibular/diagnóstico por imagem
3.
Stomatologiia (Mosk) ; 100(3): 60-64, 2021.
Artigo em Russo | MEDLINE | ID: mdl-34180627

RESUMO

The study is devoted to the error analysis of digital registration of lower and upper jaws laboratory and intraoral scans in position of habitual occlusion. It was found that in both cases, penetrating contacts (supracontacts) are formed, and their depth is in the range (-50) - (0) microns. The number and area of these contacts is higher for lateral teeth. The number and area of supracontacts is higher for laboratory scanning (3.7±1.81 mm2) than for intraoral scanning (0.5±0.42 mm2). Applying virtual contact optimization does not change the localization of contacts, but rather normalizes them in both cases. It is recommended to perform this preliminary correction before the planning stage in 3D dental treatment.


Assuntos
Modelos Dentários , Dente , Oclusão Dentária , Imageamento Tridimensional , Maxila
4.
Stomatologiia (Mosk) ; 99(2): 97-104, 2020.
Artigo em Russo | MEDLINE | ID: mdl-32441083

RESUMO

AIM: To develop a method for automated analysis of TMJ elements based on computed tomography and a method for analyzing the features of the ratio of TMJ elements when changing the position of the mandible without repeated CT examination. MATERIAL AND METHODS: To complete method required a computer tomogram of the temporomandibular joint in habitual occlusion recorded on spiral or cone-beam imaging; and 3D scans of the dentition obtained with intraoral and laboratory scanners; computer software - 3D graphics editor that can handle volumetric CT data and 3D mesh objects. RESULTS: Analysis of the joint space of the temporomandibular joint in the entire volume, not a single slice represents a more complete and reliable information about the condition of the joint. The presented method of predicting the position of TMJ heads on the basis of obtaining bite registers eliminates the probable errors of the doctor and the need for repeated CT scans, which reduces the radiation load on the patient. Virtual simulation of movements of the mandible from the position of habitual occlusion in the position of Central correlation, protrusion, right and left literaturesee with the visualization of movements of the articular heads helps to better understand the biomechanics of the TMJ, diagnostics and to obtain valuable data about the individual characteristics of the masticatory apparatus of the patient. CONCLUSION: The developed virtual articulator (patent No. 2567604) is another useful step in the development of digital technologies in dentistry.


Assuntos
Transtornos da Articulação Temporomandibular , Articulação Temporomandibular , Simulação por Computador , Tomografia Computadorizada de Feixe Cônico , Humanos , Mandíbula
5.
Stomatologiia (Mosk) ; 99(1): 55-60, 2020.
Artigo em Russo | MEDLINE | ID: mdl-32125303

RESUMO

AIM: To increase the efficiency of diagnosis and orthodontic treatment of patients with temporomandibular joint dysfunction based on the study of the relationship between the features of the position of the heads of the lower jaw and various face types in patients aged 25 to 44 years according to cone beam computed tomography. We examined 100 people who were divided into two main groups (50 males, 50 females). To study the formed groups index method for diagnosing facial types according to Isar was used. The facial indicator was determined: the percentage of physiognomic height to the morphological width of the face. The structural features and relative positions of the TMJ bone structures in patients with TMJ dysfunction in various face types were studied in the Avantis 3D computer program. It was noted that the upper position of the lower jaw heads in women and men with a narrow type of face was observed in 50% and 40% of cases, respectively; the distal position of the lower jaw heads in women and men with a wide type of face was observed in 50% and 42.3% of cases, respectively. The results of the study indicate that there is a relationship between different types of face and the position of the lower jaw heads in the lower jaw, which should be considered in comprehensive treatment planning. The most at risk of temporal dysfunction is the TMJ of a woman with a narrow type of face, in which dominates the upper position of the lower jaw heads and a woman with a wide type of face with the distal position of the lower jaw heads. Before orthodontic treatment it is necessary to investigate the position of the TMJ heads with the help of CBCT and make a mandatory correction before the beginning of orthodontic treatment.


Assuntos
Síndrome da Disfunção da Articulação Temporomandibular , Articulação Temporomandibular , Adulto , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Masculino , Mandíbula , Raios X
6.
Stomatologiia (Mosk) ; 98(6): 83-89, 2019.
Artigo em Russo | MEDLINE | ID: mdl-31922516

RESUMO

AIM: To compare the precision of centric relation (CR) assessment by various methods using digital technologies. MATERIAL AND METHODS: Determination of the CR was carried out in the clinic of prosthetic dentistry on patients with intact dentition using methods of bilateral manipulation, anterior jig, leaf gauge and device for intraoral recording of the gothic arch angle. Optical jaw impressions were obtained using the intraoral 3D scanner Trios (3Shape) and the CR registers were scanned using the laboratory scanner Prime (DOF). To evaluate the reproducibility of the CR, the computer program of 3D modeling Avantis (Russia) was used, which integrated the obtained optical impressions and digital copies of the CR registers. RESULTS: None of the methods showed 100% accuracy in CR assessment. The most stable reproducibility of the position of the mandible in the CR relative to the first registration was determined by the method using an anterior jig (of our own design) and amounted to 0.119±0.012 mm, which is significantly less than using the methods of bilateral manipulation (0.225±0.028, p≤0.05) and a leaf gauge (0.207±0.02, p≤0.05). We observed a similar mean values of the reproduction accuracy when determining the CR by recording the Gothic arch angle (0,120±0,013, p≤0.05), which also has a significantly lower value (p≤0.05) compared to other methods for CR determining.


Assuntos
Técnica de Moldagem Odontológica , Modelos Dentários , Relação Central , Desenho Assistido por Computador , Arco Dental , Humanos , Imageamento Tridimensional , Reprodutibilidade dos Testes , Federação Russa
7.
Stomatologiia (Mosk) ; 96(6): 40-43, 2017.
Artigo em Russo | MEDLINE | ID: mdl-29260764

RESUMO

Spectrophotometric analysis of the extract and intact teeth revealed the color characteristic of teeth ranged from the cervical area to the cutting edge, as well as by preparation of dental hard tissue to 0.3 mm, 0.6 mm, 0.9 mm depth. Lightness increased as preparation approached dentine. The intensity of the Lightness was more pronounced in the cervical region which is associated with a thin layer of enamel performing the lens function. It is found that Hue values weakly depend on the depth and location of the preparation, the tooth reflecting a relatively constant range of visible wavelengths. During preparation of the hard tissue at different depths the color difference δE* was greater than 2.6 meaning that the color must be registered before and after preparation.


Assuntos
Cor , Esmalte Dentário/química , Dentina/química , Preparo do Dente/efeitos adversos , Dente/química , Humanos , Espectrofotometria
8.
Stomatologiia (Mosk) ; 95(3): 44-48, 2016.
Artigo em Russo | MEDLINE | ID: mdl-27367198

RESUMO

This article describes the formula for calculating the aesthetic index of treatment outcome. The formula was derived on the basis of the obtained regression equations showing the dependence of visual assessment of the value of aesthetic violations. The formula can be used for objective quantitative evaluation of the aesthetics of the teeth when smiling before and after dental treatment.


Assuntos
Dentição , Estética Dentária , Avaliação de Processos e Resultados em Cuidados de Saúde/métodos , Humanos , Sorriso , Dente
9.
Stomatologiia (Mosk) ; 95(2): 54-57, 2016.
Artigo em Russo | MEDLINE | ID: mdl-27239998

RESUMO

The aim of the study was the investigation of the effect of two factors on the diameter changings of different types of retraction cords. Using an optical microscope MBS-10 (x10) the diameter of the different retraction cords was measured. The measurement also was performed after tension and after wetting cords with distilled water. The cords diameter decreased after their tension and increased after wetting. The degree of diameter changes depends on the kind of cords weaving. Braided cords "00" and "1" sizes diameter after it tension decreased at 31% and 37%, knitted cords under tension changed the diameter at 53% and 48%, correspondingly. Cords features after wetting also varied. Wetting of the braided cords with distilled water did not lead to significant diameter changes while wetting of knitted cords increases their diameter at 13% (00) and 15% (1).


Assuntos
Técnica de Moldagem Odontológica , Materiais Dentários , Técnicas de Retração Gengival , Laboratórios Odontológicos , Teste de Materiais , Água
10.
Stomatologiia (Mosk) ; 94(3): 36-40, 2015.
Artigo em Russo | MEDLINE | ID: mdl-26271701

RESUMO

The article presents a study on the impact of violations of aesthetic parameters as the inclination of the incisalline, thedislocation of median interincisal line and the width of dental arch on visual perception. Comparison of the data of objective assessment data the subjective assessment of the respondents was conducted. It is proved that all dependencies are linear and can be described by a linear regression equations. A similar method can be used for objective quantitative method for the assessment of aesthetics teeth when you smile before and after dental treatment.


Assuntos
Dentição , Estética Dentária , Percepção Visual , Arco Dental/anatomia & histologia , Humanos , Masculino , Autoavaliação (Psicologia) , Sorriso
11.
Stomatologiia (Mosk) ; 94(5): 8-10, 2015.
Artigo em Russo | MEDLINE | ID: mdl-26953420

RESUMO

In an experimental study on mini-pigs demonstrated that the use of collagen matrix Mucograft open method leads to the formation of mature connective tissue around the implants, more pronounced after 70 days, and the width of attached mucosa already 45th day (from 4.4 ± 0.3 to 7.7 ± 0.5 mm) is comparable to that of free gingival graft. Three-dimensional computer modeling of jaws experimental animals showed the soft tissue augmentation by 0.8 ± 0.1 cm3 after use of collagen matrix Mucograft and 1.1 ± 0.12 cm3 after free gingival graft.


Assuntos
Colágeno/uso terapêutico , Tecido Conjuntivo/fisiologia , Implantes Dentários/efeitos adversos , Gengiva/fisiologia , Retração Gengival/cirurgia , Regeneração , Animais , Simulação por Computador , Gengiva/patologia , Imageamento Tridimensional , Modelos Animais , Mucosa Bucal/patologia , Mucosa Bucal/fisiologia , Mucosa Bucal/cirurgia , Procedimentos Cirúrgicos Ortognáticos , Suínos , Porco Miniatura
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