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1.
Stomatologiia (Mosk) ; 100(3): 13-18, 2021.
Artigo em Russo | MEDLINE | ID: mdl-34180619

RESUMO

OBJECTIVE: To study the effect of the occlusal surface of a natural tooth, cement-retained and screw-retained fixed partial dentures supported by dental implants and the coefficient of friction on the stress distribution in the peri-implant bone at maximum and minimum principal stresses. MATERIAL AND METHODS: Study of maximum and minimum principal stresses in models with natural teeth and artificial crowns supported by dental implants, taking into account the coefficient of friction using the finite element analysis. RESULTS: In models represented by fixed partial dentures supported by dental implants and a natural tooth, the maximum tensile stresses arise in the cortical bone in the cervical region of the artificial crown, and the maximum compressive stresses occur both in the cortical layer in the cervical region of the artificial crown and in the cervical region of the tooth. In models with two fixed partial dentures supported by dental implants or two natural teeth, the stress distributions in the cortical layers in the upper and lower jaw are almost identical. CONCLUSION: Modeling the antagonist and adding to the FEA model is important in order to determine the precise and realistic direction of the resulting force vector. Amplification of the number of contact areas should be considered when modeling the occlusal surface of artificial crowns supported by dental implants.


Assuntos
Implantes Dentários , Boca Edêntula , Coroas , Prótese Dentária Fixada por Implante , Análise do Estresse Dentário , Prótese Parcial Fixa , Análise de Elementos Finitos , Humanos , Estresse Mecânico
2.
Stomatologiia (Mosk) ; 100(2): 60-63, 2021.
Artigo em Russo | MEDLINE | ID: mdl-33874663

RESUMO

OBJECTIVE: To study the effect of morphological parameters of natural teeth and fixed partial dentures supported by dental implants on the time of occlusion. MATERIAL AND METHODS: The study of the morphological parameters of the first right upper and lower molars of natural teeth and fixed partial dentures supported by dental implants in the positions of the first molars of the upper and lower jaws, followed by determination of the relationship between the obtained data and the occlusion time using mathematical and statistical analysis. RESULTS: The study of the morphology of the occlusal surface of natural teeth and fixed partial dentures supported by dental implants did not reveal significant differences in the results of measuring the distances between the cusps of the upper and lower first molars, both natural teeth and fixed partial dentures supported by dental implants. However, the angles of the slopes of the cusps and the angles between cusps in natural teeth are sharper than those of artificial crowns. CONCLUSION: According to the correlation analysis in both groups, the relationship between the occlusion time and the morphological parameters of the lower molars was determined; the relationship between the morphological parameters of the upper molars and the occlusion time was not revealed.


Assuntos
Implantes Dentários , Boca Edêntula , Oclusão Dentária , Prótese Dentária Fixada por Implante , Prótese Parcial Fixa , Humanos
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