Biomechanicalevaluation of Stress-Strain Condition of Restorative Ceramic Pin Structures and Dental Roots

Садыков, Мукатдес; Nesterov, Alexandre; Domenyuk, Dmitry; Ertesyan, Albert; Konnov, Valery; Matrosov, Vladislav

doi:10.35630/2199-885x/2020/10/2.29

Cited by 4 publications

(2 citation statements)

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“…As a response to the impact of such aggravating factors as pain, blood loss [7], mechanical tissue damage [1][2][3][4][5], hypoxia [6], increased free radical oxidation [8,9], a non-specific neuroendocrine reaction appears [10]. Consequently, the influence of different types of therapeutic approaches for the treatment of post-prosthetic complications is reflected in the dynamics of changes in serum concentrations of both catecholamines (epinephrine, norepinephrine) [11] and glucocorticoids (cortisol) -hormones of the medulla and the adrenal cortex [12]. Determining the level of cortisol is an important indicator in the diagnosis of a stressful situation.…”

Section: R E L E V a N C Ementioning

confidence: 99%

Immunological Assessment of the Stress Response in Patients With Inflammatory Postprothetic Complications

Makedonova¹,

Михальченко²,

Kurkina³

et al. 2021

ArveMED

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Post-prosthetic complications during dental implantation are accompanied by pain symptoms leading to disorders of the psychoemotional state. All this influences the behavior of patients. In addition, psychoemotional stress is often a factor of provocation and persistence of the complications. The presence of a stress state in the identified pathology, as well as the influence of various therapies on the treatment of post-prosthetic complications, is reflected in the dynamics of changes in the concentrations of both catecholamines (epinephrine, norepinephrine) and glucocorticoids (cortisol) — hormones of the medulla and the adrenal cortex. The aim: to conduct an immunological analysis of the stress response in patients with postprosthetic complications during dental implantation. Materials and methods: The study was performed in 120 patients with post-prosthetic complications during dental implantation before and during treatment: Group I (control) — 30 patients treated with the conventional therapy; group II — 30 patients treated with ozone therapy in addition to the conventional therapy; group III — 30 patients treated with transcranial electrical stimulation in addition to the conventional therapy; Group IV — 30 patients treated with a combination of conventional therapy, ozone therapy and transcranial electrical stimulation. The concentration of epinephrine, norepinephrine, cortisol, alkaline phosphatase, and the Garkavi index were evaluated. Results: The change in these indicators after the treatment indicates the normalization of the level of the studied enzymes — markers of bone homeostasis, which is confirmed by an improvement in the clinical picture in the oral cavity. Conclusion: changes in immunological parameters objectively reflect the psychoemotional state of patients. The nature of changes in the hormonal stress response to the treatment of post-prosthetic complications indicates the effectiveness of the therapeutic regimens used, and, as a result, a decrease in both pain symptoms and psychoemotional stress.

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Section: R E L E V a N C Ementioning

confidence: 99%

Immunological Assessment of the Stress Response in Patients With Inflammatory Postprothetic Complications

Makedonova¹,

Михальченко²,

Kurkina³

et al. 2021

ArveMED

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“…At Step 2 (Fig. 4b), a load of 20 N was applied as well, featuring constant intensity at an angle of 45° relative to the longitudinal axis of the tooth [13].…”

Section: A T E R I a L S A N D M E T H O D Smentioning

confidence: 99%

Biomechanical Assessment Ofthestress-Strain Status Ofsplinting Structures and Teeth Periodontium in Case of Chronic P

Садыков¹,

Nesterov²,

Domenyuk³

et al. 2020

AREM

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The authors have proposed an all-cast pin splint, whose technological feature is the ceramic lining of the over-the-bar part, which acts as a covering aesthetic structure, provides better distribution of the functional load and binds firmly mobile teeth affected by chronic moderate localized periodontitis. The paper offers a view at the outcomes of a comparative analysis of the stress-strain state of periodontal tissues, teeth, and cortical bone in chronic moderate localized periodontitis at the anterior group of teeth in the lower jaw, when they are splinted with a specially designed splint and a conventional metal-ceramic monolithic splint by finite element modeling. The developed 3D mathematical model included, as the initial data, the features of the periodontium, of dental tissue and of cortical bone. There was an examination carried out focusing on the distribution of stresses, which occur when using the designed splint under the impact of multidirectional loads of 130 N, acting strictly down relative to the tooth longitudinal axis (vertically), and a load at an angle of 45°. The proposed method of splinting reduces the maximum stress in the periodontium at a vertical load by 26.9%, while at a side load of 45° it reduced the stress by 34.7%, if compared to a traditional monolithic metal-ceramic splint.

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Evaluation of Fitting Accuracy of Metal Frameworks of Fixed Dentures Depending on Their Length

PARKHOMENKO¹,

SHEMONAEV²

2022

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Objective: To carry out a comparative analysis of the accuracy of the adherence of tooth-supported cast and milled cobalt chrome alloy frameworks in the shoulder area depending on the length of the prostheses. Methods: For the clinical trial 314 patients who needed metal-ceramic fixed dental prostheses (FDPs) were recruited. Metal frameworks of prostheses were made with conventional lost-wax technique (CLW) and computer aided design and manufacturing (CAD/CAM). To assess the accuracy of the adhesion of the frameworks to the ledges of the prepared teeth stumps, the silicon film between the abutment teeth and inner surface of crowns was obtained, cut into 8 pieces and measured in the shoulder area. The marginal gaps were measured using ImageJ2 application from digital photos obtained with calibrated digital microscope (250×). The data obtained were analyzed using the non-parametric Kruskal-Wallis H-test and Mann- Whitney U-test. Results: The average values of the marginal gap in the CLW group ranged from 71.9±7.6 μm in single and double crowns to 117±3.7 μm in prostheses with a length of 7-8 units. With a corresponding increase in the length of the prostheses, the average values of the marginal gap in the CAD/CAM group were from 67.1±6.8 μm to 90.8±8.3 μm. Differences in marginal clearance parameters between all groups were statistically significant (p<0.05), except for the group of single and paired crowns with milled caps. Conclusion: The values of the edge gap in all groups were within the acceptable range. However, CAD/CAM frameworks were significantly more accurate in long-length prostheses. Keywords: Teeth prep, CAD/CAM, accuracy of the fit, ledge, precision of the fit, marginal gap.

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Biomechanicalevaluation of Stress-Strain Condition of Restorative Ceramic Pin Structures and Dental Roots

Cited by 4 publications

References 0 publications

Immunological Assessment of the Stress Response in Patients With Inflammatory Postprothetic Complications

Immunological Assessment of the Stress Response in Patients With Inflammatory Postprothetic Complications

Biomechanical Assessment Ofthestress-Strain Status Ofsplinting Structures and Teeth Periodontium in Case of Chronic P

Evaluation of Fitting Accuracy of Metal Frameworks of Fixed Dentures Depending on Their Length

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