Evaluation of the Caries Resistance of Tooth Enamel According to a Study on the Chemical Composition and Microstructure of the Tooth Surface During Its Physiological Maturation

Доменюк, Д. А.; Chukov, Sergej; Арутюнова, А. Г.; Иванюта, О О; Есауленко, Е. Е.; Дмитриенко, С. В.

doi:10.25207/1608-6228-2019-26-2-26-41

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…The decrease in enamel resistance in young animals is due to its insufficient mineralization after teething, the peculiarities of the enamel structure, and the specific structure (permeability, microhardness stability in an acidic environment) [13]. It is proved that the tooth enamel at the early stages of physiological "maturation" due to an insufficiently formed prismatic structure, lack of protective layer, significant permeability, large number of retention points has morphological characteristics of hypomineralization and low caries resistance and acid resistance [14]. This is confirmed by the data of clinical and laboratory studies, which indicate the crucial importance of the enamel mineralization processes in maintaining the state of caries resistance [15].…”

Section: Study Results and Discussionmentioning

confidence: 99%

Resistance of Enamel in Supra-Occlusion Contacts of Individual Teeth in Rats of Various Ages

Zviahin

Lakhtin

2020

EUMJ

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Introduction. Supra-occlusion is a position of a group of teeth or individual teeth, the cutting edge or chewing surface of which is located above the occlusal plane. This condition is characterized as primary traumatic occlusion, supra-contact or traumatic nodes, in which a number of structural and functional changes occur in the hard tissues of the teeth and periodontal tissue. Traumatic occlusion of teeth is often caused by occlusal intervention, such as high fillings or prostheses, parafunctional habits. In physiological conditions, the protection of teeth from chemical and mechanical interventions is provided by their structural and functional resistance. However, the influence of supra-occlusion on the resistance of tooth enamel, and especially in different age groups, has not yet been studied. Therefore, we consider this topic relevant. The objective of the work was to study the state of enamel resistance in supra-occlusal contacts of individual teeth in rats of various ages according to the enamel resistance test (ERT-test). Materials and methods. The study involved 36 white male laboratory rats aged 4 to 22 months and weighing 100 to 210 g. The animals were divided into two groups (control and experimental), each was divided into three subgroups (6 animals each) according to age categories: young, mature, old-aged. In the study group, the state of supra-occlusion was simulated by increasing the height of the lower right second molars via filling 1 mm in height, without preparation of hard tissues of the teeth. Previously, the animals were anesthetized intramuscularly with sodium thiopental solution. After removing the animals from the experiment on the 15th day by decapitation under general anesthesia with sodium thiopental, by intraperitoneal injection, the dental blocks were removed and the structural and functional state of the tooth enamel was determined by the ERT-test. Statistical processing of data was performed using the program AtteStat V.12.5 with the determination of the mean and its error (M ± m). The probable significance of the difference in the obtained data was determined by the Student's t-test (p ≤ 0.05). Study results. In the control group, ERT-test values decreased (enamel resistance increased accordingly) in rats, depending on age. In young rats, enamel resistance to acidic dissolution was the smallest, and in mature and old-aged rats it increased. However, the difference between the age groups was not statistically significant (p > 0.05). A similar situation was registered in animals of the study group. However, statistically significant differences were observed only between young and old-aged rats (p = 0.025). In the control group, the acid resistance of enamel is higher compared to study group (p = 0.007). In young rats from the control group, enamel resistance to acids was 16.7% higher than in the study group (p = 0.025). In mature animals of the control group, the resistance of enamel to acid dissolution is 17.7% higher than in the study group (p = 0.046), and in old-aged – by 15.2% (p = 0.2). Conclusions. The resistance of enamel of teeth that are subjected to increased stress via supra-occlusal interactions is reduced in young, mature and old-aged rats in comparison with the control group. Reduced enamel resistance can be one of the risk factors in the occurrence of dental caries.

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Section: Study Results and Discussionmentioning

confidence: 99%

Resistance of Enamel in Supra-Occlusion Contacts of Individual Teeth in Rats of Various Ages

Zviahin

Lakhtin

2020

EUMJ

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“…Restoration of tooth tissues with such defects presents certain difficulties, as a special approach to dissection, treatment, and the right choice of filling material is required. Besides, the general diseases of the body, which affect the process of loss of dental hard tissue, should be taken into account [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Transformation, Qualitative and Quantitative Microelemental Restructuring of Enamel in a Wedge-Shaped Tooth Defect of Classes I and Ii

Гажва¹,

Yakubova²,

Ibragimova³

et al. 2022

ArveMED

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Background. Over the past 20 years, the prevalence of wedge-shaped defects has increased by 14%, and in some countries of the world it reaches critical values - 82%. At the same time, the treatment of this pathology is carried out at the later stages of its development with excision of the hard tissues of the tooth and subsequent restoration, without taking into account the initial macro- and microstructural changes in the enamel. The purpose of our study was an experimental in vitro study of anatomical and morphological features of the tooth enamel structure, its qualitative and quantitative composition in the initial forms of a wedge-shaped defect. Materials. As the material for our study we used intact teeth removed for orthodontic indications and with initial forms of a wedge-shaped defect of classes 1 and 2 according to the classification of Shevelyuk Yu.V., Makeeva I.M. (2011), subsequently 63 sections were made out of these teeth. Methods: clinical, experimental, scanning electron microscopy and energy dispersive analysis, statistical, analytical. Results. Structural transformations of enamel were revealed in the initial forms of the wedge-shaped defect, the boundaries of the lesion were determined, and morphological changes were established in the tissues adjacent to the lesion involved in the pathological process against the background of quantitative and qualitative indicators of its chemical composition. Conclusion. a comparative analysis of the enamel microstructure in normal and wedge-shaped defects confirms the heterogeneity of the lesion and the transformation of the chemical, quantitative and qualitative composition of the enamel.

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Dynamics of Calcium and Phosphorus Content Under Express Exposure to Remineralizing Agents

Naronova,

Belokonova,

Molvinskikh

2023

Actual Problems in Dentistry

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The main components of tooth enamel are calcium and phosphorus, they also form the basis of remineralizing drugs. The article presents the results of determining the content of calcium and phosphorus (mmol/l) in the unstimulated oral fluid of the subjects, as well as the dynamics of change over time (before the start of the use of remineralizing agents, at 5 minutes, one hour after the start of the study), as well as the calculation of the Ca/P ratio. To assess the effect of the express effect of different remineralizing agents, relationships were found between the content of calcium and phosphorus ions in the unstimulated oral fluid: standard deviations of the content of calcium and phosphorus ions were calculated, and the coefficients of linear correlation r-Pearson were determined. If for the 1 group and the 2 group the standard deviation of calcium ion content before the experiment and after 5 minutes is quite close, then 1 hour after express exposure in both groups the calcium content differs by 2.5 times. Analysis of the standard deviation in the 1 and phosphorus 2 group shows that before the express exposure, the value in the 1 group is 1.8 times higher than in the 2 group, and 5 minutes after the express exposure, the values differ by 8.9 times, while 1 hour after the express exposure, the values in the 1 group and in the 2 group differ by only 1.4 times. The coefficients of the r-Pearson linear correlation vary over a wide range of values: from -0.60 to 0.95.

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Evaluation of the Caries Resistance of Tooth Enamel According to a Study on the Chemical Composition and Microstructure of the Tooth Surface During Its Physiological Maturation

Cited by 4 publications

References 6 publications

Resistance of Enamel in Supra-Occlusion Contacts of Individual Teeth in Rats of Various Ages

Resistance of Enamel in Supra-Occlusion Contacts of Individual Teeth in Rats of Various Ages

Microstructural Transformation, Qualitative and Quantitative Microelemental Restructuring of Enamel in a Wedge-Shaped Tooth Defect of Classes I and Ii

Dynamics of Calcium and Phosphorus Content Under Express Exposure to Remineralizing Agents

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