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Korshunov A, Vagner V, Konev V, Moskovskiy S, Kuryatnikov K, Skurikhina A, Yakovlev V, Nurakhmetova A. Research of connective tissue dysplasia influence on teething. Saudi Dent J 2022; 34:385-389. [PMID: 35814839 PMCID: PMC9263759 DOI: 10.1016/j.sdentj.2022.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2021] [Revised: 05/05/2022] [Accepted: 05/08/2022] [Indexed: 11/13/2022] Open
Abstract
Purpose This work aimed to study the rate and quality of maturation of the mineral component of retained teeth 3.8, 4.8 and lower jaw fragment of a human in connective tissue dysplasia in different periods of postpartum ontogenesis. Methods The study involved 102 men (76 with connective tissue dysplasia and 26 without connective tissue dysplasia) divided into groups by age: 31–40, 41–50, 51–60 years. One tooth 3.8, 4.8 and a fragment of the alveolar part of the lower jaw in the projection of teeth 3.8, 4.8 0.5*0.5 cm in size were extracted from each examinee for medical indications. Results Low optical density values are observed at the age of 41–50 years, at the age of 51–60 years, indicating decreased mineral density and the presence of total areas of hypomineralization from the age 31–40 years in connective tissue dysplasia. At the age of 41–50, 51–60 years, at the boundary of connective tissue structures and periosteum, a pronounced sclerosis and deformation of delineation elements were observed; at the age of 31–40 years, the indicated changes were less pronounced. At the age of 31–40 years, the level of bone plate dissection has a local character, after 40 years, it has a generalized character. Conclusion Progressive osteoporosis of the mandible and incomplete amelogenesis are an obstacle to the correct and harmonious teething of the lower wisdom teeth after the age of 30.
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Mao J, Wang L, Jiang Y, Cheng H, Li N, Shi S, Fan F, Ma J, Huang S. Nanoscopic wear behavior of dentinogenesis imperfecta type II tooth dentin. J Mech Behav Biomed Mater 2021; 120:104585. [PMID: 34010797 DOI: 10.1016/j.jmbbm.2021.104585] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2021] [Revised: 05/01/2021] [Accepted: 05/09/2021] [Indexed: 10/21/2022]
Abstract
OBJECTIVES The aim of this study was to investigate the wear behavior of Dentinogenesis imperfecta type II (DGI-II) dentin and elucidate the correlation between its tribological properties and components. METHODS The mid-coronal dentin of normal and DGI-II teeth were divided into two groups: perpendicular and parallel to the dentin tubules. The microstructure of dentin was detected using atomic force microscopy (AFM). The wear behavior of dentin was evaluated by nanoscratch tests and scanning electron microscopy (SEM). Meanwhile, changes in molecular groups and chemical composition were analyzed by Raman and Energy-Dispersive X-ray (EDX) tests, respectively. Nanohardness was also evaluated. RESULTS AFM images of DGI-II dentin illustrated a decrease in the number of tubules and the tubule diameter. Nanoscratch test showed a higher friction coefficient and a greater depth-of-scratch in DGI-II dentin. The wear resistance of DGI-II dentin was reduced independent of tubule orientation. EDX results indicated that DGI-II dentin mineral content decreased and Raman spectra results showed DGI-II dentin had a decreased collagen matrix structure stability coupled with hypomineralization. Furthermore, a significant reduction in nanohardness and elastic modulus of DGI-II dentin was observed. Regression analysis revealed a close correlation between dentin components and inferior wear resistance. CONCLUSIONS All results indicated the wear behavior of DGI-II dentin was significantly deteriorated, presumably caused by the disorder in microstructures and the reduction of chemical composition.
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Affiliation(s)
- Jiajie Mao
- Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China; Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China
| | - Lin Wang
- Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China; Department of Endodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China
| | - Yun Jiang
- Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China; Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China
| | - Haoran Cheng
- Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China; Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China
| | - Ning Li
- Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China; Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China
| | - Shi Shi
- Department of Stomatology, Ningbo Huamei Hospital, University of Chinese Academy of Sciences, Ningbo, PR China
| | - Fan Fan
- Shanghai Jingan Dental Clinic, Shanghai, PR China
| | - Jianfeng Ma
- Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China; Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China.
| | - Shengbin Huang
- Institute of Stomatology, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China; Department of Prosthodontics, School and Hospital of Stomatology, Wenzhou Medical University, Wenzhou, PR China.
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Cisneros T, Zaytsev D, Seyedkavoosi S, Panfilov P, Gutkin MY, Sevostianov I. Effect of saturation on the viscoelastic properties of dentin. J Mech Behav Biomed Mater 2021; 114:104143. [PMID: 33176998 PMCID: PMC7839248 DOI: 10.1016/j.jmbbm.2020.104143] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 10/12/2020] [Accepted: 10/13/2020] [Indexed: 11/19/2022]
Abstract
This paper focuses on the analysis and quantitative characterization of the effect of saturation on the viscoelastic properties of human root dentin. Uniaxial compression tests under creep conditions have been performed on root molar dentin with tubules fully saturated with a viscous physiological fluid, as well as samples with non-saturated tubules (dry dentin samples). Blair-Rabotnov (BR) fraction-exponential model is used to characterize the overall viscoelastic properties of dentin and correlate them to the level of saturation. Experimental data are compared with theoretical predictions that interrelate the viscoelastic properties of saturated and dry specimens. The results show that saturation increases the viscous creep strains of dentin, which indicates a reduced capacity for stress relief. The uniaxial compression test under creep conditions, in combination with the BR kernel model, allows us to analyze the creep-relaxation behavior of dentin.
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Affiliation(s)
- Thomas Cisneros
- Department of Mechanical and Aerospace Engineering, New Mexico State University, Las Cruces, NM, 88003, USA
| | - Dmitry Zaytsev
- Institute of Natural Sciences, Ural Federal University, Ekaterinburg, 620000, Russia; The Institute of High-Temperature Electrochemistry of the Ural Branch of the Russian Academy of Sciences, Ekaterinburg, 620990, Russia
| | - Seyedali Seyedkavoosi
- Department of Engineering, University of Tennessee at Martin, Martin, TN, 38238, USA
| | - Petr Panfilov
- Institute of Natural Sciences, Ural Federal University, Ekaterinburg, 620000, Russia
| | - Mikhail Yu Gutkin
- Institute of Problems in Mechanical Engineering, Russian Academy of Sciences, St. Petersburg, 199178, Russia; Highest School of Mechanics and Control Processes, Peter the Great St. Petersburg Polytechnic University, St. Petersburg, 195251, Russia
| | - Igor Sevostianov
- Department of Mechanical and Aerospace Engineering, New Mexico State University, Las Cruces, NM, 88003, USA.
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