Age-related changes in ac-impedance spectroscopy studies of normal human dentine: further investigations
One of the age-related changes occurring in dentine structure is the formation of peritubular dentine on the inner walls of dentinal tubules leading to complete closure of tubules. Ac-impedance is safe, fast and non-invasive technique. In the last decade, the popularity of the technique has increase...
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| description | One of the age-related changes occurring in dentine structure is the formation of peritubular dentine on the inner walls of dentinal tubules leading to complete closure of tubules. Ac-impedance is safe, fast and non-invasive technique. In the last decade, the popularity of the technique has increased in dental research. Several investigators have used the technique to detect tooth cracks and caries. The results of in vitro studies showed that ac-impedance technique was more advanced for caries detection than visual and radiographic methods. However, other studies demonstrated that the accuracy of impedance measurements can be affected by many factors such as remineralization after tooth eruption. A study has been published on effect of age on impedance measurements by the authors for two age groups by employing ac-impedance spectroscopy. Therefore, the aim of this study was to demonstrate the importance of this technique by conducting further investigations on dentine samples of wider age groups. Dentine samples were prepared from extracted sound third molars of known patient age. The ac-impedance measurements were carried out over a wide range of frequency. After performing all electrical measurements, dentine samples were examined under SEM to correlate the electrical measurements with their structure. Impedance measurements showed that there were differences in impedance between young and old dentine. One-way ANOVA of the means of resistance and capacitance for all age groups (20, 25, 30, 40 and 50 years old dentine) revealed a significant difference (ANOVA,
P
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| doi_str_mv | 10.1007/s10856-009-3842-x |
| format | Article |
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P
< 0.0001) as a function of age. Applying Tukey’s post hoc test, to the same data showed that this difference was due to the 50 years old dentine for resistance and was due to the 40 and 50 years old dentine for capacitance which were statistically different to all other groups. SEM investigation of dentine samples showed that young dentine is characterized by open dentinal tubules distributed all over the sample while in old dentine most dentinal tubules were occluded by peritubular dentine. It is believed that this peritubular deposition is responsible for differences in impedance measurements. In spite of increasing use of electrical techniques to understand electrical properties of teeth, it is clear from this study that local structural variations have a marked influence.</description><identifier>ISSN: 0957-4530</identifier><identifier>EISSN: 1573-4838</identifier><identifier>DOI: 10.1007/s10856-009-3842-x</identifier><identifier>PMID: 19680605</identifier><language>eng</language><publisher>Boston: Springer US</publisher><subject>Adult ; Aged, 80 and over ; Aging ; Aging - physiology ; Biological and medical sciences ; Biomaterials ; Biomedical Engineering and Bioengineering ; Biomedical materials ; Ceramics ; Chemistry and Materials Science ; Composites ; Dental research ; Dentin - chemistry ; Dentin - physiology ; Electric Impedance ; Ent. Stomatology ; Fundamental and applied biological sciences. 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H.</creatorcontrib><creatorcontrib>High, A. S.</creatorcontrib><creatorcontrib>Kale, G. M.</creatorcontrib><title>Age-related changes in ac-impedance spectroscopy studies of normal human dentine: further investigations</title><title>Journal of materials science. Materials in medicine</title><addtitle>J Mater Sci: Mater Med</addtitle><addtitle>J Mater Sci Mater Med</addtitle><description>One of the age-related changes occurring in dentine structure is the formation of peritubular dentine on the inner walls of dentinal tubules leading to complete closure of tubules. Ac-impedance is safe, fast and non-invasive technique. In the last decade, the popularity of the technique has increased in dental research. Several investigators have used the technique to detect tooth cracks and caries. The results of in vitro studies showed that ac-impedance technique was more advanced for caries detection than visual and radiographic methods. However, other studies demonstrated that the accuracy of impedance measurements can be affected by many factors such as remineralization after tooth eruption. A study has been published on effect of age on impedance measurements by the authors for two age groups by employing ac-impedance spectroscopy. Therefore, the aim of this study was to demonstrate the importance of this technique by conducting further investigations on dentine samples of wider age groups. Dentine samples were prepared from extracted sound third molars of known patient age. The ac-impedance measurements were carried out over a wide range of frequency. After performing all electrical measurements, dentine samples were examined under SEM to correlate the electrical measurements with their structure. Impedance measurements showed that there were differences in impedance between young and old dentine. One-way ANOVA of the means of resistance and capacitance for all age groups (20, 25, 30, 40 and 50 years old dentine) revealed a significant difference (ANOVA,
P
< 0.0001) as a function of age. Applying Tukey’s post hoc test, to the same data showed that this difference was due to the 50 years old dentine for resistance and was due to the 40 and 50 years old dentine for capacitance which were statistically different to all other groups. SEM investigation of dentine samples showed that young dentine is characterized by open dentinal tubules distributed all over the sample while in old dentine most dentinal tubules were occluded by peritubular dentine. It is believed that this peritubular deposition is responsible for differences in impedance measurements. In spite of increasing use of electrical techniques to understand electrical properties of teeth, it is clear from this study that local structural variations have a marked influence.</description><subject>Adult</subject><subject>Aged, 80 and over</subject><subject>Aging</subject><subject>Aging - physiology</subject><subject>Biological and medical sciences</subject><subject>Biomaterials</subject><subject>Biomedical Engineering and Bioengineering</subject><subject>Biomedical materials</subject><subject>Ceramics</subject><subject>Chemistry and Materials Science</subject><subject>Composites</subject><subject>Dental research</subject><subject>Dentin - chemistry</subject><subject>Dentin - physiology</subject><subject>Electric Impedance</subject><subject>Ent. Stomatology</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Glass</subject><subject>Humans</subject><subject>Investigative techniques, diagnostic techniques (general aspects)</subject><subject>Materials Science</subject><subject>Medical sciences</subject><subject>Microscopy, Electron, Scanning - methods</subject><subject>Middle Aged</subject><subject>Models, Biological</subject><subject>Molar, Third - chemistry</subject><subject>Molar, Third - physiology</subject><subject>Mouth. Exocrine and endocrine salivary glands. Teeth. Esophagus</subject><subject>Natural Materials</subject><subject>Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques</subject><subject>Polymer Sciences</subject><subject>Regenerative Medicine/Tissue Engineering</subject><subject>Spectrum analysis</subject><subject>Spectrum Analysis - methods</subject><subject>Surfaces and Interfaces</subject><subject>Teeth</subject><subject>Thin Films</subject><subject>Vertebrates: digestive system</subject><subject>Young Adult</subject><issn>0957-4530</issn><issn>1573-4838</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>BENPR</sourceid><recordid>eNqNkUtrFTEYhoNY7LH6A9xIEMRVau4Xd6V4KRS60XVIczknZSYzJjOl_ffmcA4WBNFVFnm-N--XB4A3BJ8TjNXHRrAWEmFsENOcoodnYEOEYohrpp-DDTZCIS4YPgUvW7vDGHMjxAtwSozUWGKxAbuLbUQ1Dm6JAfqdK9vYYC7QeZTHOQZXfIRtjn6pU_PT_AjbsobcoSnBMtXRDXC3jq7AEMuSS_wE01qXXaw95T62JW_dkqfSXoGT5IYWXx_PM_Djy-fvl9_Q9c3Xq8uLa-S55AuSHN-GILlW0ngWMOVG6aRTIpLFwBTzvTnnXLhIktdaaqUSY4FiKQXxlJ2BD4fcuU4_117Ajrn5OAyuxGltVnEhTU_V_0EyYTjj_N8kY4YbpkQn3_1B3k1rLX1hSymhkhO2h8gB8v1PW43JzjWPrj5agu1erD2ItV2s3Yu1D33m7TF4vR1jeJo4muzA-yPgmndDqt1cbr85SkWPJKZz9MC1ftVt16eGf3_9Fzinuo8</recordid><startdate>2010</startdate><enddate>2010</enddate><creator>Eldarrat, A. 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Materials in medicine</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Eldarrat, A. H.</au><au>High, A. S.</au><au>Kale, G. M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Age-related changes in ac-impedance spectroscopy studies of normal human dentine: further investigations</atitle><jtitle>Journal of materials science. Materials in medicine</jtitle><stitle>J Mater Sci: Mater Med</stitle><addtitle>J Mater Sci Mater Med</addtitle><date>2010</date><risdate>2010</risdate><volume>21</volume><issue>1</issue><spage>45</spage><epage>51</epage><pages>45-51</pages><issn>0957-4530</issn><eissn>1573-4838</eissn><abstract>One of the age-related changes occurring in dentine structure is the formation of peritubular dentine on the inner walls of dentinal tubules leading to complete closure of tubules. Ac-impedance is safe, fast and non-invasive technique. In the last decade, the popularity of the technique has increased in dental research. Several investigators have used the technique to detect tooth cracks and caries. The results of in vitro studies showed that ac-impedance technique was more advanced for caries detection than visual and radiographic methods. However, other studies demonstrated that the accuracy of impedance measurements can be affected by many factors such as remineralization after tooth eruption. A study has been published on effect of age on impedance measurements by the authors for two age groups by employing ac-impedance spectroscopy. Therefore, the aim of this study was to demonstrate the importance of this technique by conducting further investigations on dentine samples of wider age groups. Dentine samples were prepared from extracted sound third molars of known patient age. The ac-impedance measurements were carried out over a wide range of frequency. After performing all electrical measurements, dentine samples were examined under SEM to correlate the electrical measurements with their structure. Impedance measurements showed that there were differences in impedance between young and old dentine. One-way ANOVA of the means of resistance and capacitance for all age groups (20, 25, 30, 40 and 50 years old dentine) revealed a significant difference (ANOVA,
P
< 0.0001) as a function of age. Applying Tukey’s post hoc test, to the same data showed that this difference was due to the 50 years old dentine for resistance and was due to the 40 and 50 years old dentine for capacitance which were statistically different to all other groups. SEM investigation of dentine samples showed that young dentine is characterized by open dentinal tubules distributed all over the sample while in old dentine most dentinal tubules were occluded by peritubular dentine. It is believed that this peritubular deposition is responsible for differences in impedance measurements. In spite of increasing use of electrical techniques to understand electrical properties of teeth, it is clear from this study that local structural variations have a marked influence.</abstract><cop>Boston</cop><pub>Springer US</pub><pmid>19680605</pmid><doi>10.1007/s10856-009-3842-x</doi><tpages>7</tpages></addata></record> |
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| subjects | Adult Aged, 80 and over Aging Aging - physiology Biological and medical sciences Biomaterials Biomedical Engineering and Bioengineering Biomedical materials Ceramics Chemistry and Materials Science Composites Dental research Dentin - chemistry Dentin - physiology Electric Impedance Ent. Stomatology Fundamental and applied biological sciences. Psychology Glass Humans Investigative techniques, diagnostic techniques (general aspects) Materials Science Medical sciences Microscopy, Electron, Scanning - methods Middle Aged Models, Biological Molar, Third - chemistry Molar, Third - physiology Mouth. Exocrine and endocrine salivary glands. Teeth. Esophagus Natural Materials Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques Polymer Sciences Regenerative Medicine/Tissue Engineering Spectrum analysis Spectrum Analysis - methods Surfaces and Interfaces Teeth Thin Films Vertebrates: digestive system Young Adult |
| title | Age-related changes in ac-impedance spectroscopy studies of normal human dentine: further investigations |
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