Time-dependent decrease and seasonal variation of the porosity of recently erupted sound dental enamel in vivo
| Autor: | Y. Fennis-le, J.J. ten Bosch, Emiel H. Verdonschot |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
0301 basic medicine
Molar FISSURE ENAMEL Time Factors Every Six Months porosity Adolescent Tooth eruption Dentistry Dental Fissures Mandibular first molar Tooth Eruption Mandibular second molar 03 medical and health sciences TEETH 0302 clinical medicine stomatognathic system Preventie en vroegdiagnostiek van occlusale carieuze lesies Humans Medicine dental enamel time-dependence Child Porosity General Dentistry Orthodontics Prevention and early diagnosis of occlusal carious lesions Enamel paint business.industry DIAGNOSTIC SYSTEMS Dental Enamel Permeability Electric Conductivity 030206 dentistry Seasonality electrical conductance PERFORMANCE medicine.disease eruption stomatognathic diseases 030104 developmental biology Child Preschool visual_art visual_art.visual_art_medium Regression Analysis fissure Seasons business OCCLUSAL CARIES |
| Zdroj: | Journal of Dental Research, 79, pp. 1556-1559 Journal of Dental Research, 79(8), 1556-1559. SAGE Publications Inc. Journal of Dental Research, 79, 1556-1559 |
| ISSN: | 0022-0345 |
| DOI: | 10.1177/00220345000790080501 |
| Popis: | Recently erupted teeth are more sensitive to dental caries than teeth that have remained free from caries lesions for a few years after eruption. It has been hypothesized that this may be ascribed to differences in enamel porosity. The objective of the present work was to assess the time-dependence of electrical conductance, as an indication of porosity, of occlusal enamel in recently erupted permanent molar teeth. Fifty children aged 5-15 years of age, receiving regular dental care at six-month intervals, participated in the study when their first molar teeth (in 5- to 6-year-olds) or their second molar teeth (in 11- to 15-year-olds) had not been exposed to the oral environment for more than six months. On the first semi-annual check-up after eruption of a first or second molar, baseline diagnostic measurements, i.e., visual inspection and electrical conductance measurements (ECMs), were made at three or four pre-defined sites in the fissures. Subsequently, data collection was repeated every six months for three years. Sites were excluded from ECMs when a caries lesion was observed at a site by visual inspection. After 36 months, there were 257 sites in teeth considered sound upon visual examination. The ECM values of these sound sites showed a clear decrease with time after the first examination. The conductance decreased on average from 0.13 (MΩ)-1 to 0.059 (MΩ)-1. Since the conductance is assumed to be proportional to the porosity of the enamel, the latter decreased by a factor of 2.2 over the 36-month period. The results furthermore indicated a higher conductance for maxillary than for mandibular enamel. Almost all sites in that sample appeared to be in teeth that were observed for the first time during the months September to December. Electrical conductance, and therefore enamel porosity, of the sites showed a periodic variation with season of observation: In the fall, the conductance was higher than in the spring. This implies that a dentist should be more prudent in the fall than in the spring when indicating restorative treatment of an incipient caries lesion. |
| Databáze: | OpenAIRE |
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