Irradiation effects on microhardness of fluoridated and non‐fluoridated bovine dentin

European Journal of Oral Sciences - Tập 105 Số 5P1 - Trang 444-447 - 1997
Andrej M. Kielbassa1, Inka Beetz1, A. Schendera2, Elmar Hellwig1
1Department of Operative Dentistry and Periodontology, University Clinic of Dentistry, Albert‐Ludwigs‐University, Freiburg i. Br., Germany
2University Clinic of Radiotherapy, Albert-Ludwigs-University, Freiburg i. Br., Germany

Tóm tắt

The objective of this study was to evaluate the effects of irradiation on microhardness of dentin. Dentin blocks from the cervical region of bovine incisors were treated as follows: (1) no irradiation; (2) irradiation of specimens up to 60 Gy (2 Gy/day, 5 days/week); (3) no irradiation, but fluoridation of specimens for 5 min/d; (4) irradiation of specimens and daily fluoridation. Knoop hardness number (KHN) of the control specimens was 62.63 ±14.75 (mean ± SD). This was significantly different from the irradiated dentin samples (8.74 ± 2.59 KHN). Hardness of the fluoridated dentin specimens was 11.19 ± 1.95 KHN in the non‐irradiated group and 10.03±2.76 KHN in the irradiated groups, respectively. Within the limitations of an in vitro study, it is concluded that dentin is severely affected by irradiation. This could be an explanation for the frequently observed side‐effects of irradiation like loss of enamel, gap formation at the amelodentinal junction, and caries of the cervical region. Fluoridation with acidic gels decreases microhardness of dentin surface, and does not prevent softening due to radiation, when saliva is absent.

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Thông tin xuất bản

European Journal of Oral Sciences

Tập 105 Số 5P1

444-447

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