EFFECT OF IRRADIATION ON TEETH. II. RADIOGRAPHIC EXAMINATION (ENGLISH TEXT)
The length of the dentine niche differed after irradiation was given as a single or fractioned dose. The animals (rats) were divided into 3 groups: (A) 600 r for 3 days, (B) 300 r for 6 days, and (C) 150 r for 12 days. No changes were seen 3 days after the exposure. Seven days after irradiation some disturbance of hard tissue formation in the proximal end of the maxillary incisor was seen in groups A and B. Fourteen days after irradiation, these changes were more exaggerataed with small tapering of the proximal end of the incisor. Microscopically, such an injured area coincided with a dentine niche. In group C, no niche was formed. Twenty-one days after irradiation, the x-ray shadow of the niche remained approximately the same in group A, with some nuance suggestive of recovery of hard tissue formation. In group C, irregularity in the teeth marrow was progressive. At 35 days after irradiation, there was still appearance of injured dentine in groups A and B, although appreciable signs of recovery were present. Within 47 days after exposure all groups showed an almost complete recovery. It was concluded that the radiographic method is a convenient and easy procedure for observing the hard tissue of the teeth. The soft tissue or cell changes may be adequately studied microscopically. (Abstr. Japan Med., 1: No. 9, 1961)
- Research Organization:
- Tokyo Medical and Dental Univ.
- NSA Number:
- NSA-15-025867
- OSTI ID:
- 4011049
- Journal Information:
- Bull. Tokyo Med. Dental Univ., Vol. Vol: 6; Other Information: Orig. Receipt Date: 31-DEC-61
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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