| Summary: | 碩士 === 台北醫學大學 === 口腔復健醫學研究所 === 87 ===
The influence of the transient and strong load on periodontium was investigated. The age of 12 weeks old of sixty Sprague-Dawley rats were used as experimental animals. The left upper and lower first molars of each rat were loaded with a transient force of 1.5 kg used for experimental, but the contra-lateral first molar was served as the control. On the 12th hours, 1st, 3rd, 7th, 14th, 21st days the rats were harvested while they had been injected with the fluorescent calcein (10 mg/kg) before five days. The specimens were removed and then immersed by Villanueva bone stain for fluorescent and confocal laser scanning microscope observations.
The results showed that the cervical portions of the tooth and alveolar bony crest were destroyed by transient load on 1st and 3rd days. New bone and new cement were formed on 7th and 14th days. The upper arch of new bone formation seems to be faster than lower arch.
The above structural changes of the periodontal hard tissues explained the periodontium even loaded by transient and strong force still has repair function.
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