Results A two-year follow-up revealed there occurred butment caries,luxated butment,and overlain residual root gingivitis,even on the rise,while the alveolar ridge showed no uneven absorption.
The uneven corrosion, where deterioration rust was founded mainly in most bronze object, was composed of star corrosion, hole corrosion, slice corrosion and hypophloeodal corrosion.
The low temperature may also cause the heart coronarospasm, causes the cardiac muscle ischemia oxygen deficit, may induce the angina pectoris, the heart rhythm not to be uneven.