More types of mobile phones, and the structure can be divided according to speed and low-speed high-speed mobile phones, high-speed mobile dental handpiece using high pressure air driven turbine handpiece for micro turbine speed can be up to 300,000 to 500,000 r / min, bur cutting speed can be up to 15m / s, while the low-speed mobile dental handpiece because it is gear, speed can be transferred per minute for thousands of 30000 rpm.
2013年9月8日星期日
gingival recession What harm
Gingival recession is a common disease in dentistry, dental health hazard gingival recession. Well, what harm gingival recession? When gums shrink after aging for teeth
Alveolar bone declining ability to transport nutrients and alveolar bone atrophy along with it shorter, oral medicine called "resorption phenomenon."
Gingival recession led to this "micro-joints" package to maintain strength reduction, teeth began to loosen, dental material and alveolar bone is absorbed, shallow roots of the teeth, dental
Teeth longer, with the growing phenomenon of increased bone resorption, teeth naturally fall off.
Gingival recession also led to root exposure (dentin part), no enamel surface of teeth, gums if there is no protection, not only easy when brushing
Subject to wear, while the cold, heat, acid stimulation is very sensitive to oral medicine called "dentin hypersensitivity", people often mistaken for this phenomenon is exposed tooth nerve conduction
Cause pain, which is wrong.
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