A dental assistant. hold a current Arizona Board-approved certificate in radiology. To obtain a certificate, one must: 1a. Pass the national DANB Radiation Health and Safety (RHS) exam, AND. 1b. Receive the Arizona Radiologic Proficiency Certificate, issued by DANB, or. 2a.
Parkinson's disease (PD) is a type of movement disorder. It happens when nerve cells in the brain don't produce enough of a brain chemical called dopamine. Sometimes it is genetic, but most cases do not seem to run in families. Exposure to chemicals in the environment might play a role.
Parkinson's Disease. Parkinson's disease is a progressive and chronic nervous system disorder that affects movement and is caused by destroyed nerve cells in the brain. Although the progression of the disorder will vary from patient to patient, the development is often gradual, with symptoms sometimes going unnoticed for years. There is no cure for Parkinson's disease, but symptoms can be treated, and in some cases improved, with certain medications and other forms of treatment. It is estimated that approximately 50% to 80% of those with Parkinson's disease will eventually develop at least mild dementia, while up to 20% will develop full-blown dementia.