Is there difference between a photo holder and a filter line?

Hand switch is a lot of styles, there are one hand switch, two handlocks, three handlocks. One hand switch presses direct exposure to film, the second hand switch has one more preparatory button than the first hand switch, the second hand switch is prepared by pressing the next layer button, the second file is exposed, and the purpose of adding the preparation is to prevent the wrong trigger. One of the dental X-ray machine using a hand switch more.

First of all, dental X-ray machine, oral panoramic X-ray machine or dental X-ray machine, the dose of X ray is much smaller than that of general X-ray machine, so the radiation of X ray is also small. In addition, the oral cavity area is small, generally wonundefinedt resemble the whole body examination, easy to mistrigger and pat the wrong position, causes the mistake, therefore, the dentist uses the hand brake more, may achieve the operation simple and convenient, but also saves the money the goal.