Consider the following examples of two different types of statistical investigations. Example 1 Radio rating services sometimes collect data on listenership by asking participants to record the date, time, and station each time they listen to the radio.
Popular types of invisible braces include ceramic brackets, inside braces and clear aligners. Ceramic braces are just like metal braces, except that they use tooth-colored brackets (and sometimes tooth-colored wires) rather than metal to straighten teeth.
Type 4: Self-Ligating Braces. Similar to traditional metal and ceramic braces, self-ligating braces make use of the bracket and wire system. This may be the type of braces that most orthodontist use today, but many still use a more traditional system. This type of braces uses brackets with clips or doors that hold on to the wire, instead of the rubber band tie system. These braces are supposed to hold on to less food and be less painful than other types of braces, and they are also supposed to reduce the number of trips to the orthodontist the patient has to make.