Phonetics vs. Phonology â¢Phonetics: the study of speech sounds â¢Phonology: the study of the sound systems of languages (sound system = inventory of sounds + rules). Phonetics vs. Phonology â¢Phonetics says: ^The /k/ in call h[k h Él] and in key [k i] are phonetically distinct.
Retainers are fitted at the end of orthodontic treatment after the braces are removed. They can be either removable or fixed onto the teeth. There are different types of retainers. The choice of retainer is affected by a number of different factors and your orthodontist will explain which retainer is best for you. Sometimes you will be recommended to wear more than one type of retainer to reduce the chances of the teeth relapsing. Types of retainers. There are lots of different types of retainers. The commonest types of retainers used in the UK are the vacuum-formed retainer, the bonded retainer and the Hawley retainer.
Retainers are needed to hold the teeth in place once the braces are removed, but unfortunately, retainers are easy to break and lose. Once a retainer has been lost or broken, it needs to be replaced to keep the teeth in place. If you visit an orthodontist to have your retainer made the cost will be high, but there are alternatives to paying this price. Hawley Retainers are known to last the longest and can be ordered by mail for a lot less | Source. Retainers are used to hold the teeth in place after having orthodontic work done.