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.
The clear plastic ones look nicer, but will tend to wear out faster, and will need replaced periodically. You should bring these appliances with you to your regular dental checkups. This type of retainer is generally worn full time for at least 6 months and during the night for up to several years thereafter.A fixed wire bonded at the back of your front teeth: The fixed retainer is generally kept in place for at least 5 years, but we recommend lifelong wear.Removable retainers should be taken out during eating, high contact sports and when you brush your teeth. To clean the retainers, remove them first and brush them in tap water using a toothbrush and some toothpaste. fixed wire bonded at the back of your front teeth: The fixed retainer is generally kept in place for at least 5 years, but we recommend lifelong wear. Removable retainers should be taken out during eating, high contact sports and when you brush your teeth.