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.
The second type of retainer is a removable retainer. There are two types to choose from â a clear retainer and a Hawley retainer. Clear retainers are made from a thin clear plastic material that contributes to both their aesthetic appearance, and the minimal time needed to become adjusted while wearing them.
Types: Traditional (non-bonded). Used for: Fillings in back teeth. Lasts: At least 10 years, usually longer. Costs: The least expensive type of restorative material. Advantages. 1  Amalgam fillings are strong. 2  They can withstand the forces of chewing. 3  They are less costly than the alternatives. 4  Amalgam fillings can be completed in one dental visit. 5  They are less sensitive to moisture during the filling process than composite resin.