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 of dermal fillers. There are several different types of dermal fillers. Dermal fillers differ in chemical make-up, longevity, and have varying degrees of softness. Softer fillers are used in the lips, for example, while sturdier fillers might be desired to enhance cheekbones.