<unk> , from the Latin impingere, is a medical term used to describe several different types of blockage.<unk>  is a pathological condition in humans when an impassable mass of stone-like faecal matter collects in the rectum. It frequently occurs as a result of dehydration, inactivity, and medications, such as narcotics or psychotropicagents, which slow the peristalsis, and increase the time that the colonic mucosa will extract moisture from the faecal bolus. 
Treatment involves attempts at moving the<unk>  by enema and, failing that, breaking up the<unk>  transrectally by using a (gloved) finger, pressing the mass against the coccyx to fracture it into smaller pieces. Proceeding this, A follow-up enema is usually required in addition to proper ongoing hydration, bulk in the diet, exercise and review of all medications to discontinue all those responsible is important to prevent recurrence.<unk>  is also used, in conjunction with filtration, to remove large dust particles and other foreign objects as they enter the body through the nose.
Dental<unk> s are often known to occur when there is not enough room in the jaw for new molar teeth to erupt properly.  This can lead to a variety of dental problems, including cysts.  There are several types of dental<unk>
Impaction
Perseveration
Derealization
Disgust
Exaptation
Supination
Dissociation 
Burial