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People with this genetic disorder have 47 chromosomes instead of the 46 that would be the usual. Down syndrome is a genetic disorder that is caused by the additional presence of chromosome 21, which causes problems in the development of body and brain. People with Down syndrome have a common appearance characterized by a smaller-than-normal head, mouth and small ears, short and broad hands with short fingers, etc. Also, patients with the disorder suffers from social and mental retardation...

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Dacryocystorhinostomy operation is crying or constant watery eye. It is a procedure indicated for patients with blocked tear ducts. During surgery, a new drain line is created with tissue from the patient.

The Damon System is an orthodontic characterized without any binder, allowing freedom of movement of teeth and generating a placement of natural teeth.

Dandruff is a flaking white generated on the scalp and sometimes may be associated with other skin problems thereof, as seborrhea or psoriasis. Dandruff treatment varies with the severity of each case, but include various cosmetic preparations aimed at treating the underlying cause of their appearance and reduce the symptoms of itching and skin redness. Normally, shampoos or solutions are prescribed an antifungal active substance, intended to inhibit microbial growth, and combined with...

Deafness is hard of hearing or total inability to use this. If the loss is partial hearing loss is called if the total deafness.

Defecography is a non-invasive test for imaging various stages of defecation. It is used to help determine the cause of fecal incontinence, constipation, and other conditions such as pelvic floor prolapse.

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Delayed ejaculation in the vagina or anejaculation is the delay or total lack of expulsion of semen. The climax or orgasm is the climax of sexual excitement, during which increases the concentration of blood in the genitals, muscles contract erogenous zones and sexual tension is released. In man accompanies generally ejaculation. Sometimes, abnormal orgasm, i.e., delay or absence of orgasm, persistently or recurrently occur following a normal sexual excitement phase. The most common clinical...