Missing wisdom teeth

Introduction Missing teeth are incisors that have not grown due to cleft palate. Belongs to pathological phenomena. There is also a familial missing tooth, mostly the third molar (wisdom tooth), followed by the upper incisor and the second double canine before the lower molar. In late adolescence, the jaw develops to the size of an adult. But some people's jaws are not big enough, and there is not enough position for the wisdom teeth to erupt. The wisdom tooth will be trapped inside the jaw and grow in other directions. It may be that only part of the crown is exposed to the gums or completely buried in the jaw bone. It is dangerous that the root may deform or grow in the area of the maxillary sinus or mandibular nerve. If the wisdom tooth does not come out and the horizontal length is long, it is called the horizontal impact wisdom tooth. Generally, it will squeeze to the outer teeth, so that the outer teeth are extremely crowded and easy to toothache.

Cause

Familial missing teeth are caused by dysplasia of the ectoderm. Since the wisdom tooth is in the innermost part, the daily brushing is not easy to clean, and it is easy to produce tooth decay, and the wisdom tooth often has pain due to insufficient germination space, and also invades the adjacent teeth, causing toothache. Because there is no pair of teeth, sometimes the wisdom teeth will sprout excessively, which will affect the bite; sometimes it will become insufficient to become the impacted teeth, causing the dentition to be irregular, the periorbital space infection, and difficulty in opening the mouth.

an examination

Related inspection

X-ray lipiodol angiography

Four third molars on the upper and lower sides of the alveolar bone. The position of the wisdom tooth starts from the incisors, and the number of teeth is counted inward by one of the incisors. If there is an eighth tooth, it is a wisdom tooth. Some wisdom teeth do not grow even if they are halfway up. This condition is called wisdom tooth impact. Due to lack of space, the impacted wisdom teeth grow in a variety of different directions, generally forming an angle with adjacent teeth. It can grow toward adjacent teeth (near-angle obstruction), away from adjacent teeth (in the far middle, it can be angle-impeded), or it can be horizontally or vertically blocked.

Differential diagnosis

A tooth that fails to develop and form during tooth formation is called a congenital missing tooth. According to its severity and whether it is accompanied by systemic symptoms, it can be divided into several categories, but different literatures have different classification criteria and names for congenital missing teeth. In the past, most of the literatures were divided into congenital missing teeth by the severity of congenital missing teeth: edentulism, which refers to the lack of one or several teeth; less tooth disease, which means that most teeth are not formed, and usually accompanied by systemic abnormalities; Toothlessness refers to extremely severe tooth loss and full mouthlessness.

Four third molars on the upper and lower sides of the alveolar bone. The position of the wisdom tooth starts from the incisors, and the number of teeth is counted inward by one of the incisors. If there is an eighth tooth, it is a wisdom tooth. Some wisdom teeth do not grow even if they are halfway up. This condition is called wisdom tooth impact. Due to lack of space, the impacted wisdom teeth grow in a variety of different directions, generally forming an angle with adjacent teeth. It can grow toward adjacent teeth (near-angle obstruction), away from adjacent teeth (in the far middle, it can be angle-impeded), or it can be horizontally or vertically blocked.

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