Abnormal tooth morphology

Introduction The shape and size of the teeth, like the physical appearance, are affected by genetic factors, and the mode of action is still unclear. A few under the influence of environmental factors, such as mechanical pressure, can also cause variations in tooth morphology. Common teeth Morphological abnormalities are as follows: malformed cusps, deformed sockets, deformed teeth, deformed teeth, curved teeth, etc. Due to the influence of genetic factors, the mode of action is still unclear. A few under the influence of environmental factors, such as mechanical stress during tooth development, due to systemic diseases, nutritional disorders or severe apical periodontitis infection, when vitamin C is deficient, odontoblasts degenerate, can not form normal dentin, serious Dentin development stops.

Cause

Causes of abnormal tooth morphology

Due to the influence of genetic factors, the mode of action is still unclear. A few under the influence of environmental factors, such as mechanical stress during tooth development, due to systemic diseases, nutritional disorders or severe apical periodontitis infection, when vitamin C is deficient, odontoblasts degenerate, can not form normal dentin, serious Dentin development stops. Denaturation of odontoblasts can affect the normal development of enamel. It can also cause variations in tooth morphology.

an examination

Related inspection

Oral endoscopic oral X-ray examination

Examination of abnormal tooth morphology

Deformity of cusp: The deformed tip of the maxillary incisor, the central tip of the deformed maxillofacial region. Occasionally, additional cusps can be seen on the molar.

Central cusp: A conical extra cusp occurs at the central fovea of the bicuspid maxillofacial region, which can occur on one or several or even all of the bicuspid. General symmetry occurs. The cusp height varies. (about 1-3mm), the structure is different, some of the horns protrude into the tip, and some of the medullary angle is not high, but the dentin extends into the tip.

According to Chinese scholars, the incidence of central tip is about 10%, and there seems to be racial differences in incidence. The literature reports that whites are rare, while the incidence of yellows is high. The thin and high central tip is easily broken. Exposure to the medullary angle causes chronic pulp infection.

Clinically, it is common to encounter double-toothed teeth without sputum, the roots of the teeth have not yet developed, and inflammation around the apex has appeared. When you check carefully, you can find the central fossa, or at the triangular ridge of the buccal side, with a central tip broken. Traces. Malformed side tongue (talon cusp). Clinical manifestations: common in the maxillary central incisor, lateral incisor tongue bulge, forming a conical cusp, shaped like a finger-like high cusp, so also known as the fingertip, the horn can protrude into the tip, the deformed side of the tip In deciduous teeth, permanent teeth can occur. The incidence of maxillary lateral incisors is greater than that of central incisors. Invaginated lingual fossa Clinically deformed tongue fossa is more common in maxillary lateral incisors, followed by maxillary central incisors, occasionally in canines. According to the depth of the invagination and its morphological variation, there are clinically deformed tongue fossa, malformed tongue groove, and dens in dente. The deformed tongue fossa is a lighter invagination. No obvious variation, only the tongue is deep.

The malformed tongue groove is a sulcus invagination with a rim-like shape. The groove seam divides the tongue bulge into two, and continues to extend to the neck of the tooth, and some even reach the root. The middle teeth are a serious type of enamel invagination. On the X-ray film, the cystic cavity of the central crown of the crown can be seen. The surrounding area is completely enamel, much like a small tooth in the crown, hence the name.

Fused teeth: clinically, according to the location of the fusion of the two teeth, the different shapes and forms are fusion teeth, combined teeth and twin teeth.

(1) fused teeth: a fusion of two tooth germs. A true fusion tooth means that the dentin is fused together, and the root canal can be one or two.

(2) Concresence of tooth: The teeth are joined together by two basically developed teeth.

(3) Geminated tooth: Two crowns that are completely separated or not completely separated can be seen clinically, and the roots are one or two. The two teeth of the genus are similar in morphology, which is developed by a tooth germ. Come, so called double teeth. The number of teeth is not missing, or may increase.

Differential diagnosis

Symptoms of abnormal tooth morphology

Abnormal number of teeth: The number of normal human teeth is 20 deciduous teeth and 28-32 permanent teeth. The abnormal number of teeth is the number of teeth or the number of teeth. The excess number of teeth is often associated with multiple teeth (also known as extra teeth) and dental tumors. . . . Insufficient number of teeth, also known as congenital missing teeth, there are individual missing teeth, partial missing teeth and full mouth missing.

Abnormal tooth structure: more common enamel hypoplasia, tetracycline stained teeth, dentin dysplasia.

Abnormal teeth eruption: more common in permanent teeth. Including early teeth, late teeth, teeth ectopic eruption.

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