Crowded and misaligned teeth

Introduction The clinical manifestation of dentition crowding is that the teeth are crowded and misaligned, mainly because the amount of teeth is larger than the amount of bone, and the shape of the arch is abnormal. It should be related to factors such as congenital factors and calcium deficiency. Crowded dentition has obvious genetic characteristics. From the crowded dislocation of individual teeth or the crowding of most teeth, even the degree of torsion of a certain tooth can have the same performance in the parental and offspring; the fault in the replacement period is caused by the dentition. Common causes of crowding, such as premature loss or retention of deciduous teeth, causing adjacent teeth to advance to occupy the edentulous gap, resulting in insufficient gaps in the eruption of permanent teeth and misplacement or subsequent permanent teeth eruption and dislocation. Insufficient development of the jaw causes a large amount of bone mass to be irregular, and the teeth cannot be arranged neatly in the alveolar, and the crowd is misplaced. Due to the excessive width of the teeth in the near and far, the teeth may be crowded and misaligned. Some bad oral habits, such as children's fingers, mouth breathing, etc., can cause the arch of the jaw to narrow or affect the development of the jaw, and the teeth are crowded.

Cause

The cause of malocclusion of tooth crowding

1. Genetic factors: Crowded crowds have obvious genetic characteristics, from the crowded dislocation of individual teeth or the crowding of most teeth, and even the degree of twist of a certain tooth, can have the same performance in the parents and offspring. This genetic trait is objective, but its detailed genetic mechanism is still not fully understood.

2. Failure during the replacement period: The failure of the replacement period is a common cause of crowding of the teeth. For example, due to the early loss of the deciduous teeth, the adjacent teeth move forward to occupy the missing tooth gap, resulting in insufficient gaps in the permanent teeth eruption time and dislocation. Another example is the retention of deciduous teeth, which can cause successive permanent teeth to be erroneous.

3. Insufficient development of the jaw: The lack of development of the jaw causes a large amount of bone mass to be irregular, and the teeth cannot be arranged neatly in the alveolar, and the crowd is misplaced.

4. Too large teeth: Due to the excessive width of the teeth in the near and far, the teeth may be crowded and misaligned.

5. Bad habits: Some bad oral habits, such as children's fingers, mouth breathing, etc., can cause the arch of the jaw to narrow or affect the development of the jaw, and the teeth are crowded.

an examination

Related inspection

Oral endoscopic oral X-ray examination

Dental crowding misalignment check

1. Small bone mass: the tooth has a normal width in the near and far direction, and the length of the arch is insufficient. In particular, the development of the anterior maxilla tends to cause crowding of the maxillary anterior teeth.

2. Large amount of teeth: As the upper anterior teeth area has more teeth or the tooth width is too large, the dentition is crowded.

3. Indexing: For the purpose of clinical diagnosis, the crowded dentition is generally divided into light, medium and heavy according to the severity of its crowding.

Mild crowding (I°) The gap between each arch is less than 5mm.

Moderately crowded (II°) The gap between each arch is less than 10 mm.

Severe crowding (III°) The gap between each arch is more than 10mm.

The clinical manifestation is that the teeth are crowded and misaligned, mainly because the amount of teeth is larger than the amount of bone, and the shape of the arch is abnormal.

Differential diagnosis

Symptoms of confusion caused by distorted teeth

Large gaps in the teeth: It is because of the poor development of the teeth or the large gap between the teeth caused by the damage of the posterior teeth, which leads to eating teeth or affecting the appearance of the teeth. First, when the teeth are changed, the growth of the permanent teeth is deviated, and the unevenness of the growth leads to sparseness and large gaps. Second, the gums may not develop well. The gums are the basis of dental support. If malnutrition occurs, it may lead to poor tooth development.

Abnormal tooth structure: refers to the abnormal development of teeth caused by various obstacles during tooth development or matrix calcification during tooth development, and leaves permanent defects or marks on the tooth tissue. Common enamels are: Dysplasia, dentine hypoplasia, dental fluorosis and tetracycline staining teeth.

Loose teeth and shedding: refers to the loosening of the teeth caused by external impact, periodontal disease, gum atrophy, nutritional aging of the old gums, etc., causing tooth loss after severe. Most adults suffer from periodontal disease. Most periodontal diseases progress slowly. Most of them are gingivitis at the beginning. There are not many symptoms other than occasional brushing, so it is not noticeable. The development of gingivitis to a certain extent is periodontitis. At this time, severe oral odor can occur, the abscess is repeated in the periodontal period, the teeth are loose, the teeth are getting bigger and bigger, and the teeth are getting sparse. If the patient is seen at this stage, the doctor can control the deterioration of inflammation, but the damaged periodontal tissues (including gum atrophy) are irreversible and difficult to recover completely.

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