Lock

Lock introduction The lock is a misalignment of the posterior teeth. The posterior or posterior teeth of the upper jaw are locked to the buccal side of the lower posterior teeth, or the individual posterior or most posterior teeth of the lower jaw are locked in the cheeks of the upper posterior teeth. Side, for the lock deformity. About 25% of the causes of occlusal malformation are genetic factors, and most of the rest are caused by acquired environment. According to the survey, about 80% of cases are preventable, so prevention is very important. Prevention should start from the fetal period, mother During pregnancy, nutrition should be strengthened to enhance the physical condition of the fetus. Infants should be breast-fed in the infancy, so that the mandible can be used for proper mandibular advancement, and the muscles of the tongue, lips and cheeks can be coordinated to develop the maxillofacial muscles. The period is a period of vigorous growth and development of children. Not only should we pay attention to the proper improvement of diet and nutrition, but also pay attention to properly improve the hardness of food, so that the structure of children can be fully stimulated. basic knowledge The proportion of illness: 0.004%-0.007% Susceptible people: no specific population Mode of infection: non-infectious Complications: malformation dysphagia

Locking cause

Abnormal misalignment (30%):

Individual dental locks may be caused by early loss of individual deciduous teeth, abnormal position of stagnant or permanent tooth germs, and misalignment eruption, resulting in locking, and the positive locking of individual teeth of the upper and lower permanent molars is more common, mostly due to insufficient development of the length of the jaw arch. Insufficient clearance.

Early loss (30%):

Most of the unilateral posterior teeth are often locked. Because most of the deciduous teeth on this side are severely damaged or prematurely lost, they have to be chewed with the contralateral posterior teeth. The long-term disused side is easy to form deep coverage, which is developed by deep cover and becomes the majority. The teeth are positively locked.

Lock prevention

About 25% of the causes of occlusal malformation are genetic factors, and most of the rest are caused by acquired environment. According to the survey, about 80% of cases are preventable, so prevention is very important. Prevention should start from the fetal period, mother During pregnancy, nutrition should be strengthened to enhance the physical condition of the fetus. Infants should be breast-fed in the infancy, so that the mandible can be used for proper mandibular advancement, and the muscles of the tongue, lips and cheeks can be coordinated to develop the maxillofacial muscles. The period is a period of vigorous growth and development of children. Not only should we pay attention to the proper improvement of diet and nutrition, but also pay attention to properly improve the hardness of the food, so that the structure of the child is fully stimulated and the chewing function is improved. In addition, it is also important to keep the mouth clean.

Locking complications Complications, malformation, dysphagia

1. Due to the locking relationship of the positive locking effect on the tangential movement of the mandible, only the non-locking side of the posterior teeth can be chewed laterally, so the chewing function is reduced.

2. Due to the lock, it can cause abnormal dynamic balance of the mandible-related muscles, forming asymmetry of left and right mandible development and facial asymmetry deformity.

3. Due to the lock, it is easy to induce temporomandibular joint disease in some susceptible patients.

Locking symptoms common symptoms premature loss of chewing function lock deformity facial deformity

Divided into positive locking and anti-locking

1. The positive locking is the slanting surface of the upper lingual tongue and the cheek slanting surface of the lower posterior teeth. The occlusal surface is not occlusal contact. The positive locking of the posterior teeth and the positive locking of the unilateral majority of the posterior teeth are clinically More common.

2. The anti-locking is the cheek oblique surface of the upper posterior buccal tip and the lower posterior tongue oblique plane, and the joint surface has no occlusal contact, and the misalignment is rare in clinical practice.

Clinical manifestations:

Locking deformities are more common in permanent occlusion, less common in deciduous teeth.

1. Due to the positive locking relationship, affecting the lateral movement of the lower jaw, only the non-locking side of the posterior teeth can be chewed laterally, so the chewing function is reduced.

2. Due to the lock, it can cause abnormal dynamic balance of the mandible-related muscles, forming asymmetry of left and right mandible development and facial asymmetry deformity.

3. Due to the lock, it is easy to induce temporomandibular joint disease.

Lock inspection

Stomatological examination.

Lock diagnosis

Positive locking means that the lingual surface of the upper jaw and the tip of the tongue is located on the buccal side of the cheeks of the cheeks of the lower jaw, and there is no occlusal contact on the face. It is more common in clinical practice; anti-locking refers to the cheek slope of the upper and lower cheeks and the lower back. The tongue of the tongue is occluded, and the occlusal surface is not occluded. It is rare in clinical practice.

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