locking deformity
Introduction
Introduction Locking malformation: Locking is a misalignment of the posterior teeth. The individual posterior or most 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 on the knot. The buccal side of the posterior teeth is a locking deformity. Divided into positive locking and anti-locking: 1. Positive locking: the slanting surface of the tongue of the upper posterior teeth is engaged with the cheek slanting surface of the lower posterior teeth, and the occlusal surface has no occlusal contact. The positive locking of individual posterior teeth and the positive locking of most posterior teeth on one side are more common in clinical practice. 2. Anti-locking: It is the cheek slope of the upper cheek tip and the lower posterior tongue chamfering, and the joint has no occlusal contact. This mismatch is less common in the clinic.
Cause
Cause
1. Individual tooth locks may cause locks due to premature loss of individual deciduous teeth, retention or abnormal position of permanent teeth. The positive locking of the individual teeth of the upper and lower permanent molars is more common, mostly due to insufficient development of the length of the jaw arch and insufficient gap.
2. Most of the posterior teeth of the unilateral side 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. It is easy to form deep coverage on the side of the disused side for a long time. Most of the posterior teeth are locked.
Examine
an examination
Related inspection
Bone joint and soft tissue CT examination oral endoscope
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.
Diagnosis
Differential diagnosis
Abnormal tooth structure: refers to abnormality of tooth development caused by various obstacles during tooth development or matrix calcification during tooth development, and leaving permanent defects or marks on the tooth tissue.
Abnormal teeth: 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 small number of environmental factors, such as mechanical stress, can also cause variations in tooth morphology. Common abnormalities in tooth morphology include the following: malformed cusps, deformed sockets, deformed teeth, deformed teeth, and curved teeth.
Abnormal teeth eruption: more common in permanent teeth, because permanent teeth are more affected by deciduous teeth, such as deciduous teeth or early loss, trauma and so on. Common eruption abnormalities are: early teeth sprouting, eruption and ectopic eruption.
Insufficient number of teeth: The number of normal human teeth is 20 deciduous teeth and 28-32 permanent teeth. The abnormal number of teeth is manifested by insufficient or excessive number of teeth. Insufficient number of teeth, also known as congenital missing teeth, there are individual missing teeth, partial missing teeth and full mouth missing.
