Mandibular protrusion
Introduction
Introduction Mandibular protrusion: abnormal relationship between the upper and lower arch can be expressed as mandibular protrusion, mesial and anterior teeth.
Cause
Cause
1. Bad oral habits
(1) Poor breast-feeding posture. If the bottle is not properly breast-fed, the jaw should be sucked forward and can cause the anterior teeth to reverse.
(2) A bad habit of biting the upper lip or the lower jaw may lead to the anterior teeth and the mandibular protrusion.
2. Local disorders in the dentition period
(1) Detention or early loss of deciduous teeth can cause individual anterior teeth to reverse or most anterior teeth.
(2) The early deciduous teeth are lost early, and the upper anterior teeth are moved backwards to form the anterior teeth.
(3) The cuspid teeth are insufficiently worn and higher than the plane of the arch. In order to avoid the early contact of the upper and lower jaw cusps, the lower jaw will move forward or sideways, forming a anterior or anterior teeth. False mandibular protrusion.
(4) The upper permanent incisors are congenitally missing. For example, the common maxillary lateral incisors are congenitally missing, which may cause insufficient development of the anterior maxilla and form a anterior teeth.
3. Disease
(1) The mandibular advancement is stimulated by chronic inflammation of the tonsil or lingual tonsils, which may lead to anterior teeth and mandibular protrusions.
(2) Patients with cleft lip and palate often have insufficient maxillary development, which is easy to cause the anterior teeth to be reversed and the middle jaw is relatively prominent.
(3) Patients with rickets, their calcium and phosphorus metabolism disorders and abnormal muscles of the facial muscles often lead to more severe mandibular protrusions or anterior teeth open deformities.
(4) Endocrine disorders, such as hyperactivity of the anterior pituitary gland, can cause mandibular protrusion.
4. Hereditary pre-abuse combined with mandibular anterior penetrating, with obvious family background, and abnormal mandibular and facial deformities.
Examine
an examination
Related inspection
Oral glucose tolerance test
The anterior teeth are reversed and partially combined with the posterior teeth. The facial surface can be expressed as a mandibular protrusion and a concave lateral shape with insufficient maxillary development.
Diagnosis
Differential diagnosis
Mandibular retraction is a malocclusion of the mandibular retraction caused by mandibular hypoplasia or congenital absence of the lower anterior teeth and pterygopalatine dysfunction.
The mandibular angle valgus refers to the wide mandibular angle, and the face looks like a ladder-shaped contour, lacking a soft feeling.
The anterior teeth are reversed and partially combined with the posterior teeth. The facial surface can be expressed as a mandibular protrusion and a concave lateral shape with insufficient maxillary development.
