wear
Introduction
Wear profile Chronic wear of hard tissues of the teeth caused by mechanical friction alone is called wear, and uniform and appropriate wear is important for the health of periodontal tissues. For example, since the cusp is worn, the pressure from the side when chewing is reduced, and the shape of the cusp and the function of the periodontal tissue are adapted to each other. In addition, the wear of the crown can reduce the length of the clinical crown and maintain the coordination of the length of the crown root, so that the periodontal tissue is not overburdened due to the leverage. Wear can be caused during normal chewing. This physiological wear is called chewing wear. Others are not tooth wear due to the normal chewing process. It is a pathological phenomenon and is collectively referred to as non-chewing wear. basic knowledge The proportion of illness: 0.065% Susceptible people: undecided people Mode of infection: non-infectious Complications: periodontal disease, periapical disease, traumatic ulcer
Cause
Cause of wear
Wear can be caused during normal chewing. This physiological wear is called chewing wear. Others are not tooth wear due to the normal chewing process. It is a pathological phenomenon and is collectively referred to as non-chewing wear.
Prevention
Wear prevention
Correct the habit of chewing hard food and bad oral habits, such as chewing on one side.
Complication
Wear complication Complications periodontal disease periapical periodontal traumatic ulcer
Wear can also cause various complications or become a cause of illness.
1. Dentin hypersensitivity: This symptom of soreness can sometimes be gradually reduced and disappeared within a few months; sometimes it can last longer without getting better, the degree of sensitivity often varies from person to person, generally the process of wear and tear The faster the exposed area, the more pronounced the soreness.
2. Food impaction: When chewing food, due to the shape of the surface defined by the edge ridge and the developmental groove, it is generally beneficial for the food to deviate from the interdental space. After the tooth is worn, the plane replaces the normal convex surface, thereby increasing the cusp orientation. The effect of the interdental space being wedged into the food; the shortening of the worn crown and the wear of the adjacent surface can cause food caulking and promote the occurrence of periodontal disease and adjacent facial paralysis.
3. Endodontic and periapical lesions: caused by excessive exposure to the medullary cavity.
4. Temporomandibular joint disorder syndrome: Severe facial wear can cause the vertical distance between the jaws to be too short, which can cause temporomandibular joint lesions.
5. Trauma: Uneven wear can leave high and steep cusps and cause trauma.
6. Traumatic ulcers: excessive sharp teeth and edges left by uneven wear can stimulate the cheeks and tongue mucosa, which can cause local ulcers.
Symptom
Wear symptoms common symptoms molar trauma
1. History: should pay attention to the presence or absence of systemic diseases, such as gastrointestinal disorders, neurosis, dry mouth disease history; the habit of chewing hard food and bad oral habits, such as unilateral chewing.
2. Clinical manifestations: the enamel is partially worn, revealing pale yellow dentin, which can cause tooth sensitivity. If the enamel is worn out, dental pulp disease may occur or the medullary cavity may be locked. Uneven wear may cause occlusal trauma, food impaction and teeth. Periorbital tissue and mucosal damage, severe wear of the full mouth can also cause temporomandibular joint disease.
3. Auxiliary examination: X-ray teeth can be taken to understand the relationship between the medullary cavity.
A dead zone or a transparent layer is formed in the exposed part of the dentin; the part of the medullary cavity corresponding to the exposed dentin forms a repairing dentin; the medullary changes occur in the pulp, and the amount of repaired dentin is determined depending on the exposed dentin area. The exposed time and the reaction of the pulp, with the formation of the repaired dentin, the volume of the pulp cavity can be gradually reduced.
1. Chewing wear: also known as attrition, generally occurs in the face or cutting edge, but in the case of dentition disorder, it can also occur in other tooth surfaces, because the retention time of the deciduous teeth is shorter than the permanent teeth, so its chewing wear The degree is not as good as that of permanent teeth. After the permanent teeth erupted for several years to several decades, the posterior teeth, the face and the anterior teeth have obvious chewing wear, and a smooth facet appears on the tip or the ridge of the tooth. Flattening; as the age increases, the chewing wear is more obvious, the height of the teeth is reduced, the slope is flattened, and the tooth has a smaller diameter in the near and far distance. In some areas of the tooth, the enamel is completely worn to a sharp edge, the tooth Intrinsic exposure, due to the slight movement of each tooth during chewing, the contact points of adjacent teeth rub against each other, and wear will occur, making the original point contact become a planar contact, which easily causes food jamming, adjacent surface Oh, and periodontal disease. The degree of wear depends on the hardness of the teeth, the hardness of the food, the habit of chewing and the tension of the masticatory muscles. The degree of wear is proportional to the age of the patient, the friction and chewing force of the food, and inversely proportional to the hardness of the teeth.
2. Non-chewing wear: The loss of hard tissue of the teeth caused by abnormal mechanical friction is a pathological phenomenon. Bad habits and certain occupations are the causes of such wear, such as women using dental braces to develop clips, carpenters, Shoemakers, garment workers often use teeth to pinch nails, needles or bite lines, and bruxism can also cause severe wear.
Examine
Wear inspection
X-ray teeth can be taken to understand the relationship between the medullary cavity.
Diagnosis
Wear diagnosis
There is no difficulty in diagnosing according to clinical manifestations, but physiological wear and pathological wear are to be identified.
The wear of the teeth is a physiological phenomenon that benefits both the supporting tissues of the teeth and the chewing function.
The premature wear and tear caused by the development of the hard tissue of the teeth, the dentition caused by the degradation of the human evolutionary jaw system, and the resulting uneven wear are all pathological wear.
