cracked tooth
Introduction
Introduction to the crack Also known as incomplete tooth crack or micro-crack, refers to the non-physiological fine crack on the surface of the crown, often difficult to be found. Because clinical practice is common and cracks are easily overlooked, clinicians should pay sufficient attention. The cracked teeth occur in the maxillary molars, followed by the mandibular molars and the maxillary premolars. The first molars are significantly more than the second molars, especially the proximal middle jaw. This is the main working tip of the upper and lower jaw chewing movements. It bears the greatest synergy and has the most suitable cusp alignment with the central fossa of the mandibular molar. Although the maxillary molar has a slanting ridge, due to the uneven cusp and tight occlusion of uneven wear, it is easy to occur at the mid- or distal fovea of the joint, the gap between the tip of the cheek or the tip of the tongue. Cracked. basic knowledge The proportion of illness: 0.001%-0.003% Susceptible people: no special people Mode of infection: non-infectious Complications: pulpitis
Cause
Cause of cracked teeth
1. The weak link of the tooth structure is the susceptibility factor of the occurrence of the cracked teeth. These weak links not only have low crack resistance, but also the parts where the teeth are subjected to normal, force and stress concentration.
2. The larger the cusp slope, the greater the horizontal component, and the more chances of cracking.
3. Trauma, force, when the pathological wear appears high and steep cusps, the cusp inclination also increases significantly, and the horizontal component force generated during normal occlusion also increases, forming a traumatic, force, glaze at the bottom of the pit Deepening and widening the direction of the dentin is the beginning of the cryptic crack. Under the continuation of the force, the crack gradually deepens toward the pulp, so the trauma is the cracking factor of the crack.
Prevention
Tooth crack prevention
1. Injury, injury, trauma, and tooth restoration surgery are the main factors that form the crack of the teeth.
2, note, intention to prevent sports injuries, young people play, ride, run, etc., sometimes trauma, they broke the teeth, because the cracks are subtle, can not be found for a while, when the symptoms appear after the teeth, only see cracks.
3, the treatment of rickets to treat the teeth too thin, due to excessive or unbalanced bite force, resulting in cracks, even chapped.
4, treatment of tooth filling is too high or metal canopy, etc., can cause the impact of the teeth, cracked.
Complication
Dental cracking complications Complications
Can be complicated by rickets, or secondary pulp congestion, pulpitis, pulp necrosis and apical inflammation.
Symptom
Tooth cracking symptoms Common symptoms Toothache, molars, red, swollen dentures, pain, dentition, sparse
1. History often has symptoms of chewing discomfort or occlusion pain.
2. The clinical manifestations mostly occur in the bicuspid and molar. The maxillary first molar is most common. If you observe it carefully, you can find the dark or dark brown crack line, which may cross the tooth, face, or may only be seen at the adjacent edge. There is often pain in the cracked part of the cotton swab or in the diagnosis.
3. Auxiliary examination with iodine or gentian violet can make the crack clear, cold test is more sensitive at the crack.
The location of the occlusion is overlapped, and the position of some pits overlaps and extends to one side or both sides. The occlusion of the maxillary molar is often overlapped with the lingual groove near the middle surface; the hidden line of the mandibular molar is often close to the surface. The mid-developing sulcus overlaps and passes over the edge ridge to reach the adjacent surface, but there is also a cheek tongue that overlaps with the cheek lingual groove. The rupture of the premolar is often in the near and far direction.
Superficial occlusion often has no obvious symptoms. When it is deep, it is sensitive to cold and heat stimuli, or discomfort when occluded. Deep occlusion has reached the depth of dentin, and there are many symptoms of chronic pulpitis. Sometimes it can also Acute attack, and severe pain in spotting chewing. If the above symptoms are not found and the teeth have deep cavities or deep periodontal pockets, the allergic points on the tooth surface should not be considered. Possibility, generally can be checked with a sharp probe, such as the crack is not obvious, can be coated with iodine, so that the infiltration into the cracking and dyeing to show it clearly, sometimes the probe placed in the crack pressure or force to move, there may be Pain, along the cracks, visible cracks have reached the deep layer of dentin, the cotton swab is placed on the tip of the suspected tooth, and the patient is bitten. If there is a brief tear-like pain, the tooth may have cracked.
Examine
Incision of the crack
The crack of the tooth surface is consistent with the developmental groove and extends beyond the edge. The crack can be deeply stained by the iodine or the fine shadow of the tooth in the tooth. The same tooth of the same name often occurs symmetrically.
Diagnosis
Diagnosis of the diagnosis of cracked teeth
diagnosis
Diagnosis can be made based on medical history, clinical manifestations, and examination.
Differential diagnosis
It can be differentiated from other oral lesions and differentiated from toothache.
Toothache is one of the common symptoms. Toothache can occur in teeth or diseases around the teeth, such as common caries, gums, tooth knuckles, tooth bites, bone groove wind, acute and chronic pulpitis, acute and chronic apical periodontitis, etc. When you are sick, you will have different degrees of toothache.
