1. Number of lack of teeth
(1) The fixed bridge is most suitable for repairing one or two missing teeth, that is, two bridge -based teeth are suitable for one or two lack of teeth. The fixed bridge can generally repair 1-4 teeth in the cutting area, and 1-2 teeth in the rear teeth are missing.
(2) If there are more than two teeth, it is a lack of interval, that is, there is an increase in intermediate base teeth.
(3) When selecting a fixed bridge repair, you must consider the ability of the lack of teeth and the base teeth at both ends of the lack of teeth, otherwise it will cause the fixed bridge repair failure.
2. Lost of the teeth
(1) The lack of teeth in any part of the dental roster is as long as the number of teeth is missing. The base tooth conditions meet the requirements, and the fixed dental dental repair can be selected.
(2) For patients with lacking from the back of the rear tooth, if the bridge is fixed with a single -ended bridge, the bridge body is stagnant, and the leverage has a large leverage, which can easily cause damage to the tissue of the basal tooth.
(3) If the second grinding tooth travel is missing, the jaw is the mucosal support type to pick the dental dental, because the occlusion force is significantly reduced than the normal natural teeth, the lack of teeth can be the second pair of teeth and the first grinding teeth as the base. The turbulence of the base tooth is good, and a single -end fixed bridge can be repaired.
3. Conditions of base teeth
(1) The clinical crown of the crown as a fixed bridge tooth should be appropriate. For example, the crown has the defect of the dental tissue, or the shape of the crown is abnormal. As long as it does not affect the solid position preparation of the solid body, and can meet the requirements of the solid position, it can also be considered as a base tooth. The crown has a large area. If it can be repaired by pile nuclear, it can still be selected as the base. If the clinical crown of the base tooth is short, the solid force measures should be taken to enhance the solid body.
(2) The roots of the teeth should grow up and stable. The support of multiple teeth is best, and there should be no pathological looseness.
(3) The pulp is the best with vibrant pulp. If the pulp has a lesion, it should be treated thoroughly, and after a long period of observation, it is confirmed that those who will not affect the effect after the repair can be used as the base tooth. After filling the root tube of the dead marrow to make the teeth brittle, the strength of the tooth root should be considered when choosing a base tooth.
(4) The health of the periodontal tissue of the periodontal tissue can support the power of the bridge passed by the solid body to the base tooth. Therefore, the requirements for the tissue of the basal tooth period are; gums have no sexual inflammation, periodontal membranes have no inflammation, and peculiar peripherals have no disease; alveolar bone structure is normal, and the alveolar projection does not absorb or absorb 1/ 3, and absorb stomach levels. If individual teeth are lacking, the basal teeth are loosened to varying degrees due to periodontal disease. According to the principle of orthopedic treatment of periodontal disease, the design of a polyetic fixed bridge can be considered.
(5) The position of the base tooth requires that the axial position of the base tooth is basically normal, without excessive tilting or twisting misplacement, and does not affect the preparation of the solid body and the common way between the base teeth.
4. Anti -bite relationship
(1) The occlusion relationship in the lack of teeth is basically normal, that is, the alveolar（in the lack of the tooth area has a normal gingival distance from the jaw tooth surface. There is no extension of the jaw tooth, and the neighboring teeth are not inclined.
(2) If the lack of teeth is too long, it will cause disorders, such as the tilt of the neighboring teeth, the elongation of the jaw teeth to form a tooth lock, causing limited mandibular movement to restrict the mandibular movement. Generally, it is not appropriate to use fixed bridges Essence The fixed bridge repair can still be considered to restore the elongated teeth and tilt teeth to the normal position.
(3) The occlusion area is too tight, and the alveolar （mucosa in the lack of the tooth area is too small to the jaw tooth facial. Because of the solid body and bridge body, the connecting body does not have enough thickness and strength to bear the chewing force. Generally, it is not appropriate to use fixed dentures.
5. Littoos in the dental area
(1) Wound healing of the dental region is generally 3 months after tooth extraction. After the tooth extraction, the poultry is completely combined. If you must repair immediately for special reasons, you can advance the fixed bridge base tooth system, and use resin to temporarily fix the bridge to repair the lack of teeth. After the wound is completely healed, the permanent fixed bridge repair is repaired. If the tooth extraction of the outlet has not healed, the alveolar cymbal absorption is not stable, and the fixed bridge will be repaired immediately. After repair, it is easy to form a gap between the gingival end of the bridge and the mucous membrane, which will affect the self -cleaning effect and aesthetics.
(2) The alveolar scallion in the dental region should not be absorbed too much, especially the front tooth area. If the alveolar is absorbed too much, the fixed bridge is made, and the shape of the bridge is difficult to shape, which will affect the aesthetics. The alveolar is absorbed by too much posterior tooth area and can be designed to design a sanitary bridge. In short, if you absorb too much alveolar in the dental area, you need to consider it carefully when you choose a fixed bridge to repair it. If necessary, a special shape is shaped, such as the bridge surface or cutting edge to the mucosal distance of the lack of the dental area, the gingival color of the tooth of the bridge can be used to shorten the length of the bridge body through the visual difference and coordinate with the neighbor's neck.
6. Age
(1) If the age is too small, the clinical crown is short, the pulp cavity is large, and the pulp angle is high. Sometimes the tip of the root is not completely formed.
(2) If the age is too large, the periodontal tissue is shrinking significantly and the tooth is loose. At this time, the compensation function of the periodontal tissue is reduced, and a fixed bridge should be repaired.
(3) The appropriate age of fixed bridge restoration is 20 to 60 years. But it should also depend on the specific situation of the patient. For example, elderly patients have good whole body and oral conditions. In addition to the lack of individual teeth, the remaining teeth are healthy and stable. At this time, a fixed bridge can be repaired.
7. Oral hygiene
Patients with poor oral hygiene, deposition of tartar, and plaque gathering can easily cause dental dental caries and periodontal disease, leading to destruction of periodontal tissue. Therefore, such patients must use fixed bridges to repair them, and they must be cleaned up to the tooth, and instructs patients to keep their mouth clean and hygienic. Otherwise, it is not appropriate to make fixed teeth.
8. Remaining tooth: The stability of the dental.