The bridge is an important part of the fixed partial denture missing tooth morphology and function. The designs of the bridge directly affect the repair effects and oral health. The bridge should have the following conditions:
1. Able to restore form and function of the missing teeth.
2. The role of self-cleaning, to meet the oral health requirements.
3. Have sufficient mechanical strength, chemical stability and good Histocompatibility.
4. Beautiful and comfortable.
In the bridge design should consider the following questions:
1. The occlusal surface of the bridge: First occlusal morphology better, sharp clear pit and fissure ridge, is conducive to chew. Second, the size of the occlusal surface than dental equipment normal teeth small, in order to reduce the occlusal force.
2. Gingival surface of the bridge: one to keep clean; second, good-looking; the Mihashi abutment height smooth to prevent inflammation.
3. The axial plane of the bridge: In addition to the resume form, to meet the aesthetic requirements, but also pay attention to food row overflow, to restore the correct shape protrusion.
4. Bridge's strength: the strength of the bridge refers to the bending strength of the bridge. To occur when the bridge to withstand the occlusal deflection, abutments will produce the response of the flexor moment, when the stress is Dental orthodontic tooth more than 60% greater than the retention force of the retainer when the flexor moment, make the retention of cortical from the abutment.
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