3d Issue _VERIFIED_ Crack Free 6
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Some of the most common defects in acrylic are: damage, missing teeth, cracks, discoloration and stains caused by foods or drink, and colour shift, all of which can be avoided. When the defect is severe or cosmetic, some patients choose to get their new dentures re-colored.
The most common cause of enamel breakdown is wear. This can be on the back teeth, due to bruxing (bruxing causes the enamel to be worn away in the biting surface even when one is not actively grinding their teeth). However, the enamel on the cuspids and molars can also be damaged from occlusal stresses, occlusal trauma, bruxing, non-erupted third molars, or a baby bite during the first 6 years of life. After that, the wear pattern will change with how active a person is. If there is little or no contact with natural teeth, the risk of enamel breakdown is much lower. If one is grinding against natural teeth on their daily life and not wearing a full mouth guard (or using only a partial mouth guard on the sides), there will be an increased risk of enamel wear. Moreover, if one has a tight set of teeth and doesn’t allow for space between them (e.g. clenching one’s jaw shut), there will be an even higher risk of enamel wear.
Fabrication of a dental prosthesis involves many processes. The substrate is cut from sheet metal, and finishes are applied or mechanical processes incorporated. Once finished, the finished tooth model is scanned into a CAD/CAM system that will generate a 3D model of the prosthesis.
In welding the location of the grain where the crack emerges from the body must be identified. This is usually achieved by shining a light through the cast onto a light-sensitive recording film. The grain that appears in the image is assumed to be the crack.
A crack is always accompanied by crestal bone loss, and the amount of this loss can be quantified by measuring the height of the crestal bone from the top of the ridge to the top of the defect. For this reason, crestal bone height measurements are included in most diagnostic assessments of periodontal disease. d2c66b5586