Fixed partial denture abutment preparation

Members may have such a concept, or subgingival three shoulder the way, are advantages and disadvantages, for anterior teeth, conventional or subgingival shoulder, where I talk about the gingival shoulder preparation depth.

Subgingival the aesthetic effect of the shoulder is very good, but if improper because the production lead to periodontal disease, destruction of health Taibuyinggai In fact dentists in China, there may be a large part on this issue did not attract enough attention.

Crowns on the abutment in three aspects: First, the crown edge position depth; two crowns of abutment shoulder suitability of adaptation, now the requirement is 0.1mm error; three crowns contour.

Of course, on gingival sulcus depth shown in the patient population will be very different from the depth varies, especially the presence of gingival or periodontal disease patients, the gingival sulcus more than 2mm depth, the vast majority of people will less than 1mm. Crowns not to damage the epithelial attachment, this can cause gingivitis. Gingival should be used about 10g of force should not be excessive oppression of the gums in order to dental equipment emphasize the clarity of the gingival margin.

Also to be noted that the prepared tooth epithelial attachment in different aspects of the dental arc of the same shoulder prepared as flat, with the arc of the cemento-enamel junction.

The only strict compliance with it to avoid destruction of epithelial attachment and lead to gum inflammation, and then gingival recession. The shape of the shoulder should be compatible with the cemento-enamel junction.

For the right shoulder, porcelain crowns requirement is not 90 degrees, it should be 135 degrees bevel concave. The experimental results show that the What type of bad breath marginal fit of metal bladed for the best. This can be seen in many books, and specialized bur can prepare to come out.