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مهندسی پزشکی::
دندانهای اباتمنت
2) 2) Morphology of the abutment teeth, related adjacent teeth, and related opponent teeth should be accurately digitized prior to designing the restoration to adjust crowns and FPDs to abutment teeth and dentitions.
In addition, because the restorations not only have to be adjusted for abutment teeth but must also harmonize with adjacent and opposing teeth, once again, the development of sophisticated CAD software of restorations was necessary.
After the abutment teeth are prepared, the mainstream work-flow for conventional metal restorations is first obtained by taking an impression followed by model production, wax up, and then casting.
When this work is performed with the aid of computer-assisted technology, abutment teeth are directly digitized inside the oral cavity instead of taking conventional impressions.
However, direct digitizing of abutment teeth in a mouth with a camera for crowns and FPDs was technically difficult because of the restricted measuring conditions in the mouth, including the presence of adjacent teeth, gingiva, and saliva, which made accurate recognition of the margin of an abutment difficult.
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