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A 24-year-old female patient complains about hard tissues defect of the 21 tooth...
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A 24-year-old female patient complains about hard tissues defect of the 21 tooth. Objectively: the 21 tooth is destroyed by 1/3 along the cutting edge, it is changed in color. X-ray picture shows that the root canal is filled to the top. It was decided to fabricate a plastic crown. Where should the crown edge be situated against the marginal gingiva?
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