How to taking impression for deep margin

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How to taking impression for deep margin
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? article? A. HYGIENIC PHASE B. ACCURATE
MARGIN C. LOCATION OF GINGIVAL MARGIN D. CERVICAL
CONTOUR E. PREPARATION, IMPRESSION, AND
TEMPORARY COVERAGE
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A. HYGIENIC PHASE
It can be predicted that a certain amount of
gingival recession will take place after scaling
and home care for patients who have marginal
gingivitis or inflammation around deepened
crevices. If crowns are prepared and placed in
this condition the gingiva will be further
traumatized
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A. HYGIENIC PHASE
In some cases the patient will be encouraged to
brush well, but the swollen gingiva will continue
to recede after crown placement and the final
result will be the exposure of the cervical
margins Final crown preparation should not
completed until the gingiva have returned to
normal, but temporary crowns and bridges may be
placed using conservative preparation.
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A. HYGIENIC PHASE
marginal gingivitis with hyperplastic swollen
margins and deepened crevice   
                        
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A. HYGIENIC PHASE
temporary crown set oral hygiene instructions
given
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A. HYGIENIC PHASE
Immediate placement of aesthetic crown
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A. HYGIENIC PHASE
after gingival recession and healing with
temporary crown in place
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A. HYGIENIC PHASE
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margin? location, biologic width
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Provisional restoration evaluation of gum
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Make another provisional restoration
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1st provisional rest. VS 2nd provisional rest.
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Evaluation about the gum condition
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Use the electrosurgery, finishing the margin
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3rd provisional restoration for healing
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Use indirect method for temporary crown
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Location of gingival margin

• Classical position halfway into the gingival
  crevice
• Normal crevice 1 2mm deep
• Sometimes up to 3mm may be acceptable
• Recently a shallower margin only 0.5 0.7mm
  into the crevice

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Location of gingival margin