Crown Lengthening Procedures Flashcards Preview

Perio Comps > Crown Lengthening Procedures > Flashcards

Flashcards in Crown Lengthening Procedures Deck (12)
Loading flashcards...
1
Q

functional crown lengthening is performed when?

A

to expose sound tooth structure for restoration

2
Q

esthetic crown lengthening in the esthetic zone is performed when?

A

for excessive gingival display or gingival asymmetry

3
Q

when is gingivectomy indicated?

A

if there is gingival excess and adequate keratinized tissues and the alveolar crest is at least 2 mm apical to the CEJ or at least 3 mm apical to restorative margin

4
Q

what is indicated if resection of the gingiva would remove too much keratinized tissue resulting in a mucogingival problem?

A

flap (usually with apical positioning will be required)

5
Q

if the expected crown margin will be less than 3 mm from the alveolar crest, what will be required?

A

crown lengthening with osseous surgery

6
Q

what is the general rule during crown lengthening?

A

3 mm must be provided between sound tooth structure and the crest of the bone

2 mm for biologic width (about 1 mm for JE and about 1 mm for the supracrestal CT) and 1 mm to allow for preparation of a subgingival finishing line

7
Q

to determine the level of the crest of bone prior to a crown lengthening procedure, the area should be sounded through what?

A

transgingival probing (bone sounding)

8
Q

bone sounding

A

a serial (step probing) penetrating through anesthetized soft tissue in order to determine the topography of the alveolar process

9
Q

flaps with osseous surgery are almost always indicated for what?

A

crown lengthening

10
Q

majority of the time, crown lengthening by gingivectomy or lasers without ostectomy (removal of supporting bone) will result in what?

A

soft tissue rebound over time and crown margins encroaching on the biologic width

11
Q

crown lengthening procedures such as flaps and distal wedges are limited by what?

A

anatomical considerations such as ramus, external oblique line, the pterygomandibular raphe, lingual nerve and greater palatine artery

12
Q

what is the minimum healing time following crown lengthening prior to finalizing preparation and taking final impressions?

A

6 weeks