Crown Lengthening Procedures Flashcards
functional crown lengthening is performed when?
to expose sound tooth structure for restoration
esthetic crown lengthening in the esthetic zone is performed when?
for excessive gingival display or gingival asymmetry
when is gingivectomy indicated?
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
what is indicated if resection of the gingiva would remove too much keratinized tissue resulting in a mucogingival problem?
flap (usually with apical positioning will be required)
if the expected crown margin will be less than 3 mm from the alveolar crest, what will be required?
crown lengthening with osseous surgery
what is the general rule during crown lengthening?
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
to determine the level of the crest of bone prior to a crown lengthening procedure, the area should be sounded through what?
transgingival probing (bone sounding)
bone sounding
a serial (step probing) penetrating through anesthetized soft tissue in order to determine the topography of the alveolar process
flaps with osseous surgery are almost always indicated for what?
crown lengthening
majority of the time, crown lengthening by gingivectomy or lasers without ostectomy (removal of supporting bone) will result in what?
soft tissue rebound over time and crown margins encroaching on the biologic width
crown lengthening procedures such as flaps and distal wedges are limited by what?
anatomical considerations such as ramus, external oblique line, the pterygomandibular raphe, lingual nerve and greater palatine artery
what is the minimum healing time following crown lengthening prior to finalizing preparation and taking final impressions?
6 weeks
