Crown lengthening- Review Flashcards
Only category in which gingivectomy alone is successful:
unstable low crest
Only category in which gingivectomy alone is successful:
Unstable low crest
List the objectives to crown lengthening:
- to allow for restoration of tooth (caries removal, clamp placement)
- increasing crown length for retention or restoration
- restoration of tooth in harmony with supracrestal attached tissue (biologic width)
- esthetics via alteration of the gingival labial profile
Functional indications for crown lengthening include: (4)
- subgingival restorative margins
- tooth fracture
- endo performations
- cervical root resorption
Esthetic indications of crown lengthening: (1)
- excessive gingival display
- gingival overgrowth (meds)
- altered passive eruption
List the components of the supracrestal attached tissue (biologic width):
CT attachment (1.07mm) + JE (0.97mm) = 2.04mm
T/F: Epithelium gets its blood supply and nutrients from the underlying connective tissue
True
What is the most consistent dimension of the suprarenal attachment?
Most variable dimension?
Consistent= CT attachment 1.07 mm
Variable = JE 0.97 mm
Vertical axial wall that surrounds the tooth that is desired everytime a crown is fabricated to help resist fracture and/or crown displacement:
Ferrule
T/F: You need atleast 1mm of ferrule (natural tooth structure) circumferentially beyond the core
False- you need atleast 2 mm of ferule
What bur is used for osteoPLASTY:
Large round bur
What bur is used for ostECTOMY:
End cutting bur
Before beginning a crown lengthening procedure, tooth should ideally be:
caries free & provisionalized
T/F: Before begining the crown lengthening procedure, the tooth should ideally be caries free AND provisonalized
True
Witha crown lenghtening procedure, ostectomy is generally only required on the _____
Facial
At end of crown lengthening procedure, a well-fitting temporary crown should be placed back on the tooth to prevent:
migration
When should the final restoration be placed following crown lengthening procedure?
minimum of 6 weeks to 6 months
T/F: If in doubt, following a crown lengthening procedure, a good rule of thumb is to wait 1-6 months before final restoration placement
False: 3-6 months
(6 weeks to 6 months)
CEJ should be approximately ____ mm from osseous crest
2mm
The _____ should be approximately 2mm from osseous crest
CEJ
The gingival margin should be ____ coronal to the CEJ (covering anatomic crown)
0.5-2mm
The _____ should be 0.5-2mm ______to the CEJ (covering the anatomic crown)
Gingival margin; coronal
As tooth breaks through gingiva, it erupts until it meets its antagonist and occludes & then ceases or slows, this is referred to as:
active eruption
T/F: Eruption potential continues throughout life (think supraeruption of tooth that has no opposing tooth)
True
- Shift of tooth itself (no gingival movement)
- as tooth breaks through gingiva, it erupts until it meets antagonist and occludes, then eruption ceases/slows
-eruption POTENTIAL continues throughout life (think supraeruption with a tooth lacking an antagonist)
Active eruption