Overview Of Local Contributing Factors Flashcards
What is a local contributing factor? (LCF)
Anything that influences PD health status at a particular site or sites w/ no systemic effects
-May included anatomic anomalies or iatrogenic features
Do LCFs cause periodontitis?
NO
-Accelerate the progression of the disease
T/F - LCFs can change the prognosis from favorable to unfavorable.
TRUE
T/F - Modifiable LCF may improve prognosis or tx.
TRUE
What are 4 sites associated with anatomic LCFs?
Proximal contact relation
Cervical enamel projections
Enamel pearls
Bifurcation ridges
Open contacts = ?
Food impaction
-Forceful wedging of food interproximally by occlusal forces
—Lateral food impaction = due to tongue pressure in open embrasures
What is a cervical enamel projection?
Narrow wedge-shape extension of enamel pointing toward the furcation
- 30% of mand molars
- 17% of max molars
- Buccal surfaces
- 2nd molar>1st molar
Grade I CEP?
Distinct change in CEJ pointing toward the furcation
Grade II CEP?
Cervical enamel projection approaches, but does not enter, the furcation
Grade III CEP?
Cervical enamel projection extends into the furcation
T/F - CEP are plaque retentive, predispose to furcation involvement.
TRUE
Tx of CEPs?
No tx If Grade 1 or 2
- No CT won’t form on enamel
- Remove carefully to avoid pulp exposure
Where are enamel pearls found?
Furcations
Frequent on 3rds
What is the intermediate bifurcation ridge?
Excess cementum on mand molars runs longitudinally b/t mesial and distal roots
- Medially or laterally placed
- Plaque and calculus removal difficult
Palatogingival grooves?
Extends from cingulum apically
Extends onto root 50% of time = attachment loss
Tx of palatogingival grooves?
Odontoplasty
Minimalize groove to reduce plaque retention
Root Trunk?
Distance of CEJ to coronal aspect of the furcation
Root trunk classifications?
A - very short root trunk
-1/3 or less of the cervical area of the root
B - Medium root trunk
—Half of the length of the root
C - Long root trunk
—furcation entrance is in cervical 2/3rds
Which is better for attachment? Short or long root trunks?
The more area for attachment, the better, however the furcation involvement in teeth w/ long root trunks is very unfavorable
T/F - Root fusion decreases the amount of attachment area
TRUE
T/F - Long contacts and minimal embrasures inhibit plaque removal
TRUE
T/F - Healthy teeth unaffected if you treat the compromised tooth, however, healthy teeth affected if the compromised tooth untreated.
TRUE
Prevalence of accessory canals?
25-50% molars
1st molar>2nd molar
Always tx non-vital teeth with RCT very first
How to tx cemental tears?
Debridement and regen
T/F - Overhangs promote plaque retention which equals inflammation and attachment loss.
TRUE
T/F - More attachment loss with larger overhangs.
TRUE
Do overhangs cause periodontitis?
NO
-They can contribute, but they do not cause periodontitis
Impingement of a margin = ??
Inflammation, bleeding, discomfort
What is the biologic width?
2 mm
~1 mm - junctional epi
~1 mm - CT
What are factitial injuries?
Pts pick at gingival tissue
