week 13

Question 1

furcation etiology

Answer 1

Primary etiology is bacterial plaque with the inflammatory consequences of its long-term presence
• Extent of attachment loss required to produce a furcal defect varies depending
on local anatomic factors: root trunk length, root morphology, CEP/enamel pearl

Question 2

1) __% of furcations have an entrance of ____mm or less

2) __% are ____ mm or less

Answer 2

1) 81% of furcations have an entrance of 1 mm or less

2) 58% are 0.75 mm or less

Question 3

Root trunk length

Answer 3

distance from the CEJ to the entrance of the furcation

• The shorter the root trunk, the less attachment needs to be lost before the furcation is involved

Question 4

Root length

Answer 4

teeth with long root trunks and short roots might have lost a majority of support by the time the furcation becomes involved
• Teeth with long roots and short-moderate root trunk lengths are more readily treated because sufficient
attachment remains

Question 5

CEP: occur on

Answer 5

CEP: occur on 8.6%-28.6% of molars, mostly MN/MX 2nd molars

Question 6

classifcaion of CEP

Answer 6

• Grade I: enamel projection extends from the CEJ toward the furcation entrance
• Grade II: enamel projection approaches the entrance to the furcation, does not enter the furcation, and therefore no horizontal component is present
• Grade III: enamel projection extends horizontally into the furcation

Question 7

classification of furcation involvment

Answer 7

Grade I: early stage, primarily affects soft tissue, pocket is suprabony
• Grade II: can affect one or more furcations of the same tooth, cul-de-sac lesion with definite horizontal component, furcation “arrows” might be visible radiographically
• Grade III: bone is no longer attached to dome of furcation which might be filled with soft tissue, radiolucency will be visible at furcation
• Grade IV: interdental bone is destroyed and soft tissues have receded, furcation opening is clinically visible

Question 8

surgical therarpy of furcations options

Answer 8

1) Osseous Resection: goal is to make furcation cleansable via osteoplasty and ostectomy
2) Regeneration: suitable for deep two-walled or three-walled defects
3) extraction for class 3 and 4

Question 9

root hemisection and root resection (root amp) most common where?!?!

Answer 9

hemisection= MN molar

root amp= DB root of MX 1 molar

Question 10

Root form

Answer 10

M root on MN 1/2 molars and MB root on MX 1 molar curve to the distal causing more dental procedures risks (VRF or perforations)

Question 11

Anatomy of furcations. Txt how?

Answer 11

Bifurcated ridges, concavity in some or accessory canals

-txt via odontoplasty

Question 12

Inter radicular dimension

Answer 12

Closely approximated roots inhibit good cleaning… want them wider