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Periodontics III > 7. Guided Tissue Regeneration > Flashcards

7. Guided Tissue Regeneration Flashcards

1
Q

What is a Grade I Cervical Enamel Projection?

A

The enamel projection extends from the CEJ of the tooth toward the furcation entrance.

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2
Q

What is a Grade II Cervical Enamel Projection?

A
  • The enamel projection approaches the entrance to the furcation.
  • It does NOT enter the furcation
  • No horizontal component is present
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3
Q

What is a Grade III Cervical Enamel Projection?

A

The enamel projection extends horizontally INTO the furcation

  • Can lead to bone loss
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4
Q

Where are Enamel Pearls located?

A

Apical to the CEJ

  • Localized masses of enamel
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5
Q

How do enamel pearls form?

A
  • Localized failure of Hertwig’s epithelial root sheet to separate from the dentin
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6
Q

What is the enamel pearl lined with?

A

REE

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7
Q

With enamel pearls what can be seen close to the normally formed adjacent cementum?

A

Epithelial Cell Rests (ECR)

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8
Q

What is the “healing” of the tooth’s supporting tissues, including: alveolar bone, PDL, and cementum

A

Regeneration

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9
Q

What is the healing of a wound by tissue that does not fully restore the architecture or function of the part?

A

Repair

  • Compromised outcome
  • This is what occurs after SRP, where the long JE forms but it isnt CT attachment
    • Good but not perfect
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10
Q

What is the clinical restoration of bone tissue in a treated periodontal defect, not addressing the presence or absence of periodontal regeneration or a new attachment?

A

Bone Fill

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11
Q

What is New Attachment?

A
  • Union of a CT or Epithelium with a root surface that has been deprived of its original attachment apparatus
  • Getting tissue back that is lost because of disease (i.e. perio ds)
  • Not considered a type of repair
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12
Q

What is Reattachment?

A
  • To attach again such as the reunion of epithelial and CT with root surfaces and bone that occurs after an incision or injury
  • There is no disease process, attachment was removed because of surgery, and this is putting it back.
  • Ex: following flap surgery, the curetted root surface may be repopulated by:
    1. ​​Epithelial cells
    2. Gingival CT cells
    3. Bone cells
    4. PDL cells
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13
Q

How fast does epithelium migrate?

A

0.5-1mm / day

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14
Q

How fast does the PDL migrate?

A

5x slower than epithelium

0.1 mm/day

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15
Q

How fast does the bone heal/migrate?

A

100x slower than epithelium

0.05 mm/day

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16
Q

What is the goal of Guided Tissue Regeneration?

A
  • Placement of the physical barrier, which prevents the epithelium and gingival CT from contacting the root surface during healing.
  • At the same time the membrane allows cells from the PDL to repopulate the previously periodontitis involved root surface
17
Q

What osseous defect is considered well contained?

A

3 wall infrabony defect

18
Q

What walls are always present in an Interproximal osseous crater?

A

Buccal and Lingual walls

  • There is a dip in the interproximal contour between the plates
19
Q

What kind of osseous defect is an interproximal crater?

A

2 wall defect

  • Not all 2 wall defects are interproximal craters
20
Q

What is the treatment for a one-wall angular defect?

A

Osseous Resective Surgery

If shallow, not for a deep defect

21
Q

What is the treatment for a two-wall defect?

A

Either method (resective or regenerative)

  • Regenerative if it is containable
22
Q

What is the treatment for a three-wall defect?

A

Regeneration

Especially narrow defects

23
Q

What are the indications for Guided Tissue Regeneration (GTR)?

A

Done around teeth

  • Deep vertical bone defects (2 and 3 walls, circumferential)
  • Furcation defects
  • Root coverage/gingival recession or dehiscence
24
Q

What are the indications of Guided Bone Regeneration (GBR)?

A

Done in an edentulous area for implant purposes

  • Bone ridge defects - ridge augmentation
  • Extraction sockets - site preservation, immediatly after ext
  • Defects associated with dental implants
    • Immediate implant placement in a fresh ext site
    • Repair of bone dehiscence or fenestration
    • Repair of crestal bone loss about implants, peri-implantitis
25
Q

What bone graft material is from the pts own tissue?

A

Autografts

26
Q

What bone graft material is from another human/ bone bank?

A

Allograft

27
Q

What bone graft material is from another species (bovine)?

A

Xenografts

28
Q

What bone graft material is a synthetic graft?

A

Alloplasts

29
Q

In GTR, membrane alone or combination of a graft and membrane, present with better clinical results compared to …

A

Open flap debridement alone

30
Q

The type of membrane used does not seem to affect the clinical outcome in what defects?

A

Vertical (intrabony) defects

not furcation defects

Periodontics III (6 decks)

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