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Flashcards in Implantology Deck (45)
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1

Where is most mechanical stress on implant? Why does this matter?

Crestal 5mm

Width more important than length to minimize stress

2

Components of Ti allow

90% Ti

6% Aluminum

4% Vanadium

3

Implant roughness

  • Unit of measure
  • Average roughness
  • Techniques to create roughness

Implant roughness

  • Sa value = Unit of measure
  • 1-2 Sa = Average roughness
  • Techniques to create roughness
    • Additive = plasma spray
    • Subtractive = Blast or Etch

4

Given same length and diameter, which has greater surface area?

Straight or Tapered wall implant

Fine pitch or Course pitch

Straight has greater surface area

Fine pitch has greater surface area (more threads)

5

Restorative distance (crestal bone to occlusal plane)

Min-Max for screw retained

Min-Max for cement retained

Does depth of implant placement affect this?

Restorative distance (crestal bone to occlusal plane)

6-12mm for screw retained

8-12mm for cement retained

Depth of implant placement: sort of matters. If subcrestal there is more room for abutment pieces, porcelain thickness. However, if bony crest to occlusal plan is >12mm than teeth will still look too long and require pink porcelain. And if less than 6mm tooth will look stubby, even if implant deeply subcrestal.

6

Implant space requirements

  • Root
  • Other implant
  • buccal/lingual plate
  • Gingival margin for good emergence profile
  • Esthetic zone buccal plate
  • Alveolar nerve
  • Mental foramen

Implant space requirements

  • 1.5mm Root
  • 3mm Other implant
  • 1mm buccal/lingual plate
  • 3mm inferior to Gingival margin for good emergence profile
  • 2mm from buccal plate in Esthetic zone
  • 2mm Alveolar nerve
  • 5mm anterior Mental foramen

7

Which bone type is mostly cortical bone?

Type 1

8

Which bone type is best for implant placement?

Type 2

9

Is magnification in Panorex increased or decreased

Increased

10

Implant success

Defined as:

Implant success

Defined as: 

  • Restorable
  • <0.2mm bone per year after 1st year of function
  • No mobility, radiolucency, symptoms

11

What temperature causes osseus thermal necrosis

47 celsius

12

Minimum diameter of keratinized tissue around implant

2mm

13

Incision design for 2nd stage

  • >5mm keratinized buccal
  • 4-5mm
  • 2-4mm

 

Incision design for 2nd stage

  • >5mm keratinized buccal = Crestal and papilla sparing
  • 4-5mm = Crestal, papilla sparing, reverse cutback
  • 2-4mm = Crestal, papilla sparing, anterolateral advancement

14

Which arch has higher failure rate for over denture?

Maxilla

15

Vertical space for ovedenture

Vertical space for ceramometal

Vertical space for hybrid

Vertical space for ovedenture = 12mm

Vertical space for ceramometal = 8mm

Vertical space for hybrid = 15mm

16

All on four and zygomatic implants can only be used with which prothesis

Hybrid

17

Indications for coronally positioned semilunar flap

18

Where is restorative emergence of zygomatic in relation to original teeth?

Palatal to palatal cusp of premolar

19

Insertion torque for immediate temporization of implant

30-35ncm

20

When can free gingival graft be placed in relation to implant placement?

Any of three times

  1. Original implant placement if non-submerged
  2. At time of stage II 
  3. Anytime after definitive restoration

21

Harvest site for free gingival graft

How to prevent neurovascular injury

Smooth area of palate in anterior to 1st molar

22

How is recepient site prepared for free gingival graft?

Split thickness so graft is secured to periosteal bed

23

Which has greater shrinkage at gingival graft site

Free gingival graft (Autograft) or Allograft (acellular dermis)

Acellular dermis.

24

Timing of subepithelial connective tissue graft

Harvest site

Subepithelial connective tissue graft

Timing: completed prior to stage II or done at implant placement if nonsubmerged

Harvested: premolar area 3mm apical to gingival margin. Split thickness leaving behind palatal epithelium

25

Palatal roll technique

Timing

Harvest site

Palatal roll technique

Timing: only at stage II

Harvest site: subepithelial adjacent palatal tissue

26

Pedicled palatal flap

Flap classification type

Timing

Random pattern flap

Periosteum/connective tissue

Timing: Done simultaneously with bone graft for large volume alveolar grafts

27

Match indication with soft tissue procedure

Epithelialized free graft (auto/allograft), subepithelial free graft, palatal roll, pedicled palatal flap

  • Deficient width of connective tissue around implant
  • Deficient thickness of connective tissue around implant
  • Metal show through gingiva
  • Large composite defect

 

 

  • Deficient width of connective tissue around implant = epithelialized graft
  • Deficient thickness of connective tissue around implant = subepithelial free graft, palatal roll
  • Metal show through gingiva subepithelial free graft, palatal roll
  • Large composite defect = pedicled palatal flap

28

What type of cells are acted on with osteoinduction

Mesenchymal stem cells

29

Allograft and xenograft

Osteoconductive, osteoinductive, or both

Osteoconductive only. Matrix for host cells

30

Describe triangle of tissue engineering

Source of cells

Signal

Scaffold