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Fixed Prosth Final > 14. Resin-bonded Fixed Dental Prostheses > Flashcards

14. Resin-bonded Fixed Dental Prostheses Flashcards

1
Q

Resin-Retained Fixed FDPs
v It consists of one or more pontics supported by thin ____ retainers placed lingually and proximally on the abutment teeth.
v It relies on ____ bonding between etched enamel and metal casting.
v It is based on the concept of v____ Dentistry

A

metal
adhesive
minimum invasive

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2
Q

Cast Perforated Resin Retained FDPs.

v Rochette in 1973 introduced this technique.
v Wing like retainers with funnel shaped perforations to provide ____.
v The restorations were bonded with heavily filled composite resin as luting medium.
v Problems
ØWeakening of the retainer by ____.
Ø____ to wear of the resin at the perforation.
ØLimited ____.

A

mechanical retention
perforation
exposure
adhesion

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3
Q

Etched Cast Resin Retained FDPs (“Maryland Bridge”)
v Thompson and Livaditis at the university of Maryland developed a technique for electrolytic etching of Ni-Cr and Cr-Co alloys.
v Advantages include:
____ is improved because the resin-to-etched metal bond is much stronger
Ø The oral surface of the cast retainer is highly ____ and resists plaque accumulation.
Ø Micromechanical bonding into the undercuts in the metal casting created by ____.

A

retention
polished
etching

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4
Q

Macroscopic Mechanical Retention (“Virginia Bridge”)
vWas developed at the Virginia University, School of Dentistry.
vIt involves a “lost salt Crystals” technique by incorporating salt crystals into the retainer patterns to produce roughness on the inner surfaces. (____ Mechanical Retention)
vThis technique permits the use of any ____.

A

macroscopic

metal ceramic alloys

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5
Q

Chemical Bonding Resin Retained FDPs (Adhesion Bridges)
v Development of adhesive systems for ____ adhesion to metal.
v It is based on the addition and modification of the cement with adhesion promoter ____, a halogenated Phosphate group in its structure, allows for better ____ to metal
v ____ has shown excellent bonds to air abraded Ni-Cr and Cr-Co alloys as well as tin plated gold and gold palladium -based alloys.

A

direct
4-META
adhesion
panavia

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6
Q

PREPARATION OF THE METAL SURFACES

Electrochemical pit corroding technique using a 3.5% solution of nitric acid, and utilizing an electric current for 5 minutes, followed by immersion in 18% Hydrochloric acid for 10 minutes -> It’s not always successful though

Later the surfaces were coated with pylorized ____ which improved the retention

In adhesion bridges, sandblasting with ____ is considered just as effective as all the other method

A

silane

aluminum oxide

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7
Q

THE ROCATEC SYSTEM
The most recent method of abrading the inner surface of the metal retainer resulted in the deposit of ____ on this surface.
With the subsequent addition of ____, this facilitated the bonding procedure

A

silica

silane

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8
Q

THE ROCATEC SYSTEM
Sand blasting with110 um Aluminium Oxide with a force of 280 megapascals at a terrific speed
This is followed by a chemical procedure with a further blast of sand mixed with ____.
The impact energy resulting from this process allows the silicon particles to actually ____ with the roughness in the metal This improves the ____ of the cement to the bridge

A

silicon dioxide
fuse
adhesion

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9
Q

Patient Assessment, Diagnosis, and Treatment Planning
l Before providing the patient with a resin bond retained prosthesis, careful and thorough assessment is important.
l This assessment should include: ____
vExamination ____ vDiagnostic casts

A

history

radiographs

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10
Q

ØThe occlusion with the opposing arch should allow sufficient space for the prosthesis after tooth preparation.
ØLoss of space through drifting may pose a problem in pontic construction
ØThe possible presence of
____ habits and ____ should be evaluated

A

parafunction

dietary habits

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11
Q

Patient Assessment, Diagnosis, and Treatment Planning
ØThe alveolar ridge in the pontic area should have a firm healthy ____.
ØThe extent of tooth preparation should be evaluated in relation to the path of ____ of the prosthesis and presence of undercuts

A

mucoperiosteum

insertion

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12
Q

ØActive periodontal disease and caries may ____ the construction of a prosthesis.
ØThe need for crown ____ should be considered.
ØAbutments should be tested for vitality, and ____ taken to assess root length and periodontal support.

A

contraindicate
lengthening
radiographs

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13
Q

Advantages

  • minimal tooth prep, minimal disturbance to pulp
  • supragingival margins
  • minimal disturbance to periodontal tissue
  • ____ quality of enamel maintained
  • anesthesia not usually required
  • easy impression making
  • provisional not usually ____
  • reduced chair time
  • reduced patient expense
  • rebonding is possible
A

protective

required

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14
Q

Disadvantages

  • uncertain ____
  • cannot be used in patients with a deep overbite
  • where enamel is thin, ____ of the abutment teeth may occur
  • they can not be used where heavily restored abutments are present
  • they can not be used where the shape of abutments may require considerable alteration
  • difficult temporization
  • sensitivity to
A

longevity
graying
nickel

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15
Q

Indications
Replacement of a single missing tooth in a relatively ____ span in an otherwise ____ dentition

Intact den??on = mouth and teeth are healthy w/ no contraindica?on

A

short

intact

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16
Q

Splinting

Indications of periodontally ____ teeth

A

compromised

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17
Q

Indications
Replacement of ____ teeth where pulps of
abutment teeth are ____

A

missing

large

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18
Q

Indications

  • as a ____ following orthodontic treatment
A

retainer

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19
Q

Indications

l Closure of median ____.

A

diastema

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20
Q

Contraindications

v Abutments are heavily ____ or ____ compromised

A

restored

endodontically

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21
Q

Contraindications
Where ____ is unfavorable.
In a patient who requires an ____ replacement in the presence of an unstable or nonexistent ____ occlusion.

A

occlusion
anterior
posterior

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22
Q

Contraindications

Compromised ____ structure, or if abutments have insufficient ____ for bonding

A

enamel

enamel

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23
Q

Contraindications
l Grossly ____ or rotated abutments.
l Presence of a ____
l Presence of a ____

A

tilted
diastema
long span

24
Q

ESSENTIALS FOR SUCCESS

l 1. ____ Selection
Most ____ thing is to make sure it’s a good case for this
type of procedure. Don’t ask the sprinter to run a marathon.
l 2, ____ Design
l 3, Flawless ____ technique

A

case
important
preparation
clinical

25
Q

OBJECTIVES OF OF PREPARATIONS FOR RESIN RETAINED FDPs

To include as much enamel as possible without impacting on :-

  1. THE ____
  2. THE ____
  3. THE ____
  4. ____ HEALTH
A

occlusion
esthetics
pulp
periodontal

26
Q

Preparation

  • in maxillary incisors reduction of the lingual mesial and distal marginal ____
  • maxillary canines may require reduction of the ____ lingual ridge
A

ridges

central

27
Q

PREPARATION

  • in mandibular anterior teeth may require slight modification of the ____ aspect to provide an irregular surface
  • only in incisor relationship needs reduction for interocclusal clearance
A 
lingual
class III
28
Q

axial reduction

  • the proximal walls should be prepared to achieve the planned optimal path of ____ and provide sufficient length, the margin terminating supragingivally at a point which still allows for the provision of a ____ embrasure space
A

insertion

cleanable

29
Q

In selected cases, shallow ____

can be a useful addition to increase retention

A

grooves

30
Q

Axial reduction
l The axial reduction should be extended ____ and lingually,
achieving an angle of taper of ____ degree, and involving ____ degrees around each abutment.
(____)
Remember this term!!

A

buccally
6-8
180
wrap around

31
Q

l Margins should be well defined with a light ____ and supragingival so that the edge of the metal framework remains at least ____ mm from the soft tissue.

l To stabilize the restoration and insure that precise seating is accomplished ____are advised in anterior teeth.

A

chamfer
1
cingulum rests

32
Q

ADDITIONAL RETENTION & RESISTANCE FORMS

1, Addition of ____ shaped occlusal Rests
2, Joining of the rests along the ____
3, The interproximal connectors should be at least ____mm high (These extensions increase the rigidity of the retainers)
4, Finish line should be a ____

A

spoon
central fossa
2
mild chamfer

33
Q

CANTILEVER RBFDPs
There has been a lot of evidence lately that, in selected cases, retention is improved when using only ____ abutment instead of two….(92% to 74%)
The reason is that the variable pressures on each tooth, both in magnitude and direction, leads to abnormal stresses and strains which causes ____ of the prosthesis

A

one

debonding

34
Q

SAYS HE STARTS GOING FAST FROM HERE ON OUT

Clinical phase I
vTooth \_\_\_\_
v Impression
vOcclusal \_\_\_\_
vTooth shade and pontic selection
A

modification

registration

35
Q

Tooth modification
l The tooth modification required to develop the appropriate path of ____ should be predicted.
l A diagnostic ____ will help with pontic design.

A

insertion

mock-up

36
Q

Tooth modification
l Careful assessment of the occlusal clearance both in the ____ position(red) and all ____(blue) should be performed prior to and during tooth modification procedures.

A

interocclusal

excursions

37
Q

Impressions
l Working impressions are usually made using an ____ impression material.
l A satisfactory impression should be free of voids
and have clearly defined and recognizable margins.

A

elastomeric

38
Q

Bite registration shade selection
l An interocclusal registration may be required if the ____ is difficult to locate on study casts.

l Tooth shade selection should be made in ____ and ____ lighting, and a prescription chart formulated

A

maximum intercuspation
artificial
natural

39
Q

l The working cast may be poured using an improved ____ or a ____ material.

A

stone

refractory

40
Q

Read slide
l The finished pattern should be checked for adequate ____ thickness, space for gingival extent of porcelain and proximal cleansability.

A

connector

41
Q

l The pattern is invested using a standard technique and cast in ____ metal alloy.
l If a refractory cast technique is used the pattern is waxed and sprued and invested ____ with the cast.

A

non-precious

together

42
Q

l The casting may be checked for shape and contour prior to the framework____

A

try-in

43
Q

clinical phase II

  • the metal framework should be checked prior to the addition of ____. to verify the acuuracy of casting and the extent of the margins the retention and stability of the framework
  • the marginal fit, occlusal contact, embrasure sapces and connector position and thickness should be examined
A

porcelain

44
Q

l Following porcelain application the metal framework should be rechecked
l Surface stains may be applied prior to ____.

A

glazing

45
Q

If an adhesive system is used, the prosthesis should be cleaned in an ____ and ____.

A

ultrasonic cleaner

sandblasted

46
Q

Bonding
l The abutment teeth are isolated using a ____.

lTeeth are polished using ____ and water, and then washed clean

A

rubber dam

pumice

47
Q

ØEtch for ____ seconds with Panavia etching agent.
ØDispense one drop of each ED Primer liquid A and liquid B into a well of the mixing dish and mix until the desired consistency is attained
ØUsing a small applicator apply the mixture to the prepared tooth surface.
ØAfter ____ second evaporate with a gentle stream of air, the surface will appear ____.

A

15-30
60
glossy

48
Q

v Apply the ____ to the internal surface of the casting and seat it.
v With a disposable ____ tip remove the excess cement.
v Apply oxyguard to the margins.
v After ____ minutes remove the oxyguard with a cotton roll and water spray.
v Remove the excess cement with an explorer.

A

cement
brush
3

49
Q

The beauty of EMAX is that it is ~____ MPa flexural strength. Zirconia is ~____ MPa
Teeth undergo tremendous amounts of force.

It’s ~____ lbs/in^2 in males and ~____ lbs/in^2.

In the front it is ~____ lbs/in^2 in both male and female.

While the EMAX is much easier to bond, it isn’t as ____ as the zirconia.

A 
400
1000
150
110
57
stronger
50
Q

LITHIUM DISILICATE— IPS eMAX
-____ to bond,
Flexural strength only 400 MPAs More ____, thus more ____

ZIRCONIA
____ bonding procedure
Flexural strength up to ____ MPAs

A

easier
translucent
esthetic

complicated
1200

51
Q

FAILURE OF RESIN BONDED FDPs
1, ____ !!!!
2, Fracture of Porcelain pontic
3, Fracture at the ____ site

A

debonding

connector

52
Q

FAILURE OF A CONVENTIONAL FDP
1, Complete ____ of abutment tooth
2, Undetected ____ especially when you have full ____
3, 22% require ____ treatment

A

fracture
caries
coverage
endodontic

53
Q

THE SURVIVAL RATE
1, ____ teeth do better than posteriors
2, ____. Teeth do better than Mand. Teeth
3, ____ abutment better than 2 abutments
4, 87% survival rate

A

anterior
max
one

54
Q

Some Do’s and Don’t’s When Considering the Treatment Plan

Present all the options ____
Do not presume the patient could not ____ the costs involved
Do not offer any ____ expectations of success
There is an obligation to offer a ____
Only offer evidenced based assessments

A

available
afford
unrealistic
referral

55
Q

3 UNIT CONVENTIONAL FPD

Disadvantages
1, ____ Preparations of virgin or minimally restored teeth
2, 20-25% chance of ultimate ____ treatment
3, Possible development of ____ in the abutment teeth
4, Overall ____ of the procedure
5, Difficulty of achieving a good ____ profile
6 Cost of remake 7, ____ visit

A 
irreversible
endodontic
decay
cost
emergence
multiple
56
Q

3 UNIT CONVENTIONAL FPD ADVANTAGES
1, Esthetics
2, Capable of directing forces along the ____ axes of the abutments.
3, Longer survival rate, (Average of ____ years)

RBFDPs have only
been tested for ____ years

A

long
15
10

57
Q

IMPLANT RETAINED CROWN

1, Involves invasive surgery with ensuing healing time.
2, Cost, multiple visits
3, Patient must meet several selection criteria
a) Inadvisable in certain ____ and pregnancies
b ) Availabilty of ____mm length and ____mm width of healthy bone
c) Must be positioned at least ____ mm from the Inferior dental canal,
____mm from periodontal ligament , and a safe distance from the adjacent teeth Must maintain a distance of ____mm from the mandibular foramen

A 
diseases
10
0.5
1
3

Fixed Prosth Final (15 decks)

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