FINISHING AND CEMENTATION

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INDIAN DENTAL ACADEMY
Leader in continuing dental education
www.indiandentalacademy.com

www.indiandentalacademy.com
Contents
Introduction
Procedures
Abrasives
Zones of the casting
Cementation
Ideal requirements
Types
Conclusion
References...
The unpolished surface is relatively
rough, and a series of finishing
procedures are needed to produce a
highly polished s...
Cast metal restorations needs a series of
finishing procedures before try in and
cementation.

1.
2.
3.
4.
5.

Preliminary...
ABRASIVES AND POLISHING MATERIALS

Abrasion : It is the smoothening of
rough surface before preparing it for
polishing. Th...
COMMON ABRASIVES USED

1. Diamond: chips are bound to a metal

shape by ceramic bond or
electroplating.hardest of all abra...
2. Silicon carbide: basic material for
carborundom. It is sintered or pressed with
a binder into grinding wheels or discs....
3. Emery: it is a mixture of aluminium oxide
and iron oxide.Hard and black natural mineral
can be used on gold and porcela...
4. Garnet: several minerals having similar
properties.used for grinding plastics and metal
alloys.
5. Sand paper: form of ...
6. Aluminium oxide: common abrasive used in
dentistry in the form discs and strips.
It is also impregnated into rubber whe...
www.indiandentalacademy.com
Zone-1 Internal margins:
Objective: To minimize any dissolution of the
luting agent, a 1mm wide band of metal
must be obta...
Here we should inspect the internal portion for
small nodules or bubbles and should be
removed with a hand piece using rou...
Zone-2 Internal
surface:
Objective: is that no
contact should exist
between the disc and
the internal surface of
the casti...
Nodules should be
removed with a round
bur and carefully seated
on the die.
Force should not be
applied as any nodule
pres...
In the areas of the nodule, deliberate
removing of slightly greater amount of
alloy is recommended and should be
removed i...
Marking agents
Several agents are commercially
available to facilitate identifications seating
interference between the ca...
Zone-3 The sprue:
Objective; Is to establish proper coronal
morphology and function.
A corborundum separating disk is used...
www.indiandentalacademy.com
Zone-4 Proximal
contacts
Objective: is to adjusted
so that they will be in
correct when evaluated
in the mouth.
Proximal c...
Articulating strips between adjacent castings
or between the castings and the adjacent
tooth is helpful, as it allows the ...
Connectors
The connectors require
special attention when
fixed partial denture is
finished
Periodontal health is
compromis...
Rotary instruments
such as rubber
wheels, which
allows access to the
cervical margin are
used so that they do
not jeopardi...
Zone-5 Occlusal
surface
Objective is to re-establish
Occlusal contacts in static and
dynamic relationship to the
opposing ...
The adjustments are
done with flame
shaped finishing
burs.The entire
ridge or cusp should
be redeveloped
rather than grind...
Zone-6 Axial walls

Objective: The axial walls
should be smoothly
contoured and polished so
that the patient can carry out...
Zone-7- External
margins
Objective: for the
restorations longevity.
Cavo-surface margins
should be finished
directly on th...
A fine grit stone is used to remove casting
roughness, followed by soft rubber wheel and
finally by rouge or a brush, duri...
Once the laboratory procedures are completed the
restoration should be evaluated in the patient’s
mouth
before final finis...
Proximal contacts
Proximal contacts should be like those of natural
teeth
Use of floss is a convenient method to compare
t...
EXCESSIVE
TIGHTNESS.

1. Metal restorations
Adjustments are made with
rubber wheel. The satin
finish produced helps to
ide...
2.porcelain
restorations
If high proximal
contact in unglazed
porcelain is easily
adjusted with cylindrical
mounted stone....
Deficiency
Usually corrected by soldering.
Armamentarium:
Soldering tweezers
Gold solder
Paste flux
Bunsen burner
Antiflux...
1.
2.
3.
4.

Roughening the area with disk
Adding antiflux- granite
Roughened surface is painted with flux
Then the castin...
5. As the solder heats up it starts to fuse
and rapidly spread. It should be tipped
to help the solder flow in the desired...
Porcelain restorations
Deficient porcelain contact requires
additional fixing, it is at bisque stage.
If restoration has b...
Margin integrity
The completed
restoration should go
into its place without
binding and the best
adaptation should be at
i...
www.indiandentalacademy.com
Stability
The restoration should be checked for
stability. It should not rock or rotate, any
degree of instability is like...
Occlusion
The occlusion contact with the
opposing teeth is carefully
checked.any undesirable
eccentric contacts as well as...
Ceramic restorations
Ceramic restorations need certain additional
steps during evaluation to satisfy esthetic,
biologic an...
Contour
The contours of the gingival third is verified
Excessive bulk may be associated with
periodontal disease
When adju...
If at all grinding both is
absolutely necessary, the
direction of grinding is
parallel to the metalceramic junction.
The i...
The negative space
should be evaluated
(incisal embrasures)
The absence of
embrasures draws
attention to the
prosthesis
Wh...
Cementation
Cement: Binding agent used as a substance to
make objects to adhere to each other, or
something serving to fir...
Cementation- The process of attaching
parts by means of cement or attaching a
restoration to natural teeth by means of
cem...
The ideal luting material should be:
Bio- compatible with the tissues
Adhere to tooth surface and restoration either
chemi...
Be cariostatic
Be insoluble in the dilute organic acids
Resist water sorption
Be available in sufficient range of shades
A...
It should have sufficiently low film thickness, so
that the restoration may seat fully.
Should have radio-opacity similar ...
They can be classified according to the material
from which they are formed and more generally,
as active and passive.

ww...
Active luting materials
They are bonded both to tooth and restoration
make the restoration and tooth synergistic and
there...
Passive luting materials
They merely fill the gap between the indirect
restoration and tooth, with no chemical
adhesion at...
PASSIVE LUTING MATERIALS
Zinc phosphate cement:
Oldest of the currently available luting materials
Powder- liquid material...
Setting time can be lengthened by mixing on a
chilled glass slab and working time can be
prolonged by adding small increme...
Zinc-polycarboxylate
Fore runner to glass ionomer cements
Introduced by SMITH in 1968, showed true
adhesive attachment by ...
Clean –up is difficult as it will stick to the mucosa
and should be removed as soon as possible after
placement.
They are ...
Glass ionomer cements
The first glass ionomer cements were developed in
1978
These cements contain anion- leach able fluor...
These materials also release fluoride. The value
of this fluoride release in cariostatic is
questionable.
These cements ad...
Resin modified glass ionomer cements
These materials were developed to overcome some
of the short comings of traditional g...
Advantages over Conventional Glass
Ionomers are:
Improved bio-compatibility
Better fluoride release
Improved adhesion to t...
Active luting agents
Resin based luting materials
These cements bond to the tooth by the cure of
dentin – bonding agent. T...
Bonding is usually achieved with organophosphates, HEMA or 4-META(4-methacryl
ethyl trimellitic anhydride)

www.indiandent...
Their physical properties include=
Excellent compressive and tensile strength and
fracture toughness
Low solubility in ora...
CHOICE OF LUTING AGENT
Zinc – phosphate

1. Cast restorations
2. Normal conservatively prepared tooth

www.indiandentalaca...
Zinc polycarboxylate cement

1. Recommended on retentive preparations with
minimal pulp irritation.
Eg: children with larg...
Glass ionomer cement
Popular for luting cast restorations

www.indiandentalacademy.com
Resin modified glass ionomer luting
agents
Most popular because low solubility and low
micro leakage and reduced post
ceme...
Adhesive resin
Material of choice with all ceramic
restorations.

www.indiandentalacademy.com
Cementation with zinc phosphate
The field must be dry
Isolated with cotton rolls
Protection of pulp by application of
varn...
When the consistency is right,load the
cement on to the restoration.
Tell the patient to put force to the
Occlusal surface...
Cementation with
polycarboxylate
Isolate the quadrant
Blot dry the tooth
Dispense proper powder-liquid ratio
Spatulation s...
Cementation with glass
ionomer
Clean and dry the tooth
The preparation can be dried with
pumice to increase retention.
Pow...
Resin cements
For metal restorations
Air abrade the the inside of the crown,rinse it
and dry it.
Dentin activator is appli...
Ceramic restorations
Crown is is silaned by applying the silane
agent onto the internal surface of the crown.
The prepared...
Conclusion
When a restoration is tried in the mouth
the proximal contacts,margin
integrity,and occlusion must be verified....
No matter what type of cement is used
for cementation,proper moisture control
is essential .
Cement should be protected fr...
References
Contemporary Fixed ProsthodonticsRosenstiel
Fundamentals Of Fixed ProsthodonticsShilling burg
Trends In Indirec...
Thank you
www.indiandentalacademy.com
Leader in continuing dental education

www.indiandentalacademy.com
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Finishing and cementation /certified fixed orthodontic courses by Indian dental academy

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Finishing and cementation /certified fixed orthodontic courses by Indian dental academy

  1. 1. FINISHING AND CEMENTATION www.indiandentalacademy.com
  2. 2. INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com www.indiandentalacademy.com
  3. 3. Contents Introduction Procedures Abrasives Zones of the casting Cementation Ideal requirements Types Conclusion References www.indiandentalacademy.com
  4. 4. The unpolished surface is relatively rough, and a series of finishing procedures are needed to produce a highly polished surface to limit the accumulation and retention of plaque and facilitate maintenance the health the supporting periodontal tissues. www.indiandentalacademy.com
  5. 5. Cast metal restorations needs a series of finishing procedures before try in and cementation. 1. 2. 3. 4. 5. Preliminary procedures Try in and adjustment Pre cementation polishing Cementation and Post cementation polishing. www.indiandentalacademy.com
  6. 6. ABRASIVES AND POLISHING MATERIALS Abrasion : It is the smoothening of rough surface before preparing it for polishing. The smoothening is carried out by cutting action. www.indiandentalacademy.com
  7. 7. COMMON ABRASIVES USED 1. Diamond: chips are bound to a metal shape by ceramic bond or electroplating.hardest of all abrasives used on enamel or porcelain. www.indiandentalacademy.com
  8. 8. 2. Silicon carbide: basic material for carborundom. It is sintered or pressed with a binder into grinding wheels or discs. www.indiandentalacademy.com
  9. 9. 3. Emery: it is a mixture of aluminium oxide and iron oxide.Hard and black natural mineral can be used on gold and porcelain. www.indiandentalacademy.com
  10. 10. 4. Garnet: several minerals having similar properties.used for grinding plastics and metal alloys. 5. Sand paper: form of quartz,rounded or angular in shape.they are typically bonded to Paper discs for grinding metals and plastics. www.indiandentalacademy.com
  11. 11. 6. Aluminium oxide: common abrasive used in dentistry in the form discs and strips. It is also impregnated into rubber wheels and points. Used to adjust enamel or finish metal alloys and ceramic materials www.indiandentalacademy.com
  12. 12. www.indiandentalacademy.com
  13. 13. Zone-1 Internal margins: Objective: To minimize any dissolution of the luting agent, a 1mm wide band of metal must be obtained that is closely adapted to the tooth surface. www.indiandentalacademy.com
  14. 14. Here we should inspect the internal portion for small nodules or bubbles and should be removed with a hand piece using round bur,but care should be taken to avoid damage to the margin and annoying remakes. www.indiandentalacademy.com
  15. 15. Zone-2 Internal surface: Objective: is that no contact should exist between the disc and the internal surface of the casting. It should be examined for the nodules. www.indiandentalacademy.com
  16. 16. Nodules should be removed with a round bur and carefully seated on the die. Force should not be applied as any nodule present may scratch the die and this will result in a restoration with poor margins and poor prognosis. www.indiandentalacademy.com
  17. 17. In the areas of the nodule, deliberate removing of slightly greater amount of alloy is recommended and should be removed in one single step. www.indiandentalacademy.com
  18. 18. Marking agents Several agents are commercially available to facilitate identifications seating interference between the casting and die. 1.Water soluble dies eg;ligna mark. 2.Solvent based dies eg;accufilm 3.Powdered sprays eg;occludent 4.A suspension of rouge in chloroform. www.indiandentalacademy.com
  19. 19. Zone-3 The sprue: Objective; Is to establish proper coronal morphology and function. A corborundum separating disk is used to cut the sprue Cutting should be done circumferentially Excess in the area of the sprue attachment is removed with the disk, and the area is refined with stones and sandpaper disks www.indiandentalacademy.com
  20. 20. www.indiandentalacademy.com
  21. 21. Zone-4 Proximal contacts Objective: is to adjusted so that they will be in correct when evaluated in the mouth. Proximal contacts on the stone cast can be achieved by careful scraping of the adjacent teeth with a blade. www.indiandentalacademy.com
  22. 22. Articulating strips between adjacent castings or between the castings and the adjacent tooth is helpful, as it allows the areas where binding contact occurs to be adjusted through grinding. www.indiandentalacademy.com
  23. 23. Connectors The connectors require special attention when fixed partial denture is finished Periodontal health is compromised if they are not properly contoured and finished. Parabolic configuration www.indiandentalacademy.com
  24. 24. Rotary instruments such as rubber wheels, which allows access to the cervical margin are used so that they do not jeopardize the margins www.indiandentalacademy.com
  25. 25. Zone-5 Occlusal surface Objective is to re-establish Occlusal contacts in static and dynamic relationship to the opposing arch. Occlusal contacts are checked with Mylar articulating strips. Occlusal prematurities are a result of excessive heavy contact on the wax pattern as the wax is subject to elastic recovery. www.indiandentalacademy.com
  26. 26. The adjustments are done with flame shaped finishing burs.The entire ridge or cusp should be redeveloped rather than grinding only the point of interference. After refinement of the Occlusal contacts ,they should be altered with extensive polishing. www.indiandentalacademy.com
  27. 27. Zone-6 Axial walls Objective: The axial walls should be smoothly contoured and polished so that the patient can carry out plaque control. Surface defects are removed by grinding with abrasive particles Polishing should be carried out by using the abrasives in a sequence. The finer abrasive should be used last because the coarser grits will remove material www.indiandentalacademy.com efficiently
  28. 28. Zone-7- External margins Objective: for the restorations longevity. Cavo-surface margins should be finished directly on the tooth. Those parts that cannot be finished on the tooth should be finished on the disc The edges of the margin should not be distorted www.indiandentalacademy.com
  29. 29. A fine grit stone is used to remove casting roughness, followed by soft rubber wheel and finally by rouge or a brush, during all these procedures, the casting should be supported by the finger. www.indiandentalacademy.com
  30. 30. Once the laboratory procedures are completed the restoration should be evaluated in the patient’s mouth before final finishing and cementation •It should be evaluated for the following: 1.Proximal contacts 2.Margin integrity 3.Stability 4.Internal fit 5.External contour 6.Occlusion 7.Surface finish www.indiandentalacademy.com
  31. 31. Proximal contacts Proximal contacts should be like those of natural teeth Use of floss is a convenient method to compare the contacts If the floss does not pass, the contact is too tight Ideal contact should allow for positional stability of the abutments and adjacent teeth as well as easy maintenance of the supporting structures www.indiandentalacademy.com
  32. 32. EXCESSIVE TIGHTNESS. 1. Metal restorations Adjustments are made with rubber wheel. The satin finish produced helps to identify where binding occurs because a shiny spot will appear where adjustment is necessary. www.indiandentalacademy.com
  33. 33. 2.porcelain restorations If high proximal contact in unglazed porcelain is easily adjusted with cylindrical mounted stone. Area identified by red pencil. If adjustment of glazed porcelain is needed, it can be polished with diamond impregnated silicone points or diamond polishing paste www.indiandentalacademy.com
  34. 34. Deficiency Usually corrected by soldering. Armamentarium: Soldering tweezers Gold solder Paste flux Bunsen burner Antiflux and polishing armamentarium www.indiandentalacademy.com
  35. 35. 1. 2. 3. 4. Roughening the area with disk Adding antiflux- granite Roughened surface is painted with flux Then the casting is held on the bunsen flame at the height of the reduction portion of the flame www.indiandentalacademy.com
  36. 36. 5. As the solder heats up it starts to fuse and rapidly spread. It should be tipped to help the solder flow in the desired direction. 6. Proximal contact is then readjusted. www.indiandentalacademy.com
  37. 37. Porcelain restorations Deficient porcelain contact requires additional fixing, it is at bisque stage. If restoration has been completely finished, add on or convection porcelain can be used www.indiandentalacademy.com
  38. 38. Margin integrity The completed restoration should go into its place without binding and the best adaptation should be at its margins. A sharp explorer moved from restoration to tooth and from tooth to restoration can be evaluated for marginal adaptation. www.indiandentalacademy.com
  39. 39. www.indiandentalacademy.com
  40. 40. Stability The restoration should be checked for stability. It should not rock or rotate, any degree of instability is likely to cause failure during function. www.indiandentalacademy.com
  41. 41. Occlusion The occlusion contact with the opposing teeth is carefully checked.any undesirable eccentric contacts as well as centric interferences must be identified. Use of two different colored ribbon tapes or articulating paper is used for excursive movements and centric contacts. Ant interferes are then corrected with diamond or white stone www.indiandentalacademy.com
  42. 42. Ceramic restorations Ceramic restorations need certain additional steps during evaluation to satisfy esthetic, biologic and mechanical requirements. Contour, surface characteristics and color match. www.indiandentalacademy.com
  43. 43. Contour The contours of the gingival third is verified Excessive bulk may be associated with periodontal disease When adjustment is necessary porcelain and metal should not be grounded together. www.indiandentalacademy.com
  44. 44. If at all grinding both is absolutely necessary, the direction of grinding is parallel to the metalceramic junction. The incisal edge should be checked for proper position and shape This is the key for good esthetics and function. www.indiandentalacademy.com
  45. 45. The negative space should be evaluated (incisal embrasures) The absence of embrasures draws attention to the prosthesis When viewed from the incisal inter proximal embrasures should be as narrow and deep as possible www.indiandentalacademy.com
  46. 46. Cementation Cement: Binding agent used as a substance to make objects to adhere to each other, or something serving to firmly unite. GPT-8 Luting agent: Material that on hardening will fill a space or bind adjacent objects. GPT-8 www.indiandentalacademy.com
  47. 47. Cementation- The process of attaching parts by means of cement or attaching a restoration to natural teeth by means of cement.GPT-7. Luting materials play a central role in indirect dentistry by aiding the retention of restorations and in the prevention of leakage at their margins. www.indiandentalacademy.com
  48. 48. The ideal luting material should be: Bio- compatible with the tissues Adhere to tooth surface and restoration either chemically, mechanically or both. Prevent leakage by producing a good marginal seal Have sufficient mechanical properties to resist forces transmitted to the lute through the restoration that is it should have high tensile and compressive strength, high fracture toughness and fatigue strength and a modulus of elasticity which is appropriate for stress absorption www.indiandentalacademy.com
  49. 49. Be cariostatic Be insoluble in the dilute organic acids Resist water sorption Be available in sufficient range of shades Achieve optimal physical properties as quickly as possible Allow easy removal of excess and clean- up www.indiandentalacademy.com
  50. 50. It should have sufficiently low film thickness, so that the restoration may seat fully. Should have radio-opacity similar to or greater than dentine Additionally the luting cement should be technique insensitive www.indiandentalacademy.com
  51. 51. They can be classified according to the material from which they are formed and more generally, as active and passive. www.indiandentalacademy.com
  52. 52. Active luting materials They are bonded both to tooth and restoration make the restoration and tooth synergistic and there by play a role in the retention of the restoration,as well as sealing its margins and filling the space between restoration and tooth. www.indiandentalacademy.com
  53. 53. Passive luting materials They merely fill the gap between the indirect restoration and tooth, with no chemical adhesion at the restorative or lute and or tooth or lute interface. www.indiandentalacademy.com
  54. 54. PASSIVE LUTING MATERIALS Zinc phosphate cement: Oldest of the currently available luting materials Powder- liquid material has zinc oxide as the main constituent of the powder and liquid is an aqueous solution of phosphoric acid. Zinc oxide powder react with phosphoric acid to form an insoluble phosphate www.indiandentalacademy.com
  55. 55. Setting time can be lengthened by mixing on a chilled glass slab and working time can be prolonged by adding small increments of powder to the liquid PH of freshly mixed cement is between 1.6 – 3.6. Clean – up is relatively simple, as the setting cement reaches a rubbery stage and can be peeled off the restoration. Compressive and tensile strengths are adequate but the solubility of the set material is high in solutions of lower ph. Another major disadvantage is the lack of adhesion to the tooth surface. www.indiandentalacademy.com
  56. 56. Zinc-polycarboxylate Fore runner to glass ionomer cements Introduced by SMITH in 1968, showed true adhesive attachment by molecular bonding to tooth structure. Based on the reaction of zinc oxide and polyacrylic acid to form zinc polyacrylate www.indiandentalacademy.com
  57. 57. Clean –up is difficult as it will stick to the mucosa and should be removed as soon as possible after placement. They are as strong as zinc phosphate with higher tensile strength, however, they are more soluble than zinc phosphate and may absorb water. www.indiandentalacademy.com
  58. 58. Glass ionomer cements The first glass ionomer cements were developed in 1978 These cements contain anion- leach able fluoroalumino-silicate glass which reacts with a water soluble polymeric acid The outer layer of glass particles are decomposed leading to release of Ca+,Al+ and F- ions.thus the set cement is therefore a core of unreacted glass particles sheathed by a siliceous hydro gel bounded together by the reaction products. www.indiandentalacademy.com
  59. 59. These materials also release fluoride. The value of this fluoride release in cariostatic is questionable. These cements adhere to enamel and dentin and contribute to the retention of the restoration. 2030% higher retention than zinc phosphate or zinc polycarboxylate cement. However these cements have been reported to cause inflammatory response in pulpal tissue under deep restorations They have superior compressive strength but their tensile strength is low and fracture toughness is also low www.indiandentalacademy.com
  60. 60. Resin modified glass ionomer cements These materials were developed to overcome some of the short comings of traditional glass ionomer cements In addition to components of glass ionomer they contain a monomer such as 2 hydroxy-ethyl methacrylate (HEMA) or BIS-GMA. www.indiandentalacademy.com
  61. 61. Advantages over Conventional Glass Ionomers are: Improved bio-compatibility Better fluoride release Improved adhesion to tooth and Improved physical properties, specially tensile strength Clean- up is easy as it goes through a rubbery phase.eg: Fujiplus,Fuji-cem and rely-X www.indiandentalacademy.com
  62. 62. Active luting agents Resin based luting materials These cements bond to the tooth by the cure of dentin – bonding agent. These materials may also be bonded to a ceramic surface which has been rendered micro-mechanically retentive by treating with acids such as hydrofloric acid, while bonding to metal surfaces may be achieved by oxidising ortin plating gold surfaces www.indiandentalacademy.com
  63. 63. Bonding is usually achieved with organophosphates, HEMA or 4-META(4-methacryl ethyl trimellitic anhydride) www.indiandentalacademy.com
  64. 64. Their physical properties include= Excellent compressive and tensile strength and fracture toughness Low solubility in oral fluids Low potential for microleackage when bonded to a tooth by an intermediary bonding systems. High bio-compatibility when used with dentin bonding systems www.indiandentalacademy.com
  65. 65. CHOICE OF LUTING AGENT Zinc – phosphate 1. Cast restorations 2. Normal conservatively prepared tooth www.indiandentalacademy.com
  66. 66. Zinc polycarboxylate cement 1. Recommended on retentive preparations with minimal pulp irritation. Eg: children with large pulp chambers. www.indiandentalacademy.com
  67. 67. Glass ionomer cement Popular for luting cast restorations www.indiandentalacademy.com
  68. 68. Resin modified glass ionomer luting agents Most popular because low solubility and low micro leakage and reduced post cementation sensitivity. www.indiandentalacademy.com
  69. 69. Adhesive resin Material of choice with all ceramic restorations. www.indiandentalacademy.com
  70. 70. Cementation with zinc phosphate The field must be dry Isolated with cotton rolls Protection of pulp by application of varnish|dentin bonding agent Mixing done by adding increments Mixing done on a wide area www.indiandentalacademy.com
  71. 71. When the consistency is right,load the cement on to the restoration. Tell the patient to put force to the Occlusal surface by closing on a plastic wafer. Once the cement has set remove the excess with explorer. www.indiandentalacademy.com
  72. 72. Cementation with polycarboxylate Isolate the quadrant Blot dry the tooth Dispense proper powder-liquid ratio Spatulation should be complete in 30 secs Cement is coated on the inside of the casting and seated on the tooth. www.indiandentalacademy.com
  73. 73. Cementation with glass ionomer Clean and dry the tooth The preparation can be dried with pumice to increase retention. Powder liquid ratio is 3.4:1 Mixing should be fast,applied on to the restoration and seat the crown. Excess cement removed after it has become brittle www.indiandentalacademy.com
  74. 74. Resin cements For metal restorations Air abrade the the inside of the crown,rinse it and dry it. Dentin activator is appliued for 10 secs Base catalyst ratio is 4:1,to this 2 scoops of powder is added and stirred gently for 5 secs to produce a creamy mixture Apply the cement onto the restoration and placed over the tooth.10 mins is the setting time. www.indiandentalacademy.com
  75. 75. Ceramic restorations Crown is is silaned by applying the silane agent onto the internal surface of the crown. The prepared tooth is cleaned with pumice washed and dried. Etch the enamel,rinse for 30 secs Apply primer to dentin and polymerize for 30 secs Dispense equal amount of base and catalyst mix for 20 secs,apply thin layer onto the internal surface of the crown and seat the crown Light cure at marginal areas from facial,lingual and Occlusal directions. www.indiandentalacademy.com
  76. 76. Conclusion When a restoration is tried in the mouth the proximal contacts,margin integrity,and occlusion must be verified. With metal ceramic restorations the contour in the cervical third is critical for the maintenance of health of supporting structures. Proper shaping of gingival and incisal embrasures will improve the esthetics. www.indiandentalacademy.com
  77. 77. No matter what type of cement is used for cementation,proper moisture control is essential . Cement should be protected from moisture during initial set,and removal of excess from the gingival sulcus is critical for continued periodontal health. Active luting, in which the material bonds the restoration to the tooth is the most desirable feature, which make the resinbonded the material of choice but they are technique sensitive. www.indiandentalacademy.com
  78. 78. References Contemporary Fixed ProsthodonticsRosenstiel Fundamentals Of Fixed ProsthodonticsShilling burg Trends In Indirect Dentistry-Dental Update 2005. www.indiandentalacademy.com
  79. 79. Thank you www.indiandentalacademy.com Leader in continuing dental education www.indiandentalacademy.com

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