Downloaded 1,116 times
Uploaded bymalek mohammed
cementation in Fixed prosthodontics
The document discusses the clinical importance and mechanisms of cementation in fixed prosthodontics, detailing various types of luting cements and their bonding mechanisms such as mechanical, molecular, and micromechanical bonding. It describes the ideal criteria for luting cements, including physical properties and biocompatibility, and provides guidelines for cement selection based on clinical performance and specific requirements. Additionally, it includes best practices for the cementation process of different materials, highlighting considerations for effective bonding and handling techniques.
More Related Content
Similar to cementation in Fixed prosthodontics
cementation in Fixed prosthodontics
- 1. Cementation in Fixed Prosthodontics BY: ABDEL RAHMEN M. ABDEL HAMEED
- 2. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 3. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 4.
- 5. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 6. Bonding Mechanisms Mechanical bonding MolecularAdhesion Micromechanical bonding
- 7. Bonding Mechanisms Mechanical bonding MolecularAdhesion Micromechanical bonding
- 8.
- 9. Bonding Mechanisms Mechanical bonding MolecularAdhesion Micromechanical bonding
- 10. Molecular Adhesion Molecularadhesion include the use of chemical bonding between tow materials. Such as chemical bonding, occur between the COOH group of the zinc polycarboxylate and glass ionomer (GIC) cements and the tooth structure. Silane coupling agent is another example for molecular bonding mechanism
- 11. Bonding Mechanisms Mechanical bonding MolecularAdhesion Micromechanical bonding
- 12. Micromechanical bonding Thismechanism use the microstructure of the tooth structure to provide retention.
- 13. The bondstrength of micromechanical bonding mechanism sometimes exceed the cohesive bond of enamel. Ceramics can be etched with hydrophloric acid and silanated, before using resin cement with it. Metals also can be prepared by electrolytic etching, chemical etching or sandblasting before using the resin cement with it.
- 14. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 15. Classification of lutingcements According to the duration in clinical performance definitive Provisional According to reaction mechanism acid base reaction polymerization reaction
- 16. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 17. Ideal criteria ofluting cements Physical properties Biocompatibility Sealing and Anticariogenic Activity Adhesion
- 18. Mechanical properties Fatigue strength Fracture toughness Elastic Modulus Wear
- 19. Handling andradiopoacity Ease of use long working time short setting time Radiopoacity Esthetic
- 20. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 21. Cement selection Zinc phosphatecement Zinc polycarboxylate cement Glass Ionomer cements Zinc oxide eugenol cements: Resin cements Resin modified glass ionomer
- 22. Cement selection Zinc phosphatecement Zinc polycarboxylate cement Glass Ionomer cements Zinc oxide eugenol cements: Resin cements Resin modified glass ionomer
- 23. Zinc phosphate cement Compressive strength (st): 96-110 Mpa Tensile st: 9.3 Mpa PH during cementation: 3.5 Film thickness: 10-20 um
- 24. Cement selection Zinc phosphatecement Zinc polycarboxylate cement Glass Ionomer cements Zinc oxide eugenol cements: Resin cements Resin modified glass ionomer
- 25. Zinc polycarboxylate cement Compressive st: 50-80 Mpa Tensile St: 7-10 Mpa Bond strength to tooth structure: 9 Mpa for Enamel and 3.3 Mpa for Dentin. PH during cementation: 4.8 Film thickness: 13-20 um
- 26. Cement selection Zinc phosphatecement Zinc polycarboxylate cement Glass Ionomer cements Zinc oxide eugenol cements: Resin cements Resin modified glass ionomer
- 27. Glass Ionomer cements Compressive st: 127 Mpa Tensile st: 8Mpa Bond st to tooth structure: 9 Mpa for enamel and 3 Mpa for dentin Film thickness: 9.5 – 16 um
- 28. advantages fluoride Bond to tooth structure good esthetic properties less soluble than zinc phosphate cement GIC is 65% more retentive than zinc phosphate cement.
- 29. disadvantages highacidity sensitive to both moisture and dehydration . GIC is translucent
- 30. Cement selection Zinc phosphatecement Zinc polycarboxylate cement Glass Ionomer cements Zinc oxide eugenol cements: Resin cements Resin modified glass ionomer
- 31. Zinc oxide eugenolcements:
- 32. Cement selection Zinc phosphatecement Zinc polycarboxylate cement Glass Ionomer cements Zinc oxide eugenol cements Resin cements Resin modified glass ionomer
- 33. Resin cements Compressivest: 200-250 Mpa Tensile st: 40-50Mpa Film thickness: 25 um Solubility in water: Insoluble
- 34. Resin cementsare composed of organic matrix such as BISGMA or UDMA and inorganic fillers Advantages high mechanical properties good seal abilities good bond strength no solubility excellent esthetic
- 35. disadvantages polymerizationshrinkage pulpal irritation difficulty of removing the hardening excess cements.
- 36. Classification of resincement According to the adhesive scheme Self-etching Self-adhesive Total etching According to the mode of polymerization Chemical cure Light cure Dual cure
- 37. Total etching resincements use three step bonding technique Acid etching Bonding Cement application
- 38. Self-etching The bondingagent is applied directly to the tooth structure and cured, and then the resin cement is applied.
- 39. Self-adhesive resin cements The adhesive resin cement can be applied directly to the tooth structure. It provide the best retention with dentin.
- 40. Cement selection Zinc phosphatecement Zinc polycarboxylate cement Glass Ionomer cements Zinc oxide eugenol cements Resin cements Resin modified glass ionomer
- 41. Resin modified glassionomer Compressive st: 150 Mpa Tensile st: 25-35 Mpa Film thickness: 20 um Resin modified glass ionomer combine the strength and the insolubility advantages of the resin cements and the fluoride release of the GIC
- 42. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 43. Cementation Cementation with Zinc phosphatecement Cementation with Zinc polycarboxylate cement Cementation with glass ionomer cements Cementation with resin cements
- 44. Cementation Cementation with Zinc phosphatecement Cementation with Zinc polycarboxylate cement Cementation with glass ionomer cements Cementation with resin cements
- 45. Cementation with Zincphosphate cement tips for cementation : Complete isolation is necessary during the whole process. Vital teeth ---> two layers of varnish or bonding agent should be applied first. Non-vital teeth ---> No need for varnish. Liquid/Powder Proportions: six drop of liquid for each crown. Do not dispense the liquid until just before mixing.
- 46. Divide thepowder in small increments each of 3 mm thickness. Mixing time is 10-20 seconds for each increment. Mix in circular motion. Mix over wide area of the glass slab introduce the powder slowly in to the liquid check the consistency Bruch the cement inside the fitting surface
- 47. grooves, pins,and inlays ---> fill them before seating the restoration If necessary use the retraction cord in the sulcus. seat the restoration ask the patient to close over a plastic wafer Leave the cement to fully set then remove the excess.
- 48. Cementation Cementation with Zinc phosphatecement Cementation with Zinc polycarboxylate cement Cementation with glass ionomer cements Cementation with resin cements
- 49. Cementation with Zinc polycarboxylatecement Tips for cementation: Isolation wash the restoration and clean it with alcohol sandblast the fitting surface coat the outer surface with petroleum Powder/Liquid Proportion : according to manufactures instructions working time: 30 seconds
- 50. brush thecement inside the restoration, seat the restoration, ask the patient to bite over aplastic wafer setting time: 3 minutes Remove the excess either before or after the cement become rubbery.
- 51. Cementation Cementation with Zinc phosphatecement Cementation with Zinc polycarboxylate cement Cementation with glass ionomer cements Cementation with resin cements
- 52. Cementation with glassionomer cements tips for cementation isolation coat outside the restoration with petroleum Clean the tooth with brush and pumice. don’t use acid etch for this step Don not use varnish Powder / Liquid proportions : one scoop of powder/ two drops of liquid working time: 60 seconds setting time : 3 minutes
- 53. mix rapidlyuntil the mix become creamy capsule form is now available in the market Brush the restoration with the cement; seat the restoration, ask the patient to occlude over the plastic wafer. Wait until the cement become brittle but before complete setting and remove the excess cement. Coat the crown margin with varnish or petroleum
- 54. Cementation Cementation with Zinc phosphatecement Cementation with Zinc polycarboxylate cement Cementation with glass ionomer cements Cementation with resin cements
- 55. Cementation with resincements Tooth preparation : isolation ( rubber dam is a must) clean the tooth with pumice and brush, clean and dry if total etching system is used : apply the acid etch ( phosphoric acid 37% ) 30 seconds for enamel and 10 seconds for dentin wash and dry ( don’t dissipate dentin) apply the bond with brush, wait for 1 minute, cure for 20 seconds
- 56. if self-etchingsystem is used apply the self-etching bond , wait for 1 minutes and cure If total etching system will be used the tooth not need any preparation more than cleaning with brush.
- 57. treatment ofthe fitting surface of the restoration : The fitting surface of the restoration is treated before receiving the resin cement by two ways Roughening the surface to increase the surface area and create a microspores In the restoration surface Increase the wettability of the restoration surface with silane coupling agent. Roughnining of the fitting surface can be achieved by various techniques depending on the type of the restoration.
- 58. Content Clinical importance Bonding mechanisms Classificationof luting cements Ideal criteria of luting cements Cement selection Cementation Special consideration:
- 59. Special consideration: Cementation ofceramic restorations Bonding of resin to zirconia: Cementation of posts Cementation of partial coverage restoration Cementation of the gold alloy:
- 60. Special consideration: Cementation ofceramic restorations Bonding of resin to zirconia: Cementation of posts Cementation of partial coverage restoration Cementation of the gold alloy:
- 61. Cementation of ceramicrestorations tooth preparation restoration preparation differ according to the type of the ceramic material: Feld spathic porcelain ( HF + S ) Lucite reinforced ceramics (IPS Empress): ( sand + S ) Lithium disilicate (IPS Emax( ( Sand + HF + S ) Zirconia Lava ( Silica ) Cercon ( Silica + MDP ) other types such as IPS Emax zircad and Ketana (Phosphoric acid monomer containing primer)
- 62. Special consideration: Cementation ofceramic restorations Bonding of resin to zirconia: Cementation of posts Cementation of partial coverage restoration Cementation of the gold alloy:
- 63. Bonding of resinto zirconia: sandblasting and silanation of zirconia Plasma spraying Porcelain particles infusion
- 64. Special consideration: Cementation ofceramic restorations Bonding of resin to zirconia: Cementation of posts Cementation of partial coverage restoration Cementation of the gold alloy:
- 65. Cementation of posts Metallic posts Fiber posts
- 66. Special consideration: Cementation ofceramic restorations Bonding of resin to zirconia: Cementation of posts Cementation of partial coverage restoration Cementation of the gold alloy:
- 67. Cementation of partialcoverage restoration
- 68. Special consideration: Cementation ofceramic restorations Bonding of resin to zirconia: Cementation of posts Cementation of partial coverage restoration Cementation of the gold alloy:
- 69. Cementation of thegold alloy: