Recommended
More Related Content
What's hot
What's hot (20)
Similar to Die materials and die systems
Similar to Die materials and die systems (20)
Recently uploaded
Recently uploaded (20)
Die materials and die systems
- 5. Glossary of prosthodontics term 9
- 6. • Dimensional accuracy • Color contrast • Resistance to abrasion, good strength, smooth surface • Non injurious to health by touch or inhalation • Reproduce fine details • Economical • Compatible with all impression materials, wax. • Easy to use Ref- Rosensteil, Contemporary Fixed Prosthodontics, Third Edition
- 7. • Exact reproduction • No bubbles or voids can be accepted • The remaining unprepared tooth structure immediately cervical to the finish line should be easily discernible on the die. • Adequate access to the margin is imperative. Ref - Rosensteil, Contemporary Fixed Prosthodontics, Third Edition
- 10. Phillips, Science of dental materials, Anussavice, 11th edition
- 11. Type IV high strength Type V high strength, high expansion W/P ratio 0.22 – 0.24 0.18 – 0.22 Abrasion resistance Less More 1 hr Compressive strength 5000 psi 7000 psi Setting expansion 0.1% 0.1 – 0.3% Phillips, Science of dental materials, Anussavice, 11th edition
- 12. Phillips, Science of dental materials, Anussavice, 11th edition
- 13. Phillips, Science of dental materials, Anussavice, 11th edition
- 15. Rosensteil, Contemporary Fixed Prosthodontics, Third Edition
- 16. S Mahalaxmi, Materials used in dentistry
- 17. Phillips, Science of dental materials, Anussavice, 11th edition
- 19. Copper plated dies Silver plated dies Compatible impression material Impression compound Rubber based impression materials Cathode Impression material Impression material Anode Pure copper Silver Electrolyte Copper sulphate Silver cyanide Phillips, Science of dental materials, Anussavice, 11th edition
- 24. Rosensteil, Contemporary Fixed Prosthodontics, Third Edition
- 28. Advantages Disadvantages Easy to fabricate and remove Expensive Chairside time is reduced Sometimes can adhere to impression Reusable Good reproduction details Biocompatible Elastic in nature
- 44. Impression is examined and poured twice in Type IV or V stone The first pour in the area of the preparation(s) only
- 45. Which when set, is trimmed into a die with a handle of sufficient length, similar to a tooth root A second pour is then made of the entire arch.
- 46. The complete arch cast (second pour) is mounted on an articulator. The wax pattern is started on the initial pour (the die) and is then transferred to the articulated cast for refinement of axial contours and occlusal anatomy. When completed, this pattern is returned to the die so the margins can be readapted immediately before investing.
- 47. Advantages Disadvantages Simple Difficult to transfer complex or fragile wax patterns from cast to die Accurate Can be used only with elastomeric impression materials Minimum trimming required Seating the pattern on the master cast may be problematic The gingival tissue and other landmarks are intact
- 49. Marking desired location of pins
- 50. light indicates the location of the drill. Hold the cast firmly and depress the lever; this activates the drill,
- 51. Debris removed Coating of pins with cyanoacrylate
- 52. Cyanoacrylate used for cemenation of pins Separating media is applied
- 53. Sleeves placed over the pins Utility wax applied to join all pins
- 54. Second pouring is done
- 55. With a single-pour technique, the cast is formed in the usual way.
- 56. The cast is trimmed to horseshoe shape which fits in special tray Di-Lok tray is filled with second mix and cast is seated
- 57. Dies are sectioned by sawing three fourths through the stone and are separated The tray is dismantled
- 58. Trimmed dies Assembled cast ready for articulating
- 61. Trimmed impression on alignment fixture Clear plate placed over it
- 62. Marking location for dowel pin placement on clear plate, followed by drilling holes. Inserting dowels in the baseplate
- 63. The impression is poured with dental stone Dental stone is placed around dowel pins
- 64. The alignment fixture replaced over poured impression
- 65. The set cast is removed from the baseplate with gentle tapping Cast is sectioned
- 66. Definitive cast trimmed with DVA model system
- 67. Section of impression not required is removed Secure the impression on to the impression tray Use mounting putty in order to isolate the impression Cut the mounting putty linearly to establish the height of the crown of the tooth
- 69. Base plates with model mounted on articulator using dental plaster
- 71. Original cast Ready to be duplicated Duplication of master cast
- 72. Pour with type IV stone Duplicated cast Cutting each tooth Mark the shape of the cone
- 73. Shaping the carrot Proper bur shape Redefine the carrot shape Compare different carrot shapes
- 74. Replace tooth in silicone die Master dies carrots
- 75. Master dies with sticky wax Ready to be duplicated
- 76. Set of original and duplicated dies
- 77. Glazing the stone dies Pouring the alveolar base with type IV Carrots in place
- 81. Pouring the refractory dies Thermo treatment of refractory dies
- 82. Model with refractory dies in place
Editor's Notes
- The material must be dimensionally accurate and be should be strong and resistant to abrasion. . It should reproduce surface detail accurately. In addition, it must be compatible with the impression material also should be compatible with the separating agent that will be used so that the wax pattern does not stick. It should be available in a color that contrasts with the wax used so that the preparation margin can be seen. It should be easily wettable by the wax. It should be easily sectionable and easy to trim with the routinely available equipment.
- It must reproduce the prepared tooth exactly. 2. All surfaces must be accurately duplicated, and no bubbles or voids can be accepted. 3. The remaining unprepared tooth structure immediately cervical to the finish line should be easily discernible on the die, ideally with 0.5 to 1 mm visible (enough must be present to help the technician establish the correct cervical contour of the restoration) (Fig. 17-4). 4. Adequate access to the margin is imperative.
- epoxy, acrylic, stryrene
- HECE THEY ARE DIMENSIONALLY UNSTABLE.Polymerization shrinkage can be reduced to a larger extent by using centrifugal or automixing machine. Water preventd polymerization of resin. Very viscous when poured hence porosity
- The areas to be plated are first coated
- Time required – 12-15 hrs. Current cu- 15ma, Ag- 5 ma
- Because of the low surface energies, silicone impression materials are difficult to electroplate evenly.
- Which can lead to distortion of the pattern.
- (Eg: Premabond) , (Eg: Die Prep die hardener)
- , no need of special equipment . because the second pour of many impression materials is slightly larger than the first; therefore, it may be necessary to relieve the stone slightly to seat the pattern before occlusal evaluation.
- After dismantling the indentations are used as marker for die cutting
- Dental ventures of america
- Set cast is removed from baseplate and trimmed
- Using polyvinyl siloxane
- Using diamond disc