BASEPLATES.pptx baseplates in dentristry

base plates in dentristry

1. Good morning !

2. BASEPLATES MADE BY: AISHWARYA KULKARNI Roll no. 3 1 st year MDS Prosthodontics

3. CONTENTS Introduction Requirements Baseplate materials Methods of construction Autopolymerising resin baseplates Shellac baseplates Thermoplastic resin baseplates Wax baseplates Heat cured compression moulded baseplates Allergy Recent advances References

4. INTRODUCTION What are baseplates ? Baseplates (record base, temporary base, trial base) A temporary form representing the base of a denture. The baseplate is used for making maxillomandibular (jaw) relation records, arranging artificial teeth, or trial placement in the mouth CHAPTER 5 , BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

5. REQUIREMENTS FOR BASEPLATES Elder (1955) gave the following requirements for baseplates: S hould adapt to the basal seat area as the finished denture base. H ave the same border form as the finished denture base. B e sufficiently rigid to resist biting forces. Dimensionally stable. P ossible to construct baseplates quickly, easily, and inexpensively. Baseplates should not have undesirable colour. Permit use as base for setting teeth. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

6. Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER

7. Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER

8. Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER

9. BASEPLATE MATERIALS Autopolymerising resins Shellac baseplate material Thermoplastic resins Heat curing resins Baseplate wax Metal CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

10. METHODS OF CONSTRUCTION CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

11. AUTOPOLYMERIZING RESIN BASEPLATES Require an activator and a catalyst for polymerization and no external heat. Readily available at a reasonable cost. Set hard and rigid or soft and flexible according to the formulation. Colour is satisfactory. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

12. Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER

13. SPRINKLE ON METHOD Consists of coating the cast with tinfoil substitute, sifting polymer on it , and saturating it with liquid monomer . Alternate applications of powder and liquid continue until the baseplate is of the desired thickness. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

14. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Undercuts blocked out with baseplate wax Maxillary cast Mandibular cast

15. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Cast is coated with separating medium Maxillary cast Mandibular cast

16. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Soft curing autopolymerising resin placed in lesser undercuts

17. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Soft cure autopolymerising powder sifted into the cast and saturated with monomer as alternate procedure

18. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Soft curing auto polymerising resin should not be allowed to flow out of undercuts and into border of casts Autopolymerising resin powder sifted onto the cast before it is saturated with monomer

19. Eye dropper used to control amount of monomer applied CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

20. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Autopolymerising resin built up to thickness of approx. 2mm and ready to be cured cured record base on the cast before removal

21. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Curing the material under plaster bowl significantly reduces the porosity

22. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

23. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

24. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

25. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

26. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

27. FINGER ADAPTED METHOD Mix the powder and liquid together until the mixture is the consistency of dough, form it into a roll or sheet, and adapt it to the cast with finger pressure. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

28. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

29. Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER

30. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

31. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

32. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

33. SHELLAC METHOD Shellac, derived from the resinous exudate of a scale insect, is the base of this baseplate material (Greener, Hareonrt , and Lautenselllager , 1972). When heated,shellac baseplates are adaptable to a cast; on cooling, they remain sufficiently stable for use as satisfactory baseplates CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

34. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

35. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

36. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

37. Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER

38. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

39. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

40. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

41. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

42. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

43. Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER

44. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

45. Stabilized shellac baseplates Since shellac baseplates tend to warp, investigators such as Fletcher (1951), Boos (1956), Freese (1956), Ja - mieson (1956), Kapur and Yurkstas (1957), Hall (1958), Bodine (1964), and Malson (1964) have used methods and materials for stabilizing them. Secondary Materials used as liners : Z inc oxide- eugenol impression paste E lastomeric impression material A utopolymerizing resin CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

46. Zinc Oxide E ugenol CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

47. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

48. Elastomeric impression material CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

49. Autopolymerising resin CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

50. Problem area Problem Cause Solution Baseplate unable to be removed from cast Cast not treated with talc before adaptation Shellac baseplate stuck to cast Undercuts not blocked Wet cast in slurry water / apply talc Do not over heat Do not adapt baseplate into undercuts Completed baseplate too flexible Completed baseplate too thick Wire reinforcement not used Layer of stabilizing material too thick Use wire reinforcement Apply finger pressure when adapting baseplate Void in stabilizing material Insufficient impression material or inadequate pressure Use enough impression material Apply even pressure Completed baseplate unable to fit Baseplate warped by heat Baseplate warped by stabilizing material Readapt by warming Remake if warped by stabilizing material CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

51. THERMOPLASTIC RESIN BASEPLATES AND VACUUM-ADAPTED RESIN BASEPLATES This is a quick and easy method wherein we vacuum mould a sheet of thermoplastic resin to a cast . Terry and Wahlberg (1966) have reported obtaining a more intimate adaptation of baseplate material by vacuum adaptation than by manual adaptation. Alfred et al. (1968) have described a method of vacuum molding resin baseplates. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

52. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

53. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

54. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

55. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

56. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

57. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

58. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

59. WAX BASEPLATES Baseplates constructed of hard baseplate wax are satisfactory ( Boucher, llickev . and Zarb . 1975 ). C onstruction of a wax baseplate is easy and rapid, and thinning to gain more space to set teeth is relatively simple. The disadvantage of this type of baseplate is primarily its lack of dimensional stability. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

60. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

61. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

62. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

63. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

64. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

65. HEAT-CURED COMPRESSION-MOLDED RESIN BASEPLATES Generally, Heat-cured resin baseplates constructed by conventional compression-moulding methods serve as record bases and subsequently become denture bases (Brewer. 1962). CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

66. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

67. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

68. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

69. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

70. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

71. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW

72. ALLERGY The unreacted monomer may leach out into the saliva which actually causes the cytotoxic effects in the oral cavity . The greater the quantity of the unreacted monomer, higher will be the deleterious effects . Effects:  irritate the lung tissues,  burning mouth and/or soreness, gastrointestinal tract and may cause CNS effects that is, sleepiness, dizziness, headaches, and blurred vision, skin irritation Allergic effects of the residual monomer used in denture base acrylic resins Haroon Rashid , 1   Zeeshan Sheikh , 2  and  Fahim Vohra 3 Eur J Dent . 2015 Oct-Dec; 9(4): 614–619

73. RECENT ADVANCES Addition of : 1. Rubbers: increase in toughness as well as ultimate elongation in comparison with the relatively brittle resin acrylic material 2. Fibres: The stiffness of the fibres is an important characteristic for strengthening of brittle materials like denture base resins 3. Fillers: Metals in various forms such as wires, plates, and fillers have been incorporated Recent Advances and Future Perspectives for Reinforcement of Poly(methyl methacrylate) Denture Base Materials: A Literature Review Abdulrazzaq Naji Sa; Jafarzadeh Kashi Tb; Behroozibakhsh Mc *; Hajizamani Hd ; Habibzadeh S Journal of Dental Biomaterials. 2018;5(1)

74. REFERENCES CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW Recording Bases and Occlusion Rims, Harold F. Morris, DDS, MS, SHELDON WINKLER Allergic effects of the residual monomer used in denture base acrylic resins Haroon Rashid , 1   Zeeshan Sheikh , 2  and  Fahim Vohra 3 Eur J Dent . 2015 Oct-Dec; 9(4): 614–619 Recent Advances and Future Perspectives for Reinforcement of Poly(methyl methacrylate) Denture Base Materials: A Literature Review Abdulrazzaq Naji Sa; Jafarzadeh Kashi Tb; Behroozibakhsh Mc *; Hajizamani Hd ; Habibzadeh S Journal of Dental Biomaterials. 2018;5(1)

75. CHAPTER 5, BASEPLATES AND OCCLUSION RIMS, KENNETH D. RUDD and ROBERT M. MORROW THANKYOU !