Clase de dureza superficial a estudiantes de odontologia de la Universidad de Costa Rica.

1. Propiedades de
superficie
Saturday, March 17, 2012

2. Propiedades de superficie
Propiedad
MASA
SUPERFICIE
Saturday, March 17, 2012

3. Saturday, March 17, 2012

4. Dureza Superficial
Saturday, March 17, 2012

5. Resistencia a indentación o
penetración superficial
Pulido Duro
Rayado Suave
Saturday, March 17, 2012

6. Indentador Deformación
plástica
Saturday, March 17, 2012

7. Tipos de Medición
Brinell Vickers
Knoop Rockwell
Saturday, March 17, 2012

8. Tipos de Medición
Brinell Vickers
Knoop Rockwell
Saturday, March 17, 2012

9. Saturday, March 17, 2012

10. Saturday, March 17, 2012

11. Brinell
123N
1.6 mm
30 segundos
Saturday, March 17, 2012

12. Saturday, March 17, 2012

13. BHN
L
pD ( D - V D2 - d2 )
2
Saturday, March 17, 2012

14. Material BHN (kg/mm2)
Oro tipo I 45
Oro tipo II 95
Oro tipo III 120
Oro tipo IV 220
40% Au-Ag-Cu 252
99% Aleación noble 165
Saturday, March 17, 2012

15. Knoop, KHN
Saturday, March 17, 2012

16. Material KHN (Kg/mm2)
Porcelana Feldespática
460
Cr-Co
391
Esmalte
343
Dentina
68
Cemento
40
Cemento Fosfato Zinc
38
Resina de dentaduras
21
Saturday, March 17, 2012

17.  Numero de dureza Knoop se calcula:
KHN = L
l2Cp
L = carga aplicada
l = el largo de la diagonal mayor de la
indentación
Cp = es una constante que relaciona l con el
área proyectada de la indentación
Unidades: Kg./ mm2
Saturday, March 17, 2012

18. Vickers,VHN
Saturday, March 17, 2012

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32. Rockwell
12.7 mm
Cargas: 30-150 kg
Saturday, March 17, 2012

33. Rockwell
A
Carga
B
Pre-carga
C
Tiempo
D
Recuperación
hasta
n
Saturday, March 17, 2012

34. ODONTO
Plásticos
30 Kg.
12.7 mm
Saturday, March 17, 2012

35. Pre-carga 3Kg
Carga 30 Kg. por 10 minutos
Plásticos son materiales
viscoelásticos, por lo que?
Deformación “rebota”
Saturday, March 17, 2012

36. % de recuperación
%R = A - B x 100%
A
“A” es la profundidad del indentador con la carga
aplicada por los 10 minutos
“B” es la profundidad de la indentación luego de
esperar 10 minutos.
Saturday, March 17, 2012

37. Material Indentación %
Micras Recuperación
Resina sin 113 74
relleno
Dientes 93 88
Acrílicos
Sellantes 85-158 74-86
Resina 56-72 70-83
Compuesta
Saturday, March 17, 2012

38. Shore A
Saturday, March 17, 2012

39. 1.6 mm
0 a 100
0.8 mm
Saturday, March 17, 2012

40. Material Dureza Shore A
Rebase dentaduras 48-85
Protectores bucales 67
Silicona maxilofacial 25
Saturday, March 17, 2012

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44. Saturday, March 17, 2012

45. Nanoindentaciones
Saturday, March 17, 2012

46. AF M
Saturday, March 17, 2012

47. A tomic
F orce
M icroscope
Saturday, March 17, 2012

48. Dureza superficial
tamaño de indentación
profundidad de indentación
Saturday, March 17, 2012

49. Microdureza 3.9 GPa
Módulo elastic. 87.5 GPa
Microdureza 3.3 GPa
Módulo elastic. 72.6 GPa
Saturday, March 17, 2012

50. Saturday, March 17, 2012

51. Hardness (GPa) Elastic Modulus (GPa)
120
Lingual 6 Lingual
Buccal 110
Buccal
5.5
100
5
90
4.5
4.0 Dentin 80
Dentin
3.5 70
Pulp 3 Pulp
60
2.5
50
Mapeo por nanoindentación de la superficie dental
Saturday, March 17, 2012

52. Fricción
Saturday, March 17, 2012

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57. Saturday, March 17, 2012

58. Desgaste
Saturday, March 17, 2012

59. Saturday, March 17, 2012

60. Saturday, March 17, 2012

61. 7nm
Saturday, March 17, 2012

62. Saturday, March 17, 2012

63. Saturday, March 17, 2012

64. Bueno Malo
Pulido Atrición
Erosión
Abrasión
Saturday, March 17, 2012

65. Saturday, March 17, 2012

66. Desgaste
Saturday, March 17, 2012

67. Desgaste
Saturday, March 17, 2012

68. 3.
Saturday, March 17, 2012

69. <1>
Saturday, March 17, 2012

70. Atrición
Saturday, March 17, 2012

71. Saturday, March 17, 2012

72. Bruxismo=Atrición severa
Saturday, March 17, 2012

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74. Saturday, March 17, 2012

75. <2>
Saturday, March 17, 2012

76. Abrasión
Saturday, March 17, 2012

77. Saturday, March 17, 2012

78. <3>
Saturday, March 17, 2012

79. Erosión
Saturday, March 17, 2012

80. Factores
Contacto microscópico
Saturday, March 17, 2012

81. Factores
Interacción-superficies
Saturday, March 17, 2012

82. Factores
Dureza superficial
Saturday, March 17, 2012

83. Factores
Homogeneidad superficie
Saturday, March 17, 2012

84. Factores
Diferentes materiales
Saturday, March 17, 2012

85. Saliva actúa como lubricante,
disminuye lafricción
y por lo tanto el
desgaste
Saturday, March 17, 2012

86. Tipos de Desgaste
Adhesivo
Saturday, March 17, 2012

87. Tipos de Desgaste
Cohesivo
Saturday, March 17, 2012

88. Tipos de Desgaste
Fatiga de Superficie
Saturday, March 17, 2012

89. Tipos de Desgaste
Abrasivo
Saturday, March 17, 2012

90. Laboratorio Clínica
1 :1
Pruebas de desgaste
Saturday, March 17, 2012