Morph.txt

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Author:
emm64
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151631
Filename:
Morph.txt
Updated:
2012-05-02 10:40:03
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Morphology
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Morphology midterm
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  1. mineral gypsum
    Dihydrate Calcium Sulfate CaSO4*2H2O
  2. Gypsum Products
    • Made through calcination
    • Calcium Sulfate Hemihydrate CaSO4*1/2H2O
    • CaSO4 • 2H2O + heat--> CaSO4 • 1/2 H2O
    • General reaction:
    • CaSO4 • 1/2 H2O + 11/2 H2O --> CaSO4 • 2 H2O + 3900 cal/gm mole
    • EXOTHERMIC
  3. Expansion
    • crystals->fibril network->expansion->decreased accuracy
    • plaster .2-.3%
    • stone .08-.1%
    • improved (die) stone .05-.07%
    • More water->less expansion
    • More spatulation->increases expansion
  4. Water temperature
    higher->faster
  5. Calcination
    • water of crystallization or hydration is driven off
    • 1. Heating open kettle 110-120C=Beta form CaSO4 * 1/2 H2O, porous irregular, impression plaster (some model)
    • 2. Autoclave 130C=alpha form=dense regular, needle-like- model plaster & regular stone
    • 3. Boiling in 30% CaCl2=alpha form, stubby, regular dense crystals= high-strength(improved, die) stones
  6. W/P ratios
    • plaster .5
    • stone .3
    • improved die stone .2
    • (less water, stronger)
    • more water
    • Longer setting
    • Smaller expansion
    • WEAKER
  7. Increasing spatulation
    • decrease setting time
    • increase expansion
  8. Optimum Occlusion (Okeson's)
    • CR = ICP
    • Axial loading of teeth
    • Canine guidance laterally
    • Anterior guidance protrusively
    • Posterior contacts are heavier than anterior
  9. Condylar guidance
    steep condylar path, taller posterior cusps may be
  10. anterior guidance
    • mandibular incisor edge contact lingual of maxillary
    • protrusive incisal inclination = 50-70 degrees
    • steeper protrusive path, taller posterior cusps may be
  11. Horizontal overlap
    • maxillary anteriormost to incisal edge of mandibular
    • Greater HO, less steep the protrusive angle
    • Greater VO, (mandibular incisal to maxillary incisal), the more steep protrusive angle
  12. Influence of posterior teeth disclusion (function)
    • 1. anterior guidane
    • 2. Condylar inclination angle (TMJ)
    • closer to each the greater the effect
  13. Superior border movement
    when CR=ICP
  14. Gypsum product strengths
    • COMPRESSION (8X) Tensile
    • DRY (2X) wet
    • improved>stone>plaster
    • Compression strenght similar to abrasion resistance
    • Spatulation and temp have no strength effect
  15. Impression interference
    • K2SO4, blood, saliva may interfere w setting
    • sprinkle dry stone on impression then rinse
  16. thixotropy
    • softening, or reducing of viscosity, by application of rapid shear stresses
    • vibrate to make flow
  17. Restorative Dentistry goal
    maintain or obtain stable occlusion
  18. Centric Relation
    • CONDYLAR
    • anterior, superior braced along emininence of glenoid fossa with articular disc interposed between condyle and eminence
    • SAM = superior, anterior, mid
    • restorative reference for diagnosis and treatment
  19. Retruded Contact Position
    In CR, 1st point of contact
  20. Optimal occlusion
    ICP while CR (40-60%)
  21. TMJ anatomy
    articular eminence comprised of thick cortical bone
  22. Where is nerves and vessels of disc?
    posterior, not for stress bearing
  23. Where is anterior disc attached?
    • superior head of lateral pterygoid via muscle fibers
    • medial lateral heads of condyle via liagaments
  24. Bennett Angle
    • During Right lateral
    • Left condyle moves in a line downward and to the left as viewed from the horizontal plane
    • ANGLE with sagittal Plane is bennett angle about 7.5 degrees is normal
  25. Immediate side shift (bennett shift)
    • immediate straight medial movement of non-working condyle
    • 0.4-3.0mm
    • occurs prior to condyle translating forward
    • As ISS increases the Buccal-Lingual dimension of marginal ridge, fossa and Central groove increses
  26. Progressive Side Shift (bennett shift)
    • continued medial movement of non-working (orbiting) condyle
    • proportional to forward movement
    • ass progressive side shift increases, balancing angles become flatter
  27. Bennett movement
    • In a lateral movement
    • working condyle ROTATES
    • non-working condyle ORBITS
    • lateral shift of mandible to working side
    • working side teeth=>working inclines
    • non-working side teeth=> balancing inclines
  28. What are the determinates of mandibular movement?
    • 1. Posterior = R&L TMJ
    • 2. Anterior = teeth (altered w ortho, restoration, occlusal equilibration)
    • 3. Neuromuscular System
  29. Occlusal interferences
    • teeth prevent normal jaw function
    • 1. Centric
    • 2. Working
    • 3. Non-working
    • 4. Protrusive
  30. Optimum Occlusion (Okeson)
    • CR = ICP
    • Axial loading of teeth
    • Canine guidance laterally
    • Anterior guidance protrusively
    • Posterior contacts are heavier than anterior
  31. Condylar guidance
    • STEEPER path->TALLER the posterior cusps MAY be.
    • SHALLOWER path->SHORTER cusps MUST be
  32. Anterior Guidance
    • mandibular incisor => linguals of maxillary incisors
    • protrusive incisal inclination = 50-70 degrees
    • Steeper protrusive incisal path, taller poster cusps MAY be
    • Shallower protrusive incisal path, shorter the posterior cusps MUST be
  33. OVERLAP
    • the greater the HO (overjet), the less steep the protrusive angle (shorter posterior must)
    • the greater the VO (overbite), the more steep the protrusive angle (taller posterior may)
  34. When is Superior Border Movement achieved?
    when ICP is achieved in CR
  35. Picket fence review
  36. Alginate constituents and reaction
    • K-alginate
    • CaSO4 dehydrate-form insoluble Ca-alginate
    • NaPO4 provide working time
    • KSO4 counteract inhibiting effect on gypsum
    • Diatomaceous earth-consistency strength, most compound
    • Glycols-dustless
    • Flavoring
    • RXN
    • 1. NaPO4+CaSO4
    • 2. Ca2+ + K-alginate -> Ca-alginate
    • Net:
    • K-alginate + CaSO4 + H2O=>Ca-alginate + KSO4
  37. Alginate water temperature range?
    • 64-75
    • colder->longer setting and working times
  38. Alginate powder/liquid ratio
    • more powder:
    • 1. MORE strength, tear resistance, consistency
    • 2. LESS working, setting times and flexibility
  39. Impression Removal
    • faster removal:
    • HIGHER Stiffness, tear strength
    • LESS deformation
    • Leaving in too long causes syneresis
  40. Bilateral Balanced
    • occlusion where max tooth contacts in all excursive movements
    • good for complete dentures to prevent tipping
  41. Unilateral balanced
    • Group function
    • all teeth contact on working side during laterotrusion
    • usefull for full mouth reconstructions
  42. mutually protected
    • occlusion that includes anterior and canine guidance
    • anterior cause immediate disclusion of posterior during excursive movements
    • posterior are loaded along long axis
    • posterior protect anterior in ICP
    • CR=ICP
  43. Molar Disclusion
    • slight discrepancy between repeated excursive movements
    • must allow enough room so they dont clash during disclusion
  44. . During a right laterotrusive movement:
    A. The right condyle is orbiting.
    B. The left condyle is rotating.
    C. The steepness of the facial inclines of the
    lingual cusps of #3 is critical.
    D. All of the above.
    E. None of the above.
    E
  45. During protrusion which inclines interfere?
    • distal inclines of maxillary
    • mesial inclines of mandibular
  46. During a lateriotrusive movement on the right side of the
    mandible with optimal occlusion:

    A. The lingual surface of tooth #6 is providing
    canine guidance.

    B. The facial surface of tooth #27 is
    contacting it’s opposing tooth.

    C. The left condyle is orbiting.

    D. All of the above.

    E. None of the above.
    D
  47. Which
    posterior cusp inclines are most likely to me involved in protrusive
    interferences?

    A. Mesial

    B. Desital

    C. Facial

    D. Lingual
    A Mesial
  48. Which maxiallary posterior cusp
    inclines are most likely to me involved in mediotrusive interferences?

    A. Mesial

    B. Desital

    C. Facial

    D. Lingual
    C Facial
  49. During a right laterotrusive movement:

    A. The right condyle is orbiting.

    B. The left condyle is rotating.

    C. The steepness of the facial inclines of the
    lingual cusps of #3 is critical.

    D. All of the above.

    E. None of the above.
    E. None

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