Occlusion Midterm

  1. what type of joint is the TMJ?
    Ginglimoarthrodial joint

    • ginglymus--hinge joint; uniaxial joint in which a cylindrical convexity in one bone fits into a corresponding concavity on the other  
    • arthrodia-- a sliding joint
  2. what type of dense fibrous connective tissue is found in the condyle
    fibrocartilage 

    NOT hyline
  3. True/False: the disk is biconcave and avascular
    TRUE
  4. ____ of the TMJ is highly vascular and innervated
    retrodiscal tissue
  5. the superior lamina of the retrodiscal tissue consists ___ while the inferior lamina consists of _____
    elastic fibers

    collagen fibers
  6. what movement occurs in the superior joint space
    translational
  7. what movement occurs in the inferior joint space
    rotational
  8. what is the function of the mandibular ligaments
    they are there to restrict movement and can't be stretched
  9. what does the stylomandibular ligament do?
    limits the extreme protrusion of the mandible
  10. what ligament is accessory to the TM articulation
    sphenomandibular
  11. what ligament limits mandibular rotation on opening?
    superficial
  12. what ligament limits posterior movement?
    medial
  13. during opening:

    inferior lateral ptyergoid is _____
    superior lateral ptyergoid is _____
    • contracting (to pull the condyle forward) 
    • relaxed (to allow the elastic fibers to start pulling the disk more to the top of the condyle)
  14. which muscle is inactive during opening?
    superior lateral ptyergoid
  15. during closing:

    inferior lateral ptyergoid is _____
    superior lateral ptyergoid is _____
    • relaxed
    • contracted
  16. which muscle is active during closing?
    superior lateral pterygoid 

    in conjunction with elevator muscles
  17. bilateral contraction of the inferior lateral pterygoid muscles causes
    protrusion of the mandible
  18. unilateral contraction of inferior lateral pterygoid muscles causes
    movement of the mandible to the opposite side
  19. pure rotational movement occurs until...
    the anterior teeth are about 20-25 mm apart
  20. where does pure rotation movement occur
    along the mandibular hinge axis in the inferior joint space
  21. while maximum mouth opening the condyle...
    translates down the articular eminence
  22. refers to the contact between teeth when the jaw is closed
    static occlusion
  23. refers to contacts made between teeth when jaw is in motion (example: chewing food)
    dynamic occlusion
  24. the jaw position when the condyles are in the most superior-anterior position in the articular fossae resting against the posterior slops of the articular eminences with the discs properly interposed
    Centric Relation
  25. what is essential for a peaceful, coordinated musculature?
    completely released inferior lateral pterygoid muscles
  26. when is peaceful, coordinated musculature achieved?
    in the absence of deflective occlusal interferences to centric relation
  27. True/False: centric relation involves tooth to tooth contact
    FALSE this is independent of tooth contact and is a bone to bone relationship
  28. what is the only condylar position that permits an interference-free occlusion?
    centric relation
  29. 5 criteria for centric relation
    • disk is properly aligned on both condyles
    • condyle-disk assembles are at the highest point possible against the posterior slopes of the eminences 
    • the medial pole of each condyle-disk assembly is braced by bone
    • the inferior lateral pyterygoid muscles have released contraction and are passive
    • the TMJ can accept firm compressive loading with no sign of tenderness or tension
  30. the position of the mandible where a maximum number of upper teeth are making contact with their opposing lower teeth

    a tooth to tooth relationship; a tooth guided relationship

    complete intercuspation of the opposing teeth, independent of condylar position
    CO or MI
  31. occurs when the eruptive force is stopped by the repetitive positioning of the mandible in relation to maxilla
    Vertical dimension of occlusion
  32. what type of the level is the mandible?
    Class III
  33. since the load of something diminishes as the level arm increase what does this cause for occlusion?
    less load placed on anterior teeth than on the posterior teeth
  34. forward and downward movement of the mandible, both condyles move downward (down the articular eminence) and forward
    Protrusive
  35. when the mandible slides to one side:

    the side the mandible shift to is called the ____ and the same side condyle is called the ____
    working side

    working condyle
  36. movement on the working side is called
    laterotrusive movement
  37. when the mandible slides to one side:

    the side the mandible shift away from is called the ____ and the same side condyle is called the ____
    • balancing or non-working side
    • balancing or non working condyle
  38. movement to the opposite side during lateral movement is called
    mediotrusive movement
  39. Example: mandible is shifting to the left:

    left side: 
    left side movement:
    left condyle:
    right condyle:
    • left side: working side
    • left side movement: laterotrusive 
    • left condyle: rotates-rotating condyle
    • right condyle: translates-orbiting condyle
  40. a slight lateral translation of the condyle on the working side in the horizontal plane is know as
    bennett movement or mandibular side shift
  41. during lateral movement the nonworking condyle moves
    downward, forward and medially
  42. centric holding, supporting and functional cusps
    stamp cusps
  43. what are the stamp cusps for maxillary and mandibular
    • maxillary lingual
    • mandibular buccal
  44. where do stamp cusps occlude?
    the central fossa and the marginal ridges of opposing teeth
  45. non supporting, guiding cusps
    shearing cusps
  46. what are the shearing cusps for maxillary and mandibular
    • maxillary buccal
    • mandibular lingual
  47. what is the function of shearing cusps
    they contact and guide mandible during lateral movements and shear food during mastication
  48. stamp and shearing cusp ridges meet to form
    the fossa
  49. in a static occlusal relationship the maxillary teeth are ___ ___ than the mandibular teeth
    more posterior
  50. Which occlusion class? 

    1.The MB cusp of the mandibular first molar occlude in the embrasure area between the maxillary second premolar and the first molar

    2.The MB cusp of the first molar is aligned directly over the buccal groove of the mandibular first molar

    3.The ML cusp of the maxillary first molar is situated in the central fossa area of the mandibular first molar
    Class I
  51. Which occlusion class?

    1.The mesiobuccal cusp of the mandibular first molar occludes in the Central fossa area of the maxillary first molar.

    2.The mesiobuccal cusp of the mandibular first molar is aligned with the buccal groove of the maxillary first molar.

    3.The distolingual cusp of the maxillary first molar occludes in the central fossa area of the mandibular first molar.
    Class II
  52. Which occlusion class?

    1.The distobuccal cusp of the mandibular first molar is situated in the embrasure between the maxillary second premolar and first molar.

    2.The mesiobuccal cusp of the maxillary first molar is situated over the embrasure between the mandibular first and second molar.

    3.The mesiolingual cusp of the maxillary first molar is situated in the mesial pit of the mandibular second molar.
    Class III
  53. Names for 

    Class I
    Class II
    Class III
    • Class I: normal
    • Class II: retrognathic
    • Class III: prognathic
  54. The distance between the labial incisal edge of the maxillary incisor and the labial surface of the mandibular incisor in the intercuspal position.
    Overjet (Horizontal overlap)

    The horizontal distance by which the maxillary anteriors overlap the mandibular anteriors
  55. The distance between the incisal edges of the opposing anterior teeth.
    Overbite (vertical overlap)
  56. When the mandibular anterior teeth contact at the gingival third of the lingual surfaces of the maxillary teeth.
    deep bite
  57. when there is a space between the anterior teeth
    open bite
  58. If in an anterior class II relationship the maxillary central and laterals are at a normal labial inclination, it is considered to be a _____.
    division 1
  59. If in an anterior class II the maxillary incisors are lingually inclined the anterior relationship is termed a ____
    division II
  60. An imaginary surface that theoretically touches the incisal edge of all incisors and the tips of occluding surfaces of all posterior teeth.
    plane of occlusion
  61. In lateral view, an imaginary line is drawn through the buccal cusp tips of the posterior teeth (molars and premolars), a curved line following the plane of occlusion will be established


    This curve is convex for the maxillary arch and concave for the mandibular arch.
    curve of spee
  62. In frontal view, if a line is drawn through the buccal and lingual cusp tips of both the right and the left posterior teeth, a curved plane of occlusion will be observed.

    The curvature is convex in the maxillary arch and concave in the mandibular arch.
    curve of wilson
  63. Referes to the relationship of the teeth in one arch to those in the opposing arch.
    interarch tooth alignment
  64. mandibular buccal cusps occlude in the central fosse of the maxillary teeth and the maxillary lingual cusps occlude in the central fossae of the mandibular teeth.
    Normal buccal-lingual relationship
  65. mandibular lingual cusps occlude in the central fossae of the maxillary teeth and the maxillary buccal cusps occlude in the central fossae of the mandibular teeth.
    posterior cross bite
  66. what is the preferred occlusion pattern
    cusp to fossa contact (tooth to tooth pattern)
  67. Why cusp fossa is the preferred occlusal scheme? (3)
    Food impaction is prevented.

    Centric relation closure forces are nearer the long axes of the teeth.

    Improved stability results from the tripod contacts for each functional cusp.
  68. Posterior ____ contacts can occur between the mesial inclines of the maxillary teeth and the distal inclines of the mandibular teeth
    retrusive
  69. Posterior ____ contacts occur between the distal inclines of the maxillary lingual cusps and the mesial inclines of the opposing fossae and marginal ridges.
    protrusive
  70. occlusion scheme when there is maximum number of teeth in contact in MI and all excursive position 

    good when fabricating dentures but not for natural teeth
    bilaterally balanced articulation
  71. occlusion scheme where excursive contact occurs between all opposing posterior teeth on only the laterotrusive (working) side
    unilaterally balanced articulation aka group function
  72. with group function on the mediotrusive side no contact until when?
    the mandible has reached central occlusion
  73. occlusal scheme where the six anterior maxillary teeth, together with the six anterior mandibular teeth, guide all excursive movements of the mandible, and no posterior occlusal contacts occur during any lateral or protrusive excursions.
    mutually protected articulation
  74. in MPA:

    anterior teeth accept ______ load
    posterior teeth accept______ load
    • horizontal
    • vertical
  75. in which occlusion scheme do the Canines disclude the posterior teeth (central and lateral incisor contact is optional).
    mutually protected occlusion
  76. in which occlusion scheme do all the teeth in the working side are involved in the disocclusion and it is not a mutually protected occlusion.
    Group Function Occlusion
  77. with mutually protected occlusion ideally, the posterior teeth only contact in _____ _____
    centric relation (CR and/or MI)
Author
arikell
ID
340864
Card Set
Occlusion Midterm
Description
Material from Occlusion Midterm
Updated