DMFE II Midterm

the static relationship between the incising or masticating surfaces of the max. and mand. teeth

- static and dynamic contact relationship between occlusal surfaces of teeth during function
- "dynamic occlusion"

achieve and maintain a harmonious relationship in rest and function b/w dentition, tmj, muscles of mastication and muscles of expression

no

- maxillomandibular relationship
- independent of tooth contact
- condyles articulate in the anterior-superior position against the posterior slope of the articular eminences
- in this position, the mandible is restricted to a purely rotary movement
- clinically useful and repeatable reference position

the occlusion of opposing teeth when the mandible is in centric relation
- may or may not coincide with MIP

- complete intercuspation of opposing teeth independent of condylar position
- sometimes referred to as "best fit"
- when teeth are in co, each tooth of one arch is in occlusion with two others in opposing arch (except for mand. central incisors and max. third molars

- short and blunt
- lingual cusps of max. posterior teeth
- buccal cusps of mand. posterior
- maintains vertical dimension and mip contacts

- tall and sharp
- buccal cusps of max. posterior teeth
- lingual cusps of mand. posterior teeth
- does not bear direct centric occlusal forces
- shears food & deflects tongue (mand. lingual cusps) and the cheek (max. buccal cusps) away from occlusal surfaces
- prevents biting of the tongue

- horizontal overlap
- projection of teeth beyond their antagonists in the horizontal plane

- vertical overlap
- the distance teeth lap over their antagonists as measured vertically
- vertical relationship of incisal edges of max. incisors to mand. incisors when teeth are in mip

- mechanical instrument that represents the tmj and jaws
- max. and mand. casts may be attached to simulate some or all mand. movements
- 4 classes of articulators

1) frontal (front from back)
2) sagittal (right from left)
3) horizontal (top from bottom)

an imaginary line around which the mandible may rotate within the sagittal plane

left side
- rotating condyle
- laterotrusive side
- WORKING SIDE

right side
- orbiting condyle
- mediotrusive side
- NON-WORKING SIDE
- balancing side

- angle formed between the sagittal plane and the average path of the advancing nonworking-side condyle as viewed in horizontal plane during lateral mandibular movements (BG)

- aka latertrusion
- condylar movement on the working side in the horizontal plane (C-->W)

- anterior guidance
- esthetic, function, phonetics

- R,L condyles

- shallow path requires a shorter cusp in presence of min. anterior guidance
- posterior cusps can be lengthened IF anterior guidance is increased

- diagnosis to dental occlusal conditions to PLAN procedures
- aid in fabrication of dental prostheses
- allow better control of recreating occlusal surface
- permit assessments
- communication in lab for occlusal analysis or creation of indirect restorations/pros
- correct or modify completed restorations

a simple holding instrument capable of accepting a single static registration
- vertical motion is possible

an instrument that permits horizontal as well as vertical motion but does not orient the motion to the temporomandibular joints
- no correlation to transverse hinge axis
- indications: single unit crown, stable mip, ovd

an instrument that simulates condylar pathways by using averages or mechanical equivalents for all or part of the motion
- allows for orientation of the casts relative to the joints ad may be arcon or non-arcon instruments
- can be non-adjustable or semi-adjustable

- diagnostic purposes
- fixed pros.
- implant pros.
- removable pros.
- fabrication of occlusal devices or orthoses

locates the actual hinge axis and relate maxilla to the hinge axis/stylus on the face to find the true rotational center

a device used to relate the maxillary cast to the condylar elements of an articulator by using average anatomic landmarks to estimate the position of the transverse horizontal axis

1. for esthetic cases
2. to determine occlusal plane and midline OR
- mainly b/c you want to record the relationship of the maxilla to the condyles when mounting in articulator

an instrument that will accept 3-d dynamic registrations
- allow for orientation of the casts to the temporomandibular joints and simulation of mandibular movement

hanau wide-vue whipmix crop

- type iii
- semi-adjustable
- arcon - condyle on lower member
- adjustable incisal guide table
- straight incisal pin
- condylar inclincation (adjustable)
- bennett angle (adjustable)

110mm

1. masseter
2. temporalis
3. lateral pterygoid
4. medial pterygoid

- origin: zygomatic arch
- insertion: mandible
- action: elevates and protrudes mandible

- origin: temporal fossa
- insertion: coronoid process of mandible
- action: closes jaw

- origin (superior head): infratemporal surface of grater wing of sphenoid
- origin (inferior head): lateral pterygoid plate
- insertion: pterygoid fovea, capsule of tmj
- action (acting together): protrude mandible
- action (acting alone): protrudes side of jaw
- action (acting alternatively): produces grinding motion

- origin (deep head): medial surface of lateral pterygoid plate and palatine bone
- origin (superficial head): tuberosity of maxilla
- insertion: ramus of medial mandible
- action: elevates mandible

- attachment: temporal fossa & tubercle to mandibular head
- permits side to side motion, protrusion, and retraction

- attachment: temporal to mandible
- thickened fibrous band of capsule

- attachment: between temporal bone and mandible
- divides joint into two synovial compartments

- attachment: styloid process to posterior ramus and angle of jaw
- limits anterior protrusion of mandible

- attachment: spine of sphenoid to lingula of mandible
- may act as a pivot by providing tension during opening and closing

vertical plane that divides body into left and right

flat plane that divides body into top and bottom

plane parallel to long axis of body, dividing it into front and back parts

curve in the posterior teeth connecting all the buccal cusp tips

side-to-side curve that connects the buccal and lingual cusps of the same type of posterior teeth on opposite sides

- occurs in the lower compartment of tmj capsule
- up to 20-25 mm

- occurs in the upper compartment of tmj capsule
- up to 40-50mm

sagittal and frontal

terminal hinge position

backward and upward movement of condyle

forward and downward movement of the condyle

lateral movement of the working condyle

medial movement of the working condyle

non-working condyle moves...
- medially
- forward
- downwards
working condyle moves...
- laterally

the most extreme positions to which the mandible is able to move
- all functional movements occur within the borders

50-60 mm

10-12 mm (with no tmj disfunction)

8-11 mm

1 mm

10%

the form and arrangement of occlusal contacts in natural and artificial dentition

1. mutually protected
2. group function
3. balanced

posterior teeth prevent excessive contact of anterior teeth in mip & anterior teeth disclude posterior teeth in all excursive movements
- posterior teeth HOLD mylar
- anterior teeth DRAG mylar

III

lateral and protrusive movement

the vertical and horizontal overlap of the canine teeth disclude all posterior teeth in the excursive movements of the the mandible

the vertical and horizontal overlap of the anterior teeth disclude all posterior teeth in the excursive movement of the mandible

space between opposing posterior occlusal surfaces during mandibular protrusion

mutually protected
- allows for immediate disclusion

multiple contact relations between the maxillary and mandibular teeth in lateral movements on the working side
- lateral force distributed equally to all teeth on the working side in eccentric movement
- no tooth contact on non-working side

false

1. compromised or missing anterior teeth
2. severe class ii or iii occlusion
3. seen frequently in natural dentition
4. easier to incorporate into natural dentition
5. force distrubution for long span FPD or compromised abutments

the bilateral, simultaneous contact of the anterior and posterior teeth in excursive movements

1. complete dentures
- rarely occurs in natural dentition
- difficult and undesirable to incorporate into natural dentition

allows for stability of the complete denture

tmj

- incisal guidance
- occlusal plane
- curve of spee
- curve of wilson

no, there needs to be reciprocal movement from the other joint

as the mandible is protruded, the condyle translates and descends along the articular eminence
- is a curved path
- usually measured/recorded by a straight line angle
- measured from horizontal reference plane

larger condyle inclination

a plane established by the lowest point on the margin of the right or left bony orbit and the highest point on the margin of the right or left bony auditory meatus

shorter the posterior cusps

anatomical
- may be recorded but cannot be altered (except surgically)

30 degrees

represented by the vertical and horizontal overlap of the anterior teeth

curved

the angle formed by the intersection of the plane of occlusion and a line within the sagittal plane determiend by the incisal edges of the max. and mand. central incisors when the teeth are in mip

70-80 degrees

decrease in incisal angle

incisal angle increases

decreases

protrude

variable
- can be altered by ortho, restorations, extractions, caries, habits, and tooth wear

the average plane established by the incisal and occlusal surfaces of the teeth

distal triangular fossa of the first premolar

distal triangular fossa of the second premolar

central fossa of the first molar

distal marginal ridge of the first molar and the mesial marginal ridge of the second molar