winter quiz

Question 1

in the curve of spee (maxilla) where does the plane start to curve

Answer 1

the incisal edge of central incisors, canines, L cusp tips of premolars and the ML cusp of first molar are ALL ON THE SAME PLANE

-distal lingual cusp of first molar is higher, ML cusp of second molar is higher and DL cusp of second molar is higher

–this is less visible at the premolars and most noticable in the second molars
(anterior/posterior compensating curve)

Question 2

what is the curve of wilson? where does it start to curve?

Answer 2

side to side compensating curve.

• maxillary canines, L cusp tips of premolars and ML cusp of first molar are all ON THE SAME plane
• MB cusp of the first molar is higher
• -less visible at premolars and most noticable at second molars

Question 3

whts the monson sphere ? how large is it and

Answer 3

combination of curve of wilson and curve of spee

• includes sagittal, frontal AND coronal planes
• 10 cm (4 inch) radius sphere ; center of imaginary sphere is at glabella
• these all describe “ideal occlusal plane”

Question 4

which types of overlaps of anterior teeth are important to restorative dentists? orthodontists?

Answer 4

restorative; functional horizontal overlap =FHO. )incisal edge of lower anterior teeth to the lingual surface of the upper tooth)

orthodontists; overjet (OJ) labial surface upper anterior teeth to labial surface of lower anterior teeth( this is inferior to the FHO- at incisal edge of upper?)

Question 5

what is ideal for VO/ FHO?

Answer 5

VO should be large (4 mm is good), FHO should be small( even zero is good)
- a combo of large VO, smal FHO gives GOOD separation of posterior teeth in protrusion/excursion, cusps can be long in the posterior teeth

Question 6

what occurs with small VO, small FHO?

Answer 6

small VO is bad

-even tho small FHO is good, poor separation of posterior teeth will occur so the cusps MUST be short!

Question 7

what occurs with a large VO, and large FHO?

Answer 7

large VO is good, but large FHO is bad
-poor separation and cusps must be short!

note- example of a large FHO was 1.5 mm!! its best if close to zero!

Question 8

whats immediate mandibular lateral translation

Answer 8

a slight lateral translation of the ocndyle on the working side in the horizontal plane (latrotrusion, bennett movement , or mandibular side shift)

-may be slightly forward (lateroprotrusion), or slightly backward (laterotrusion)

orbiting/nonworking condyle travels forward and medially as limited by the medial aspect of the mandibular fossa and temporomandibular ligament

i think this is what i thought was translation

Question 9

what is a immediate side shift?

whats the lundeen and wirth value?

Answer 9

(or early) side shift of mandible where orbiting condyle moves straight medially as it leaves centric relation

0 to 3 mm, mean is 1 mm!

after the immediate shift the mediotrusive moving condyle then travels downward, forward and medially
-the laterotrusive side condyle moves straight laterally

Question 10

what are the 3 types of articulators

Answer 10

non adjustable, semi-adjustable and fully adjustable

Question 11

what type of articulator is ours

Answer 11

semi-adjustable

Question 12

whats an openo/closed track of articulator

Answer 12

open means you can separate the upper and lower halves

closed- condyle stays in a track, you cant usually remove uper and lower halves

Question 13

whats arcon/non arcon type of articulator

Answer 13

arcon: condyle of the articulator is attached to the lower half/lower member of articulator to follow the human skull
non arcon: condyle goes through/attach to upper half of the instrument

Question 14

what is an average value/non average value articulator

whats the intercondylar distance, condylar guidance, top wall radius, and medial wall

Answer 14

non average;

average; fixed value devices where

• intercondylar distance ; 110 mm (90-130)
• condylar guidance; 20-30 degrees
• top wall; 19 mm radius curvature
• medial wall ; 8-15 degrees

Question 15

whats optimal functional occlusion; closed mouth position

Answer 15

when the mouth closes, condyles in most superior anterior position (muscoskeletally stable) resting on posterior slope of articular eminence, with articular disc properly interposed. simultaneous bilateral contact of all posterior teeth and slight clearance of anterior teeth
-all posterior tooth contact provide axial loading of occlusal force

Question 16

whats optimal functional occlusion; laterotrusive movement?

Answer 16

adequate contacts on anterior laterotrusive side to separate all posterior teeth on mediotrusive side. canine guidance is preferred. group function is commonly found…

–with head upright and normal feeding position, posterior tooth contact is heavier than anterior contact

Question 17

whats optimal functional oocclusion; protrusive?

Answer 17

adequate contacts on anterior separate all posterior teeth. incisors and canine guidance preferrd but some premolar group function is found occasionally

Question 18

what is selective grinding

Answer 18

occlusal equilibration is an irreversible dental subtraction procedure to achieve optimal functional occlusion

Question 19

whats an occlusal splint

Answer 19

reversible removable dental addition procedure to achieve optimal functional occlusion