midterm1; waxup 25-27, 3 waxup

Question 1

for waxup which teeth should occlude in anterior guidance

Answer 1

-25 can touch 8
-26 can touch 8
27 can touch 7 and 6 (both or one)

Question 2

how many cusps does max first molar have- whats their height ratios

Answer 2

4-5 cusps

Heights: ML>MB>DB>DL

Question 3

wheres the transverse and oblique ridges on 3

Answer 3

transverse between MB and ML

oblique between DB and ML

Question 4

which fossa does 3 have

Answer 4

? central fossa and distal only

Question 5

what are the 5 steps for making 3 waxup

-what color did we use

Answer 5

1.proximal contact bars ;beige
2. marginal ridges and cusp cones’‘grey
3. cusp ridges;beige
4. triangular ridges and buccal and lingual contour ridges;gray
5. buccal and lingual line angles; gray
filled in beige

Question 6

what was the occlusal contact requirement for 3 waxup

Answer 6

minimum requirement was one contact, mesial marginal ridge or fossa, central fossa or distal fossa or fucntional cusp (Ml or dl)

Question 7

which preps are we doing for wax to occlusion

Answer 7

12, 13,14 and 28, 29 , 30

Question 8

what are acceptable contact points on 12, 13 and molar 14?

Answer 8

12 and 13 have contacts at lingual cusps and mesial fossa (2 contacts)
14 can have at MB cusp, DB cusp, distal cusp, distal fossa Or central fossa (3 contacts needed)

Question 9

whats characteristic of class I angle occlusion

Answer 9

tip of mesiobuccal cusp of maxillary first molar is aligned with the mesiobuccal groove on the mandibular first molar
-maxillary canine fits into facial embrasure between mandibular canine and first premolar

Question 10

what are the advantages/disadvantages of cusp to fossa vs cusp to marginal ridge

Answer 10

cusp to fossa: adv-occlusal forces with the long axis of the tooth. disadv; rarely on natural occlusion
cusp to marginal ridge: natural type of occlusion, 95% of adults , disadv; not ideal for full mouth reconstruction

Question 11

when would you have cusp to fossa vs cusp to marginal ridge applied?

Answer 11

• cusp to fossa for a full mouth reconstruction

- cusp to marginal ridge for a single restoration (most)

Question 12

maxillary posteriors; what are the contact points? (cusp to fossa ideal

Answer 12

first premolar; mesial fossa contact from B cusp of first premolar

second premolar; mesial fossa contact of B cusp of second premolar

first molar; contact on mesial fossa from MB cusp of first molar, contact on central (?) fossa from DB cusp of first molar, distal fossa contact from D cusp of first molar

second molar; has mesial fossa contact of MB cusp of second molar, central groove contact of DB cusp of second molar

Question 13

what is the relation between cusp pathways and the central groove on non working side?

Answer 13

the pathway is oblique to the central groove for the non working side
(should be no contact)

Question 14

mandibular posteriors; what are the contact points By maxillary teeth
(cusp to fossa ideal)

Answer 14

third molar; dl cusp of third molar contacts distal. ML cusp contacts central

second molar, DL cusp contacts distal, ML cusp contacts central

first dl cusp contacts distal, ml ‘’ central

second premolar; distal fossa

first premolar; distal fossa

Question 15

what is working movement? what should contact be on waxup

Answer 15

working movement is mandible moving toward cheek. we want no contact during working movement

working side= side where chewing happens when mandible moves right or left

Question 16

whats the cusp pathway vs central groove for the working side

Answer 16

right angle central groove to cusp path

Question 17

what are the non interfering posterior teeth determinants (3)

Answer 17

• location of cusp tips
• position and contour of the fossa
• plane of occlusion

Question 18

how should the lower cast be mounted

Answer 18

parallel to horizontal plane with a slight tilt for the curve of spee

Question 19

how many occlusal contacts are needed per molar and premolar for the waxup

Answer 19

2 per premolar, 3 per molar

Question 20

for waxup ; where should contact points be on premolars and molars of maxilla

Answer 20

premolars; lingual cusp and mesial fossa

molars; needs 3 contacts. acceptable ones=ML cusp, DL cusp, mesial fossa , central fossa, distal fossa

doing 12, 13, 14

Question 21

for waxup where should contact points be on premolars/molars of mandible

Answer 21

premolars; buccal cusp and distal fossa (2 needed)

molars: 3 needed. options=MB cusp, DB cusp, distal cusp, distal fossa, or central fossa

(doing 28, 29, 30)

Question 22

should there be contact for working/non working movement on waxup?

Answer 22

NO

Question 23

when are cusps in contact w fossa opposing

Answer 23

during MI only