midterm1; waxup 25-27, 3 waxup Flashcards
for waxup which teeth should occlude in anterior guidance
-25 can touch 8
-26 can touch 8
27 can touch 7 and 6 (both or one)
how many cusps does max first molar have- whats their height ratios
4-5 cusps
Heights: ML>MB>DB>DL
wheres the transverse and oblique ridges on 3
transverse between MB and ML
oblique between DB and ML
which fossa does 3 have
? central fossa and distal only
what are the 5 steps for making 3 waxup
-what color did we use
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
what was the occlusal contact requirement for 3 waxup
minimum requirement was one contact, mesial marginal ridge or fossa, central fossa or distal fossa or fucntional cusp (Ml or dl)
which preps are we doing for wax to occlusion
12, 13,14 and 28, 29 , 30
what are acceptable contact points on 12, 13 and molar 14?
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)
whats characteristic of class I angle occlusion
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
what are the advantages/disadvantages of cusp to fossa vs cusp to marginal ridge
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
when would you have cusp to fossa vs cusp to marginal ridge applied?
- cusp to fossa for a full mouth reconstruction
- cusp to marginal ridge for a single restoration (most)
maxillary posteriors; what are the contact points? (cusp to fossa ideal
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
what is the relation between cusp pathways and the central groove on non working side?
the pathway is oblique to the central groove for the non working side
(should be no contact)
mandibular posteriors; what are the contact points By maxillary teeth
(cusp to fossa ideal)
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
what is working movement? what should contact be on waxup
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
whats the cusp pathway vs central groove for the working side
right angle central groove to cusp path
what are the non interfering posterior teeth determinants (3)
- location of cusp tips
- position and contour of the fossa
- plane of occlusion
how should the lower cast be mounted
parallel to horizontal plane with a slight tilt for the curve of spee
how many occlusal contacts are needed per molar and premolar for the waxup
2 per premolar, 3 per molar
for waxup ; where should contact points be on premolars and molars of maxilla
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
for waxup where should contact points be on premolars/molars of mandible
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)
should there be contact for working/non working movement on waxup?
NO
when are cusps in contact w fossa opposing
during MI only
