Autumn midterm: arbitrary mounting and 3ld Flashcards
what is kois
the alignment system with the index tray, rod position interpupillary etc. (vs arbitrary mounting)
what is arbitrary mounting
mounting stone models without kois analyzer record. using mounting table with arbitrary occlusal plane tilt and maximum intercuspation.
what is an incisal indicator
curved metal , define midline
what is the curve of spee
curve formed by connecting all buccal cusps in a quadrant.
in ideal occlusion, anteroposterior curve of the occlusal plane.. curve of maxillary arch is convex and mandibular is concave
how do you prepare the base for retention on a arbitrary mount
scratch it, moist and wet it well (no indexing)
what is the water/powder ratio, working time and setting time for mounting stone
- water (26 ml), powder (100 g)
- working time is 2-3 minutes
- setting time is 5 minutes
where should the incisal pin be when gluing for max intercuspation
touching the incisal plate! make sure of it.
what are the criteria for the esthetic waxup maxillary central incisors
-length should be 10.5-11 mm from gingival crest. (tooth 8 will be used as reference)
must be anterior guidance, (protrusive)- not sure what they mean here
symmetrical
what is the criteria for the maxillary lateral incisors length
.5 mm shorter than central incisors & symmetrical
what is the criteria for maxilary canines length and occlusion
same length as the central incisors
MI canine guidance- 11 and 22, 6 and 27
what are considerations before working on a patient
- perio health
- general condition- dentition hard tissue exam
- existing restorations
- occlusion
- caries risk assessment
alternative is ortho ( vs veneers) ? also doing nothing– this is another option
-gather: radiographs, extra oral photographs, intraoral photographs, and diagnostic casts
what is T-reference?
-a vertical line to establish midline and a horizontal lineparallel to the patients interpupilary line.
what are the golden width proportions for maxillary anteroirs
snow (1999) suggested theres an ideal. based on apparent width from the fromtal view.
- 25, 25 for central incisors, 15 and 15 for the lateral incisors and 10, 10 for the canines
- so the central incisors make up 50% of the width of all of these.
what tool can help with golden proportions
golden proportion ruler. panadent (templates) caliper or ruler.
what will you use for width and proportions vs length measurements
width and proportion; panadent
length: ruler
what are the available panadent measurements
7-10 mm options (.5 increments)
what are the incisal embrasure sizes (S M L)
small, medium , large (from midline to lateral)
what is the axial inclination of maxillary anteriors
from the frontal view, each maxillary anterior tooths long axis converges toward the midline
what should the width of central incisors be in the class project for waxing
length?
width : 8.5 -9.5 (8.5 panadent)
length: 10.5-11 mm (10.5 reference point from the crest of gingival number 8)
how much shorter than centrals should lateral incisors be
.5 to 1 mm shorter
what are the two types of lithium disilicate/ treatments needed for those
I: LD in form of ingots pressed; one heat treatment for crystallization
II: LD in form of block milled ; two stage heat for final crystalization
what are the brand names for LD mentioned in class
IPS e.max CAD and IPS e.max Press
when can monolithic llithium disilicatebe used
full coverage single units anterior teeth, multiple units anteiror bridges, premolars single unit and low stress bearing molars
what is ideal and the range for occlusal reduction of LD
ideal = 2 mm.
passing range = 1.51-2.99 mm (1.5 is a fail and 3 mm is a fail)
