dental wax

Question 1

list the adv and disadv of dental wax

Answer 1

adv
1. inexpensive + easy to use
2. weak solids, readily shaped/moulded, plastic
3. low melting point and can be easily carved
4. combustible, entirely organic composition and non toxic
5. little memory and low thermal contraction = easy mods]

disadv
1. will distort when using in mouth over period of time
2. low elastic modulus, proportional limit and CS compared to other materials

Question 2

list the properties of wax

Answer 2

1. transition temperature
2. flow
3. thermal expansion
4. thermal conductivity
5. low melting + transition point
6. weak, mouldable, combustible and nontoxic
7. ability to be vaporised completely from the investment mould

Question 3

describe the composition of wax

Answer 3

components
1. mineral
2. plant
3. animal [insect]

major components
1. hydrocarbon wax
2. paraffin wax
3. bee’s wax
4. micro cystallising waxes

additives
1. dyes - natural + synthetic

Question 4

list the flash point, density and melting point of wax

Answer 4

flash point > 220°C
density 0.92
melting point of wax 50 - 100°C

Question 5

list the types of dental wax

Answer 5

1. modelling wax
2. inlay wax
3. wax patterns
4. blocking out wax
5. sticky wax
6. profile wax
7. sprue wax
8. periphery wax
9. diagnostic wax

Question 6

list the applications of modelling wax

Answer 6

1. as a registration rim
   records pt records such as:
   vertical dimension
   labial contour midline
   intercanine distance
   occlusal plane
   smile line
2. as a spacer
   creates space within a custom tray to ensure uniform thickness of imp material giving optimum accuracy
3. for try ins
   ability to show/make mods before pros is constructed
   most commonly used in densture construction

Question 7

describe the applications of wax patterns [partial castings]

Answer 7

1. allows us to create a replica of what will be cast into metal
2. ensure clasps and wrest = correct position
3. uniform and correct material thickness
4. create retenetion areas
5. eliminates some potential human errors

Question 8

describe the applications of profile wax [finishing lines]

Answer 8

1. creates finishing lines for addition of [acrylic + teeth] + porcelain in C/B
2. allows addition of tweezer holder on copings for use in C/B furnaces
3. allows a smooth transition between metal and other material for pt comfort

Question 9

outline the difference between an inlay and onlay + what materials they can be made from

Answer 9

• inlays = typically smaller + used in areas within the cusps [occ surface]
• only = fills in a tooth when damage incl surface structure and one/more cusps

materials
wax up
ceramic [porcelain]
allow
combination

Question 10

list the applications of inlay wax

Answer 10

1. inlay
2. onlay
3. crown

Question 11

outline the application of blocking out wax

Answer 11

removal of undersirable undercuts in consrtuction of splints or orthodontic appliances

Question 12

list the applications of sticky wax

Answer 12

1. articulation and mounting models
2. repairs [eg dentures]

Question 13

l

list the applications of periphery wax

Answer 13

1. border moulding [allows for muscle trimming when taking primary/secondary imps

Question 14

list the applications of diagnostic wax

Answer 14

1. Visualise the final aesthetic and functional outcomes
2. can be used in dx and tx planning