lab putty
coltene whaledent
for provisional crowns
versa-temp: sultan…bis GMA composite
stiff robinson brush
9 preparation
Margins= 0.5 mm
Lingual= 1.0
occlusal reduction= 2.0
9 reduction
shoulder margin= 1.0
Facial reduction= 1.5
Occlusal convergence= 6-16
30 crown prep
occlusal reduction= 1.5
chamffer margin= 0.5
margin location= 0.5
buccal/lingual reduction= 1.0
occlusal convergence= 6-16
taper: inc in diameter per mm
ISO color coding
what you really blue gets better
15-60 of 5 mm
60-150 of 1 mm
reamer
file
hedstrom
- *reamer**
- taper/pointed/spiral cutting
- used to enlare root canals by rotary action
- process of sizing & finishing already drilled hole
- clockwise
file
tapered/pointed
-spiral w/ cutting edges
-used to enlarge the root canal by rotation/filing
- *k-file**
- square shaped blank (90)
- rasping/filing motion
- rhombus blank—2 acute angles (sharpness/cutting)
- –2 obtuse angles (space for debris removal)
-greater flexibility
flex-r file
- non cutting tip, reducing (ledge formation & canal transportation)
- triangular cross section—provides flex in curve canals
- cut during counter clockwise rotation
hedstrom file (h-file)
- spiral edges as buttress threaded screw
- cutting on pull stroke
- used to remove old root fillings, and to plane canal walls
- poor fracture resistance on rotation
broach
taperes & pointed—thin/flexible/fragile
-sharp projections curving backward & obliquely
-used for removal of pulp tissue & for removing cotton wool dressing pellets
- *spreader**
- tapered metal instrument used to compress filling material against the sides of the cnal to make room for additional gutta percha cones
2 bands= 4% = 0.04 taper
3 bands= 6%= 0.6 taper
normal
hypotaurodont
mesotaurodont
hypertaurodont
class 1 2 3 4
I , Y, II, upside down Y
mandibular central & lateral incisors
mandibular canine
mandibular 1st premolar
