The crown of each tooth was segmented at cemento-enamel junction with # 701 diamond tapered fissure bur
(Mani Incorporation, Tochigi Japan) with high-speed air turbine (NSK Japan) at 360,000-450,000 rpm under constant irrigation with water spray.
Caption: Figure 2: Removal of fracture fragment: (a) radiograph; (b) fissure bur
was used to remove the fractured screw; (c) occlusal view.
Cuts around the lesion were marked using 703 straight fissure bur
. Using osteotome a large part of buccal cortical plate was removed from canine to tuberosity region and bone recountouring was done with large flame shaped tungsten carbide bur.
Class V cavities were prepared on the buccal surface of extracted premolar using round diamond bur for initial penetration followed by straights fissure bur
to extend the cavity margins.
A fissure bur
is then used to drill into the tooth at the CEJ and at a depth of 2/3 to 3/4 through the crown making sure not to cut completely through to the lingual plate as the lingual plate needs to be preserved and also to avoid any damage to the lingual nerve.
The coronal extent of the fusion was sectioned with a diamond fissure bur
and air turbine prior to raising a minimal localised mucoperiosteal flap, buccally and palatally, to fully expose the double tooth (Figure 4a).
For decay removal I used a 1557 straight, roundended, cross-cut fissure bur
(SS White) and confirmed the removal of all the decay and old alloy restoration.
Local anesthesia (lidocaine with 1:100,000 epinephrine) was administered and the labially projected portion of the crown was removed using straight fissure bur
All temporary cements were removed by fissure bur
and a drop of 0.
Initial penetration of pulp chamber was done with the help of tapering fissure bur
in a high speed contra angle hand piece, and was directed towards the axis of largest canal.
The study was also limited by the fact that the lower one third of root was sectioned with a straight fissure bur
manually and the distance from the file tip and minor constriction was also measured manually, so there were chances of misinterpretation.
Finally the mesiobuccal roots of each tooth were sectioned in a horizontal plane 6mm below the cemento-enamel junction with a crosscut fissure bur
in high speed handpiece.