Ortho - Lecture 11: Banding and Bonding Flashcards
Steps in banding
Separation
Fitting bands
Cementation
Which method of separation?
Exert a scissors action above and below the contact, typically opening enough space for banding in approximately 1 week
Separating springs
Which method of separation?
Surround the contact point and squeeze
teeth apart over a period of several days
Elastometric separators
Elastometric separators should not be used for longer than __________
2 weeks
The upper molar band should straddle the ________ ________, and this can be checked by viewing from the occlusal. The band should be checked from the _________ to ensure it is parallel with the buccal cusps.
buccal groove; buccal
The lower second molar tube should straddle the __________ __________, and the lower first molar tube should straddle the ______________ ___________. With large lower first molars, it may be helpful to place the tube a little distal of this position
buccal groove; mesio-buccal groove
Steps in bonding
Cleaning
Enamel conditioning
Sealing
Bonding
Which step in bonding?
Cleaning of the teeth with pumice removes plaque and the organic pellicle that normally covers all teeth
Cleaning
Which step in bonding?
Use cheek retractors and saliva ejector to keep area dry, better environment for adhesives
Enamel conditioning
Which step in bonding?
After the operative field has been isolated, the conditioning solution (35% phosphoric acid gel) is applied over the enamel for 15 to 30 sec. Etched areas should appear frosty white. A routine etching removes 3 to 10 microns of surface enamel
Enamel conditioning
Which step in bonding?
After the teeth are completely dry and frosty white, a thin layer of bonding agent is applied over the etched enamel
surface. The coating may be thinned by a gentle air burst for 1 or 2 seconds
Sealing
Which step in bonding?
Small amount of the bonding agent is squeezed into the mesh on the back of the bracket, and it is pressed to place on the tooth surface. Excess bonding material is
removed from around the bracket. The
bracket is bonded in place
Bonding
When direct bonding brackets, avoid viewing teeth from the side, or from ________ or _______. It is important to view the teeth from the correct perspective
above; below
In regards to horizontal accuracy: __________ and _________ have relatively flat facial and buccal surfaces, and small errors do not significantly affect the position of the teeth
incisors; molars
In regards to horizontal accuracy: _________ and ___________ have more rounded facial
surfaces, and therefore accuracy is important because errors in horizontal bracket positioning cause rotations
canines; premolars
T/F: Viewing canines, premolars, molars and rotated incisors occlusally with a mouth mirror helps bracket positioning relative to the vertical long axis of the crown.
True
On a rotated tooth, the bracket can be bonded slightly more ___________ or __________. This way, full correction of the rotation can be achieved
mesially; distally
It is necessary to accurately visualize the vertical long axis of the crown of each tooth to achieve accuracy, because errors will cause incorrect tip position of teeth. The bracket wings need to be parallel to the long axis and to evenly straddle it
Axial accuracy
This is the most difficult aspect of bracket positioning, and accuracy is greatly improved by the use of gauges
Vertical accuracy
In the incisor region, the gauge is placed at _____ degrees to the labial surface
90
In the canine and premolar regions, the gauge is placed ___________ with the occlusal plane
parallel
In the molar regions, the gauge is placed ___________ with the occlusal surface of each individual molar
parallel
Positive value on tip means roots incline __________
distally
Negative value on tip means roots incline ___________
mesially
Positive value on torque means roots are maintained _____________
lingually
Negative value on torque means roots are maintained _____________
bucally
Every bracket has a colored dot. This colored dot must be placed ____________
disto-gingivally
