Class I and Class V Restoration Fundamentals Flashcards
Placing an Occlusal Restoration
Step 1:
Place Liner and/or Base if needed (Deep caries)
Materials: (2)
- Calcium Hydroxide (Ex: Dycal)
2. Glass Ionomer (Ex: Vitrebond)
Calcium Hydroxide (Ex: Dycal)
2 paste system, dispenses from separate tubes, mix Stimulates reparative dentin formation
Glass Ionomer (Ex: Vitrebond) (3)
2 paste system, dispenses from “clicker,” mix
Light cure
Releases fluoride over time
Place in — areas only. Keep away from margins.
deeper
Placed with — instrument (small ball shape)
Dycal
Calcium Hydroxide Liners (2)
LIFE OR DYCAL
Liner
placed in a thin layer over dentin
Base
placed in thicker layer on floor of prepared cavity
Placing an Occlusal Restoration
Step 2:
Seal Dentinal Tubules
Step 2: Seal Dentinal Tubules (2)
A. Not generally necessary
B. Types of desensitizers
A. Not generally necessary
Most preps do not require it, but some that would be especially prone to sensitivity may (ex. very young teeth- large pulp)
B. Types of desensitizers (3)
- Copal resin (Ex.: Copalite)
- Bonding Agents
- Gluteraldehyde & (2-hydroxyethyl)methylacrylate [HEMA] desensitizer (Ex.: Glumma)
Desensitizers (3)
Copal Resin (Ex: copalite)
Unfilled dentin bond agent (Ex: PQ-1, Peak)
Gluma
Copal Resin (Ex: copalite)
a. Advantage:
b. Disadvantage:
inexpensive , quick to use
leaves a film thickness (could wash out, causing
microleakage)
Unfilled dentin bond agent (Ex: PQ-1, Peak)
a. Advantage:
b. Disadvantage:
intermediate in cost
some require more than one step; involves some
form of etching with an acid, which researchers suggest may leave
teeth more vulnerable to recurrent caries; leave a film thickness.
Gluma
a. Advantages:
b. Disadvantages:
no film thickness, one step to apply
EXPENSIVE, somewhat caustic to soft tissues & possibly
to the pulp in deep preparations.
Application of desensitizer (3)
- Copal resin
-wipe cavity walls with cotton pellet soaked in resin,
then gently air dry - Dentin-bonded resins
-press resin into dentin using brush, gently air dry, light
cure - Gluma
-apply to walls for 30 seconds , dry, rinse, dry again.
-material is caustic; minimize contact with gingivae
and protect pulp with liner/base in deep preparations
prior to applying.
The Current Policy at UMKC
Regarding Dentin Desensitizer
We do not teach the standard use of dentin desensitizers under
amalgam. Studies suggest they make negligible difference in tooth
sensitivity on routine cases. The smear layer will seal most dentinal
tubules, and, after a few weeks, the amalgam will seal itself with an
oxide layer. Occasionally, after consultation with faculty, one might use
Gluma on an especially sensitive tooth, but place a liner or base first in
deep preparations.
Placing an Occlusal Restoration: Amalgam
Step 3:
Mix amalgam
Step 3: Mix amalgam
-adjust triturator mixing time according to manufacturer’s directions.
Placing an Occlusal Restoration: Amalgam
Step 4:
Dispense into Amalgam Well and Pick up
With Amalgam Carrier
Placing an Occlusal Restoration: Amalgam
Step 5:
Deposit amalgam into preparation using
amalgam carrier.
Step 5: Deposit amalgam into preparation using
amalgam carrier. (2)
Dispense a small amount
Allows for proper condensation
Placing an Occlusal Restoration: Amalgam
Step. 6:
Condense Amalgam using the small
Hollenback condenser.
Step. 6: Condense Amalgam using the small
Hollenback condenser. (2)
a. Tamp into the preparation to fix the amalgam in
place, perhaps using the larger condenser nib.
b. Use the small condenser nib to pack the material
FIRMLY into all line angles at a 45 ◦angle, using a
pressing, wiggling motion in a step-wise fashion.
Placing an Occlusal Restoration: Amalgam
Step 7:
Overfill the Preparation
~ 1.0 mm beyond the margins
Placing an Occlusal Restoration: Amalgam
Step 8:
Pre-carve burnishing
Using the side of the nib of the condenser or a large ball burnisher. Burnish
towards the margins to eliminate voids and to bring excess mercury to the
surface, where it can be carved away. Begin to define grooves.
Placing an Occlusal Restoration: Amalgam
Step 9:
Carve the Amalgam
Step 9: Carve the Amalgam (5)
a. Keep correct groove anatomy in mind.
b. Use the Hollenback carver held perpendicular to the margins.
c. Use the tip of the carver to recreate groove anatomy.
d. Carve exactly to the margins.
e. Remove all flash beyond the margins.
Placing an Occlusal Restoration: Amalgam
Step 10:
Check and Refine Occlusion
Step 10: Check and Refine Occlusion (5)
a. Remove rubber dam
b. Use articulating paper to mark occlusion(have patient close in
maximum intercuspation first and then move into lateral excursions).
c. Use the discoid carver to remove high occlusion marks and inclined
plane contacts.
d. Try to preserve cusp seats in the bottoms of fossae (long axis forces
on the teeth)
e. Other occluding areas should touch as usual (indicating no high
spots on the restoration which open the bite)
Placing an Occlusal Restoration: Amalgam
Step 11:
Smoothing the surface
Step 11: Smoothing the surface (2)
a. Use a beavertail burnisher to smooth surface, define
grooves, and eliminate voids (Avoid heavy burnishing on amalgam that is well along in its set. This could bring excess mercury to the
surface)
b. Wipe with a cotton pellet to smooth surface and to
leave a matte finish.
— is not always strictly necessary
Finishing
It is needed when something needs to be corrected: (6)
• Occlusion, overhang, anatomy, marginal plaque trap, contour
improvement
Research suggests that a well condensed, well carved amalgam
does not gain — from the finishing process
longevity
If you do need to finish/polish an amalgam
restoration, you must wait — after
placement for amalgam crystallization to be
complete
24 hours
Finishing and Polishing Amalgam INSTRUMENT SEQUENCE (3)
•Green stone (coarse)
•White stone (medium)
•12 bladed polishing bur
(medium-fine)
Finishing Burs -
12 bladed flutes Needle Point Flame 7902 Round 7006 Bullet 7404 Small round 7002 Bullet pointed 7104
Placement of the bur: (3)
•Put the tip of the bur in the central groove and lay the bur across the
enamel margin.
•Sequence is to go from the most abrasive to the finest polishing
instrument. This sequentially produces smaller and finer scratches.
•Refine, don’t destroy, the groove anatomy.
Criteria for finished amalgam: (5)
- Scratches and major surface irregularities should be eliminated.
- High polish is not necessary, can be done for esthetic reasons.
- The most important area is the cavosurface margin.
- Grooves should be definite but not deep. Contours should be maintained and not flattened.
- No occlusal prematurities. Natural occlusal marks on the tooth should be present.
•The most important area is the cavosurfacemargin. (2)
- All flash and overhangs should be eliminated.
- The tip of an explorer should pass from the tooth surface to the restoration surface and vice versa without jumping or catching
Finishing older restorations (5)
- Amalgam margins that have expanded beyond the cavosurface
- Margins that were originally undercarved
- 1/3 of the enamel thickness in a localized area can be removed to extend the life of a restoration without replacing it
- Margins with minimal ditching may be refined
- Rough surfaces can be smoothed
Polishing may be done for — reasons only
◦ No longer considered necessary for a well-done amalgam
esthetic
◦ No longer considered necessary for a well-done amalgam
We decide polishing is —
indicated
POLISH AT SLOW SPEED bc
◦ Rubber points may fall apart at high speeds
◦ Tooth may overheat at high temp (May result in pulpal damage
◦ Amalgam may overheat) (Bringing mercury to the surface and increasing likelihood of future amalgam breakdown)
◦ Should obtain smooth surface after only a few seconds of polishing (If not, surface was too rough to polish. Restart finishing procedure from
beginning.)
Placing an Occlusal Restoration: Composite
Technical aspects are very similar (2)
◦ Condense material well into preparation
◦ Restore occlusion
Additional steps:
IN CLINIC:
Acid etch prepared tooth structure
Additional steps:
IN CLINIC AND LAB: (3)
Place bond agent into enamel and dentin
Gently air dry
Light cure
Composite is inserted via — in —
syringe small increments (~2mm or less)
Each increment should be condensed well and then
light cured before adding the next increment.
◦ While condensing composite, “pull back” may occur
After restoring the preparation, the occlusal surface should be shaped using
hand instruments
Placing an Occlusal Restoration: CompositeOperator has control over
composite set up time
◦ Light cure
◦ Composite is completely polymerized (set up)
◦ Ability to polish at the same appointmen
Advantages of composite: (5)
◦ Preparation can be more forgiving ◦ Esthetic ◦ Operator control of set up time ◦ Preserve tooth structure ◦ Don’t need to remove as much for retention (bonds) or bulk of restorative material
Disadvantages of composite: (5)
◦ Technique sensitive restoration ◦ Additional steps ◦ May not last as long ◦ Not as strong ◦ No moisture tolerance
Placing a Class V Restoration Very similar to Class I (3)
◦ Not worried about occlusal anatomy
◦ Focus on making sure restoration is contoured to match original tooth
structure
◦ Overcontoured restoration will be more traumatic to gingiva than
undercontoured restoration
Placing a Class V Restoration ◦ Steps: (3)
◦ 1. Follow same guidelines as occlusal (triturate, use carrier to place, condense well, over fill 1mm)
◦ With this restoration, forces will be going from the buccal surface to the axial wall
◦ 2. Use Hollenback carver to remove excess amalgam
◦ Keeping ends of carver on sound tooth structure, move instrument from distal to mesial
◦ Careful not to gouge restoration, resulting in voids
◦ 3. No need to check occlusion
◦ Polishing usually not necessary, but look how lovely this is!