CLASS II RESINS
denture tooth modification, and other procedures. Using a sterilized,
dull bur guarantees production of the dreaded “white line” around
The following burs do not need to be new, since they are cutting
primarily resin and not tooth structure. The 7901 is used to remove
occasional gingival overhangs, and the 7801 is used to place grooves
and sluiceways in the resin. The rotary finishing instruments should
be used at low speed with loupes on—preferably in an electric handpiece
without water spray, which eliminates optimum vision—and with a
very light shaving touch to avoid margin damage.
A small tooth preparation made with a 329 bur and a restoration
finished in the above-described manner is shown in Figure 5.
Class II resin-based composites are bread-and-butter procedures for
general dentists. They can be accomplished relatively fast, and they can
be predictable, nonsensitive, and profitable, assuming dental assistants
and dentists are coordinated in their knowledge about the materials and
techniques required. The procedures included in this column will improve
the predictability and longevity of Class II composites for you.
Figure 4: Twelve-bladed trimming and
finishing burs or similar size diamond
rotary instruments are the primary
finishing instruments for Class II resins.
Used properly, they can produce
excellent resin surfaces without the
presence of a “white line”—mutilated
tooth structure and composite—on
the restoration margins.
Author’s note: Additional educational information from Dr. Gordon J.
Christensen, Practical Clinical Courses:
Two-day courses in Utah
• Implant Surgery—Level 1: September 29–30, 2017
• Restorative Dentistry 2—Fixed Prosthodontics: October 13–14, 2017
• Class II Composite Resins Can Be Predictable, Non-Sensitive, and
Profitable: Item No. V3554
• Mastering Frequent Esthetic Challenges with Resin: Item No. V3582
• Top Insurance Coding Strategies: Item No. V4783
• Avoiding Common Administrative Errors: Item No. V4784
Figure 5: Tooth preparations should be made as minimal as possible, such
as the ones in the premolar made with a 329 bur. Proper finishing and
polishing can produce restorations that will serve patients for many years.
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