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Finishing and Polishing Composite Resins


Technique with Aluminum Oxide Cups

Important steps for a successful direct resin restoration are contouring, finishing, and polishing. Proper finishing and polishing greatly improve aesthetics, maximize patients’ oral health,1 and increase the longevity of restorations.2 Unfortunately, the proper sequence of polishing steps necessary to achieve optimum results is often overlooked.3 Proper technique is actually quite simple and extremely efficient once the future practitioner understands the concept behind the finish and polishing process.4,5

Finishers and Polishers Overview  

Different types of composites call for different polishing techniques, depending on the type of restoration and the dentist’s ultimate goals. Available finishers and polishers include diamond impregnated polishers, aluminum-oxide polishing pastes, and aluminum-oxide polishers. Thorough and complete finishing and polishing requires the use of a sequential series of finishing and polishing burs, discs, strips, and pastes. Following the proper sequence of materials ensures the long-term health and polishability of restorations. If a part of this process is skipped, the tooth will often be left rough and susceptible to plaque and staining. Either multi-fluted carbides or fine diamonds for gross contouring can be used to begin finishing the restoration.

Discs can be used for the contouring of all tooth surfaces as well as bulk reduction of excess material. Discs will help contour and finish curved surfaces such as labial proximal line angles, lingual marginal ridges, cervical areas, incisal edges, shaping and finishing of incisal corners, plus finishing and polishing of labial surfaces. They are also excellent for contouring and finishing of posterior marginal ridge areas, and for lingual and buccal surfaces. 

Aluminum-Oxide Discs  

Use of a multi-disc sequence  is designed to gradually reduce the amount of roughness caused by initial abrasion until a smooth glossy tooth surface is achieved. To provide maximum control for the operator, composite finishing should be done under low-speed/high-torque (speed from 0 rpm to 30,000 rpms).

Coarse—The coarse grit is the stiffest of all the discs. This grit is used in conjunction with multi-fluted finishing burs for gross contouring and shaping. When used with pressure, the coarse disc makes it easy to blend the composite into the tooth surface, eliminating the white line and raised margins.

Medium—The medium grit should be used to continue smoothing the restoration surface. Medium grits remove any remaining imperfections and marks. 

Fine—This part of the grit sequence is where polish really starts to shine through. The fine grit helps remove the smallest imperfections while adding a nice luster to the restoration.

Superfine—The superfine grit further refines the surface smoothness attainable to create a highly polished restoration.

Diamond strips help start the inter- proximal finishing process while maintaining the integrity of the interproximal contact. A larger-grit (45-µm strip) should be used for interproximal stripping of natural teeth or for gross removal of material, and smaller grits (15 µm and 30 µm) should be used to start interproximal polishing.

Aluminum oxide strips should be used to contour and polish interproximal areas. Use of a high-quality strip will remove tenacious stains and create a high polish at the interproximal without damaging the soft tissue. It is important that the strip is thin and will stay intact as it is drawn through the interproximal contact areas.

Aluminum-oxide cups should be used to polish gingival margins, achieve labial characterization and anatomy, and effectively reach areas such as the gingival third and the gingival margins of anterior teeth. Aluminum-oxide points should be used to create labial grooves in veneers, to finish and polish occlusal surfaces of posterior teeth, and on lingual surfaces of anterior teeth.

An aluminum-oxide polishing paste should be used as the last step in the finishing and polishing process. Polishing paste with felt discs and points can be used to bring out the final beautiful polish of composites, metals, porcelain, or natural dentition after prophylaxis.

 

Conceptualization  

Before finishing and polishing, the dentist must conceptualize the desired end result. The dentist will not have to work as hard to obtain lifelike results if the restoration is pre-contoured to the correct shape and form before polishing. Many practitioners lose the shape of the restoration because of a lack of attention to the material application phase. Many dentists have a tendency to over-bulk the composite, and end up losing the intended shape. It is much easier to obtain the desired result if the composite is initially placed into the correct anatomical form and only slightly over-contour from the facial aspect.

 

Technique  

Finishing and polishing should be achieved with a low-speed, high-torque handpiece, typically anywhere from 7,000 rpm to 30,000 rpm. A high-speed handpiece may be used to pre-contour, but using anything over 30,000 rpm during finishing and polishing is too high. Low-speed, high-torque is preferable, because it gives the operator complete control.

The best finishing and polishing technique depends on the type of restoration the dentist is presented with. When polishing a Class IV restoration, for instance, the dentist should rely mainly on discs. However, cups and points will help develop more realistic characterization when polishing a veneer. A step-by-step guide to polishing on various restorations is outlined below. 

Class III, IV, and Diastema Closures  

Starting with a coarse disc or a carbide-finishing bur, the restoration can be completely contoured moving from restorative material to tooth surface, similar to burnishing metal. This can be done in a wet or dry field. The material should be extended well past the long bevel, and the dentist should not come back to the beveled margin. The final restoration should be feather-edged onto the tooth surface past the beveled margin. If done properly, any white line or raised margin will completely disappear. At this stage, the disc should be flexed for maximum finishing potential.

The different grit sizes—medium, fine, and superfine—should be continued through in succession. An enamel-like luster rapidly appears. The interproximal process should be started with diamond strips to maintain the integrity of the contact. One or two times through the interproximal should be sufficient, followed with the fine-superfine aluminum oxide strip on dry surface until no resistance is felt, and a smooth surface is apparent. For the final polish, an aluminum oxide polishing paste with felt discs and points should be used. This is the step that really brings out the amazing final polish. 

Class V  

On occlusal or incisal margins, 5/8” or 1/2” coarse disc should be used past the long bevel. Discs are always preferred on exposed margins. To start finishing from restoration to tooth surface, a coarse disc is used, followed by medium and then fine; finishing with the superfine disc to achieve maximum polish. The 3/8” disc should be used at the gingival margin. Although this is a small diameter, the 3/8” disc can be flexed to gain access to hard-to-reach areas. The gingival half of the restoration can be polished nicely using flexible cups, but rubber must be kept off the occlusal and incisal margins.

If Class V restoration invades the proximal surfaces, the diamond strips and aluminum oxide strips should be used in the narrow width for polishing these surfaces. An aluminum-oxide polishing paste with felt discs and points is recommended for the final polish.

Full Resin-Bonded Veneer  

The coarse disc or contouring bur is used to start contouring and finishing. The coarse and medium discs can be used to complete the contouring of the veneer. It is desirable to maintain the character and anatomy placed in the facial surface. This cannot be done with discs, but cups and points are very useful for this purpose. To characterize, the cup is placed flat on the tooth surface, flexed slightly, and run with pressure up and down the tooth surface. Blunting off sharp edges on a green stone prior to characterizing prevents scarring and over-characterization.

After a grooved surface has been developed, augmenting with rubber points highlights the grooves. Polishing the surface is completed with fine and then superfine polishing discs. To polish the interproximal surfaces, diamond and aluminum-oxide strips are used as previously described. For the final polish, an aluminum-oxide polishing paste with felt discs and points is used. 

 

Conclusion  

The proper contouring, finishing, and polishing of anterior restorations is a key component to the long-term success of bonded restorations. First, the appropriate restorative materials, from composites to polishers, must be carefully selected to help get the job done right. Then, the dentist must conceptualize the desired end result, and set up the restoration accordingly. And, finally, the proper finishing and polishing technique must be executed in order to achieve maximum restorative success.

 

References  

1. Jefferies SR. Abrasive finishing and polishing in restorative dentistry: a state-of-the-art review. Dent Clin North Am 2007;51(2):379-397.

2. Turkun LS, Turkun M. The effect of one-step polishing system on the surface roughness of three esthetic resin composite materials. Oper Dent. 2004;29(2):203-211.

3. Mopper KW. How do composite resins stand the test of time? Dent Today. 2004;23(5):74-79.

4. Mopper KW. Let’s talk composites! Dent Today. 2008;27(10):120-122.

5. Craig RG, Ward ML (eds). Restorative Dental Materials. Mosby, St. Louis, 1997,p263.

 

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