Journal List > J Korean Acad Prosthodont > v.48(4) > 1034638

Lee, Jeong, Choi, Hwang, and Lee: The effects of polishing technique and brushing on the surface roughness of acrylic resin

Abstract

Purpose

This study evaluated the effect of polishing techniques on surface roughness of polymethyl methacrylate (PMMA), as well as the influence of light-cured surface glaze and subsequent brushing on surface roughness.

Materials and methods

A total of 60 PMMA specimens (10×10×5 mm) were made and then divided into 6 groups of 10 each according to the polymerization methods (under pressure or atmosphere) and the surface polishing methods (mechanical or chemical polishing) including 2 control groups. The mechanical polishing was performed with the carbide denture bur, rubber points and then pumice and lathe wheel. The chemical polishing was performed by applying a light-cured surface glaze (Plaquit®; Dreve-Dentamid GmbH). Accura 2000°, a non-contact, non-destructive, optical 3-dimensional surface analysis system, was used to measure the surface roughness (Ra) and 3-dimensional images were acquired. The surface roughness was again measured after ultrasonic tooth brushing in order to evaluate the influence of brushing on the surface roughness. The statistical analysis was performed with Mann-Whitney test and t-test using a 95% level of confidence.

Results

The chemically polished group showed a statistically lower mean surface roughness in comparison to the mechanically polished group (P = .0045) and the specimens polymerized under the atmospheric pressure presented a more significant difference (P = .0138). After brushing, all of the groups, except the mechanically polished group, presented rougher surfaces and showed no statistically significant differences between groups.

Conclusion

Although the surface roughness increased after brushing, the chemical polishing technique presented an improved surface condition in comparison to the mechanical polishing technique. (J Korean Acad Prosthodont 2010;48:287-93)

REFERENCES

1.Christensen GJ. The fastest and best provisional restorations. J Am Dent Assoc. 2003. 134:637–9.
crossref
2.De Rouck T., Collys K., Wyn I., Cosyn J. Instant provisionalization of immediate single-tooth implants is essential to optimize esthetic treatment outcome. Clin Oral Implants Res. 2009. 20:566–70.
crossref
3.Block MS., Mercante DE., Lirette D., Mohamed W., Ryser M., Castellon P. Prospective evaluation of immediate and delayed provisional single tooth restorations. J Oral Maxillofac Surg. 2009. 67:89–107.
crossref
4.Quirynen M., Marechal M., Busscher HJ., Weerkamp AH., Darius PL., van Steenberghe D. The influence of surface free energy and surface roughness on early plaque formation. An in vivo study in man. J Clin Periodontol. 1990. 17:138–44.
crossref
5.Taylor R., Maryan C., Verran J. Retention of oral microorganisms on cobalt-chromium alloy and dental acrylic resin with different surface finishes. J Prosthet Dent. 1998. 80:592–7.
crossref
6.Radford DR., Sweet SP., Challacombe SJ., Walter JD. Adherence of Candida albicans to denture-base materials with different surface finishes. J Dent. 1998. 26:577–83.
crossref
7.Quirynen M., Bollen CM. The influence of surface roughness and surface-free energy on supra- and subgingival plaque formation in man. A review of the literature. J Clin Periodontol. 1995. 22:1–14.
8.Bollen CM., Lambrechts P., Quirynen M. Comparison of surface roughness of oral hard materials to the threshold surface roughness for bacterial plaque retention: a review of the literature. Dent Mater. 1997. 13:258–69.
9.Herrgott AM., Ziemiecki TL., Dennison JB. An evaluation of different composite resin systems finished with various abrasives. J Am Dent Assoc. 1989. 119:729–32.
crossref
10.Lutz F., Phillips RW. A classification and evaluation of composite resin systems. J Prosthet Dent. 1983. 50:480–8.
crossref
11.McLundie AC., Murray FD. Comparison of methods used in finishing composite resin—a scanning electron microscope study. J Prosthet Dent. 1974. 31:163–71.
crossref
12.Heath JR., Wilson HJ. Surface roughness of restorations. Br Dent J. 1976. 140:131–7.
crossref
13.Loney RW., Moulding MB., Hacker CH., Ritsco RG. Finishing and polishing of a poly (fluoroalkoxyphosphazene) resilient denture liner. Int J Prosthodont. 1994. 7:362–7.
14.Maalhagh-Fard A., Wagner WC., Pink FE., Neme AM. Evaluation of surface finish and polish of eight provisional restorative materials using acrylic bur and abrasive disk with and without pumice. Oper Dent. 2003. 28:734–9.
15.de Gee AJ. Some aspects of vacuum mixing of composite resins and its effect on porosity. Quintessence Int Dent Dig. 1979. 10:69–74.
16.Finger W., Jorgensen KD. Porosity of composite filling materials. SSO Schweiz Monatsschr Zahnheilkd. 1977. 87:482–9.
17.Lambrechts P., Vanherle G. The use of glazing materials for finishing dental composite resin surfaces. J Oral Rehabil. 1982. 9:107–17.
crossref
18.Stoddard JW., Johnson GH. An evaluation of polishing agents for composite resins. J Prosthet Dent. 1991. 65:491–5.
crossref
19.Budtz-Jo ¨rgensen E., Kaaber S. Clinical effects of glazing denture acrylic resin bases using an ultraviolet curing method. Scand J Dent Res. 1986. 94:569–74.
20.Kuhar M., Funduk N. Effects of polishing techniques on the surface roughness of acrylic denture base resins. J Prosthet Dent. 2005. 93:76–85.
crossref
21.Neme AM., Wagner WC., Pink FE., Frazier KB. The effect of prophylactic polishing pastes and toothbrushing on the surface roughness of resin composite materials in vitro. Oper Dent. 2003. 28:808–15.
22.Cho LR., Yi YJ., Heo SJ. Effect of tooth brushing and thermal cycling on a surface change of ceromers finished with different methods. J Oral Rehabil. 2002. 29:816–22.
crossref

Fig. 1.
Accura 2000å, a non-contact, non-destructive, optical 3-dimensional surface analysis system.
jkap-48-287f1.tif
Fig. 2.
A: Surface analysis of mechanical polishing group before brushing, B: Surface analysis of chemical polishing (glazing) group before brushing.
jkap-48-287f2.tif
Fig. 3.
Surface analysis of chemical polishing (glazing) of atmosphere polymerization group. A: Before brushing, B: After 3 minutes brushing, C: After 6 minutes brushing.
jkap-48-287f3.tif
Fig. 4.
A: Surface roughness (Ra) of pressure polymerization groups, B: Surface roughness (Ra) of atmosphere polymerization groups.
jkap-48-287f4.tif
Table 1.
Groups according to the polymerized condition and polishing techniques
Group   N Polymerized condition Finishing & polishing
P-group PC 10 Pressure pot (170 kPa), Room temperature, 100% humidity no
PM 10   carbide bur, rubber point, pumice
PG 10   carbide bur, Plaquit®
A group AC 10 Atmospheric pressure, Room temperature, 100% humidity no
AM 10   carbide bur, rubber point, pumice
AG 10   carbide bur, Plaquit®
Table 2.
Means and SDs in parenthesis of surface roughness (Ra) (unit: μ m
Group   Polishing Brushing-3 min Brushing-6 min
P group PC 0.428 (0.270) 1.209 (0.278) 1.400 (0.357)
  PM 1.107 (0.484) 1.350 (0.393) 1.382 (0.431)
  PG 0.444 (0.286) 0.740 (0.315) 1.315 (0.456)
A group AC 0.942 (0.388) 1.096 (0.425) 1.332 (0.480)
  AM 1.182 (0.875) 1.485 (0.528) 1.541 (0.438)
  AG 0.424 (0.172) 0.880 (0.266) 1.281 (0.410)

A; atmosphere, C; control, G; glazing, M; mechanical, P; pressure pot

Table 3.
Results of statistical analysis (P- value)
  Polishing Brushing-3 min Brushing- 6 min
PM vs. PG .0045c .0051a 1.0000c
AM vs. AG .0138a .0138c .5538c
PC vs. AC .0029b .4880b .7227b
PM vs. AM 1.0000a 1.0000a 1.0000c
PG vs. AG 1.0000c .8961c 1.0000c

a: Mann-Whitney test with Bonferroni's correction b: t-test c: t-test with Bonferroni's correction P-value < .05 level was considered significant.

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