Evaluation of methods for stain removal in acrylic resin denture teeth: <i>in vitro</i> study

CASSIANO, Ana Flávia Balestrero; LEITE, Andressa Rosa Perin; POLICASTRO, Vivian Barnabé; COMPAGNONI, Marco Antonio; PERO, Ana Carolina

doi:10.1590/1807-2577.24915

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Original Articles • Rev. Odontol. UNESP 45 (4) • Jul-Aug 2016 • https://doi.org/10.1590/1807-2577.24915 copy

Evaluation of methods for stain removal in acrylic resin denture teeth: in vitro study

Avaliação de métodos de remoção de manchas em dentes de resina acrílica para prótese total: estudo in vitro

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

Introduction

The staining of artificial teeth can be related to the acrylic resin abrasion caused by brushing, resulting in higher deposition of dyes from the beverage, and consequently higher aesthetic damage.

Objective

The aim of this in vitro study was to evaluate methods for removal of stains from acrylic denture teeth using spectrophotometric analysis.

Material and method

Artificial teeth were divided into twelve groups (n=10) according to the type of treatment (re-polishing - Re or immersion in Corega Tabs - Sp), staining solutions, coffee (Cf) and Coca-Cola® (Cc) or water (W) and with/without toothbrushing (B). The Sp specimens were submitted to seven immersion cycles (5 min each). The Re specimens were polished with pumice stone followed by Spain white paste. Color differences (ΔE) were captured by a spectrophotometer: T0 (baseline), T1 (after brushing/immersion in solutions) and T2 (after Re or Sp).

Result

Statistically significant color change between T1 and T2 (paired T-test; α =.05) was observed for the group CfSp (p=.032); and for the groups BWRe (p=.000), BCfRe (p=.049) and CcRe (p=.042). Higher color changes were observed for the specimens submitted to toothbrushing (ANOVA two way; p<.001).

Conclusion

It could be concluded that the immersion in sodium perborate (Corega Tabs) can be used for removal of coffee stains from denture teeth, and re-polishing for removal of Coca-Cola® stains. Still, toothbrushing produced greater color changes on denture teeth, regardless of the immersion solution.

Descriptors:
Tooth artificial; denture complete; toothbrushing; color stability

Group	Description
BWSp	Toothbrushing + immersion in water + sodium perborate treatment
BCcSp	Toothbrushing + immersion in cola + sodium perborate treatment
BCfSp	Toothbrushing + immersion in coffee + sodium perborate treatment
WSp	Immersion in water + sodium perborate treatment
CcSp	Immersion in cola + sodium perborate treatment
CfSp	Immersion in coffee + sodium perborate treatment
BWRe	Toothbrushing + immersion in water + re-polishing treatment
BCcRe	Toothbrushing + immersion in cola + re-polishing treatment
BCfRe	Toothbrushing + immersion in coffee + re-polishing treatment
WRe	Immersion in water + re-polishing treatment
CcRe	Immersion in cola + re-polishing treatment
CfRe	Immersion in coffee + re-polishing treatment

Group	L*	a*	b*	T0T1 ΔE	T1T2 ΔE	P
BWSp	80.73	6.85	19.41	5.24(±5.36)	4.27(±2.61)	0.555
BCcSp	81.07	7.43	20.23	2.45(±2.14)	1.91(±1.52)	0.565
BCfSp	80.67	7.51	20.30	2.29(±1.89)	1.74(±1.64)	0.506
WSp	83.03	6.15	19.75	5.55(±4.85)	2.49(±1.70)	0.091
CcSp	80.55	7.36	19.98	4.37(±3.75)	3.90(±3.32)	0.667
CfSp	80.77	7.10	19.76	2.56(±1.98)	1.13(±0.81)	0.032^* * P<0.05: significant difference between groups (paired T-test, α=0.05).
BWRe	79.63	6.49	17.14	5.55(±0.93)	2.16(±1.17)	0.000^* * P<0.05: significant difference between groups (paired T-test, α=0.05).
BCcRe	81.21	7.16	19.14	5.08(±4.42)	3.23(±0.90)	0.214
BCfRe	81.20	7.80	18.79	7.61(±3.32)	4.67(±2.00)	0.049^* * P<0.05: significant difference between groups (paired T-test, α=0.05).
WRe	81.35	7.91	18.62	1.68(±1.28)	1.29(±0.65)	0.304
CcRe	80.80	7.58	19.08	2.93(±2.20)	1.13(±0.63)	0.042^* * P<0.05: significant difference between groups (paired T-test, α=0.05).
CfRe	79.80	7.87	19.01	2.11(±0.52)	2.39(±0.42)	0.206

Group	Perborate sodium	Re-polishing	P
Brushing + immersion in water	4.27(±2.61)	2.16(±1.17)	0.032^* * P<0.05: significant difference between methods (independent T-test, α=0.05).
Brushing + immersion in cola	1.91(±1.52)	3.23(±0.90)	0.029^* * P<0.05: significant difference between methods (independent T-test, α=0.05).
Brushing + immersion in coffee	1.74(±1.64)	4.67(±2.00)	0.002^* * P<0.05: significant difference between methods (independent T-test, α=0.05).
Immersion in water	2.49(±1.70)	1.29(±0.65)	0.052
Immersion in cola	3.90(±3.32)	1.13(±0.63)	0.027^* * P<0.05: significant difference between methods (independent T-test, α=0.05).
Immersion in coffee	1.13(±0.81)	2.39(±0.42)	0.000^* * P<0.05: significant difference between methods (independent T-test, α=0.05).

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[1] CONFLICTS OF INTERESTS The authors declare no conflicts of interest.