Effect of power toothbrushing on simulated wear of dental cement margins.
Power toothbrushes (PTBs), in combination with abrasive dentifrices, may encourage wear of dental cements at crown margins.


OBJECTIVE
The objective of this in vitro simulation was to control the clinical variables associated with PTB use and measure the potential side effects of PTBs with mild and abrasive dentifrices.


METHODS
Four PTBs ( Braun-Oral-B-Professional Care at 150 g brushing force, Sonicare-Elite at 90 g, Colgate-Actibrush at 200 g and Crest-Spinbrush-Pro at 250 g) and 2 dentifrices mixed 1:1 with tap water (Mild= Colgate-Total, Colgate-Palmolive; Abrasive= Close-up, Chesebrough-Ponds) versus tap water alone (control) were used to abrade 2 cements (Fleck's Mizzy Zinc Phosphate [ZP]; 3M-ESPE Unicem universal cement [UC]) using cement-filled slots (160 m wide) cut into wear-resistant ceramic blocks. A custom fixture controlled PTB/block alignment, PTB loads, and other testing variables. Wear was measured (3 profilometer traces/slot, 5 slots/block/group, baseline to 5-year differences) and analyzed (3-way ANOVA, p < or = 0.05, Bonferroni).


RESULTS
Wear for ZP was much greater than UC (p<0.05) for all 4 PTBs and both dentifrices. Brushing with water showed no effects (p<0.05). Cement-PTB-dentifrice interactions did occur. Only minor differences occurred among PTBs. Pooled 5y-wear levels for ZP for both dentifrices approximately 21 microm /5y) were similar to values for current-day posterior composite materials.


CONCLUSIONS
Combinations of PTBs with mild and abrasive dentifrices produced significant wear with ZP but not UC; thus, resin-composite cements seem to represent a better choice for wear resistance.
Black
Marsha A
MA
University of Missouri-Kansas City School of Dentistry, Kansas City, MO, USA. futuredentist72@yahoo.com
Bayne
Stephen C
SC
Peterson
Charlotte A
CA
D000704:Analysis of Variance; D003442:Crowns; D003742:Dental Devices, Home Care; D019554:Dental Restoration Wear; D003802:Dentifrices; D004560:Electricity; D019279:Resin Cements; D014099:Toothbrushing / Q000295:instrumentation*; D015036:Zinc Phosphate Cement
D003802:Dentifrices; C483701:Rely X Unicem; D019279:Resin Cements; D015036:Zinc Phosphate Cement