Scientific Studies on

VarseoSmile Crown plus

Toothbrush Abrasion

Objective

This study will test the loss of mass and the surface roughness on VarseoSmile Crown plus arising from brushing teeth with an electric toothbrush.

Material and methods

This study examined samples made of VarseoSmile Crown plus as well as samples made of Sinfony* (by 3M*) material. Here, Sinfony was chosen as the comparison material because it is a material that has proven itself in the market for many years, and is used for permanent crown restorations and cured via light.

Discs with a diameter of 15 mm and a height of 3 mm were manufactured for test purposes. In the case of VarseoSmile Crown plus this was done through 3D printing, and in the case of Sinfony it was done by filling a form and allowing it to cure on both sides with a light-curing device, in accordance with manufacturer’s specifications in both cases. Next, one surface of the disc was polished.

The toothbrushing simulation was performed on the polished surfaces in a toothbrushing simulation machine. This test used the electric toothbrush Oral-B Vitality Sensitive Clean* and “elmex cavity-protection toothpaste”*. In the process, the rotational movement of the brushes was overlaid with a lateral movement of the brushes of 5 mm and a speed of 10 mm/s. The pressing force of the toothbrush on the sample was set at 1.5 N.

The toothbrushing simulation was stopped after 15:12 min (1-year simulation), 45:37 min (3-year simulation) and 76:02 min (5-year simulation). Each time, the loss of mass of the samples and the roughness of the sample surface was determined. This was performed under the assumption that the cleaning duration for the entire dentition is of 4 min per day, such that the total cleaning duration for the surface of one tooth totals a good 15 min per year.

Results

The calculated loss of mass, resulting from the toothbrushing simulation, was significantly higher for the samples made of Sinfony material than for those made of VarseoSmile Crown plus, for all three toothbrushing durations. Thus, the mean loss of mass for VarseoSmile Crown plus was 0.08 mg for the 1-year simulation, 0.32 mg for the 3-year simulation, and 0.56 mg for the 5-year simulation. In contrast, the mean loss of mass for Sinfony was almost double for all of these toothbrushing durations (1-year simulation: 0.24 mg; 3-year simulation: 0.76 mg and 5-year simulation: 0.99 mg).

On the other hand, the resulting surface roughnesses for VarseoSmile Crown plus and for Sinfony were almost equal, and for both materials they were independent of the time at which the toothbrushing simulation was stopped and the roughness measured. The mean roughness (R) ascertained for VarseoSmile Crown plus after the 1-year simulation was Ra: 0.09 µm, after the 3-year simulation Ra: 0.10 µm and after the 5-year simulation 0.11 µm. The roughness value for Sinfony after the 1-year simulation was Ra: 0.09 µm, after the 3-year simulation it was 0.10 µm and after the 5-year simulation it was 0.10 µm.

Conclusion

Through the toothbrushing simulation it was possible to demonstrate that crowns made of Sinfony experience significantly greater loss of mass than those made of VarseoSmile Crown plus. Restorations made of VarseoSmile Crown plus are thus preserved for a long time and the existing tooth substance is protected in the best possible manner.

Moreover, the roughness values provide evidence that there is no significant increase in roughness resulting from toothbrushing duration, in the case of both materials. Since the roughness values always remained clearly below the clinically significant threshold of Ra: 0.2 µm, an increased accumulation of plaque on the surface of the tooth restoration is not to be expected.


Toothbrush simulator ZM.3.4

Boxplot/distribution of the measured values of loss of mass

Boxplot/distribution of the measured values of surface roughness


Source

The above information is based on a scientific study of the toothbrush abrasion of
VarseoSmile Crown plus, conducted by:
Niclas Albrecht; SD Mechatronik GmbH, Germany

* This symbol is a commercial designation/registered trademark of a company which is not part of the BEGO company group.