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[Layer thickness of dental adhesives. Relation between layer thickness and viscosity]
R H Kuijs1, R C Burgersdijk, F J Roeters
1Sector Preventieve en Curatieve Tandheelkunde, Katholieke Universiteit Nijmegen, postbus 9101, 6500 HB Nijmegen.
Objective:
To investigate the viscosity of two dental adhesives in relation to the adhesive layer thickness.
Design:
In vitro study.
Methods:
The viscosity of several dental adhesives has been determined with a reogoneometer. Both a high and a low viscous adhesive was used to restore class II preparations. These restorations were sectioned and the thickness of the adhesive layer was measured on several defined locations. A statistical analysis was performed.
Results:
The high viscous adhesive resulted in a thinner layer along the cervical outline of the restoration. With both materials pooling occurred at the line angles of the preparation. On the flat surfaces of the preparations there was a layer of even thickness.
Conclusion:
The differences in thickness of the adhesive layer as often seen on radiographs cannot be explained solely by the use of adhesives with a different viscosity.
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