Ultrasonically set glass polyalkenoate cements for orthodontic applications.
There is an accepted clinical requirement for a luting cement that can be command set upon satisfactory placement of an orthodontic appliance onto dentition. This work evaluates the suitability of ultrasound, imparted from a dental scaler, as a potential mechanism for achieving this. The net setting times and subsequent compressive strengths of a range of commercial and experimental glass polyalkenoate cements (GPCs) were evaluated, using modified ISO 9917 methods, when set both chemically and by ultrasound. The ultrasound was applied to the GPC through an orthodontic brace. It was possible to command set GPCs by the application of five to ten seconds of ultrasound; the exact time required being dependent upon the composition of the GPC in question. The compressive strengths of these cements can be improved by around 90% with the command set when the optimum PAA molecular weight and tartaric acid content is employed.
Tanner
D A
DA
Materials and Surface Science Institute, University of Limerick, National Technological Park, Limerick, Ireland.
Rushe
N
N
Towler
M R
MR
D000268:Adhesiveness / Q000528:radiation effects; D002484:Cementation / Q000379:methods*; D019245:Compressive Strength / Q000528:radiation effects; D003738:Dental Cements / Q000032:analysis* / Q000737:chemistry* / Q000528:radiation effects; D005899:Glass Ionomer Cements / Q000032:analysis* / Q000737:chemistry* / Q000528:radiation effects; D006244:Hardness / Q000528:radiation effects; D006245:Hardness Tests; D008422:Materials Testing; D009970:Orthodontics / Q000379:methods*; D013718:Tensile Strength / Q000528:radiation effects; D014465:Ultrasonics
D003738:Dental Cements; D005899:Glass Ionomer Cements