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Lichthärtender glasionomerzement als bracketkleber bei unterschiedlicher schmelzkonditionierung

Light-cured glass lonomer cements as a bracket adhesive with different types of enamel conditioners

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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie Aims and scope Submit manuscript

Zusammenfassung

80 Rinderfrontzähne wurden mit Siliziumkarbidschleifpapier (320er Körnung) plangeschliffen und die Schmelzoberflächen mit fluoridfreier Prophylaxepaste poliert. Die Schmelzoberflächen der einzelnen Gruppen wurden wie folgt konditioniert: 1. Keine Konditionierung; 2. Salicylsäure (10%, 10 s); 3. Benzoesäure (10%, 10 s); 4. Bestrahlung mit Natriumhydrogencarbonat/Prophy-Jet®; 5. Prophy-Jet®, anschließend 10%ige Polyacrylsäure (PAS); 6. PAS, anschließend Speichelkontamination; 7. PAS; 8. Phosphorsäure (37%). Als Bracketkleber in Gruppe 1 bis 7 diente Fuji Ortho II LC® (GC), in der Kontrollgruppe Concise orthodontic® (3M). Per Hand wurden Stahllingualknöpfchen positioniert. Die Polymerisation erfolgte für je 20 s von inzisal, mesial, gingival und distal mit sichtbarem Licht. Nach 24 Stunden Lagerung in Wasser (23°C) wurde die Scherfestigkeit entsprechend ISO-Spezifikation Entwurf TC 106/SC2/WG16 getestet. Die Scherkräfte wurden mittels Student-test verglichen und auf Signifikanz geprüft. Die höchste mittlere Scherfestigkeit (im Vergleich zur Kontrollgruppe) wurde in Gruppe 1 (PAS, 28 MPa) erreicht. Diese unterschied sich sowohl signifikant (p=0,04) von der Kontrollgruppe (Concise®, 33 MPa) als auch hochsignifikant von den restlichen Gruppen (<16 MPa). Die Scherfestigkeit von Fuji Ortho II LC® bei Schmelzkonditionierung mit Polycrylsäure legt die klinische Verwendung dieses Materials als Bracketkleber nahe.

Summary

Eighty bovine incisors were ground on 320-grit sillicone carbide paper and cleaned with fluoride-free prophylaxis paste. The enamel surface conditions were: 1. no conditioning; 2. salicylic acid (10%, 10 s); 3. benzoic acid (10%, 10 s); 4. airpolishing with sodium hydrogen carbonate/Prophy-Jet®; 5. Prophy-Jet®, followed by polyacrylic acid (PAA, 10%, 10 s); 6. PAA, followed by saliva contamination; 7. PAA; 8. phosphoric acid (37%, 10 s). Fuji Ortho II LC® (GC) was used as a bracket adhesive in groups 1 to 7, and in group 8 Concise® orthodontic (3M). Stainless steel lingual buttons were placed by hand. Polymerisation with visible light was carried out 20 s from mesial, distal, incisal and gingival. After 24 h storage in tap water at room temperature the shear bond strengths were tested in accordance with ISO specification TC 106/SC/WG16. Mean values of the groups were compared using Student's t-test. Group 7 (PAA) attained the highest mean shear strength (in comparison with control group): 28 MPa. This was both significantly different from the control group (Concise®, 33 MPa) and highly significant in comparison with the other groups (<16 MPa). The shear bond strength of Fuji Ortho II LC® on PAA conditioned enamel indicates the clinical applicability of this material.

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Authors and Affiliations

  1. Abteilung für Kieferorthopädie und Orthodontie, Universitätsklinikum Charité, Zentrum für Zahnmedizin, Föhrer Straße 13, D-13353, Berlin

    U. Süßenberger & P. G. Jost-Brinkmann

  2. Royal Dental College, Department of Orthodontics, University of Aarhus, Dänemark

    V. Cacciafesta

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  3. P. G. Jost-Brinkmann
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Süßenberger, U., Cacciafesta, V. & Jost-Brinkmann, P.G. Lichthärtender glasionomerzement als bracketkleber bei unterschiedlicher schmelzkonditionierung. J Orofac Orthop / Fortschr Kieferorthop 58, 174–180 (1997). https://doi.org/10.1007/BF02676549

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