Journalartikel
Autorenliste: Balkenhol, Markus; Haunschild, Sylvia; Erbe, Christina; Woestmann, Bernd
Jahr der Veröffentlichung: 2010
Seiten: 288-294
Zeitschrift: The Journal of Prosthetic Dentistry
Bandnummer: 103
Heftnummer: 5
ISSN: 0022-3913
DOI Link: https://doi.org/10.1016/S0022-3913(10)60060-1
Verlag: Elsevier
Statement of problem. Upon removal, tear forces occur in various areas of an impression. As a result, thin sulcus details may be permanently deformed, affecting the impression's accuracy. Purpose. The purpose of this study was to investigate the effect of the chemistry and prolonged setting time on the permanent deformation of light-body impression materials after stretching. Material and methods. A dumbbell-shaped mold (2 mm x 4 mm x 75 mm) was used to prepare specimens (n=20) of 6 different impression materials (Affinis Light Body, Aquasil Ultra XLV, Express 2 Light Body Flow Quick, Flexitime Correct Flow, P2 Polyether Light, and lmpregum Garant L DuoSoft). After water storage (35 degrees C), either for the manufacturer's suggested setting time or for 5 minutes, specimens were stretched by 80% using a universal testing machine at a crosshead speed of 200 mm/min. The permanent deformation (Delta l (%)) was determined after 2 hours of storage in ambient conditions. A 2-way ANOVA followed by a Games-Howell test was used to analyze the influence of material and storage time (alpha=.05). Results. Polyether materials showed a significantly higher permanent deformation (Delta l>4% to 5%) than vinyl polysiloxane materials (P9.05). Extending the manufacturer's suggested setting time resulted in clinically relevant improvements in elastic recovery for products with a polyether backbone only. Conclusions. Increasing the setting time might be necessary for impression materials with a polyether backbone to improve elastic recovery. (J Prosthet Dent 2010;103:288-294)
Abstract:
Zitierstile
Harvard-Zitierstil: Balkenhol, M., Haunschild, S., Erbe, C. and Woestmann, B. (2010) INFLUENCE OF PROLONGED SETTING TIME ON PERMANENT DEFORMATION OF ELASTOMERIC IMPRESSION MATERIALS, The Journal of Prosthetic Dentistry, 103(5), pp. 288-294. https://doi.org/10.1016/S0022-3913(10)60060-1
APA-Zitierstil: Balkenhol, M., Haunschild, S., Erbe, C., & Woestmann, B. (2010). INFLUENCE OF PROLONGED SETTING TIME ON PERMANENT DEFORMATION OF ELASTOMERIC IMPRESSION MATERIALS. The Journal of Prosthetic Dentistry. 103(5), 288-294. https://doi.org/10.1016/S0022-3913(10)60060-1
Schlagwörter
DIMENSIONAL ACCURACY; Elastic recovery; POLYETHER; POLYSULFIDE; RELEVANT; SILICONE; VISCOELASTIC PROPERTIES