Die in vivo antibakterielle Wirkung von Kupfer in einem zahnärztlichen Zinkoxid-Phosphatzement
In vivo antibacterial activity of copper in a zinc phosphate dental cement
by Felix Malinski
Date of Examination:2017-05-09
Date of issue:2017-04-24
Advisor:Prof. Dr. Ralf Bürgers
Referee:Prof. Dr. Annette Wiegand
Referee:Prof. Dr. Dr. Karl Günter Wiese
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Abstract
English
Antibacterial additives of medical biomaterials have been introduced as a promising approach to reduce the risk of infection. The aim of this study was to investigate antimicrobial effects of copper in a dental zinc phosphate cement under oral conditions using a realistic in-situ-model. Twenty volunteers (10, female, 10 male, average age 26 years) participated in this clinical trial and were divided into two groups with 10 volunteers each (5 male, 5 female). One group 1 received divided specimens (n= 40), one half made of dental zinc phosphate cement containing copper (Hoffmann´s Kupfer Cement) the other half made of conventional zinc-phosphate cement (Hoffmann´s Cement). The group 2 was treated with specimens (n=40) completely made of phosphate cement containing copper or conventional phosphate cement. Four sspecimens were fixed on custom made splints and exposed to the oral cavity for 12 h. Bacterial morphology and biofilm accumulation were determined by scanning electron microscopy (SEM). Furthermore elementary composition of both cements was analyzed by energy dispersive X-ray spectroscopy (EDX). The average biofilm accumulation of all specimens varied from 35-55%. There was no significant difference between both tested cements in both groups (G1: p= 0.4, G2p= 0.7). Age and gender had an influence on the biofilm accumulation in both groups (G1p <0.001, G2p< 0.001) Young female volunteers showed less biofilm accumulation. The EDX-Analysis showed typical elementary composition for both cements. There was no significant difference concerning the copper concentration in both test cements detectable by EDX-Analyses. In conclusion, copper in the tested cement had no remarkable antimicrobial effect and influence on biofilm accumulation.
Keywords: cement; antibacterial; copper; in vivo