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Two‐body and three‐body wear of glass ionomer cements
Author(s) -
Kunzelmann K.H.,
Bürkle V.,
Bauer C.
Publication year - 2003
Publication title -
international journal of paediatric dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.183
H-Index - 62
eISSN - 1365-263X
pISSN - 0960-7439
DOI - 10.1046/j.1365-263x.2003.00499.x
Subject(s) - glass ionomer cement , molar , dentistry , significant difference , medicine , nuclear chemistry , chemistry
Summary. Objectives. Glass ionomer cements (GIC) have been modified in an attempt to improve their mechanical properties. The objective of the present paper was to compare the two‐body and three‐body wear of four modified GIC. The tested materials were Fuji IX (GC Corporation), Hi‐Fi (Shofu) and Ketac Molar Aplicap (3M/ESPE). The cermet cement Ketac Silver Maxicap (3M/ESPE) was used as reference material. Methods. Two‐body wear tests were carried out in the computer controlled ‘artificial mouth’ of the Munich Dental School, three‐body wear was tested with the ACTA wear machine. Results. The resulting average two‐body wear rates (in µm) were: Fuji IX 327 (SD ± 82) < Ketac Molar 379 (SD ± 94) < Hi‐Fi 376 (SD ± 90) < Ketac silver 449 (SD ± 127). The differences between the materials were significant ( P < 0·05, anova , modified LSD‐test) with the exception of Ketac Molar and Hi‐Fi. The average three‐body wear rates (in µm) were: Hi‐Fi 30 (SD ± 10) < Ketac Molar ± 42 (SD ± 12) < Fuji IX 49 (SD ± 14) < Ketac silver 73 (SD ± 23). The difference between Ketac silver and the three other materials was significant ( P < 0·05, anova , modified LSD‐test). No significant difference was calculated between Hi‐Fi, Ketac Molar and Fuji IX. Conclusions. As Ketac Molar, Hi‐Fi and Fuji IX show better wear resistance compared to Ketac silver both in occlusal‐contact and contact‐free areas, it may be assumed that the wear resistance of a glass ionomer cement may be improved more by changing the powder : liquid ratio than by incorporating silver particles into the glass powder.