Wear of posterior metal-free polymer crowns after 2 years

Summary  The objective of this study was to evaluate the clinical wear behaviour of posterior, metal‐free polymer crowns and to compare it with that of metal‐ceramic crowns. After randomization, a total of 120 single crowns were set in posterior teeth. These 120 crowns were divided into three groups...

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Bibliographic Details
Published in:Journal of oral rehabilitation 2008-10, Vol.35 (10), p.782-788
Main Authors: OHLMANN, B., TRAME, J.-P., DREYHAUPT, J., GABBERT, O., KOOB, A., RAMMELSBERG, P.
Format: Article
Language:English
Subjects:
Adult
Aged
clinical
Crowns
Dental Occlusion
Dental Prosthesis Design
Dental Restoration Wear
Dentistry
Female
Glass
Humans
Male
Materials Testing - methods
Metal Ceramic Alloys
Middle Aged
polymer
Polymers
Prospective Studies
randomized
wear
Young Adult
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Summary:Summary  The objective of this study was to evaluate the clinical wear behaviour of posterior, metal‐free polymer crowns and to compare it with that of metal‐ceramic crowns. After randomization, a total of 120 single crowns were set in posterior teeth. These 120 crowns were divided into three groups: 40 polymer crowns with a glass‐fibre framework (group 1), 40 polymer crowns without framework stabilization (group 2) and 40 metal‐ceramic crowns (control group). Wear was measured by use of gypsum replicas and a 3D laser scanner at baseline and after 2 years. Statistical analysis was performed by use of a mixed‐effects regression model. The mean total wear of posterior single crowns was −19·0 μm (± 18·5 μm) in group 1, −24·3 μm (± 31·5 μm) in group 2 and −7·0 μm (± 8·8 μm) in the control group. Statistical analysis revealed the mean total wear of the polymer crowns in groups 1 (P ≤ 0·01) and 2 (P ≤ 0·01) was significantly greater than in the control group. No significant difference was detected between groups 1 and 2 (P = 0·58). Age, gender and opposing teeth had no significant effect on wear behaviour.
ISSN:0305-182X
1365-2842
DOI:10.1111/j.1365-2842.2008.01865.x