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. 2016 Feb;8(1):43-52.
doi: 10.4047/jap.2016.8.1.43. Epub 2016 Feb 23.

Wear of primary teeth caused by opposed all-ceramic or stainless steel crowns

Jae-Won Choi  1 , Ik-Hyun Bae  2 , Tae-Hwan Noh  3 , Sung-Won Ju  4 , Tae-Kyoung Lee  5 , Jin-Soo Ahn  4 , Tae-Sung Jeong  3 , Jung-Bo Huh  1
Affiliations

Wear of primary teeth caused by opposed all-ceramic or stainless steel crowns

Jae-Won Choi et al. J Adv Prosthodont. 2016 Feb.

Abstract

Purpose: This study was conducted to evaluate the effects of full-coverage all-ceramic zirconia, lithium disilicate glass-ceramic, leucite glass-ceramic, or stainless steel crowns on antagonistic primary tooth wear.

Materials and methods: There were four study groups: the stainless steel (Steel) group, the leucite glass-ceramic (Leucite) group, the lithium disilicate glass-ceramic (Lithium) group, and the monolithic zirconia (Zirconia) group. Ten flat crown specimens were prepared per group; opposing teeth were prepared using primary canines. A wear test was conducted over 100,000 chewing cycles using a dual-axis chewing simulator and a 50 N masticating force, and wear losses of antagonistic teeth and restorative materials were calculated using a three-dimensional profiling system and an electronic scale, respectively. Statistical significance was determined using One-way ANOVA and Tukey's test (P<.05).

Results: The Leucite group (2.670±1.471 mm(3)) showed the greatest amount of antagonist tooth wear, followed by in decreasing order by the Lithium (2.042±0.696 mm(3)), Zirconia (1.426±0.477 mm(3)), and Steel groups (0.397±0.192 mm(3)). Mean volume losses in the Leucite and Lithium groups were significantly greater than in the Steel group (P<.05). No significant difference was observed between mean volume losses in the Zirconia and Steel groups (P>.05).

Conclusion: Leucite glass-ceramic and lithium disilicate glass-ceramic cause more primary tooth wear than stainless steel or zirconia.

Keywords: Leucite porcelain; Lithium disilicate porcelain; Primary tooth; Wear; Zirconia.

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Figures

Fig. 1
Fig. 1. Preparation of tooth specimens.
Fig. 2
Fig. 2. Preparation of the restorative material specimens. (A) Steel: stainless steel, (B) Leucite: leucite glass-ceramic, (C) Lithium: lithium disilicate glass-ceramic, (D) Zirconia: monolithic zirconia.
Fig. 3
Fig. 3. (A) Antagonistic tooth and (B) a restorative material embedded in an acrylic resin fixed into sample holders. (C) A specimen fixed to the sample holder in a special chamber.
Fig. 4
Fig. 4. (A) STL files of tooth specimens before the wear test, (B) STL files of the same tooth specimens after the test, (C) Overlapping of the STL files of the tooth specimens before and after testing, (D) STL files of the worn region.
Fig. 5
Fig. 5. Volumetric loss mean values (mm3) and standard deviations for antagonistic teeth, and mean weight losses (g) and standard deviations of tested materials after wear testing (Steel: stainless steel; Leucite: leucite glassceramic; Lithium: lithium disilicate glass-ceramic; and Zirconia: monolithic zirconia).
Fig. 6
Fig. 6. Representative SEM images of primary tooth surfaces (Steel: stainless steel; Leucite: leucite glass-ceramic; Lithium: lithium disilicate glass-ceramic; Zirconia: monolithic zirconia group; and *: abraded tooth area).
Fig. 7
Fig. 7. Representative SEM images of the specimen surfaces (Steel: stainless steel; Leucite: leucite glass-ceramic; Lithium: lithium disilicate glass-ceramic; Zirconia: monolithic zirconia group; I: intact area; and A: abraded surface).
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