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Influence of loading site and ceramic strength on the failure of teeth restored with ceramic inlays

Authors
 전동근 
Issue Date
2015
Description
Dept. of Dentistry/석사
Abstract
The purpose of this study was to evaluate the influence of ceramic material strength
and loading site on the failure of teeth restored with ceramic inlays using a universal
testing machine.
Ninety intact, caries-free human maxillary premolars were divided randomly into six
groups (n=15): Group 1, Class II mesio-occluso-distal (MOD) cavity preparation and
restoration with IPS Empress CAD and compressive force loaded on inlay; Group 2,
MOD cavity preparation and restoration with IPS e.max CAD and compressive force
loaded on inlay; Group 3, MOD cavity preparation and restoration with IPS Empress
CAD and compressive force loaded on tooth; Group 4, MOD cavity preparation and
restoration with IPS e.max CAD and compressive force loaded on tooth; Group 5, MOD
cavity preparation and no restoration and compressive force loaded on tooth; and Group 6,
intact teeth and compressive force loaded on tooth.
Class II MOD preparation was as follows. The pulpal floor was formed at a depth of 2
mm from the occlusal cavosurface margin of the preparation, and the isthmus was half of
the intercuspal distance. The proximal box width was 1.5 mm, and the axial wall was 2
mm in height. Margins were prepared with 90-degree cavosurface angles.
Specimens were tested in a universal testing machine at 1.0 mm/min using two steel
sphere plungers (3 mm and 6 mm in diameter). Peak load to fracture (N) was measured
for each specimen. Means were calculated and analyzed with a one-way ANOVA and
Tukey’s test (α=0.05).
The mean peak fracture loads (N, mean ± S.D.) were as follows: Group 1 - 689.4 ±
138.3, Group 2 - 813.6 ± 151.8, Group 3 - 1236.0 ± 292.4, Group 4 - 1244.1 ± 379.4,
Group 5 - 822.3 ± 258.6, Group 6 - 1363.0 ± 342.5.
Based on the results obtained under in vitro experimental conditions, the following
conclusions were drawn. The ceramic strength did not statistically influence fracture
resistance. However, the mean fracture load of the IPS e.max CAD inlay was superior to
that of the IPS Empress CAD inlay when the force was loaded on the ceramic restoration.
The main fracture type differed according to the loading site. When force was loaded on
the ceramic inlay, the proximal box fracture was the main type of fracture. When force
was loaded on teeth, the cuspal fracture was the main type of fracture. Future studies on
the failure of teeth restored with inlays should consider the loading site.
Files in This Item:
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Appears in Collections:
2. College of Dentistry (치과대학) > Others (기타) > 2. Thesis
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/145695
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