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pubmed-article:16922744pubmed:issue9lld:pubmed
pubmed-article:16922744pubmed:dateCreated2006-8-22lld:pubmed
pubmed-article:16922744pubmed:abstractTextThis in vitro study evaluated the failure load of partial coverage restorations (PCR) made of various materials cemented on natural molars after exposure to the mastication simulator. Sixty-four maxillary molars were divided into four groups of 16 test specimens each. The specimens in one group remained unprepared (group NP); the teeth in the other groups were prepared equally according to standardized guidelines and restored with the following PCR: Group GO (Gold-Pontor-MPF; Metaux Precieux SA, Metalor, Neuchatel, Switzerland), group TA (Targis; Ivoclar Vivadent AG, Schaan, Liechtenstein) and group EM (IPS-Empress; Ivoclar Vivadent AG). The restorations in group GO were cemented conventionally, while those in groups TA and EM were luted adhesively. Groups NP and GO served as control groups. All test specimens were subjected to 1.2 million cycles (F = 49 N) in a mastication simulator. Subsequently, all test specimens were loaded occlusally until fracture occurred using an universal testing machine. All specimens withstood the masticating simulation. The median (IQR = x(0.25)-x(0.75)) failure loads were as follows: group NP: 1960.3(1480.5-2227.5) N, group TA: 1478.6(1293.4-1856.7) N and group EM: 1400.1(1043.1-1721.6) N. All test specimens of group GO achieved fracture strength values which exceeded a fracture load of 5500 N. The values of group GO were statistically significantly higher than those of groups NP, TA and EM (P < 0.00001). Furthermore, the results of group NP were significantly higher (P = 0.0226) than those of group EM. The results of groups NP and TA (P = 0.2022) as well as of groups TA and EM (P = 0.5340) did not differ significantly. The median values of all PCR systems obtained were within the limits of clinical acceptance. Long-term clinical investigations which take additional parameters into consideration are required before the composite-based Targis(R) (Ivoclar Vivadent AG) material can be recommended for indirect PCR.lld:pubmed
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pubmed-article:16922744pubmed:authorpubmed-author:StrubJ RJRlld:pubmed
pubmed-article:16922744pubmed:authorpubmed-author:GerekMMlld:pubmed
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pubmed-article:16922744pubmed:volume33lld:pubmed
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pubmed-article:16922744pubmed:pagination698-705lld:pubmed
pubmed-article:16922744pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:16922744pubmed:year2006lld:pubmed
pubmed-article:16922744pubmed:articleTitlePartial coverage restoration systems on molars--comparison of failure load after exposure to a mastication simulator.lld:pubmed
pubmed-article:16922744pubmed:affiliationDepartment of Prosthodontics, Faculty of Dentistry, Albert-Ludwigs-University, Freiburg, Germany. christian.stappert@nyu.edulld:pubmed
pubmed-article:16922744pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:16922744pubmed:publicationTypeComparative Studylld:pubmed