Survival of inlays and partial crowns made of IPS empress after a 10-year observation period and in relation to various treatment parameters

Stoll, R., Cappel, I., Jablonski-Momeni, A., Pieper, K., and Stachniss, V. (2007) Survival of inlays and partial crowns made of IPS empress after a 10-year observation period and in relation to various treatment parameters. Operative Dentistry, 32 (6). pp. 556-563.

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Abstract

This study evaluated the long-term survival of inlays and partial crowns made of IPS Empress. For this purpose, the patient data of a prospective study were examined in retrospect and statistically evaluated.

Materials and methods: All of the inlays and partial crowns fabricated of IPS-Empress within the Department of Operative Dentistry at the School of Dental Medicine of Philipps University, Marburg, Germany were systematically recorded in a database between 1991 and 2001. The corresponding patient files were revised at the end of 2001. The information gathered in this way was used to evaluate the survival of the restorations using the method described by Kaplan and Meyer.1

Results: A total of n=1624 restorations were fabricated of IPS-Empress within the observation period. During this time, n=53 failures were recorded. The remaining restorations were observed for a mean period of 18.77 months. The failures were mainly attributed to fractures, endodontic problems and cementation errors. The last failure was established after 82 months. At this stage, a cumulative survival probability of p=0.81 was registered with a standard error of 0.04. At this time, n=30 restorations were still being observed. Restorations on vital teeth (n=1588) showed 46 failures, with a cumulative survival probability of p=0.82. Restorations performed on non-vital teeth (n=36) showed seven failures, with a cumulative survival probability of p=0.53. Highly significant differences were found between the two groups (p<0.0001) in a log-rank test. No significant difference (p=0.41) was found between the patients treated by students (n=909) and those treated by qualified dentists (n=715). Likewise, no difference (p=0.13) was established between the restorations seated with a high viscosity cement (n=295) and those placed with a low viscosity cement (n=1329).

Item ID: 17732
Item Type: Article (Refereed Research - C1)
ISSN: 1559-2863
Date Deposited: 18 Aug 2011 06:59
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1105 Dentistry > 110501 Dental Materials and Equipment @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920402 Dental Health @ 100%
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