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Fit of 4-unit FDPs from CoCr and zirconia after conventional and digital impressions.

Abstract：

OBJECTIVES:To evaluate the marginal and internal fit of CAD/CAM-generated frameworks for 4-unit, fixed dental prostheses (FDPs) from zirconia (Z) and cobalt-chromium alloy (C) made with conventional (CI) and digital impressions (DI). MATERIALS AND METHODS:A titanium model was digitized with an intraoral scanner (DI, LAVA™ C.O.S.; 3M ESPE; Seefeld, Germany; n = 12). Additionally, 12 conventional impressions were taken, and referring plaster casts were digitized by a laboratory-scanner (CI, LAVA™ Scan ST; 3M ESPE; n = 12). Frameworks were fabricated (3M ESPE) from cobalt-chromium (DI-C, n = 12; CI-C, n = 12) and zirconia (DI-Z, n = 12; CI-Z, n = 12) from the same datasets. A replica technique was applied to measure the accuracy. The Mann-Whitney U statistical test was applied to detect statistical differences between each material and methodology groups in terms of fit. RESULTS:Frameworks from DI-C (median 19.07 μm) showed significantly better marginal fit than CI-C (median 64.64 μm, p < 0.001). Frameworks from DI-Z (median 52.50 μm) showed significantly better marginal fit than CI-Z (median 72.94 μm, p = 0.001). Additionally, frameworks from DI-C showed a significantly better marginal fit than DI-Z (p < 0.001). CONCLUSIONS:CI and DI led to a clinically acceptable marginal fit of 4-unit FDPs from cobalt-chromium and zirconia. DI leads to better marginal fit of the cobalt-chromium frameworks; however, no effect on zirconia was found. CLINICAL RELEVANCE:The results indicate that DI is suitable for fabricating 4-unit, cobalt-chromium and zirconia frameworks with regard to fit requirements.

journal_name

Clin Oral Investig

journal_title

Clinical oral investigations

authors

Ueda K,Beuer F,Stimmelmayr M,Erdelt K,Keul C,Güth JF

doi

10.1007/s00784-015-1513-5

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

283-9

issue

2

eissn

1432-6981

issn

1436-3771

pii

10.1007/s00784-015-1513-5

journal_volume

20

pub_type

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