Marginal fit of cemented and screw-retained crowns incorporated on the Straumann (ITI) Dental Implant System: an in vitro study

Tosches, N A; Brägger, U; Lang, N P (2009). Marginal fit of cemented and screw-retained crowns incorporated on the Straumann (ITI) Dental Implant System: an in vitro study. Clinical oral implants research, 20(1), pp. 79-86. Oxford: Wiley-Blackwell 10.1111/j.1600-0501.2008.01591.x

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AIM: The aim of this study was to assess the marginal fit of crowns on the Straumann (ITI) Dental Implant System with special consideration of different casting dental materials. MATERIAL AND METHODS: Sixty porcelain-fused-to-metal crowns were fabricated: 18 crowns on standard cone abutments with an impression cylinder, partially prefabricated analogs, no coping and screw-retained (A); 18 crowns on solid abutments without an impression device, no analogs, no coping and cemented (B); and 18 crowns on solid abutments using an impression transfer cap, an analog with a shoulder, no coping and cemented (C). In each group, six crowns were made on epoxy mastercasts (Bluestar), six on synthetic plaster (Moldasynt) and six on super hard stone (Fujirock). Six additional crowns were fabricated with the transversal screw retention system onto the Octa system with impression transfer caps, metal analogs, gold copings and screw-retained (D). Impregum was used as impression material. Crowns of B and C were cemented with KetacCem. Crowns of A and D were fixed with an occlusal screw torqued at 15 N cm. Crowns were embedded, cut and polished. Under a light microscope using a magnification of x 100, the distance between the crown margin (CM) and the shoulder (marginal gap, MG) and the distance between the CM and the end of the shoulder (crown length, CL) was measured. RESULTS: MGs were 15.4+/-13.2 microm (A), 21.2+/-23.1 microm (B), 11+/-12.1 microm (C) and 10.4+/-9.3 microm (D). No statistically significantly differences using either of the casting materials were observed. CLs were -21.3+/-24.8 microm (A), 3+/-28.9 microm (B), 0.5+/-22 microm (C) and 0.1+/-15.8 microm (D). Crowns were shorter on synthetic casting materials compared with stone casts (P<0.005). CONCLUSIONS: CMs fit precisely with both cemented and screw-retained versions as well as when using no, partial or full analogs.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > School of Dental Medicine > Division of Fixed Prosthodontics [discontinued]
UniBE Contributor:	Tosches, Nino Annibale
ISSN:	0905-7161
Publisher:	Wiley-Blackwell
Language:	English
Submitter:	Eveline Carmen Schuler
Date Deposited:	04 Oct 2013 15:11
Last Modified:	05 Dec 2022 14:21
Publisher DOI:	10.1111/j.1600-0501.2008.01591.x
PubMed ID:	19126111
Web of Science ID:	000262129300012
URI:	https://boris.unibe.ch/id/eprint/31051 (FactScience: 195450)