Color and translucency of milled polymethyl methacrylate crowns on non-tooth-colored interim abutments with different surface treatments.

Cakmak, Gülce; Cuellar, Alfonso Rodriguez; Treviño Santos, Alejandro; Johnston, William M; Dönmez, Mustafa Borga; Yilmaz, Burak (2022). Color and translucency of milled polymethyl methacrylate crowns on non-tooth-colored interim abutments with different surface treatments. (In Press). The journal of prosthetic dentistry Elsevier 10.1016/j.prosdent.2022.01.005

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STATEMENT OF PROBLEM

The interim rehabilitation of implants has become a necessity, particularly for those placed in the esthetic regions. However, the optical properties of computer-aided design and computer-aided manufacturing (CAD-CAM) polymethyl methacrylate (PMMA) crowns on interim abutments with different surface treatments are unclear.

PURPOSE

The purpose of this in vitro study was to investigate the color and translucency of CAD-CAM PMMA crowns when different surface treatments were used on titanium interim abutments.

MATERIAL AND METHODS

A maxillary dentate stone cast with a narrow-diameter implant analog at the left lateral incisor site was used. Three titanium interim abutments (blue) were divided into 3 groups according to the surface treatment they received: control (steam cleaning), opaqued (120-μm Al2O3 airborne-particle abrasion and opaque application), and airborne-particle abraded (120-μm Al2O3). Thirty PMMA crowns (A2 shade) were milled (n=10). The color coordinates of the crown-interim abutment pairs and a shade tab (A2) were measured by using a colorimeter. The color differences (ΔE00) between the crowns and the shade tab and the relative translucency parameter (RTP) values of the crowns were calculated by using the CIEDE2000 formula. One-way ANOVA was used to analyze the ΔE00 and RTP values with subsequent Tukey honestly significant difference tests (α=.05).

RESULTS

The abutment surface treatment significantly affected the ΔE00 of interim crowns from the shade tab (P<.001), but no significant effect was found on RTP (P=.26). The control group had the highest ΔE00 from the shade tab (P≤.011). No significant difference (P=.14) was found between the opaqued and the ΔE00 of the airborne-particle abraded groups from the shade tab.

CONCLUSIONS

The surface treatments of interim abutments affected the color of CAD-CAM PMMA crowns, which differed from that of the shade tab. The color of crowns on opaqued or airborne-particle abraded interim abutments was closer to the color of the shade tab. Abutment surface treatments did not affect the translucency of crown-interim abutment pairs.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Preventive, Restorative and Pediatric Dentistry
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04 Faculty of Medicine > School of Dental Medicine

UniBE Contributor:

Cakmak, Gülce; Dönmez, Mustafa-Borga and Yilmaz, Burak

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1097-6841

Publisher:

Elsevier

Language:

English

Submitter:

Pubmed Import

Date Deposited:

29 Mar 2022 10:36

Last Modified:

29 Mar 2022 10:45

Publisher DOI:

10.1016/j.prosdent.2022.01.005

PubMed ID:

35341600

BORIS DOI:

10.48350/168276

URI:

https://boris.unibe.ch/id/eprint/168276

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