Retrieval analysis of lingual fixed retainer adhesives.

Gugger, Jonas; Pandis, Nikolaos; Zinelis, Spiros; Patcas, Raphael; Eliades, George; Eliades, Theodore (2016). Retrieval analysis of lingual fixed retainer adhesives. American journal of orthodontics and dentofacial orthopedics, 150(4), pp. 575-584. Elsevier 10.1016/j.ajodo.2016.06.012

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INTRODUCTION Our objective was to analyze the surface and bulk properties alterations of clinically aged composites used for fixed retention. METHODS Twenty-six lingual retainers bonded for different time periods (2.2-17.4 years) were retrieved from postorthodontic patients. Fifteen lingual retainers had been cemented by a chemically cured adhesive (Maximum Cure, Reliance Orthodontic Products, Itasca, Ill), and 11 were treated with a photo-cured adhesive (Flow-Tain, Reliance Orthodontic Products). The first group was in service for 2.8 to 17.4 years and the second for 2.2 to 5.4 years. Five specimens from each material were prepared and used as the control (or reference) group. The debonded surfaces from enamel were studied by attenuated total reflectance Fourier transform infrared spectroscopy (n = 3 per material per group), low-vacuum scanning electron microscopy, and energy dispersive x-ray microanalysis (n = 3 per material per group). All specimens were used for the assessment of Vickers hardness, indentation modulus, and elastic index with the instrumented indentation testing method. The values of Vickers hardness, indentation modulus, and elastic index were compared between the retrieved and the reference groups with 1-way analysis of variance and the Student-Newman-Keuls multiple comparison test (α = 0.05). RESULTS The attenuated total reflectance Fourier transform infrared spectroscopy analysis showed that both retrieved composites demonstrated reduced unsaturation in comparison with the corresponding reference specimens. Some bonded surfaces showed development of organic integuments. All retrieved specimens showed reduced silicon content. Barium was identified only in the photo-cured group. No significant differences were found between the reference and retrieved groups in Vickers hardness, indentation modulus, and elastic index. CONCLUSIONS Despite the changes in composition, the mechanical properties of the materials tested remained unaffected by intraoral aging.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Orthodontics

UniBE Contributor:

Pandis, Nikolaos

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0889-5406

Publisher:

Elsevier

Language:

English

Submitter:

Eveline Carmen Schuler

Date Deposited:

26 Apr 2017 11:53

Last Modified:

26 Apr 2017 11:53

Publisher DOI:

10.1016/j.ajodo.2016.06.012

PubMed ID:

27692414

BORIS DOI:

10.7892/boris.94252

URI:

https://boris.unibe.ch/id/eprint/94252

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