Correlation of the mechanical and biological response in light-cured RBCs to receiving a range of radiant exposures: Effect of violet light.

Ilie, Nicoleta; Schmalz, Gottfried; Fujioka-Kobayashi, Masako; Lussi, Adrian; Price, Richard Bengt (2021). Correlation of the mechanical and biological response in light-cured RBCs to receiving a range of radiant exposures: Effect of violet light. Journal of dentistry, 105, p. 103568. Elsevier Science 10.1016/j.jdent.2020.103568

[img] Text
1-s2.0-S030057122030316X-main.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (2MB)

OBJECTIVE

This study correlates the mechanical and biological response of commercially available resin-based composites (RBCs) to clinically relevant light-curing conditions.

METHODS

Two RBCs (Venus and Venus Pearl; Kulzer) that use different monomer and photo-initiator systems, but have a similar filler volume and shade, were exposed to either just blue light, or violet and blue light from two different LCUs (Translux Wave and Translux 2Wave; Kulzer). Distance and exposure times were adjusted so that both LCUs delivered 5 similar levels of radiant exposures (RE) between 1.5 J/cm²-25 J/cm² in the blue wavelength range. Thus, the violet light was additional light. The top and bottom of 2-mm thick specimens were subjected to a depth-sensing indentation test (Martens hardness/HM, Vickers hardness/HV, indentation modulus/YHU, mechanical work/Wtotal, plastic deformation work/Wplas, creep/Cr). The viability of human gingival fibroblasts was assessed after three days of exposure to RBC eluates. One and multiple-way analysis of variance (ANOVA), the Tukey honestly significant difference (HSD) post-hoc tests (α = 0.05), t-test and a Spearman correlation analysis were used.

RESULTS

As the RE increased, the mechanical properties increased at a greater rate at the top compared to the bottom of the RBCs. Values measured at the bottom of 2-mm increments approached the values measured at the top only when RE > 25 J/cm² of blue light was delivered. Toxicity decreased with RE and elution cycles and was lower for Venus Pearl. Within one RE level, addition of violet light resulted in significantly improved properties (in 131 out of 150 comparisons, p < 0.05). This effect was stronger for Venus Pearl. There was a good correlation between mechanical and biological parameters. This correlation decreased as the number of eluates increased.

CLINICAL SIGNIFICANCE

The mechanical and biological response to variation in RE is interrelated. The addition of violet light has a positive effect, particularly at low RE.

Item Type:

Journal Article (Original Article)

Division/Institute:

?? DCD5A442BA03E17DE0405C82790C4DE2 ??
04 Faculty of Medicine > School of Dental Medicine
04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Craniomaxillofacial Surgery
?? DCD5A442C386E17DE0405C82790C4DE2 ??
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Schädel-, Kiefer- und Gesichtschirurgie
04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DBMR Forschung Mu35 > Forschungsgruppe Schädel-, Kiefer- und Gesichtschirurgie

04 Faculty of Medicine > School of Dental Medicine > Research

UniBE Contributor:

Kobayashi, Masako (B), Lussi, Adrian

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0300-5712

Publisher:

Elsevier Science

Language:

English

Submitter:

Doris Burri

Date Deposited:

31 Jan 2022 09:59

Last Modified:

29 Mar 2023 23:38

Publisher DOI:

10.1016/j.jdent.2020.103568

PubMed ID:

33385531

Uncontrolled Keywords:

Cell viability Hardness Indentation modulus Light curing units Resin-based composite

BORIS DOI:

10.48350/163991

URI:

https://boris.unibe.ch/id/eprint/163991

Actions (login required)

Edit item Edit item
Provide Feedback