Performance of Multiple Emission Peak Light Emitting Diode Light Curing Unit: Degree of Conversion and Microhardness of Resin-Based Pit and Fissure Sealant
dc.contributor.advisor | Soto, Armando E. | |
dc.contributor.author | Ba Armah, Ibrahim | |
dc.contributor.other | Platt, Jeffrey A. | |
dc.contributor.other | Al Dehailan, Laila A. | |
dc.date.accessioned | 2022-07-21T17:48:06Z | |
dc.date.available | 2022-07-21T17:48:06Z | |
dc.date.issued | 2022-07 | |
dc.degree.date | 2022 | en_US |
dc.degree.discipline | School of Dentistry | en |
dc.degree.grantor | Indiana University | en_US |
dc.degree.level | M.S.D. | en_US |
dc.description.abstract | Background: The light-cured resin-based pit and fissure sealants success and longevity are enhanced by sufficient curing. Multiple emission peak Light Emitting Diode Light Curing Units offer a wider range of wavelengths and different levels of irradiances to ensure sufficient curing.The irradiance is considered a main curing factor that can affect the material properties. Purpose: The aim of this study was to assess the effect of different settings of a multiwave LED LCU on the degree of conversion and microhardness of a pit and fissure sealant comparing the irradiance of 1000 mW/cm2 to 1400 mW/cm2 and 3200 mW/cm2 irradiances of the LCU using manufacturer’s guidelines for curing times at 2, 4 and, 6 mm distances. Methods: A multiwave LED light curing unit was evaluated on three different irradiance levels 1000 mW/cm2 (S), 1400 mW/cm2 (H), and 3200 mW/cm2 (X). A total of 90 samples made from the fissure sealant were fabricated and divided into eighteen groups (n=5/group). Samples were cured following manufacturer’s guidelines of curing times for each curing mode at 2, 4, or 6 mm distance between the light tip and top of samples. The DC was measured using (ATR-FTIR) spectroscopy. The KHN test was performed on five different locations of each specimen using a hardness tester (Leco LM247AT, MI, USA, software; Confident V 2.5.2). Results: The top DC for H-8 was significantly higher than S-10 at 2 and 4mm, H-20 DC was significantly lower than S-30 at only 2mm. The bottom DC for H-8 was significantly higher than S-10 at 2mm only, H-20 DC was significantly lower than S-30 at 4 and 6mm only. H-8 KHN at top surface was significantly lower than S-10 at 2mm only, H-20 was significantly lower than S-30 at 2 and 6mm only. H-8 KHN at bottom surface was significantly lower than S-10 at 4 and 6mm but significantly higher at 2mm. H-20 was significantly lower than S-30 at 2mm but significantly higher at 4 and 6mm. The top DC for X-3 was significantly lower than S-10 at all curing distances with no significant difference at all curing distances between X-9 and S-30. The bottom DC for X-3 was significantly higher than S-10 at all curing distances with no significant difference between X-9 and S-30. X-3 KHN at top surface was significantly lower than S-10s at all curing distances. X-9 was significantly lower than S-30 at 6mm only. X-3 KHN at bottom surface was significantly lower than S-10 at 2 and 4mm only with no significant difference at all curing distances between X-9 and S-30. Conclusions: Using a multiwave LED LCU to polymerize Delton Opaque resin-based fissure sealants will result in an optimal DC and KHN values for any irradiance level if the curing distance is kept at 4 mm or less and with at least two cycles of the shortest curing time recommended by the manufacturer. Using a multiwave LED LCU with 1000, 1400 or 3200 mW/cm2 irradiance levels with shortest curing times recommended resulted in unsatisfactory DC and KHN levels. LED LCU with high and extra high irradiance levels (1400 and 3200 mW/cm2) can result in high DC and KHN levels when used adequately. Xtra Power mode (3200 mW/cm2) used on shortest curing time (3 seconds) resulted in significantly lower mechanical properties and for that reason it is not recommended to be used. | en_US |
dc.identifier.uri | https://hdl.handle.net/1805/29621 | |
dc.identifier.uri | http://dx.doi.org/10.7912/C2/2970 | |
dc.language.iso | en_US | en_US |
dc.subject | LED LCU | en_US |
dc.subject | Degree of conversion | en_US |
dc.subject | Microhardness | en_US |
dc.subject | Resin-based pit & fissure sealant | en_US |
dc.subject.mesh | Curing Lights, Dental | en |
dc.subject.mesh | Light-Curing of Dental Adhesives | en |
dc.subject.mesh | Pit and Fissure Sealants | en |
dc.subject.mesh | Composite Resins | en |
dc.subject.mesh | Polymerization | en |
dc.subject.mesh | Bisphenol A-Glycidyl Methacrylate | en |
dc.title | Performance of Multiple Emission Peak Light Emitting Diode Light Curing Unit: Degree of Conversion and Microhardness of Resin-Based Pit and Fissure Sealant | en_US |
dc.type | Thesis | en |