Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light Curing Units
Background and Aim: The use of light emitting diode (LED) light curing units has recently increased due to optimal properties such as longer durability, no need for filter and less heat generation compared to quartz tungsten halogen (QTH) devices. The aim of this study was to assess the shear bond s...
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| Format: | Article |
| Language: | English |
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Islamic Dental Association of Iran
2015-10-01
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| Series: | Journal of Islamic Dental Association of Iran |
| Subjects: | |
| Online Access: | http://jidai.ir/browse.php?a_code=A-10-1-836&slc_lang=en&sid=1 |
| _version_ | 1818271756010389504 |
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| author | Mansoreh Mirzaee Esmaeil Yassini Mohammad Javad Kharazifard Mehrnaz Vaziri |
| author_facet | Mansoreh Mirzaee Esmaeil Yassini Mohammad Javad Kharazifard Mehrnaz Vaziri |
| author_sort | Mansoreh Mirzaee |
| collection | DOAJ |
| description | Background and Aim: The use of light emitting diode (LED) light curing units has recently increased due to optimal properties such as longer durability, no need for filter and less heat generation compared to quartz tungsten halogen (QTH) devices. The aim of this study was to assess the shear bond strength of composite to dentin following lightcuring with QTH and LED light curing units for different time periods.
Materials and Methods: In this experimental study, 60 sound extracted human molar and premolar teeth with no decay or restorations were collected. The buccal surface of the teeth was ground to expose adequate amount of dentin. The teeth were randomly divided into six groups. After acid etching and bonding, composite was packed in plastic cylindrical molds and placed on dentin surface. Groups one, two and three were cured by a LED unit (Wood Pecker) with ramp method for 20, 30 and 40 seconds, respectively. Groups four, five and six were cured with a QTH unit (Optilux 501) with a light intensity of 500 mW/cm2 for 20, 30 and 40 seconds, respectively. After keeping the samples for two weeks in distilled water at room temperature, shear bond strength was measured by a universal testing machine at a crosshead speed of 1mm/minute. The data were analyzed by Two-way ANOVA, one-way ANOVA and Tukey’s HSD test.
Results: One-way ANOVA showed a significant difference among the groups and the mean shear bond strength was the highest following light curing by LED device for 40 seconds (18.63 MPa). Pairwise comparisons by Tukey’s test showed significant differences in shear bond strength of groups cured with LED unit (P= 0.059 for the difference between 20 seconds and 40 seconds and P=0.004 for the difference between 30 seconds and 40 seconds).
Conclusion: Use of LED units (ramp method) yielded superior results in terms of shear bond strength compared to QTH. Also, 40 seconds of curing is recommended in use of LED devices. |
| first_indexed | 2024-12-12T21:31:13Z |
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| id | doaj.art-4728c39addd24bc5a9a2fe2c69dcf84f |
| institution | Directory Open Access Journal |
| issn | 2383-3041 2383-3041 |
| language | English |
| last_indexed | 2024-12-12T21:31:13Z |
| publishDate | 2015-10-01 |
| publisher | Islamic Dental Association of Iran |
| record_format | Article |
| series | Journal of Islamic Dental Association of Iran |
| spelling | doaj.art-4728c39addd24bc5a9a2fe2c69dcf84f2022-12-22T00:11:19ZengIslamic Dental Association of IranJournal of Islamic Dental Association of Iran2383-30412383-30412015-10-01274168172Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light Curing UnitsMansoreh Mirzaee0Esmaeil Yassini1Mohammad Javad Kharazifard2Mehrnaz Vaziri3 Assosiated Professor, Dental Research Center, Dentistry Research Institute, Department of Restorative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Professor, Dental Research Center, Dentistry Research Institute, Department of Restorative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Research Member, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran Dentist, Private Office, Ahvaz, Iran Background and Aim: The use of light emitting diode (LED) light curing units has recently increased due to optimal properties such as longer durability, no need for filter and less heat generation compared to quartz tungsten halogen (QTH) devices. The aim of this study was to assess the shear bond strength of composite to dentin following lightcuring with QTH and LED light curing units for different time periods. Materials and Methods: In this experimental study, 60 sound extracted human molar and premolar teeth with no decay or restorations were collected. The buccal surface of the teeth was ground to expose adequate amount of dentin. The teeth were randomly divided into six groups. After acid etching and bonding, composite was packed in plastic cylindrical molds and placed on dentin surface. Groups one, two and three were cured by a LED unit (Wood Pecker) with ramp method for 20, 30 and 40 seconds, respectively. Groups four, five and six were cured with a QTH unit (Optilux 501) with a light intensity of 500 mW/cm2 for 20, 30 and 40 seconds, respectively. After keeping the samples for two weeks in distilled water at room temperature, shear bond strength was measured by a universal testing machine at a crosshead speed of 1mm/minute. The data were analyzed by Two-way ANOVA, one-way ANOVA and Tukey’s HSD test. Results: One-way ANOVA showed a significant difference among the groups and the mean shear bond strength was the highest following light curing by LED device for 40 seconds (18.63 MPa). Pairwise comparisons by Tukey’s test showed significant differences in shear bond strength of groups cured with LED unit (P= 0.059 for the difference between 20 seconds and 40 seconds and P=0.004 for the difference between 30 seconds and 40 seconds). Conclusion: Use of LED units (ramp method) yielded superior results in terms of shear bond strength compared to QTH. Also, 40 seconds of curing is recommended in use of LED devices.http://jidai.ir/browse.php?a_code=A-10-1-836&slc_lang=en&sid=1Shear StrengthComposite ResinsCuring LightsDental |
| spellingShingle | Mansoreh Mirzaee Esmaeil Yassini Mohammad Javad Kharazifard Mehrnaz Vaziri Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light Curing Units Journal of Islamic Dental Association of Iran Shear Strength Composite Resins Curing Lights Dental |
| title | Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light
Curing Units |
| title_full | Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light
Curing Units |
| title_fullStr | Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light
Curing Units |
| title_full_unstemmed | Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light
Curing Units |
| title_short | Shear Bond Strength of Composite to Dentin following Light Curing with Light Emitting Diode and Quartz Tungsten Halogen Light
Curing Units |
| title_sort | shear bond strength of composite to dentin following light curing with light emitting diode and quartz tungsten halogen light curing units |
| topic | Shear Strength Composite Resins Curing Lights Dental |
| url | http://jidai.ir/browse.php?a_code=A-10-1-836&slc_lang=en&sid=1 |
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