Vaibhavi, T (2020) Effect of Preheating and Radiant Exposure on Degree of Conversion and Microhardness of Bulk Fill Composites: An Invitro study. Masters thesis, Adhiparasakthi Dental College and Hospital, Melmaruvathur.
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Abstract
AIM OF THE STUDY: Aim of this study is to assess and compare the effect of preheating and variant radiant exposure on the degree of conversion and microhardness of three different bulk fill composites. MATERIALS AND METHODS: In this study 3 different bulk fill composites, Filtek TM Bulk Fill-3M, SureFil SDR flow-Dentsply, PalfiqueR Bulk Flow- Tokuyama, were selected. Twenty-eight composite discs of 4mm thickness were prepared for each bulk fill composite. According to the method of polymerization four groups were formed, Group1: High intensity, No preheating the composite (n=7 per composite), Group 2: High intensity, Preheating the composite (n=7 per composite), Group 3: Normal intensity, No preheating the composite (n=7 per composite). All the samples were cured according to their respective parameters and degree of conversion and microhardness were determined by using Fourier Transform Infrared Spectroscopy (FTIR) and Vickers’s microhardness test respectively. STATISTICAL ANALYSIS AND RESULTS: The statistical analysis was performed using SPSS software. A multivariate ANOVA (MANOVA) was done with 3 independent variables namely, intensity of curing light, preheating the composite and type of composite and 4 dependent variables namely Microhardness on top and bottom surface and Degree of conversion on top and bottom surface of the composite samples. The combined values of dependent variables were used to assess the characteristic of composite. CONCLUSION: Within the limitations of the study it was concluded that all the three types of bulk fill composites achieved significant microhardness and degree of conversion with the high intensity and preheating parameters.
| Item Type: | Thesis (Masters) |
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| Additional Information: | 241717502 |
| Uncontrolled Keywords: | Preheating and Radiant Exposure, Degree of Conversion, Microhardness, Bulk Fill Composites. |
| Subjects: | DENTAL > Conservative Dentistry and Endodontics |
| Depositing User: | Subramani R |
| Date Deposited: | 22 Feb 2021 17:20 |
| Last Modified: | 23 Feb 2021 01:09 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/14421 |
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