Celin Joel, C (2020) Effect of Different Surface Preparations on the Bonding of a Gingival Shade Composite to Denture Base Resin Before and After Thermocycling: An Invitro study. Masters thesis, Rajas Dental College and Hospital, Tirunelveli.
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Abstract
BACKGROUND: Gingival shade composite is used for gingival characterization in the PMMA denture bases. The success of gingival shade composite lies in the bond strength to the acrylic base, and adequate aesthetics. Newer and improved techniques are needed to improve this bonding. Aging of dental materials in the oral cavity is an important factor which influences the mechanical and physical properties of the materials. Artificial aging is possible through thermal cycling. AIM OF THE STUDY: To evaluate the effect of three types of surface coatings on the bond strength of a gingival shade composite resin to PMMA resin before and after thermocycling. MATERIALS AND METHODS: A total of 80 block specimens (10 × 10 × 10 mm3) of heat processed PMMA is prepared (n=20). The 80 block specimens were divided into four groups of 20 specimens each. GROUP 1: Control, GROUP 2: 4- Meta, GROUP 3: Light polymerized composite primer, GROUP 4: Silane coupling agents. After processing each specimen is finished using abrasives and irregularities are removed. Bonding of PMMA and Gingival shade composite is done using acryl ring and light polymerization is done according to the manufacturer instructions. The forty specimens are taken from the four groups as ten specimens from each group and thermocycling is done in water between 50 C and 550 C for 1000 cycles with a dwell time of 30 seconds at each temperature. Mechanical testing is done using Instron Universal Testing Machine (Model3345) with 100 N load and a cross head speed of 0.5 mm/min. The means and standard deviations are calculated and statistically analysed with one way ANOVA and Post Hoc Comparison test- Tukey HSD with the significance level set at 0.05 RESULTS: Before thermocycling, the 4 META resin specimens recorded the highest value at 39.97 Mpa followed by composite primer 35.09 Mpa, silane coupling agent 28.59 Mpa and control 18.48 Mpa respectively. After thermocycling, 4 META recorded the highest value at 27.76 Mpa followed by composite primer 19.05 Mpa, silane coupling agent 9.47 Mpa and control 6.42 Mpa respectively. There was statistically significant differences among all groups before and after thermocycling. CONCLUSION: Within the limitations of this study, the following conclusions were drawn. The surface preparation with light activated 4- META resin resulted in the highest shear bond strength values with denture base resins before and after thermocycling followed by composite primer, silane coupling agent and control.
| Item Type: | Thesis (Masters) |
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| Additional Information: | 241711201 |
| Uncontrolled Keywords: | Bonding, Denture Base Resin, Gingival Shade Composite Resin, Surface Preparation, Thermocycling. |
| Subjects: | DENTAL > Prosthodontics and Crown and Bridge |
| Depositing User: | Subramani R |
| Date Deposited: | 21 Feb 2021 01:48 |
| Last Modified: | 21 Feb 2021 03:34 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/14329 |
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