Bhuvaneshwaran, T (2018) Comparison of shear bond strength of two orthodontic bonding systems used for bonding ceramic brackets (Polycrystalline) to zirconia surfaces: An Invitro study. Masters thesis, Tamilnadu Government Dental College and Hospital, Chennai.
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Abstract
AIM OF THE STUDY: To evaluate efficiency of two bonding systems namely, i) Self-etching primer and ii) Total etch system , used to bond ceramic brackets to zirconia crowns. OBJECTIVES: 1. To find shear bond strengths while using the two bonding systems for bonding ceramic brackets to zirconia surfaces. 2. To find Adhesive remnant index score upon debonding, after using the two bonding systems. MATERIALS AND METHODS: • Polycrystalline ceramic brackets. (3M Unitek, Monrovia, Calfornia, USA) • Zirconia blocks (3 mm thickness / 10 x 12 mm dimension) –total 24 surfaces.(IPS e.max ZIRCAD). • Acrylic blocks – 1.5x1.5x4 cms dimension. • Scotchbond- Universal-(3M Unitek Monrovia,Calfornia,USA) • Transbond XT- Single bond-(3M Unitek Monrovia,Calfornia, USA). • Ceramic primer--(3M Unitek Monrovia,Calfornia, USA). • Hydrofluoric acid(Ultradent). • visible light curing unit (CU 100 A, Densply). • Composite (Transbond XT -3M Unitek Monrovia, Calfornia, USA). • Saliva substitute (ICPA health products, India) • Instron universal testing machine - Load cells available 100 N, 1 KN and 100 KN Stereo microscope X 40 magnification. (LEICA-M). SUMMARY AND CONCLUSION: Adult orthodontics is becoming more popular in present times. Since prosthetic restorations with ceramic crowns are also witnessed more frequently, the need to bond ceramic brackets onto ceramic crowns have become a necessity. It is important to have a good bond strength for efficient treatment delivery. Since studies reporting about bond strengths of total etch and self etching systems, when used for bonding ceramic brackets to ceramic surfaces are sparse, this in vitro study was conducted to evaluate the bond strength of the two different orthodontic bonding systems, namely Total etch & self etch systems used for bonding ceramic brackets to zirconia surfaces. Zirconia slabs were embedded onto acrylic blocks and ceramic brackets were bonded on them using both total and self etching systems. The bond strengths of the two groups were tested. In addition, the adhesive remnants on the zirconia surfaces upon debonding were also evaluated, using stereo microscope. The following conclusions were made: 1. The mean shear bond strength of self etch system was 6.2MPa, which was adequate enough to provide good bond strength. 2. The mean shear bond strength of Total etch system was 5.6MPa, which was marginally lesser than the required bond strength. 3. The self etching system had a higher bond strength as compared to the Total etch system, though statistically insignificant. 4. The adhesive remnant index for self etch ARI score of ‘0’ on 66% and 83% of surfaces when total etch system and self etch system were used respectively. 5. Considering the other reported advantages of self etching system to be minimizing bonding steps, time consumption and ability to bond on wet surfaces adequately, the self etching system appears to be preferable to total etch system for bonding ceramic brackets on zirconia crowns.
| Item Type: | Thesis (Masters) |
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| Uncontrolled Keywords: | Comparison ; shear bond strength ; two orthodontic bonding systems ; bonding ceramic brackets ; Polycrystalline ; zirconia surfaces ; Invitro study. |
| Subjects: | DENTAL > Orthodontics and Dentofacial Orthopedics |
| Depositing User: | Subramani R |
| Date Deposited: | 14 Oct 2018 19:06 |
| Last Modified: | 14 Oct 2018 19:06 |
| URI: | http://repository-tnmgrmu.ac.in/id/eprint/9888 |
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