Abstract
Back ground: Reduction of a durable bond to acrylic denture base is the main problem associated with soft liner materials.
 Purpose: Evaluation of the influence of addition of Ag-Zn Zeolite on shear bond strength of silicon cold cure soft liner.
 Approach: thirty specimens of silicon cold cure soft liner were constructed for shear bond- strength test and divided into three groups: Control groups: 10 specimens without incorporation of Ag-Zn Zeolite, Experimental group: 10 specimens with 0.5% by weight of Ag-Zn Zeolite Experimental Group: 10 specimens with 0.75 %by weight of Ag-Zn Zeolite Plastic pattern of acrylic block with dimensions (75 mm length x 25mm width x 5mm depth )was fabricated and evaluated by Instron testing machine.
 Results: Least significant difference of (0.75%) of Ag-Zn zeolite group was significantly different compared with the experimental group of (0.5% and control group) at p<0.05.
 Conclusion: The incorporation of 0.5%, 0.75% by weight into silicon cold cure soft liner had significant effect and causes improvement in shear bond strength.
Highlights
The resorption of alveolar bone might cause poor adaptation of the prosthesis that causes discomfort for patients
The Fourier transfer infrared spectroscopy (FTIR) spectrum of control cold cure silicon group (CCS) revealed the characteristic band which are SI-SI represented by the peak at 601661 cm-1,SI-C represent by the peak at 700-786,SI-O-SI represented by the peak 1009-1258,CH3 peak at 1412-1538,at range from 3000-2500 for SI-OH and H-O-H at peak 2962.59 as in Fig 2 A
After incorporation of Ag-Zinc acetate (Zn) zeolite as shown in (Fig 2-B) both spectra for cold cure silicon are quite similar except for SI-O-SI and CH3 which has stretching for experimental specimens of cold cure silicon soft liner
Summary
The resorption of alveolar bone might cause poor adaptation of the prosthesis that causes discomfort for patients. Relining is the step applied to resurface of a removable prosthesis with new substance, provide a precise adaptation to foundation area of the denture [2]. The chair side relining with soft liner is applied extensively in prosthetic treatment because of simplicity of this technique, and well fitness of prosthesis. Liner materials have a key role in new prosthodontics. The lack of adhesion of cold cure silicon soft liner to the denture base is one of the important serious problems. The failure of adhesion between the silicone denture lining materials and base of denture is very common and causes the deboned regions, functional failure of the prosthesis, and accumulation of calculus, plaque and bacterial growth [5].
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