Research Article 
Wael Abdul Razzak Al waelly¹*
Abstract
The mouth washes are widely used for maintain oral hygiene for patient wearing fixed orthodontic appliances but had effect on the elastic ligature so it’s important to measure the modulus elasticity of elastic ligature. This study was carried out to evaluate the effect of different type of mouthwashes on modulus elasticity of the elastic ligature. A 40 elastic ligatures were selected from commercially available clear elastic ligature, the elastics were adjusted on S.S brackets which were bonded to maxillary right first premolar by chemical composite, the elastic ligatures were divided into four main groups and each group had 10 elastics as follows: group A. 10 elastic ligatures were immersed in a pool distilled water at 37c instead of saliva. Group B. 10 elastic ligatures were immersed in bio fresh. Group C. 10 elastic ligatures were immersed in corsodyl. Group D, 10 elastic ligatures were immersed in parodontax. All samples were then tested to determine the modulus elasticity by instron machine. The Paradontax mouthwash group provided a higher value of mean of the modulus elasticity of the elastic ligature followed by distilled water and Corosydel groups. The biofresh had the least value of mean of the modulus elasticity. There were highly significant differences between control and Corosydel; and control and biofresh groups (P≤0.01). No significant differences, however, between control and paradontax groups (P≥0.05). In conclusion, the Paradontax mouthwash group had a great effect on the modulus elasticity of the elastic ligature. The biofresh had the least effect on the modulus elasticity.
Keywords: Elastic ligature; Modulus elasticity; Corsodyl