31 Mpa (Graphs ​(Graphs22 and ​and3),3), Group II = 7 37 Mpa (Gra

31 Mpa (Graphs ​(Graphs22 and ​and3),3), Group II = 7.37 Mpa (Graphs ​(Graphs22 and ​and4),4), Group III = 8.96 Mpa (Graphs ​(Graphs22 and ​and5)5) and Group IV = 5.56 Mpa (Graphs ​(Graphs22 and ​and6)6) and

Standard deviation in Group I = 1.47 Mpa, Group price PS-341 II = 1.01 Mpa, Group III = 1.20 Mpa, Group IV = 0.92 Mpa. Graph 2 Mean shear bond strength of control and experimental group. Graph 3 Shear bond strength of 10 samples of Group I. Graph 4 Shear bond strength of 10 samples of Group II. Graph 5 Shear bond strength of 10 samples of Group III. Brackets recycled with flaming and electropolishing were having the least shear bond strength (Graph 7). Graph 6 Shear bond strength of 10 samples of Group IV. Graph 7 Comparison of shear bond strength of the control group and all four subgroups of the experimental group. It was found that, the ANOVA test for the comparison of mean of different groups yielded a significant result i.e. the ANOVA test is rejected with P < 0.01. As such we can say that the different groups cannot be considered to have

the same mean. The Tukey’s test analysis to identify those groups that had lead to the rejection of the ANOVA was applied. The F value was significant. Hence, shear bond strength differed significantly in different groups. Shear bond strength was found maximum in the control group (Table 2). Table 2 Mean (Megapascals) and standard deviation (Megapascals) of shear bond strength of the control group and experimental group. Shear bond strength of the control group was found to be maximum among all recycled groups. From Table 3 we understand that,

the ANOVA test for the comparison of mean of different groups yielded a significant result i.e. the ANOVA test is rejected with P < 0.01. As such we can say that the different groups cannot be considered to have the same mean. Table 3 Analysis of variance of shear bond strength in the control group and experimental group. Shear bond strength of recycled brackets bonded with silane coupling agent (Group III) and recycled with flaming, electropolishing, Dacomitinib sandblasting and ultrasonic cleaning was equivalent to the control group. Multiple comparisons are displayed in Table 4. Table 4 Multiple comparisons. Brackets recycled with flaming and sandblasting had less shear bond strength as compared to Control group. Hence, the result summary for highest shear bond strength is as follows: Control Group = Silane coupling Agent > Flaming + Sandblasting > Flaming + Ultrasonic Cleaning > Flaming + Electropolishing Discussion The invention of Etching Technique by Bunocore (1955) and its eventual application in our discipline for directly bonding brackets to the surface of teeth, largely simplified the time consuming procedure of fixed orthodontic treatment. The ease of bonding improved patient acceptance and assured its widescale application by orthodontists.

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