Evaluation of Intrusive Forces Created by ‘V’ Bend, Intrusion Arches at Various Deflections: An Invitro Study

Aim: To evaluate of intrusive forces created by ‘v’ bend, intrusion arches at various deflections- an invitro study. Objective: The present study is to consider the importance of alloy used as intrusion arches. Material and Method: We used stainless steel wires, timolium wires, CNA Beta 3. Wires (Libral,USA), blue elgiloy all with rectangular section of dimension 0.017 x 0.025 inch, 15 numbers each. Arch forms are standardized with the help of arch form selector guide. Three distances from vestibule to bracket slot in upper anteriors were marked. Trials were conducted at the CIPET (Central Institute Of Plastic Engineering and Technology, Chennai) and a dynamometer (Autograph, U.K) with 1kgf load cell at 0.01kgf resolution and speed of 10mm/min7. The load magnitude at various displacements (5, 10, 15 mm) were recorded. Statistical Method: The significance level of 5% was taken. ANOVA was used for assessing the force of all the alloys and Tukey test was used for multiple comparisons. Results: The forces recorded at 5, 10, and 15 mm were all significant between the four alloys when compared except for CNA and timolium between 5 mm and 10 mm and for blue elgiloy between 10 mm and 15 mm were not statistically significant. Conclusion: The load increments tends to decrease from the first to last increment, and the differences is being more significant from the first increment to the second increment for all the alloys, and more significant in stainless steel and the blue elgiloy. CNA produced the least force.