Abstract
Aims: The current study aims to investigate the rate of space closure, tipping and rotation of canine during its retraction by laceback and tieback using standard ceramic brackets along 2 types of arch- wires using typodont simulation system (Ormco). Materials and Methods: The standardization crite- ria were all typodont teeth situated in well aligned position, covered and immobilized by the acrylic bite except canine, laceback and tieback were used to slide the canine. Results: The present study showed that when slide the canine on 0.017x 0.025 inch archwire gave rise to significant decrease in the rate of space closure, degree of tipping and rotation as compared when sliding it on 0.020 inch archwire, also sliding the canine using laceback as a method of retraction gave rise to a significant de- crease in the rate of space closure, degree of tipping and rotation as compared with tieback. Conclu- sions: It was concluded that canine retraction using laceback retraction method along 0.017x0.025 inch archwire gave rise to a significant decrease in the rate of space closure, degree of tipping and rota- tion.
Highlights
(1) Elastic tieback: Using an elastomeric module, of the type used to hold archwires on to bracket, stretched to twice its normal size; this was found to give a force of 50100gm if the module was pre-stretched before use.[2, 3] Laceback: These are 0.010 or 0.009inch steel ligature in a figure of eight running from the canine to the premolar which hold back the canine crown whilst uprighting occurs and at the same time lightly retracts the canine.[4]
Degree of canine rotation is Laceback in sliding mechanics measured when the typodont is photographed with vertical projection from occlusal side of typodont (Figure 2), this angle is considered as canine's bar rotation angle so degree of canine rotation = canine's bar original angle (90o)-canine's bar rotationangle
Comparison between 0.017x0.025 inch and 0.020inch arch wires by two methods of retraction (Table 1) revealed that sliding the canine along 0.020inch arch wire showed highest mean value for the rate of space closure, degree of tipping and rotation than sliding it along 0.017x0.025inch arch wire except by tieback retraction method which showed no significant differences in the rate of space closure
Summary
Sliding mechanics are commonly used orthodontic techniques to close interdental spaces in which the bracketed tooth, in effect, slide along an archwire. [1] Elastic tieback: Using an elastomeric module, of the type used to hold archwires on to bracket, stretched to twice its normal size; this was found to give a force of 50100gm if the module was pre-stretched before use.[2, 3] Laceback: These are 0.010 or 0.009inch steel ligature in a figure of eight running from the canine to the premolar which hold back the canine crown whilst uprighting occurs and at the same time lightly retracts the canine.[4]. Sliding mechanics are commonly used orthodontic techniques to close interdental spaces in which the bracketed tooth, in effect, slide along an archwire. [1] Elastic tieback: Using an elastomeric module, of the type used to hold archwires on to bracket, stretched to twice its normal size; this was found to give a force of 50100gm if the module was pre-stretched before use.[2, 3] Laceback: These are 0.010 or 0.009inch steel ligature in a figure of eight running from the canine to the premolar which hold back the canine crown whilst uprighting occurs and at the same time lightly retracts the canine.[4]. The aims of this study were to investigate the rate of space closure, tipping and rotation of canine during its retraction by laceback and tieback methods
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