Amir Mohammadi; Saeid Foroughi Moghaddam
Abstract
Aim: Infectious complication which is reduced by chlorhexidine application may contribute to immediate orthodontic miniscrew failure. This study was determined to assess the influence of this agent on miniscrew immediate failure rate.
Materials and Methods: The study sample consisted of 62 miniscrews ...
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Aim: Infectious complication which is reduced by chlorhexidine application may contribute to immediate orthodontic miniscrew failure. This study was determined to assess the influence of this agent on miniscrew immediate failure rate.
Materials and Methods: The study sample consisted of 62 miniscrews inserted in 31 patients that their treatment plan consisted of placing one miniscrew on each side of their maxillary arch between first molar and second molar (2 screws for each patient). Fifteen patients were given a chlorhexidine regimen. Results: In the first six weeks after miniscrew insertion and before their loading 13.33 % of miniscrews in chlorhexidine group failed but the failure rate in non-chlorhexidine group was 6.25 %. According to Fisher's exact test the difference in failure rate was not statistically significant. Also there was no significant relation of failure rate to any category of the measured insertion torques or placement side (left or right) of miniscrews. Conclusion: Using chlorhexidine does not affect the miniscrew immediate failure rate. Also, insertion torque value and placement side (left or right side of the jaw) in the maxilla do not seem to have influence in miniscrew failure rate.
Hooman Zarif; Hamid Reza Pakshir
Abstract
Impaction of the lower second molar is not a common problem (0.03%), but it is very challenging for orthodontists. Unilateral mandibular second molar impaction is the most popular form of second molar impactions. The etiology of which is related to some disturbances in physiological mandibular growth ...
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Impaction of the lower second molar is not a common problem (0.03%), but it is very challenging for orthodontists. Unilateral mandibular second molar impaction is the most popular form of second molar impactions. The etiology of which is related to some disturbances in physiological mandibular growth and tooth development. Other factors have been cited for this problem is iatrogenic such as space gaining procedures in mixed dentition. Treatment options depend on degree of tooth inclination, the position of third molar and desired type of tooth movement. Advantages of impacted molar uprighting arc functional, periodontal and restorative. In this case report, treatment of partially impacted second molars in a 12 year — old girl with class I malocclusion is presented. Uprighting of both second molars was performed in two stages. It was concluded that using continuous stainless steel wire with T-loop and gable bend is an effective method for correction of second molar inclination with the least risk of molar extrusion.
