Massoud Seifi; Negin Sadat matini
Abstract
Aim: The purpose of the present study was to systematically review the literature on the success and failure of the miniscrews.Materials and Methods: Titles and abstracts in Medline Databases (PubMed) were screened by 2 reviewers. First result contains 273 articles, after search filters they have reached ...
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Aim: The purpose of the present study was to systematically review the literature on the success and failure of the miniscrews.Materials and Methods: Titles and abstracts in Medline Databases (PubMed) were screened by 2 reviewers. First result contains 273 articles, after search filters they have reached to 9 articles. All articles were discussed by 2 reviewers and disagreements were solved.Results: The total success rate were available in all 9 studies and ranged from 70.3% to 96%. The number of treated patients were ranged from 15 to 141and also the number of miniscrews ranged from 44 to 260. The success and failure rates of miniscrews in these 9 studies had no significant correlation with gender. Statistic methods are different among these clinical trials.Conclusion: It seems that weak consensus exist between bulk of data obtained from different clinical trials. Gender has been mentioned as a predisposing factor for success or failure rate and some article reported more success for male, some for female, and some no difference. Immediate loading has more success rate according to some investigations but many investigators suggest a healing period and delayed loading. Diameter and length of miniscrews and their dispersion factor is another source of inconsistency among authors. Diameters start from (in millimeter) 1.2, 1.3, 1.6-1.8 to 2 mm and length starts from (in millimeter) 5, 6,7,8 to 10 mm and different success rate is reported for these parameters. Even success or failure rate is described differently among clinicians and it start from stability during first one week, extends to six month and two year. In addition, some authors believe that because of the pool of subjects (large sample with important elements) in retrospective studies, appropriate statistics are Kaplan-Meier survival curves based on rigorous clinical success or failure criteria instead of success or failure rate.
Seyed Mohammadreza Safavi; Mehdi Ravadgar; Fatemeh Mashhadiabbas; D. Sharifi; Alireza Akbarzadeh Baghban
Abstract
Background and aims: To evaluate the frequency of ankylosis, loss of pulp vitality and external root resorption after intentional root contact with mini-screw.Methods: Sixty maxillary and mandibular second, third, and fourth premolars teeth of five mature beagle dogs were randomly assigned into three ...
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Background and aims: To evaluate the frequency of ankylosis, loss of pulp vitality and external root resorption after intentional root contact with mini-screw.Methods: Sixty maxillary and mandibular second, third, and fourth premolars teeth of five mature beagle dogs were randomly assigned into three experimental groups. Premolars teeth at group I, received a mini-screw (6-mm length, 1.5mm diameter, self drilling) which was removed immediately after contact with the root. Group II consisted of teeth that received mini-screw and the screw left in situ for 15 weeks. In group III once contact was made with mini-screw, the teeth were shifted away from the screw with brackets and Titanium closed coil spring tightened to another bonded orthodontic brackets on the neighbor teeth. Group IV was the control group. The specimens were decalcified, stained and evaluated histologically to determine the presence/absence of root resorption, ankylosis and tooth vitality.Results: There were no signs of ankylosis, root resorption, moderate to severe inflammation or necrosis within the pulp in any experimental group.Conclusions: Ankylosis, pulp necrosis and sever root resorption are not common clinical outcomes when mini-screw contacts the root. Repair after contact with mini-screw depends on the severity of invasion. More severe invasion needs further time necessary for repair.