Özet:

The aim of this study is to evaluate the factors affecting the success of orthodontic mini screw used at fixed orthodontic treatment While including patients in the study, mechanical properties of mini screws and systemic conditions of patients were considered. During the collection of data of orthodontic mini screw, the sex, age, number of mini screw, placement area, usage time, loss number and loss area and etc were noted. All data were statistically analyzed. Pearson's chi-square test was used to assess whether there is a dependency between variables. In this study, 152 mini screws used at 50 woman and 26 man patients were evaluated. Approximately 70% of patients’ ages were between 13- 15 years and 65.8% of patients were women. It was determined that usage time of mini screws were changing between 1-16 months but mini screws were used between 3-7 months generally. It was seen that mini screws were placed between upper second premolar and upper first molar mainly. 93.4% of mini screws were used successfully and success rate of mini screw at women is higher than men. Loss rate of mini screw placed in lower jaw especially molar area is higher than other areas and upper jaw as placement area is more successful than lower jaw as placement area Orthodontic mini screws as anchorage unit can be used successfully. Female sex and upper jaw as placement area are good factor and they affect the success rate of mini screws positively

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