Comparison of the orthodontic load systems created with elastomeric power chain to close extraction spaces on different rectangular archwires
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1) to assess different methods of recycling orthodontic brackets, 2) to evaluate Shear Bond Strength (SBS) of (a) new, (b) recycled and (c) repeated recycled stainless steel brackets (i) with and (ii) without bracket base primer.A total of 180 extracted human premolar teeth and 180 premolar stainless steel brackets were used. One hundred teeth and 100 brackets were divided into five groups of 20-teeth each. Four methods of recycling orthodontic brackets were used in each of the first four groups while the last one (group V) was used as the control. Groups (I-V) were subjected to shear force within half an hour until the brackets debond. SBS was measured and the method showing the highest SBS was selected. A New group (VI) was recycled twice with the selected method. Six subgroups (1-6) were established; the primer was applied for three sub-groups, and the composite was applied for all brackets. Brackets were subjected to the same shear force, and SBS was measured for all sub-groups.There was a significant difference between the mean SBS of the sandblasting method and the means of SBS of each of the other three methods. There was however, no significant difference between the mean SBS of the new bracket and the mean SBS of recycled bracket using sandblasting. The mean SBS of all sub-groups were more than that recommended by Reynolds (17) in 1975. Brackets with primer showed slightly higher SBS compared to those of brackets without bonding agent.To decrease cost, sandblasted recycled orthodontic brackets can be used as an alternative to new brackets. It is recommended to apply a bonding agent on the bracket base to provide greater bond strength. Key words:Recycled bracket, shear bond strength, sandblasting, stainless steel orthodontic bracket.
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Objective Contrast MBTTM Straight Wire Appliance-7°and +7°canine bracket orthodontics canine eminence patients on the movement speed of canine distalization.Methods 20 maxillary labial root and lingual crown tip patients were selected who needed treatment by extracting the first premolar 14,24,34,44,and micro-implants as anchorage.Used MBT Straight Wire Appliance,10 patients were chosen randomly as experimental group used +7°canine bracket,another 10 patients as control group,maxillary canine distalization respectively,the movement distances of canine were measured and analyzed statistically.Results Experimental group canine distalization faster than control group.Conclusion Orthodontics the patients of canine eminence,use +7° canine bracket is faster than use-7°canine bracket,clinical give priority to the suggestion.
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Aim: This study aims at comparing the transverse width changes during leveling and aligning phase with conventional and self-ligating brackets. Materials and Methods: The study consisted of twenty samples. The sample was split into two groups. Group 1 consisted of ten samples treated with conventional brackets and ten samples treated with self-ligating brackets. Pretreatment and leveling aligning cast were used for the study. Measurement of transverse dimension was taken at two different regions, premolar and molar. Reference points were chosen according to the Pont's model analysis. In the premolar region, measurements were made from the distal pit of the first premolar on either side, and in the molar region, measurements were made from the mesial pit on either side. The overall values are compiled and compared among both the bracket groups. Results: The results of the study showed that there were changes in the interpremolar and intermolar arch width during leveling and aligning phase in both the bracket types. Conclusion: Since the arch width changes can affect the stability in the posttreatment phase, an orderly use of custom-made archwires from the very beginning is advised. The amount of arch width changes that occur with the treatment is irrespective of the bracket type, provided that other factors are maintained to be constant. Both conventional metal-ligated brackets and dual-activation self-ligating brackets provide an equal amount of changes in the dental arch transverse dimensions.
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Background: This study was carried out to investigate the most common sites of bracket failure during orthodontic treatment and the factors causing them. The effectsof gender and age were also assessed.Method: A total of 70 patients (38 females and 32 males) with a mean age of 20.2 years undergoing fixed orthodontic treatment at the University of Ghana Dental School who had reported with bracket failures were selected to participate in this study. The number, site and date of bond failures were recorded over a period of five months. Data was captured using the SPSS 16. T-test and ANOVA were used to compare means. Chi-square was used to compare proportions.Results: 168 orthodontic bracket failures were recorded for the period of six months. 111(66%) bracket failures occurred in the lower arch while 57(34%) occurred in the upper arch. 120(71%) failures occurred in the posterior regions while 48(29%) occurred in the anterior regions. 54%reported that eating was the cause of bracket failure. Brushing caused the highest number of mean bracket failures per patient. Thelower left second premolar recorded the highest number of failures followed by the lower right second premolar.Conclusion: The left lower second premolar recorded the highest number of bracket failures followed by the lower right second premolar. The major cause of the bracket breakages according to the patients was eating while tooth brushing cause the highest number of mean bracket failures per patient
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