Abstract：
BACKGROUND:Orthodontic treatment with fixed appliances requires - among others - the correct clinical expression of torque, which depends on the precise fitting of archwire and slot. Especially in the lingual technique torque problems become clinically more evident than in labial appliances also with respect to the vertical alignment of teeth due to different distances from the center of resistance. The purpose of the present study was to compare the preciseness of slot dimensions of different lingual bracket systems. METHODS:Three lingual bracket systems were included in the study (7th Generation and STb, Ormco, Glendora, CA, USA; Incognito, TOP-Service/3 M Unitek, Monrovia, CA, USA). Non destructive analysis of vertical slot dimensions was performed using precision pin gauges (Azurea, Belprahon, Switzerland) that were tapered in increments of 0.002 mm (0.00008 inch). The sizes of 240 incisor and canine brackets were measured per system (total: 720). Data were compared using one-way ANOVA. A p-value < 0.05 was considered statistically significant. RESULTS:Average slot dimensions were 0.467 mm +/- 0.007 mm (0.0184 inch +/- 0.0003 inch) for the 7th Generation bracket system, 0.466 mm +/- 0.004 mm (0.0183 inch +/- 0.0001) inch for the STb bracket system and 0.459 mm +/- 0.004 mm (0.0181 inch +/- 0.0001) inch for the Incognito bracket system. Differences between systems were statistically significant (p < 0.05). CONCLUSIONS:The analyzed bracket systems for lingual treatment exhibited significant differences in slot dimension that will clinically result in torque play. These aspects must be considered in lingual orthodontic treatment.
journal_name
Head Face Medjournal_title
Head & face medicineauthors
Demling A,Dittmer MP,Schwestka-Polly Rdoi
10.1186/1746-160X-5-27subject
Has Abstractpub_date
2009-12-15 00:00:00pages
27issn
1746-160Xpii
1746-160X-5-27journal_volume
5pub_type
杂志文章abstract：:The traumatic bone cyst (TBC) is an uncommon nonepithelial lined cavity of the jaws. The lesion is mainly diagnosed in young patients most frequently during the second decade of life. The majority of TBCs are located in the mandibular body between the canine and the third molar. Clinically, the lesion is asymptomatic ...
journal_title：Head & face medicine
pub_type： 杂志文章
doi：10.1186/1746-160X-2-40
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abstract：:Ectopic internal carotid artery (ICA) is a very rare variation. The major congenital abnormalities of the ICA can be classified as agenesis, aplasia and hypoplasia, and they can be unilateral or bilateral. Anomalies of the neck artery may be vascular neoplasms or ectopic position. Carotid angiograms provide absolute c...
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pub_type： 临床试验,杂志文章
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pub_type： 杂志文章,评审
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pub_type： 杂志文章
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pub_type： 杂志文章
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