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Comparative analysis of slot dimension in lingual bracket systems.

Demling A, Dittmer MP, Schwestka-Polly R - Head Face Med (2009)

Bottom Line: Data were compared using one-way ANOVA.Differences between systems were statistically significant (p < 0.05).The analyzed bracket systems for lingual treatment exhibited significant differences in slot dimension that will clinically result in torque play.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Orthodontics, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany. Demling.Anton@mh-hannover.de

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.

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Slot precision. Results of determined slot precision (* = p < 0.001).
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Figure 5: Slot precision. Results of determined slot precision (* = p < 0.001).

Mentions: Results of experimental measurements are presented as a boxplot in Figure 5 and in Table 1. 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 system. The calculated medians for the included lingual bracket systems were 0.4660 mm (0.0184 inch) for the 7th Generation and the STb bracket and 0.4580 mm (0.0180 inch) for the Incognito bracket. Statistical analysis revealed significant differences in slot precision between all analyzed bracket systems, with the highest precision for the Incognito bracket and the lowest for the 7th Generation bracket (p < 0.001).


Comparative analysis of slot dimension in lingual bracket systems.

Demling A, Dittmer MP, Schwestka-Polly R - Head Face Med (2009)

Slot precision. Results of determined slot precision (* = p < 0.001).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2803453&req=5

Figure 5: Slot precision. Results of determined slot precision (* = p < 0.001).
Mentions: Results of experimental measurements are presented as a boxplot in Figure 5 and in Table 1. 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 system. The calculated medians for the included lingual bracket systems were 0.4660 mm (0.0184 inch) for the 7th Generation and the STb bracket and 0.4580 mm (0.0180 inch) for the Incognito bracket. Statistical analysis revealed significant differences in slot precision between all analyzed bracket systems, with the highest precision for the Incognito bracket and the lowest for the 7th Generation bracket (p < 0.001).

Bottom Line: Data were compared using one-way ANOVA.Differences between systems were statistically significant (p < 0.05).The analyzed bracket systems for lingual treatment exhibited significant differences in slot dimension that will clinically result in torque play.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Orthodontics, Hannover Medical School, Carl-Neuberg-Strasse 1, 30625 Hannover, Germany. Demling.Anton@mh-hannover.de

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.

Show MeSH