On bracket slot height: A methodologic study

Meling, Torstein R.; Ødegaard, Jan; Seqner, Dietmar

doi:10.1016/s0889-5406(98)80009-7

Cited by 29 publications

(34 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[14][15][16] Although this is a valid issue from a theoretical perspective, in practice such small differences in torque can only be expressed if very precisely manufactured straight-wire components are available. 13 However, in the real world the archwire and bracket slot dimensions declared by manufacturers do not always correspond to the real measurements, and no information on the size tolerance of the materials on the market is provided. Hence, clinicians cannot determine how the preprogrammed information, in particular third order, will be transmitted to the teeth.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, the photographic evidence shows that the bevel cross-sections do not follow a perfect circle and instead present irregularities (Figure 9). Nevertheless, using the formula proposed by Meling et al 13 in 1998, we were able to calculate the archwireslot play. Meling's formula was initially conceived to calculate the real slot height from the dimensions of the archwire, measured using a digital gauge, and the real archwire-slot play, measured by means of a torsion test.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, 22 measurements were subjected to calculation of the intraclass correlation coefficient r to determine the reproducibility of the measurement protocol. 12 A modified version of the mathematical formula proposed by Meling et al 13 was used to calculate the real value of the archwire-slot play from the variables archwire dimensions, slot size, and edge bevel radius ( Figure 8). Archwire height, width, and bevel radius measurements were recorded as variables on an Excel spreadsheet (Microsoft Excel 2007, Redmond, WA, USA).…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Lombardo

Arreghini

Bratti

et al. 2014

The Angle Orthodontist

View full text Add to dashboard Cite

Objective: To evaluate the degree to which the height, width, and cross-section of rectangular and square orthodontic archwires affect the play between the archwires and the bracket slot. Materials and Methods: The stated measurements (height and width) of 43 archwires from six different manufacturers were compared with real values obtained using a digital gauge. The curvature (radius) of the edge bevels was also measured to calculate the play within the slot, and this measurement was compared with the ideal value. Results: The real height and width of the archwires differed from those stated by the manufacturers, falling within the range 26.47% and +5.10%. The curvature of each bevel on each archwire cross-section was shown to differ, and consequently increased the real play between the archwire and slot with respect to the ideal to different degrees. Conclusions: The archwire-slot play was greater than the ideal for each archwire considered, inevitably leading to a loss of information within the system. (Angle Orthod. 2015;85:848-858.)

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Lombardo

Arreghini

Bratti

et al. 2014

The Angle Orthodontist

View full text Add to dashboard Cite

show abstract

“…Theoretically, the torque play could be estimated, using appropriate tables or formulas, at about 7-8u in the 0.022-inch slot and half that amount for a 0.017 3 0.025-inch in the 0.018-inch slot. 1,29,30 However, various experimental configurations revealed that torque play is actually higher in conventional 5,6,31 and self-ligating bracket systems.…”

Section: Discussionmentioning

confidence: 99%

“…32 The inconsistency in torque play assessments between theoretical calculations and experimental configurations could be attributed to dimensional inconsistency of archwire and bracket as well as to rounded wire edges. 3,30,31 In addition, the bracket slot could be tapered slightly, resulting in further torque-loss fluctuations between archwires of different cross sections. 3 The OMSS model approximates the clinical situation, and the torque loss is notably higher than in the in vitro activating experiments.…”

mentioning

confidence: 99%

Torque efficiency of different archwires in 0.018- and 0.022-inch conventional brackets

Sifakakis

Pandis

Makou

et al. 2013

The Angle Orthodontist

View full text Add to dashboard Cite

Objective: To compare the archwires inserted during the final stages of the orthodontic treatment with the generated moments at 0.018-and 0.022-inch brackets. Materials and Methods: The same bracket type, in terms of prescription, was evaluated in both slot dimensions. The brackets were bonded on two identical maxillary acrylic resin models, and each model was mounted on the orthodontic measurement and simulation system. Ten 0.017 × 0.025-inch TMA and ten 0.017 × 0.025-inch stainless steel archwires were evaluated in the 0.018-inch brackets. In the 0.022-inch brackets, ten 0.019 × 0.025-inch TMA and ten 0.019 × 0.025-inch stainless steel archwires were measured. A 15°buccal root torque (+15°) and then a 15°palatal root torque (-15°) were gradually applied to the right central incisor bracket, and the moments were recorded at these positions. A t-test was conducted to compare the generated moments between wires within the 0.018-and 0.022-inch bracket groups separately. Results: The 0.017 × 0.025-inch archwire in the 0.018-inch brackets generated mean moments of 9.25 Nmm and 14.2 Nmm for the TMA and stainless steel archwires, respectively. The measured moments in the 0.022-inch brackets with the 0.019 × 0.025-inch TMA and stainless steel archwires were 6.6 Nmm and 9.3 Nmm, respectively. Conclusion: The 0.017 × 0.025-inch stainless steel and -Ti archwires in the 0.018-inch slot generated higher moments than the 0.019 × 0.025-inch archwires because of lower torque play. This difference is exaggerated in steel archwires, in comparison with the -Ti, because of differences in stiffness. The differences of maximum moments between the archwires of the same cross-section but different alloys were statistically significant at both slot dimensions. To compare the archwires inserted during the final stages of the orthodontic treatment with the generated moments at 0.018-and 0.022-inch brackets. Materials and Methods: The same bracket type, in terms of prescription, was evaluated in both slot dimensions. The brackets were bonded on two identical maxillary acrylic resin models, and each model was mounted on the orthodontic measurement and simulation system. Ten 0.017 3 0.025-inch TMA and ten 0.017 3 0.025-inch stainless steel archwires were evaluated in the 0.018-inch brackets. In the 0.022-inch brackets, ten 0.019 3 0.025-inch TMA and ten 0.019 3 0.025-inch stainless steel archwires were measured. A 15u buccal root torque (+15u) and then a 15u palatal root torque (215u) were gradually applied to the right central incisor bracket, and the moments were recorded at these positions. A t-test was conducted to compare the generated moments between wires within the 0.018-and 0.022-inch bracket groups separately. Results: The 0.017 3 0.025-inch archwire in the 0.018-inch brackets generated mean moments of 9.25 Nmm and 14.2 Nmm for the TMA and stainless steel archwires, respectively. The measured moments in the 0.022-inch brackets with the 0.019 3 0.025-inch TMA and stainless steel archwires were 6.6 Nmm and 9.3 Nmm, respect...

show abstract

Precision brackets for upper lateral incisors in Bioprogressive therapy

Araujo

Guedes

Cunha

et al. 2019

Microscopy Res & Technique

View full text Add to dashboard Cite

Orthodontic brackets, specifically in their slots, are responsible for receiving active orthodontic forces and transferring them to the teeth to be moved. The presence of an altered slot or inaccurate dimensions can influence the mechanical relationship between the bracket and archwire, interfering with the biomechanics of tooth movement. The objective of this study was by comparing the accuracy of slot placement of upper right lateral incisor metal brackets for Bioprogressive Ricketts therapy from five trademarks. The following characteristics were evaluated: height, torque, and internal parallelism of the walls of the slot. The sample included 75 brackets, 15 each from the following trademarks: 3M Abzil, Forestadent, Morelli Rocky Mountain Orthodontics, and Tecnident. Images of the slot profiles were obtained through standardized techniques using scanning electron microscopy, measured by the AutoCAD 2017 software, and compared to Ricketts prescription, respecting standard deviation with the technical and tolerance parameters present in standard ISO 27020. The results indicated that most of the evaluated characteristics were in accordance with the standard parameters, considering the tolerance adopted. There were exceptions found to this pattern of precision in the 3M Abzil brackets with regard to torque variation, and the Morelli brackets in relation to height variation and parallelism between the walls of the slot. Considering the measured dimensional characteristics, the metal brackets used in Bioprogressive Ricketts therapy has satisfactory pattern accuracy; however, there are still some specific inaccuracies in brackets from certain brands that can require more attention during the detailing phase. K E Y W O R D S brackets, parallelism, size, slot, torque

show abstract

On bracket slot height: A methodologic study

Cited by 29 publications

References 4 publications

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Comparative analysis of real and ideal wire-slot play in square and rectangular archwires

Torque efficiency of different archwires in 0.018- and 0.022-inch conventional brackets

Precision brackets for upper lateral incisors in Bioprogressive therapy

Contact Info

Product

Resources

About