Effect of variation in tooth morphology and bracket position on first and third order correction with preadjusted appliances

Miethke, Rainer‐Reginald; Melsen, Birte

doi:10.1016/s0889-5406(99)70246-5

Cited by 88 publications

(74 citation statements)

References 8 publications

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“…3,10,15 Variation of facial crown contour may also be a contributing factor. 16,17 All teeth in this study had mean in-out values that were significantly lower than Andrews' original findings, but the relative crown prominence follows a pattern similar to that seen in Andrews' study, a point of considerable importance.…”

Section: In-out or Crown Prominencesupporting

confidence: 59%

“…16,17 Of particular clinical importance is the posttreatment torque measurement for maxillary central incisors. Torque of the upper incisors is an important factor in establishing the smile line, proper anterior guidance, and class I relationship of the teeth because anterior teeth with deficient torque tend to prevent the distal movement of the anterior maxillary segment.…”

mentioning

confidence: 99%

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Study Model-based Evaluation of Built-in Tip, Torque, and In–out Characteristics of a Third-generation Preadjusted Edgewise Appliance

Gupta

Gowdara

Manohar

et al. 2018

The Journal of Contemporary Dental Practice

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Aim:The aim of the study was to evaluate the clinical effectiveness of MBT™ preadjusted edgewise appliance (PEA) in terms of achieving the optimal expression of its built-in characteristics of tip, torque, and in-out. Materials and methods:Pretreatment and posttreatment study models of 20 subjects who received full fixed appliance treatment involving four first premolar extractions using the MBT™ appliance were measured for tip, torque, and in-out using the method described by Andrews. Treatment changes were analyzed statistically, and the posttreatment measurements were compared with the MBT™ specifications as well as Andrews' values for the above-mentioned parameters.Results: Except for the maxillary canines and second premolars, the built-in tip of MBT™ appliance was nearly fully expressed, though there was some lack of correlation with Andrews' values. Despite the fact that the full amount of torque built into the MBT™ appliance was not expressed, torque measurements for all teeth except the maxillary second premolars and the first molars showed either no statistically significant difference or were significantly higher than Andrews' values for these teeth. In-out readings were lower than both MBT™ and Andrews' values, but the relative order of crown prominences was similar. Conclusion and clinical significance:The MBT™ appliance is thus effective in ensuring a successful treatment result, though individual adjustments may be necessary for optimal tooth positioning at the end of the treatment, as with any preadjusted appliance.

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Section: In-out or Crown Prominencesupporting

confidence: 59%

mentioning

confidence: 99%

Study Model-based Evaluation of Built-in Tip, Torque, and In–out Characteristics of a Third-generation Preadjusted Edgewise Appliance

Gupta

Gowdara

Manohar

et al. 2018

The Journal of Contemporary Dental Practice

View full text Add to dashboard Cite

show abstract

“…Therefore, optimal treatment outcomes require effective torque expression, which is sensitive to irregularities in tooth anatomy, the size, morphology, and engagement of the archwire in the bracket, as well as the position, material properties, and slot size of the bracket (11)(12)(13)(14)(15)(16)(17). For example, although 0.22-inch brackets might be outperform 0.018-inch in some clinical aspects like sliding mechanics, they are inferior in torque expression (18,19).…”

Section: Introductionmentioning

confidence: 99%

Torque differences according to tooth morphology and bracket placement: a finite element study

Papageorgiou

Sifakakis

Keilig

et al. 2016

EORTHO

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INTRODUCTION Torque of the maxillary incisors is essential in esthetics and proper occlusion, while torque expression is influenced by many factors. The aim of this finite element study was to assess the relative effect of tooth morphology, bracket prescription, and bracket positioning on tooth displacement and developed stresses/strains after torque application. METHODS A three-dimensional upper right central incisor with its periodontal ligament (PDL) and alveolus was modelled. The tooth varied in the crown-root angle (CRA) between 156°, 170°, and 184°. An 0.018-inch slot discovery® (Dentaurum, Ispringen, Germany) bracket with a rectangular 0.018 × 0.025-inch -titanium wire was modelled. Bracket torque prescription varied between 0°, 12°, and 22°, with bracket placement at the centre of the middle, gingival or incisal third of the crown. A total of 27 models were generated and a buccal root torque of 30°was applied. Afterwards, crown and apex displacement, strains in the PDL, and stresses in the bracket were calculated and analysed statistically. RESULTS The palatal crown displacement was significantly affected by bracket positioning (up to 94 per cent), while the buccal apex displacement was significantly affected by bracket prescription (up to 42 per cent) and bracket positioning (up to 23 per cent). Strains in the PDL were affected mainly by CRA (up to 54 per cent), followed by bracket positioning (up to 45 per cent). Finally, bracket prescription considerably affected the stresses in the bracket (up to 144 per cent). LIMITATIONS These in silico results need to be validated in vivo before they can be clinically extrapolated. CONCLUSION Tooth anatomy and the characteristics of the orthodontic appliance should be considered during torque application.

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“…However, torque expression is a result of the interaction of many factors: bracket design (12), wire / slot play (engagement angle) (12), mode of ligation, 12 bracket deformation (13), wire stiffness (12,14), magnitude of wire torsion and dimension (13,(15)(16)(17), and wire edge beveling (18)(19)(20)(21)(22). Clinical factors such as initial tooth inclination13 bracket position (14,23), and tooth anatomy (24)(25)(26)(27) are also determinants of torque expression.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Torquing Ability of 0.019” × 0.025” Nickel Titanium and Fiber Composite Archwires -A Cone Beam Computed Tomography Study

Singh¹,

Singh²,

Kannan³

et al. 2016

Iran J Ortho

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Effect of variation in tooth morphology and bracket position on first and third order correction with preadjusted appliances

Cited by 88 publications

References 8 publications

Study Model-based Evaluation of Built-in Tip, Torque, and In–out Characteristics of a Third-generation Preadjusted Edgewise Appliance

Study Model-based Evaluation of Built-in Tip, Torque, and In–out Characteristics of a Third-generation Preadjusted Edgewise Appliance

Torque differences according to tooth morphology and bracket placement: a finite element study

Comparison of Torquing Ability of 0.019” × 0.025” Nickel Titanium and Fiber Composite Archwires -A Cone Beam Computed Tomography Study

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