Does proclination of maxillary incisors really affect the sagittal position of point A?

Bıçakçı, Ali Altuğ; Cankaya, Ozkan Semih; Mertoglu, Serhat; Yılmaz, Nurbengü; Altan, Burcu Kocoglu

doi:10.2319/021413-133.1

Cited by 14 publications

(15 citation statements)

References 18 publications

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“…[8][9][10] Few studies also attempted to find the effect of torquing of incisors on position of point A. 4,6,[11][12][13] But only very few investigators tried to establish a direct association between the degrees of changes in the inclination of incisor to movement of point A. 2 With this background in this study, we made an attempt to determine the relation between the degree of incisor inclination correction and anteroposterior movement of point A by studying pre-and postalignment lateral cephalograms of class II division 2 and in class III patients.…”

Section: Discussionmentioning

confidence: 99%

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Equation between Incisor Inclination Correction and Anteroposterior Movement of Point A to determine the Actual Magnitude of Maxillomandibular Difference

Krishnamurthy¹,

Mehta²

2017

World Journal of Dentistry

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Aim: To determine the actual position of point A by performing incisor inclination correction in class II division 2 and class III. Also, to determine the relation between the degree of incisor inclination correction and anteroposterior movement of point A by studying pre-and postalignment lateral cephalograms. Materials and methods:The pre-and postalignment lateral cephalograms of 33 class II division 2 and 33 class III patients treated orthodontically were traced manually and analyzed. The linear anteroposterior measurements of point A and center of rotation in relation to the vertical reference plane and angular measurements of upper incisor to maxillary plane were calculated. Results:In class II division 2 category, the mean change in inclination from pre-to postalignment was 15.27°, mean change in position of center of rotation was −1.29 mm, and mean change in position of point A from pre-to postalignment was −2.67 mm. In class III category, the mean change in inclination from pre-to postalignment was −5.85°, mean change in position of center of rotation from pre-to postalignment was 1.94 mm, and mean change in position of point A from pre-to postalignment was 1.77 mm. Conclusion:The results of the study confirmed that for every 10° proclination of the upper incisor in class II division 2, point A moves 0.3 mm palatally and for every 10° retroclination of the upper incisor in class III, point A moves 0.73 mm labially. Clinical significance:In the clinical scenario of severely retroclined/proclined incisors, point A cannot depict the actual anterior limit of maxilla. Hence, when we use SNA to determine the anteroposterior position of maxilla and ANB to determine maxillomandibular difference, invariably we get altered values. Therefore, it is necessary to find an equation between the degree of incisor inclination correction and anteroposterior movement of point A.

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Section: Discussionmentioning

confidence: 99%

“…5,12 This is especially so in the case of palatal torque done in class II division 2. Another observed fact is that the center of rotation is located close to bracket irrespective of type of torque.…”

Section: Wjdmentioning

confidence: 99%

Equation between Incisor Inclination Correction and Anteroposterior Movement of Point A to determine the Actual Magnitude of Maxillomandibular Difference

Krishnamurthy¹,

Mehta²

2017

World Journal of Dentistry

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“…A few studies have attempted to investigate the effect of incisor inclination on the position of points A and B. Erverdi [12] showed a direct correlation between incisor inclination changes and point A. Hassan et al [13]found that if the upper incisor is retroclined by 10°, point A will move superiorly by 0.6 mm. In another study by Bicakci et al [14], it was found that the proclination of the maxillary incisors along with the backward movement of the incisor root apex causes a change in the horizontal position of point A. It was suggested to use the linear movement of the incisor apex, rather than the angular measurements to evaluate the sagittal change of point A [14].…”

Section: Introductionmentioning

confidence: 99%

“…In another study by Bicakci et al [14], it was found that the proclination of the maxillary incisors along with the backward movement of the incisor root apex causes a change in the horizontal position of point A. It was suggested to use the linear movement of the incisor apex, rather than the angular measurements to evaluate the sagittal change of point A [14]. Nevertheless, research on this topic has been limited thus far.…”

Section: Introductionmentioning

confidence: 99%

Morphological changes of the anterior alveolar bone due to retraction of anterior teeth: a retrospective study

Sun

Chen

et al. 2019

Preprint

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Background: The morphology of the anterior alveolar bone may change after the retraction of incisors in premolar extraction cases in orthodontics. Methods: Pre- (T0) and post-treatment (T1) lateral cephalograms of 477 subjects in the maxilla and 226 subjects in the mandible who underwent the orthodontic treatment with extraction of 2 premolars in upper or lower arches were included. Alveolar bone width and height in both the maxillary and mandible incisor area were measured at T0 and T1 respectively. By superimposing the T0 and T1 cephalometric tracings, changes of points A and B, and the movement of the incisors were also measured. Results: The alveolar bone width (ABW) showed a significant decrease in both maxilla and mandible (P<0.001) except the labial side of the mandible, which exhibited slight increase, though statistically insignificant (P>0.05). The alveolar bone height (ABH) showed a significant increase in the labial side of maxilla and a significant decrease in the lingual side of maxilla and mandible. A strong positive correlation was observed between incisor movement and position changes of points A and B both in the horizontal and vertical direction. Conclusions: Anterior alveolar bone width and height generally decreased after orthodontic treatment. Incisor retraction led to a significant position changes of points A and B.

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“…However the points are dento-alveolar and are considered unreliable as they are affected by surface remodelling and underlying tooth position. 4 Post-operative skeletal position should rely on basal bone assessment as any post-operative dental changes may camouflage the true basal bone position. Therefore clinical or 2D radiological assessment of teeth position may not accurately reflect basal bone changes.…”

Section: Introductionmentioning

confidence: 99%

The validity of using surface meshes for evaluation of three-dimensional maxillary and mandibular surgical changes

Jabar

Robinson

Goto

et al. 2015

International Journal of Oral and Maxillofacial Surgery

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request.The validity of using surface meshes for evaluation of three-dimensional maxillary and mandibular surgical changes. Surface meshes for evaluation of 3D hard tissue surgical changes Key words: CBCT, surface mesh, surgical change, three-dimensional, 3D. SummaryThree-dimensional changes of hard tissue position following orthognathic surgery have been reported using 3D cephalometry, changes in volume, centroid position and changes based on the surface model of the hard tissue.The aim of this study was to determine the validity of using surface models as a method of assessing positional changes of the maxilla and the mandible.

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Does proclination of maxillary incisors really affect the sagittal position of point A?

Cited by 14 publications

References 18 publications

Equation between Incisor Inclination Correction and Anteroposterior Movement of Point A to determine the Actual Magnitude of Maxillomandibular Difference

Equation between Incisor Inclination Correction and Anteroposterior Movement of Point A to determine the Actual Magnitude of Maxillomandibular Difference

Morphological changes of the anterior alveolar bone due to retraction of anterior teeth: a retrospective study

The validity of using surface meshes for evaluation of three-dimensional maxillary and mandibular surgical changes

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