Cone-beam computed tomography evaluation of the association of cortical plate proximity and apical root resorption after orthodontic treatment

Nakada, Tomoo; Motoyoshi, Mitsuru; Horinuki, Eri

doi:10.2334/josnusd.15-0566

Cited by 25 publications

(23 citation statements)

References 19 publications

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“…Though not significant, a tendency toward a greater horizontal retraction of the incisal edge (HRD) and less lingual tipping of the U1 (DU1/FH) were seen in the contact group. However, significant differences between root length decrease in U1s between the contact and noncontact groups indicated that U1-IC contact was very likely to contribute to significant root resorption, which was a similar finding to that of Chung et al 10 and Nakada et al 9 It was noted that, in some cases, lingual tipping of the incisors during retraction caused contact of the root apex with the labial cortical bone. However, the root apex was not necessarily the most susceptible to meeting the IC.…”

Section: Discussionsupporting

confidence: 83%

“…11 In past studies, the opening of the IC (the incisive foramen) was defined as the lowest point of the palatal wall. 9,11 However, in the present investigation, it was found that the concavity could be seen at the lowest point of the buccal wall. Therefore, the horizontal levels selected in this study were more incisal relative to U1s than in past studies.…”

Section: Discussioncontrasting

confidence: 66%

“…Nakada et al 9 believed that midline drift during orthodontic treatment may cause apical root resorption related to the IC but that lingual movement of the central incisors was also a contributing factor. Because of the oval shape of the IC and the tooth roots, the U1-IC distances were larger than the shortest distance between the two structures.…”

Section: Discussionmentioning

confidence: 99%

“…7,8 Approximation of the IC and U1 should also affect orthodontic retraction of the anterior teeth. Nakada et al 9 found that mesial movement of the root apex during orthodontic retraction might lead to its contact with the IC cortical plate and cause apical root resorption. Chung et al 10 noticed in two cases that in conducting en masse retraction with the help of orthodontic miniimplants, the root of one of the U1 made direct contact with the cortical plate of the IC and extensive root resorption was observed.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Contact of the incisive canal and upper central incisors causing root resorption after retraction with orthodontic mini-implants: A CBCT study

Pan

Chen

2018

The Angle Orthodontist

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Objectives: To explore risk factors for contact between the incisive canal (IC) and upper central incisors (U1) and to evaluate the relationship between contact and root resorption using cone-beam computer tomography (CBCT). Materials and Methods: This retrospective study used CBCT data of 33 patients treated by a senior orthodontist. Anterior teeth were retracted with mini-implants, and CBCT scans were taken before and after retraction. IC height and width, U1 lingual movement, and U1-IC distance and root length decrease were compared between contact and noncontact groups. Results: Sixteen U1 roots in 11 patients touched the IC. The contact group had lower positioned ICs (2.86 ± 1.10 mm) than the noncontact group (4.07 ± 1.72 mm). The middle of the U1 roots showed more lingual movement to ICs in the contact group (2.30 ± 1.20 mm) than in the noncontact group (1.07 ± 1.16 mm). Right central incisors were closer to the IC than were the left. Root length decreased significantly more in the contact group (2.63 ± 0.93 mm) than in the noncontact group (1.14 ± 0.83 mm). Conclusions: There is a risk for the U1 root to contact the IC during anterior retraction when the IC is lower positioned. This contact might cause external apical root resorption.

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Section: Discussionsupporting

confidence: 83%

Section: Discussioncontrasting

confidence: 66%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Contact of the incisive canal and upper central incisors causing root resorption after retraction with orthodontic mini-implants: A CBCT study

Pan

Chen

2018

The Angle Orthodontist

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“…Apical root resorption has been frequently reported in the maxillary incisor region [ 28 ]. In some cases, unexpected apical root resorption in maxillary incisors after anterior retraction has been reported to have occurred because of proximity or contact of the roots with the labial, palatal, or incisive canal cortical plates [ 29 , 30 ]. In clinical settings, several orthodontic treatments till date have been successfully performed solely with conventional cephalometric analysis.…”

Section: Discussionmentioning

confidence: 99%

Quantitative analysis of the relationship between maxillary incisors and the incisive canal by cone-beam computed tomography in an adult Japanese population

et al. 2017

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BackgroundIn setting goals for orthodontic treatment, determining the morphologies of the alveolar bone and maxillary incisor root is important for avoiding root resorption, dehiscence, and fenestration. This study aimed to analyze the configurational relationships among maxillary incisors, the alveolar border, and the incisive canal by cone-beam computed tomography (CBCT).MethodsCone-beam CT images of 93 orthodontic patients were evaluated for length of the incisive canal (L); angles between the palatal plane and the maxillary alveolar border (θ1), the incisive canal (θ2), and maxillary incisor (θ3); distance from the left maxillary incisor to the incisive canal (D); and cross-sectional areas of the incisive canal (CSAs) at three vertical levels. Comparison of variables between male and female patients was performed with the two-sample t test. Correlations between parameters were examined by Pearson’s correlation analysis and Bonferroni correction for multiple comparisons.ResultsMale patients exhibited significantly greater values of L than female patients. There were significant positive correlations between θ1 and θ2, θ2 and θ3, and θ3 and θ1. While the value of D was the lowest at the oral opening, that of the cross-sectional area of the incisive canal (CSA) was the greatest at the incisal root apex.ConclusionsThis study demonstrated that the incisive canal had large inter-individual variability, and the proximity between the incisive canal and the incisal root could not be precisely predicted by the conventional cephalograms. Therefore, pre-treatment CBCT examination should be recommended when a large amount of maxillary anterior retraction and/or intrusion is planned in orthodontic diagnosis.

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Effects of crown movement on periodontal biotype: a digital analysis

et al. 2018

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Orthodontic treatment has important correlations with periodontal changes. Various mechanical and biological factors are involved in determining such changes, but anatomical and morphological variables, generally addressed as periodontal biotype, play a key role. In measurement of such modifications, digital and non-contact reverse engineering technologies may be of tremendous advantage. The aim of this study is to retrospectively evaluate, in a series of digitized dental casts, some of the parameters addressing periodontal biotype and correlate them to extent and direction of tooth movement. Pre- (T0) and post-treatment (T1) dental casts of 22 patients were scanned by 3Shape TRIOS 3® scanner. A number of variables (crown ratio, gingival margin position, gingival contour, papillae position, gingival scallop) were investigated and their variations calculated after digital measurements on single casts at T0 and T1, or after direct measurement (T1 vs T0) on the superimposition and alignment of digital models. Univariate and multivariate statistics were then performed. No significant correlation was detected between the sagittal or vertical movement of dental crown and displacement of the gingival margin. On the other hand, vestibular gingival contour resulted significantly altered by vestibular and extrusion movements. Further studies are needed to ascertain the differential effect of bone and soft tissue on such modifications. The relationship between orthodontic treatment and the periodontium overcomes the consideration of gingival recession and includes all the concepts of periodontal biotype with its characteristics. Digital technologies and non-contact reverse engineering techniques now available have the potential to allow a more precise definition of such a relationship.

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Cone-beam computed tomography evaluation of the association of cortical plate proximity and apical root resorption after orthodontic treatment

Cited by 25 publications

References 19 publications

Contact of the incisive canal and upper central incisors causing root resorption after retraction with orthodontic mini-implants: A CBCT study

Contact of the incisive canal and upper central incisors causing root resorption after retraction with orthodontic mini-implants: A CBCT study

Quantitative analysis of the relationship between maxillary incisors and the incisive canal by cone-beam computed tomography in an adult Japanese population

Effects of crown movement on periodontal biotype: a digital analysis

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