Displacement in root apex and changes in incisor inclination affect alveolar bone remodeling in adult bimaxillary protrusion patients: a retrospective study

Mao, Huimin; Yang, Andi; Pan, Yue; Li, Houxuan; Lei, Lang

doi:10.1186/s13005-020-00242-2

Cited by 16 publications

(19 citation statements)

References 47 publications

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“…Some articles were excluded after full-text review for the following reasons: Lack of data referring to BBT [ 65 , 66 , 67 , 68 ], measurement not by (CB)CT scan [ 69 ] patients matching the exclusion criteria [ 19 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 ], patients with implants [ 85 ], patients without teeth [ 86 ], data not displayed as mean and SD [ 56 ], site or kind of measurement not adequate [ 19 , 62 , 64 , 77 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 , 100 , 101 , 102 , 103 , 104 , 105 , 106 , 107 ,…”

Section: Resultsmentioning

confidence: 99%

Buccal Bone Thickness in Anterior and Posterior Teeth—A Systematic Review

et al. 2021

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(1) Background: Immediate dental implant placement has been a subject of great interest over the last decade. Here, information regarding the anatomy and bone thickness of the jaw prior to dental implant placement is crucial to increase the surgery’s success and the patient’s safety. The clinical premises for this approach have been controversially discussed. One of those heavily discussed premises is a buccal bone thickness of at least 1 mm thickness. This meta-analysis aims to systematically review buccal bone thickness (BBT) in healthy patients. Thus, the feasibility of immediate dental implant placement in daily practice can be assessed. (2) Methods: A search in the electronic databases was performed to identify articles reporting on BBT that was measured by computed tomography in adults. (3) Results: We were able to find 45 studies, including 4324 patients with 25,452 analyzed teeth. The analysis showed a BBT at the alveolar crest of 0.76 ± 0.49 mm in the maxillary frontal and of 1.42 ± 0.74 mm in the maxillary posterior region. In the mandible, the average measured values were similar to those in the maxilla (front: 0.95 ± 0.58 mm; posterior: 1.20 ± 0.96 mm). In the maxillary frontal region 74.4% and in the mandibular frontal region 61.2% of the crestal buccal bones showed widths <1 mm. (4) Conclusions: In more than 60% of the cases, the BBT at the alveolar crest is <1 mm in maxillary and mandibular frontal regions. This anatomic data supports careful pre-surgical assessment, planning of a buccal graft, and critical selection of indication for immediate implant placement, especially in the maxillary and mandibular frontal and premolar region.

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Section: Resultsmentioning

confidence: 99%

Buccal Bone Thickness in Anterior and Posterior Teeth—A Systematic Review

et al. 2021

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“…The bodily retraction would bring about the proximity of the root apex to the palatal cortex plate and abundant alveolar bone resorption [35]. Therefore, bodily retraction of considerable distance is not ideal for the treatment of bimaxillary dentoalveolar protrusion, and careful tooth movement is necessary, considering the location of the tooth within the alveolar bone [30,36]. In other words, clinicians should place the anterior teeth in the most esthetic position through initial uprighting and some translation rather than focusing on the retraction of skeletal points A and B.…”

Section: Discussionmentioning

confidence: 99%

Three-Dimensional Digital Image Analysis of Skeletal and Soft Tissue Points A and B after Orthodontic Treatment with Premolar Extraction in Bimaxillary Protrusive Patients

Lim

Yang

Byun

et al. 2022

Biology

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Aim. To investigate the effect of changes in incisor tip, apex movement, and inclination on skeletal points A and B and characterize changes in skeletal points A and B to the soft tissue points A and B after incisor retraction in Angle Class I bimaxillary dentoalveolar protrusion. Methods. Twenty-two patients with Angle Class I bimaxillary dentoalveolar protrusion treated with four first premolar extractions were included in this study. The displacement of skeletal and soft tissue points A and B was measured using cone-beam computed tomography (CBCT) using a three-dimensional coordinate system. The movement of the upper and lower incisors was also measured using CBCT-synthesized lateral cephalograms. Results. Changes in the incisal tip, apex, and inclination after retraction did not significantly affect the position of points A and B in any direction (x, y, z). Linear regression analysis showed a statistically significant relationship between skeletal point A and soft tissue point A on the anteroposterior axis (z). Skeletal point A moved forward by 0.07 mm, and soft tissue point A moved forward by 0.38 mm, establishing a ratio of 0.18: 1 (r = 0.554, p < 0.01). Conclusion. The positional complexion of the skeletal points A and B was not directly influenced by changes in the incisor tip, apex, and inclination. Although the results suggest that soft tissue point A follows the anteroposterior position of skeletal point A, its clinical significance is suspected. Thus, hard and soft tissue analysis should be considered in treatment planning.

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“…On the other hand, in the past, the locations of the incisors were usually detected by measuring the thickness of the alveolar bone at the root apex without distinguishing between cortical and cancellous bone [ 13 ]. In this study, we improved the measurement methods of Mao and other researchers [ 14 , 15 ]: we evaluated the alveolar-bone morphology at the mandibular central incisors by measuring the thicknesses and areas of the cancellous and cortical bone at the level of the CEJ; 3, 6, and 9 mm below the CEJ; midway between the CEJ and the root apex; and at the root apex. Compared with past methods, we refined the measurement range and increased the observation angle to provide an all-round picture of the heterogeneous changes in alveolar-bone morphology.…”

Section: Discussionmentioning

confidence: 99%

Relationship between alveolar-bone morphology at the mandibular incisors and their inclination in adults with low-angle, skeletal class III malocclusion—A retrospective CBCT study

et al. 2022

PLoS ONE

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Objective To quantitatively study the effect of the labial inclination of the mandibular central incisors on the surrounding cortical and cancellous-bone morphology among patients with low-angle, skeletal class III malocclusion, by using cone-beam computed-tomography (CBCT) imaging. Materials and methods The CBCT images of 60 patients with low-angle, skeletal class III malocclusion were divided into lingual-inclination, upright, and labial-inclination groups. The height of the alveolar bone and the thickness and area of the cortical, cancellous, and total alveolar bone were measured separately on each side of the mandibular central incisors. Results The thickness of the labial cortical bone from 6 mm below the cementoenamel junction (CEJ) to the root apex; the thickness of the labial cancellous bone at the root apex; the total thickness of the alveolar bone at the root apex; the area of labial cortical bone; the total area of labial alveolar bone; and the height of the labial alveolar bone were highest in the labial-inclination group (all P<0.05). All these variables were positively correlated with the labial inclination of the mandibular central incisors (all P<0.05). There were no statistical differences between the groups for any of the measurements on the lingual side of the teeth (P>0.05). Conclusion The morphology of the alveolar bone on the labial but not the lingual side of the mandibular central incisors was statistically significantly correlated with the labial inclination of those teeth in patients with low-angle, skeletal class III malocclusion.

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Displacement in root apex and changes in incisor inclination affect alveolar bone remodeling in adult bimaxillary protrusion patients: a retrospective study

Cited by 16 publications

References 47 publications

Buccal Bone Thickness in Anterior and Posterior Teeth—A Systematic Review

Buccal Bone Thickness in Anterior and Posterior Teeth—A Systematic Review

Three-Dimensional Digital Image Analysis of Skeletal and Soft Tissue Points A and B after Orthodontic Treatment with Premolar Extraction in Bimaxillary Protrusive Patients

Relationship between alveolar-bone morphology at the mandibular incisors and their inclination in adults with low-angle, skeletal class III malocclusion—A retrospective CBCT study

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