Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery

Cevidanes, Lúcia Helena Soares; Bailey, L’Tanya J.; Tucker, Scott; Styner, Martin; Mol, André; Phillips, Ceib; Turvey, Timothy A.

doi:10.1016/j.ajodo.2005.03.029

Cited by 190 publications

(138 citation statements)

References 25 publications

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“…The advantages of CBCT over conventional CT or dental films include low radiation dose, lower cost, excellent tissue contrast, elimination of blurring and overlapping of adjacent teeth, and high spatial resolution. [14][15][16][17][18] The goal of this study was to evaluate the vertical alveolar bone levels and thickness around the maxillary and mandibular incisors of adult skeletal Class III patients by using 3-D CBCT images. The hypothesis of this study was that the bone loss is not different in the maxillary and mandibular incisors.…”

Section: Introductionmentioning

confidence: 99%

Alveolar Bone Loss around Incisors in Surgical Skeletal Class III Patients

Kim

Park

Kook

2009

The Angle Orthodontist

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Objective: To test the hypothesis that there is no difference in the vertical alveolar bone levels and alveolar bone thickness around the maxillary and mandibular central incisors in surgically treated skeletal Class III malocclusion patients. Materials and Methods:The study sample comprised 20 Korean patients with skeletal Class III malocclusion with anterior crossbite and openbite (9 male, 11 female, mean ages 24.1). Threedimensional cone beam computed tomography images were taken at least 1 month before the orthognathic surgery, and sagittal slices chosen at the labio-lingually widest point of the maxillary and mandibular right central incisor were evaluated. Measurement of the amount of vertical alveolar bone levels and alveolar bone thickness of the labial and lingual plate at the root apex was made using the SimPlant Pro 12.0 program. Results:The mandibular incisors showed reduced vertical alveolar bone levels than the maxillary incisors, especially on the lingual side. The alveolar bone thickness was significantly greater on the lingual side in the maxillary incisors, whereas the mandibular incisors exhibited an opposite result (P Ͻ .05). The percentage of vertical bone loss to root length showed a statistically significant difference between the upper labial and lower labial alveolar bone and also between the upper lingual and lower lingual alveolar bone, showing more bone loss in the lower incisors (P Ͻ .001). Conclusions:The hypothesis is rejected. For the skeletal Class III patients undergoing orthognathic surgery, special care should be taken to prevent or not aggravate preexisting alveolar bone loss in the anterior teeth, especially in the mandible. (Angle Orthod. 2009;79:676-682.)

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Section: Introductionmentioning

confidence: 99%

Alveolar Bone Loss around Incisors in Surgical Skeletal Class III Patients

Kim

Park

Kook

2009

The Angle Orthodontist

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“…However, patients usually evaluate their own soft tissue esthetics on the basis of how they look in a frontal view. Therefore, three-dimensional (3D) imaging methods, such as 3D computed tomography [3][4][5][6] and 3D facial scan images (3D-FSIs), [7][8][9][10][11][12] are used to analyze and evaluate the soft tissues of the entire face.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Lim¹,

Chu²,

Lee³

et al. 2010

The Angle Orthodontist

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Objective: To evaluate whether mandibular setback surgery (MSS) for Class III patients would produce gradients of three-dimensional (3D) soft tissue changes in the vertical and transverse aspects. Materials and Methods: The samples consisted of 26 Class III patients treated with MSS using bilateral sagittal split ramus osteotomy. Lateral cephalograms and 3D facial scan images were taken before and 6 months after MSS, and changes in landmarks and variables were measured using a Rapidform 2006. Paired and independent t-tests were performed for statistical analysis. Results: Landmarks in the upper lip and mouth corner (cheilion, Ch) moved backward and downward (respectively, cupid bow point, 1.0 mm and 0.3 mm, P , .001 and P , .01; alar curvature-Ch midpoint, 0.6 mm and 0.3 mm, both P , .001; Ch, 3.4 mm and 0.8 mm, both P , .001). However, landmarks in stomion (Stm), lower lip, and chin moved backward (Stm, 1.6 mm; labrale inferius [Li], 6.9 mm; LLBP, 6.9 mm; B9, 6.7 mm; Pog9, 6.7 mm; Me9, 6.6 mm; P , .001, respectively). Width and height of upper and lower lip were not altered significantly except for a decrease of lower vermilion height (Stm-Li, 1.7 mm, P , .001). Chin height (B9-Me9) was decreased because of backward and upward movement of Me9 (3.1 mm, P , .001). Although upper lip projection angle and Stm-transverse projection angle became acute (Ch Rt -Ls-Ch Lt , 5.7u; Ch Rt -Stm-Ch Lt , 6.4u, both P , .001) because of the greater backward movement of Ch than Stm, lower lip projection angle and Stm-vertical projection angle became obtuse (Ch Rt -Li-Ch Lt , 10.8u; LsStm-Li, 23.5u, both P , .001) because of the larger backward movement of Li than labrale superius (Ls). Conclusions: Three-dimensional soft tissue changes in Class III patients after MSS exhibited increased gradients from upper lip and lower lip to chin as well as from Stm to Ch. (Angle Orthod. 2010;80:896-903.)

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“…The 3-D images are generated and optimized after selecting the region of interest and adjusting the angle and grey level [18]. CBCT produces 3-D information on the facial skeleton and teeth, and also it is increasingly being used in many of the dental specialities, including orthodontics, orthognathic surgery, trauma and implantology [28,29]. Moreover, CBCT is able to clearly show the intraosseous location, inclination, and morphology of impacted or supernumerary teeth, as well as their distances from adjacent roots, teeth, and the cortical bone [25].…”

Section: Of 185 Patients With Supernumerarymentioning

confidence: 99%

Application of Cone-Beam Computed Tomography (CBCT) in diagnosis and evaluation of Supernumerary Teeth

Sah¹,

Fang

Gupta³

2017

Janaki Med. Coll. J. Med. Sci.

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Background and Objectives: The aim of this paper is to describe the application of a newly developed three-dimensional imaging system, Cone-Beam Computed Tomography in the diagnosis and evaluation of supernumerary teeth.Material and Methods: One hundred and eighty-five patients with supernumerary teeth (134 males and 51 females) were included in this study. Patients ranged in age from 6 to 38 years. Supernumerary teeth were detected by clinical examination and conventional radiographs. Moreover, careful investigation for more details was made with the cone beam computed tomography. Supernumerary teeth which were detected with the examinations of the cone beam computed tomography images were analyzed according to the number, location, shape and position.Results: Males were affected more than females in a ratio of 2.6:1. 95 % supernumerary teeth were located in maxilla and 5 % in the mandible. 71.6% of supernumerary teeth were conical in shape. 93.6% supernumerary teeth were impacted and 6.4% were erupted. A total of 198 supernumerary teeth were found to be present in palatal/lingual side and 24 were found on the buccal side. 80.5 % of the patients had one, 18.9 % had two, and 0.5 % had three supernumeraries.Conclusion: Detailed examinations and evaluations of these teeth with Cone-Beam Computed tomography (CBCT) yields accurate 3-dimensional pictures of supernumerary teeth, local dental and bony structures which are very beneficial in terms of proper diagnosis and treatment planning and preventing complications which may occur. Janaki Medical College Journal of Medical Sciences (2017) Vol. 5(1): 5-15

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Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery

Abstract: Introduction-The purpose of this study was to assess alterations in the 3-dimensional (3D) position of the mandibular rami and condyles in patients receiving either maxillary advancement and mandibular setback or maxillary surgery only.

Cited by 190 publications

References 25 publications

Alveolar Bone Loss around Incisors in Surgical Skeletal Class III Patients

Alveolar Bone Loss around Incisors in Surgical Skeletal Class III Patients

Three-dimensional evaluation of soft tissue change gradients after mandibular setback surgery in skeletal Class III malocclusion

Application of Cone-Beam Computed Tomography (CBCT) in diagnosis and evaluation of Supernumerary Teeth

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