External root resorption during orthodontic treatment in root-filled teeth and contralateral teeth with vital pulp: A clinical study of contributing factors

Lee, Yun Ju; Lee, Tae Yeon

doi:10.1016/j.ajodo.2015.06.027

Cited by 41 publications

(60 citation statements)

References 33 publications

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“…Root resorption susceptibility following the application of an orthodontic force can be associated with tooth type (with a greater risk for the upper incisor)[7], treatments with extraction[7–9], the presence of supraocclusion or open bite[7], treatment duration[10], root resorption before treatment[8,9], and root morphology[7–9]. Although root resorption can occur with or without orthodontic treatment, research in this area indicates that RR is influenced by a complex genetic trait[3,6,11,12], individual predisposition and multifactorial etiology[4,12–16].…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional characterization of root morphology for maxillary incisors

et al. 2017

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The aim of this study was to test the reproducibility of three-dimensional (3D) surface models of maxillary incisors and to propose a characterization of root morphology. The sample was comprised of pre-treatment cone-beam computed tomography (CBCT) images of fifty-five patients. The CBCTs were used to construct 3D surface models of the maxillary incisors. The reproducibility of surface models was tested by repeated construction of them by two observers. A 3D surface model that corresponded to the average of all lateral and all central incisors was generated. 3D surface distances and vector differences were calculated for each individual tooth and the average of the teeth considered. The corresponding points on the 3D surface mesh for each subgroup were compared statistically to those of the neutral subgroup using shape analysis MANCOVA and Hotelling’s t-statistic (p < 0.05). Repeated construction of surface models demonstrated adequate inter-rater reproducibility. The distribution of 3D models into root morphology subgroups was: blunt (11% and 26% of the central and lateral incisors, respectively), conical (15% of the central incisors), long (27% and 20% of the central and lateral incisors, respectively), and short (15% and 4% of the central and lateral incisors, respectively). Compared to the neutral average, statistically significant differences in root morphology were found for blunt, long, conical, and short central incisors and for blunt, long, and short lateral incisors. We can conclude that 3D surface models construction for upper incisors is reproducible. 3D shape analysis using CBCT images allows a phenotypic characterization of incisor root morphology.

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Section: Introductionmentioning

confidence: 99%

Three-dimensional characterization of root morphology for maxillary incisors

et al. 2017

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“…Impacted teeth may be asymptomatic or may be associated with pathologies such as caries, pericoronitis, odontogenic tumors and cysts, and root resorptions of the adjacent tooth [1,2]. External root resorption (ERR) of the second molar is a pathological process which occurs on the surface of the root and which is induced by local in lammation or mechanical stress [2].…”

Section: Introductionmentioning

confidence: 99%

“…Cone beam computed tomography provides a more precise view of the dental structures, resulting in a more exact diagnosis [1].…”

Section: Introductionmentioning

confidence: 99%

External Root Resorption associated with Impacted Third Molars: A Case Report

Marano¹

2017

J Oral Health Craniofac Sci

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The indications for impacted third molar extraction include the prevention of dental reabsorption on the adjacent tooth. Resorption can be classifi ed as physiological (when deciduous teeth are exfoliated) or pathological (when caused by injury or irritation to the periodontal ligament). Many causes can trigger external root resorption (ERR), the most common cause of which is orthodontic forces. The most common cases of ERR involve impacted third molars which, due to the lack of space for their eruption, generate a greater chance of ERR on the distal portion of the second molar. This pathology is becoming progressively more frequent in clinical dental care. Periapical and panoramic radiographs are used to aid in diagnosis, as is cone beam computed tomography. In cone beam computed tomography scans, radiolucent areas with irregular gaps are detected; these gaps represent a signifi cant loss of dental material. The objectives of this article were to report a case of second molar resorption triggered by an impacted third molar and to perform a review of the literature on the causes of external root resorption. Ideally, this information will aid dental clinicians (and orthodontists in particular) in understanding the features of this pathology so that they may recommend preventive third molar extraction when necessary.

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“…In this case, teeth are usually asymptomatic and their pulpal vitality and normal function are unaffected, unless there is a disruption of the blood supply because the pressure of the orthodontic treatment is extremely high. In that case the treatment should be halted (Aziz et al, 2014;Lee, Lee, 2016).…”

Section: Chapter 5 Discussionmentioning

confidence: 99%

“…Most cases involve the apical and middle thirds of the root (Gunraj, 1999), but they may begin in the cervical third of the root and extend apically. Usually, external root resorption has a progressive, painless course, and its occurrence is fairly common undesirable side effect during orthodontic treatment that is difficult to predict and repair (Kaku et al, 2014;Lee, Lee, 2016). A previous study reported a 4.8 times increase in the incidence of external root resorption after orthodontic treatment (from 15% before treatment to 73% after treatment) (Lupi et al, 1996).…”

Section: Chapter 1 Introductionmentioning

confidence: 99%

The impact on diagnostic yield of the scan mode of cone beam CT images in artificial external root resorption

Melo¹,

Leonardo²

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Introduction: Root resorption is an undesired but frequent side effect of orthodontic treatment. Several studies have already aimed to evaluate the performance of CBCT on this topic. However, none have addressed the peculiarities of the most common daily orthodontic scenario. The aim of the study was to evaluate the influence of CBCT scans on the diagnosis of artificial external root resorption in the apical third of anterior teeth. Materials and methods: One hundred extracted human anterior teeth were randomly assigned to 2 uneven groups (51 as the control and 49 as the experimental group). A limited area of the apical third of the root of the teeth of the experimental group was selected and a buffer solution was used to induce tooth subsurface demineralization. Before CBCT image acquisition, each tooth was coated with an approximately 0.3 mm thick layer of utility wax to simulate the radiographic appearance of the periodontal space and placed into an empty mandibular anterior socket of a partially edentulous dry human mandible. The mandible was placed into a polystyrene box filled with water prior to the CBCT examination to simulate soft-tissue attenuation and scattering. The CBCT images were obtained on an i-CAT unit (i-CAT Next Generation, Imaging Sciences International, Hatfield, PA) according to three protocols: (I) half scan (180°), 0.40 mm voxel size; (II) full scan (360°), 0.40 mm voxel size; and (III) full scan (360°), 0.125 mm voxel size. The 300 resultant CBCT DICOM volumes were imported into InVivo software (InVivo5, Anatomage, San Jose, CA) for evaluation by three blinded, previously calibrated observers using a fivepoint confidence rating scale. Cohen's kappa was used to calculate observers' agreement. vi The diagnostic values of sensitivity (Sn), specificity (Sp) and accuracy (Ac) were performed by pooling observer responses for every image modality. Receiver operating characteristic (ROC) were built and the areas under the curve (AUC) were calculated. The Sn, Sp and Ac values were compared by Cochran's Q test. The AUC values were compared by Mann-Whitney U test. Results: The observers' agreement ranged from 0.63 to 0.71, which was interpreted as a substantial agreement. Protocol III (0.125 mm voxel size) displayed the highest Sn (81.63 %), Ac (80.67%) and AUC (0.807). There were statistically significant differences between protocol III and the other two protocols (p < 0.001). The specificity of protocol I (84.97 %) was greater than that of protocols II (69.93 %) and III (79.74 %); however statistically significant difference was only found between protocols I and II (p = 0.005). Conclusion: Although there was no difference in accuracy between the degrees of rotation (half and full scan) within the same voxel size (0.4 mm), there was a considerable difference between those and the smallest voxel size (0.125 mm). In fact, it may be suggested that a more dedicated, high resolution scan should be acquired when one intends to investigate the early stage of external root resorption during orthodontic ...

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External root resorption during orthodontic treatment in root-filled teeth and contralateral teeth with vital pulp: A clinical study of contributing factors

Cited by 41 publications

References 33 publications

Three-dimensional characterization of root morphology for maxillary incisors

Three-dimensional characterization of root morphology for maxillary incisors

External Root Resorption associated with Impacted Third Molars: A Case Report

The impact on diagnostic yield of the scan mode of cone beam CT images in artificial external root resorption

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