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1.
Head Face Med ; 17(1): 3, 2021 Feb 03.
Artigo em Inglês | MEDLINE | ID: mdl-33531044

RESUMO

BACKGROUND: Orthodontic root resorptions are frequently investigated in small animals, and micro-computed tomography (µCT) enables volumetric comparison. Despite, due to overlapping histograms from dentine and bone, accurate quantification of root resorption is challenging. The present study aims at (i) validating a novel automated approach for tooth segmentation (ATS), (ii) to indicate that matching of contralateral teeth is eligible to assess orthodontic tooth movement (OTM) and root resorption (RR), (iii) and to apply the novel approach in an animal trial performing orthodontic tooth movement. METHODS: The oral apparatus of three female mice were scanned with a µCT. The first molars of each jaw and animal were segmented using ATS (test) and manually (control), and contralateral volumes were compared. Agreement in root volumes and time efficiency were assessed for method validation. In another n = 14 animals, the left first upper molar was protracted for 11 days at 0.5 N, whereas the contralateral molar served as control. Following ATS, OTM and RR were estimated. RESULTS: ATS was significantly more time efficient compared to the manual approach (81% faster, P < 0.01), accurate (volume differences: - 0.01 ± 0.04 mm3), and contralateral roots had comparable volumes. Protracted molars had significantly lower root volumes (P = 0.03), whereas the amount of OTM failed to reveal linear association with RR (P > 0.05). CONCLUSIONS: Within the limits of the study, it was demonstrated that the combination of ATS and registration of contralateral jaws enables measurements of OTS and associated RR in µCT scans.


Assuntos
Reabsorção da Raiz , Animais , Feminino , Camundongos , Dente Molar/diagnóstico por imagem , Roedores , Reabsorção da Raiz/diagnóstico por imagem , Técnicas de Movimentação Dentária , Raiz Dentária , Microtomografia por Raio-X
2.
Angle Orthod ; 90(5): 648-654, 2020 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-33378476

RESUMO

OBJECTIVES: To compare the amount of en-masse retraction with or without piezocision corticotomy, to assess the type of tooth movement, to evaluate root integrity after retraction, and to record reported pain levels. MATERIALS AND METHODS: This randomized, controlled clinical trial included 26 orthodontic patients requiring premolar extraction. The patients were divided into two groups: (1) an extraction with piezocision corticotomy group (PCG) and (2) an extraction-only group, which served as the control group (CG). Cone-beam computed tomography images were acquired before and 4 months after the initiation of en-masse retraction utilizing miniscrews. The following variables were assessed: the amount of en-masse retraction, incisor inclination, incisor and canine root resorption, and patient-reported pain. RESULTS: Twelve and 11 participants completed the entire study in the PCG and CG, respectively. The amount of en-masse retraction was significantly greater in the PCG compared to the CG (mean = 4.8 ± 0.57 mm vs 2.4 ± 0.33 mm, respectively [P < .001]). There was also significantly less tipping and root resorption of incisors in the PCG (P < .05). The reported pain was significantly higher on the first day in the PCG compared to the CG (P < .001); however, it became similar between the groups after 24 hours. CONCLUSIONS: Piezocision corticotomy enhanced the amount of en-masse retraction two times more with less root resorption. However, future studies are required to assess the long-term effects of this technique.


Assuntos
Procedimentos de Ancoragem Ortodôntica , Reabsorção da Raiz , Dente Pré-Molar/diagnóstico por imagem , Dente Pré-Molar/cirurgia , Humanos , Incisivo , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/etiologia , Técnicas de Movimentação Dentária
3.
Angle Orthod ; 90(4): 524-531, 2020 07 01.
Artigo em Inglês | MEDLINE | ID: mdl-33378490

RESUMO

OBJECTIVE: To determine the effect of alveolar decortication on orthodontically induced root resorption. MATERIALS AND METHODS: A total of 24 male Wistar rats (14 week old) were used. The rats were randomly divided into one of the following three groups: group 1 (control group), orthodontic tooth movement (OTM) for 2 weeks; group 2, OTM for 2 weeks + two alveolar decortications (2AD); group 3, OTM for 2 weeks + four alveolar decortications (4AD). The first molar was moved mesially for 2 weeks. Micro computed tomography was used to analyze root volume. In addition, histological sections were stained with Tartrate Resistant Acid Phosphatase (TRAP) to quantify the osteoclast number. RESULTS: The buccal root volume in OTM + 4AD group was decreased by 8.92% and 6.11% when compared with the OTM-only group and OTM + 2AD group, respectively. Similarly, the other four root volumes in the OTM + 4AD group was decreased by 8.99% and 5.24% when compared with the OTM-only group and OTM + 2AD group, respectively. There was a decrease in buccal root density in the OTM + 4AD group by 4.66% and 3.56% when compared with the OTM-only group and the OTM + 2AD group, respectively. In addition, there was an increase in the number of osteoclasts by 195.73% and 98.74% in OTM + 4AD group in comparison with the OTM and OTM + 2AD group. CONCLUSIONS: The amount of orthodontically induced root resorption was positively correlated with the extent of surgical injury used to accelerate orthodontic tooth movement.


Assuntos
Reabsorção da Raiz , Animais , Masculino , Osteoclastos , Ratos , Ratos Wistar , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/etiologia , Técnicas de Movimentação Dentária/efeitos adversos , Raiz Dentária/diagnóstico por imagem , Microtomografia por Raio-X
4.
Dental Press J Orthod ; 25(5): 24-29, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33206825

RESUMO

OBJECTIVE: The present study aimed at comparing the external lateral root resorption (ELRR) and external apical root resorption (EARR) between teeth moved through the atrophic edentulous ridge and those undergoing the usual orthodontic movement. METHODS: Fifty-four premolars were evaluated, where 27 of them had been moved toward the edentulous ridge (Group 1) and 27 from the same patient, had not been translated, which comprised the control group (Group 2). ELRR was evaluated by 0-3 scores and EARR was evaluated by 0-4 scores, before and after movement. Measurements were compared by Kruskal-Wallis and Student-Newman-Keuls tests. RESULTS: ELRR increased statistically only in the Group 1 (p< 0.05). After orthodontic treatment, it was observed that almost 56% (n = 15) of teeth in Group 1 presented scores 2 and 3, while Group 2 presented scores 2 and 3 in about 11% (n= 3) of the teeth. EARR increased in both groups after orthodontic movement, however, statistically analyses showed no significant differences between groups (p> 0.05). CONCLUSIONS: Orthodontic movement into the atrophic edentulous ridge is subject to a greater lateral external root resorption.


Assuntos
Reabsorção da Raiz , Dente Pré-Molar , Humanos , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/etiologia , Técnicas de Movimentação Dentária
6.
Dental Press J Orthod ; 25(4): 16-22, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32965382

RESUMO

INTRODUCTION: When miniplates are used as anchoring for orthodontic mechanics for anterior open bite correction by retraction of anterior teeth and posterior teeth intrusion and retraction, orthodontically induced inflammatory external apical root resorption is clinically negligible. METHODS: A homogeneous sample of 32 patients was used, and the roots of the teeth were compared on CT scans performed before and after orthodontic treatment. RESULTS: The observed root resorption was minimal, and this can be explained by the uniform distribution of forces in several teeth, simultaneously, in the set of the dental arch and in the bone that supports the teeth. CONCLUSION: The most important thing to prevent root resorption in orthodontic practice, besides being concerned with the intensity of the applied forces, is to be careful with its distribution along the roots of each tooth, in the dental arch and in the bone that supports the teeth.


Assuntos
Mordida Aberta/diagnóstico por imagem , Mordida Aberta/terapia , Procedimentos de Ancoragem Ortodôntica , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/etiologia , Reabsorção de Dente , Humanos , Técnicas de Movimentação Dentária/efeitos adversos
8.
Am J Orthod Dentofacial Orthop ; 158(5): 700-709, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32950335

RESUMO

INTRODUCTION: External apical root resorption is nearly ubiquitous in people treated orthodontically. This study predicted the extent of external apical root resorption by the vector of the incisor movement. METHODS: Cone-beam computed tomography scans of 93 white American adolescents (45 boys, 48 girls) with a Class I malocclusion who received comprehensive orthodontics were analyzed. Half were treated with 4 first-premolar extractions, and the others were treated without extractions. An x, y, z coordinate system was registered on the maxillae, superimposing on foramina, to quantify vectors of maxillary incisor movements. Multiple linear regression identified significant predictors of resorption for each incisor. RESULTS: Strongly predictive models (R2 = 77%-86%) were obtained. All directions of incisor movement tested (anteroposterior, mediolateral, craniocaudal, torquing) increased the risk of resorption in a dose-response fashion. Intrusion was most damaging. The patient's sex, age, and duration of treatment were not predictive. CONCLUSIONS: Root resorption is a very frequent consequence of tooth movement, especially intrusion and torquing, though no direction is harmless, and most corrections occur in combination. Incisor apical resorption was significantly greater in the extraction sample (ca 0.5 mm).


Assuntos
Reabsorção da Raiz , Técnicas de Movimentação Dentária , Adolescente , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Incisivo/diagnóstico por imagem , Masculino , Maxila/diagnóstico por imagem , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/etiologia , Ápice Dentário , Técnicas de Movimentação Dentária/efeitos adversos , Raiz Dentária
9.
Acta Odontol Latinoam ; 33(1): 14-21, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32621594

RESUMO

The aim of this study was to evaluate the influence of spatial resolution (line pairs per millimetre - lp/mm) on the diagnosis of simulated external root resorption (ERR) in multi-rooted teeth by using digital periapical radiography. Forty human mandibular molars (80 roots) were used. The roots were divided into the following groups (n = 10): control without root filling (WORF), control with root filling (WRF), small ERRWORF, small ERR-WRF, moderate ERR-WORF, moderate ERR-WRF, extensive ERR-WORF and extensive ERR-WRF. Four digital radiographs (phosphor storage plates - PSP system) were taken of each tooth in three angulations. The PSPs were scanned with 10, 20, 25 and 40 lp/mm. All images were assessed by three endodontists who used a five-point scale for presence and absence of ERR and classified its location (cervical, middle or apical third). ROC curves and one-way ANOVA were performed (p < 0.01). Diagnosis of ERR in nonroot-filled teeth showed higher values of sensitivity for 20 lp/mm and higher values of both specificity and accuracy for 40 lp/mm. In root-filled teeth, sensitivity and accuracy were higher for 25 lp/mm and spatial resolution had no influence on specificity. The best resolution for diagnosis of small and extensive ERR was 25 lp/mm, whereas for moderate ERR, it was 40 lp/mm. Cervical ERR was the most difficult to diagnose, regardless of the spatial resolution. Higher spatial resolutions have improved the radiographic diagnosis of simulated ERR in multi-rooted teeth and this should be considered when performing digital radiographs.


Assuntos
Dente Molar/diagnóstico por imagem , Radiografia Dentária Digital/métodos , Reabsorção da Raiz/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico , Humanos , Obturação do Canal Radicular
10.
J Oral Maxillofac Surg ; 78(9): 1467-1477, 2020 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-32504563

RESUMO

PURPOSE: Impacted third molars (M3s) may lead to external root resorption (ERR) and dental caries (DC) in the adjacent second molars (M2s). The aim of this study was to identify the risk factors for ERR and DC in M2s associated with impacted M3s. MATERIALS AND METHODS: We implemented a cross-sectional study and enrolled a sample composed of patients with M3s and M2s present and cone-beam computed tomography (CBCT) scans available for review. If there was contact between the M2 and the adjacent M3 and the border of radiolucency was more distinct, the case was considered ERR. Apart from that, the case was considered DC. Potential predictor variables were defined as age, gender, tooth location, M2-M3 contact, root development in M3, M3 inclination, M3 impaction type, and M3 follicular diameter. Outcomes of the study were DC and ERR in M2s. CBCT was used to detect the presence of DC and ERR in M2s. RESULTS: A total of 250 eligible images of M3s in the upper and lower jaws of 167 patients were included. The mean age of the patients with CBCT images available was 26.08 ± 4 years (range, 18 to 40), and 43.6% of the patients were men. Factors associated with a significantly increased frequency of ERR in M2s included maxillary location, presence of M2-M3 contact, and mesioangular inclination (P < .005). DC in M2s was significantly more likely to occur in those with absence of contact between M2 and M3 (P < .005). CONCLUSIONS: The results of this study showed an increased risk of ERR to be associated with maxillary molars, mesioangular inclination, and presence of M2-M3 contact. The variable associated with an increased risk of DC was the absence of M2-M3 contact.


Assuntos
Cárie Dentária , Reabsorção da Raiz , Dente Impactado , Adolescente , Adulto , Tomografia Computadorizada de Feixe Cônico , Estudos Transversais , Cárie Dentária/diagnóstico por imagem , Humanos , Masculino , Dente Molar/diagnóstico por imagem , Dente Serotino/diagnóstico por imagem , Estudos Retrospectivos , Fatores de Risco , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/etiologia , Dente Impactado/diagnóstico por imagem , Adulto Jovem
11.
Artigo em Inglês | MEDLINE | ID: mdl-32423729

RESUMO

OBJECTIVES: The aim of this study was to evaluate the efficacy of different high-resolution cone beam computed tomography protocols in the diagnosis of chemically simulated external root resorption (ERR). STUDY DESIGN: ERR was simulated in 3 sizes by using an acid decalcification protocol in the cervical, middle, and apical thirds of 30 single-rooted premolars. Four scans of each tooth were acquired with different voxel sizes: 0.080, 0.085, 0.120, and 0.133 mm. The images were analyzed by 2 blinded evaluators for the presence of ERR. The evaluation of diagnostic performance was based on receiver operating characteristic (ROC) curve analysis. RESULTS: No statistically significant differences were found in the detection of ERR with regard to lesion sizes or the different root thirds. Areas under the ROC curve were 0.901, 0.892, 0.887, and 0.767 for voxel sizes of 0.080, 0.085, 0.120, and 0.133 mm, respectively. Voxel sizes of 0.080 and 0.085 mm presented significantly larger areas under the ROC curve compared with the voxel size of 0.133 mm. There were no statistically significant differences among the protocols with the use of voxel sizes of 0.080, 0.085, and 0.120 mm. CONCLUSIONS: Cone beam computed tomography examinations with higher-resolution protocols demonstrated better performance in the diagnosis of ERR. Further investigations using simulations that more closely resemble the actual ERR process are warranted.


Assuntos
Reabsorção da Raiz , Dente Pré-Molar/diagnóstico por imagem , Tomografia Computadorizada de Feixe Cônico , Humanos , Cintilografia , Reabsorção da Raiz/diagnóstico por imagem , Sensibilidade e Especificidade , Raiz Dentária
13.
Angle Orthod ; 90(1): 56-62, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31306075

RESUMO

OBJECTIVE: To evaluate the difference in orthodontic root resorption between root-filled and vital teeth. MATERIAL AND METHODS: Sixteen individuals who required bilateral premolar tooth extraction due to orthodontic treatment and had a previously root-filled premolar tooth on one side were included in the study. The experimental group consisted of root-filled premolar teeth, and the control group consisted of contralateral vital premolar teeth. A 150-g buccally directed force was applied to these teeth using 0.017 × 0.025-inch TMA cantilever springs. The premolars were extracted 8 weeks after the application of force. Images were obtained using micro-computed tomography. Resorption measurements were obtained using the Image J program. RESULTS: The mean values for resorption were 0.08869 mm3 for the root-filled teeth and 0.14077 mm3 for the contralateral teeth, indicating significantly less resorption for the root-filled teeth compared with the contralateral teeth after the application of orthodontic force (P = .003). In both groups, the most resorption was seen on the cervical-buccal and apical-lingual surfaces. The mean resorption value of the cervical region was 0.06305 mm3 in the control group and 0.0291 mm3 in the experimental group, and the difference was statistically significant (P = .002). CONCLUSIONS: Root-filled teeth showed significantly less orthodontic root resorption than vital teeth.


Assuntos
Reabsorção da Raiz , Microtomografia por Raio-X , Dente Pré-Molar , Humanos , Reabsorção da Raiz/diagnóstico por imagem , Extração Dentária , Técnicas de Movimentação Dentária , Raiz Dentária
14.
Dental Press J Orthod ; 25(6): 49-58, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33503125

RESUMO

INTRODUCTION: Invasive cervical resorption (ICR) is a relatively rare type of ERR (External Root Resorption), in which a localized resorption begins in the cervical area of the tooth, below the epithelial junction and above the ridge crest. OBJECTIVE: Describe the clinical case of an 11-year-old boy with no dental trauma history, presenting moderate crowding and ectopic eruption of the maxillary right central incisor. He had been undergoing orthodontic treatment elsewhere, and his family was dissatisfied with the results. DESCRIPTION: A new treatment was indicated, which included rapid maxillary expansion followed by extraction of four premolars. During routine panoramic evaluation, a radiolucid image was detected and a periapical radiograph was requested. At this point, an ICR of the maxillary right central incisor was found. The treatment was cautiously finalized and despite the use of light forces, central incisor was severally compromised by ICR and was therefore extracted. CONCLUSION: This clinical example discusses the importance of routine radiographs for the early diagnoses of ICR.


Assuntos
Incisivo , Reabsorção da Raiz , Dente Pré-Molar , Criança , Dente Canino , Humanos , Incisivo/diagnóstico por imagem , Masculino , Maxila/diagnóstico por imagem , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/etiologia
16.
Int Orthod ; 17(4): 733-743, 2019 12.
Artigo em Inglês | MEDLINE | ID: mdl-31495755

RESUMO

AIM: The use of mini implants to create a passive intraoral anchorage point has been mainly tested in clinical trials. In this study, an experimental integrated approach evaluated mini implant loading protocols (immediate vs. delayed loading) on bone remodelling and mini implant stability and the consequent degree of dental intrusion and apical root resorption. METHODS: A total of 40 Absoanchor® mini implants with 1.2mm diameter and 8mm length were placed in a total of 5 minipigs, 8 per animal, 2 in each hemiarch. Each implant was attached through a lingual button to the vestibular side of the second and fourth premolars with a nitinol coil spring of 150g force. The analysis of morphological aspects included the degree of dental movement, mini implant stability, and new bone formation over the mini implant heads. Bone mini-implant interface and modifications of dental root in response to intrusion were studied by light and electron microscopy. RESULTS: The rate of mini implant success was>98%, mainly in those subjected to immediate loading. This loading protocol promoted a high degree of osseointegration along with a high degree of intrusive dental movement, particularly of the second premolars. However, the radiological and histological studies showed a low degree of root resorption. Associated with the high intrusive movement, the penetration of the root apexes produced an inner cortical surface deformation of the maxillary sinus floor by remodeling and bone growth. CONCLUSION: In minipigs immediate loading of smooth mini implants promoted a high degree of intrusive movement particularly of the second premolars, stimulated bone growth and osseointegration, but extensive root resorption was not observed.


Assuntos
Implantes Dentários , Dente Molar/patologia , Procedimentos de Ancoragem Ortodôntica , Osseointegração/fisiologia , Reabsorção da Raiz/patologia , Animais , Dente Pré-Molar , Remodelação Óssea , Implantes Dentários/efeitos adversos , Mandíbula/diagnóstico por imagem , Mandíbula/patologia , Modelos Animais , Procedimentos de Ancoragem Ortodôntica/efeitos adversos , Osteogênese , Reabsorção da Raiz/diagnóstico por imagem , Levantamento do Assoalho do Seio Maxilar , Suínos , Porco Miniatura , Técnicas de Movimentação Dentária
17.
Am J Orthod Dentofacial Orthop ; 155(5): 650-655.e2, 2019 May.
Artigo em Inglês | MEDLINE | ID: mdl-31053280

RESUMO

INTRODUCTION: The goal of this study was to compare the outcomes and amount of change in periodontal health of anterior teeth in young versus middle-aged adults, who were treated to improve anterior alignment and occlusion. METHODS: Pre- and posttreatment records including orthodontic casts, cephalograms, and standardized periapical radiographs were retrospectively collected from young adults (aged 19-30 years; n = 12) and middle-aged adults (aged ≥40 years; n = 27). Following the American Board of Orthodontics criteria, discrepancy index (DI), cast-radiograph evaluation (CRE), treatment duration (TD), marginal bone loss (MBL), and tooth length (TL) were measured, and with the use of periapical radiographs, changes in the level of marginal bone (MBC) and the amount of root resorption (RR) after orthodontic treatment were calculated. RESULTS: DI, MBL, and TD were significantly higher in the middle-aged adults than in the young adults (P < 0.05). However, CRE and MBC after treatment were similar between the 2 groups (P > 0.05). The mean amount of RR following treatment was -0.6 ± 0.44 mm and -1.0 ± 0.61 mm in young and middle-aged adults, respectively. The degree of RR after compensating for treatment complexity and TD was similar between the 2 groups (P > 0.05). CONCLUSIONS: Although the initial malocclusion and periodontal conditions were unfavorable for the middle-aged adults, the overall treatment and periodontal outcomes after orthodontic treatment of the anterior teeth were similar to those for young adults. It appears that older adults tolerate orthodontics to improve the appearance of the anterior teeth as well as younger adults, with no additional burden because of their increased age.


Assuntos
Perda do Osso Alveolar/diagnóstico por imagem , Ortodontia Corretiva , Reabsorção da Raiz/diagnóstico por imagem , Adulto , Fatores Etários , Cefalometria , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Resultado do Tratamento
18.
J R Soc Interface ; 16(154): 20190108, 2019 05 31.
Artigo em Inglês | MEDLINE | ID: mdl-31039696

RESUMO

Orthodontic root resorption is a common side effect of orthodontic therapy. It has been shown that high hydrostatic pressure in the periodontal ligament (PDL) generated by orthodontic forces will trigger recruitment of odontoclasts, leaving resorption craters on root surfaces. The patterns of resorption craters are the traces of odontoclast activity. This study aimed to investigate resorptive patterns by: (i) quantifying spatial root resorption under two different levels of in vivo orthodontic loadings using microCT imaging techniques and (ii) correlating the spatial distribution pattern of resorption craters with the induced mechanobiological stimulus field in PDL through nonlinear finite-element analysis (FEA) in silico. Results indicated that the heavy force led to a larger total resorption volume than the light force, mainly by presenting greater individual crater volumes ( p < 0.001) than increasing crater numbers, suggesting that increased mechano-stimulus predominantly boosted cellular resorption activity rather than recruiting more odontoclasts. Furthermore, buccal-cervical and lingual-apical regions in both groups were found to have significantly larger resorption volumes than other regions ( p < 0.005). These clinical observations are complemented by the FEA results, suggesting that root resorption was more likely to occur when the volume average compressive hydrostatic pressure exceeded the capillary blood pressure (4.7 kPa).


Assuntos
Força Compressiva , Modelos Biológicos , Ligamento Periodontal , Reabsorção da Raiz , Microtomografia por Raio-X , Análise de Elementos Finitos , Humanos , Ligamento Periodontal/diagnóstico por imagem , Ligamento Periodontal/fisiopatologia , Pressão , Reabsorção da Raiz/diagnóstico por imagem , Reabsorção da Raiz/fisiopatologia
19.
J Endod ; 45(6): 761-767, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31003736

RESUMO

OBJECTIVE: The aim of this study was to compare the sensitivity and specificity of 3 different systems of cone-beam computed tomography (CBCT) in the detection of natural external root resorption (ERR) cavities using microtomography as the gold standard. METHOD: A sample of 126 ex vivo teeth were submitted to a microtomography examination to verify the presence/absence of ERR cavities. Then, they were divided into the control group: 85 teeth that did not present with an ERR cavity; and experimental group: 41 teeth that presented with 1 or more ERR cavities. The size of the natural ERR cavities varied from 2.46 mm3 to 3.11 mm3, which corresponded to cavities of 1.67 mm and 1.81 mm in diameter, respectively. The teeth were placed on a dry human mandible for scanning in each of the 3 protocols with different voxel sizes: 0.25 mm, 0.20 mm, and 0.166 mm. RESULTS: The accuracy of the 3 protocols evaluated in this study are listed in decreasing order: 60.3% for a voxel size of 0.20 mm, 56.7% for a voxel size of 0.166 mm, and 46.7% for a voxel size of 0.25 mm; these are smaller values than previous studies have obtained using artificial ERR cavities. Statistically significant results were not found among the 3 CBCT protocols that were used (P > .05), and the receiver operating characteristic curve shows the small differences found between the protocols. CONCLUSION: The results indicate that CBCT presents, for natural ERR, lower sensitivity and specificity values than those detected in previous studies of artificial cavities. The results demonstrate that natural ERR is neither easily observed nor accurately located by CBCT, as previous studies using artificial ERR indicated.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Reabsorção da Raiz , Tomografia Computadorizada de Feixe Cônico Espiral , Humanos , Reabsorção da Raiz/diagnóstico por imagem , Sensibilidade e Especificidade , Ápice Dentário , Raiz Dentária
20.
Niger J Clin Pract ; 22(4): 527-533, 2019 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-30975958

RESUMO

Objective: The objective of this study is to determine the incidence of impacted teeth and the frequency of pathologies they caused by cone beam computed tomography (CBCT) retrospectively. Materials and Methods: In this study, 608 patients' CBCT images were analyzed retrospectively. Detected impacted teeth were classified as incisor, canine, premolar, molar, third molar, and supernumerary teeth. The pathologies caused by impacted teeth are classified as cysts or tumors, tooth decay, root resorptions, and periodontal bone loss. Results: Impacted teeth were detected in 34.37% of the 608 CBCT images included in the study. The distribution of impacted teeth was 9.4% incisor, 29.4% canine, 9.9% premolar, 2.9% molar, 9.3% supernumerary, and 39.9% third molar teeth. Approximately 63.7% of the impacted teeth caused a pathology. The pathology that was most commonly caused by impacted teeth was periodontal bone loss (44.4%), and respectively others were root resorptions (33.3%), cysts or tumors (8.6%), and tooth decay (2.3%). The most common cause of this pathology was right mandibular third molar teeth. Conclusion: Impacted teeth were common and they often caused a pathology. CBCT is a useful device to assess the impacted teeth. When the impacted teeth are evaluated, each tooth should be assessed within itself. If the impacted teeth are not caused by pathology, they can be kept under control.


Assuntos
Perda do Osso Alveolar/patologia , Tomografia Computadorizada de Feixe Cônico/métodos , Cárie Dentária/patologia , Maxila/diagnóstico por imagem , Reabsorção da Raiz/diagnóstico por imagem , Dente Impactado/diagnóstico por imagem , Adolescente , Adulto , Perda do Osso Alveolar/epidemiologia , Perda do Osso Alveolar/etiologia , Dente Pré-Molar/diagnóstico por imagem , Feminino , Humanos , Incidência , Incisivo/diagnóstico por imagem , Masculino , Dente Molar/diagnóstico por imagem , Dente Serotino/diagnóstico por imagem , Estudos Retrospectivos , Reabsorção da Raiz/epidemiologia , Dente Impactado/complicações , Dente Impactado/epidemiologia , Dente Supranumerário/diagnóstico por imagem
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