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1.
J Contemp Dent Pract ; 21(2): 133-139, 2020 Feb 01.
Artículo en Inglés | MEDLINE | ID: mdl-32381816

RESUMEN

AIM: The aim of the current study was to correlate the clinical symptoms that are associated with temporomandibular disorder (TMD) to the osseous changes occurring in the affected temporomandibular joint (TMJ), as detected by cone-beam computed tomography (CBCT). MATERIALS AND METHODS: The clinical data of patients that presented with TMJ symptoms was collected and correlated with the CBCT findings for the same patients. Patient recruitment took place over a 1-year period in the Oral and Maxillofacial Surgery and Oral and Maxillofacial Radiology department of the same academic institution. RESULTS: There was a limited mouth opening (MO) (<3 cm). More importantly, there was a statistically significant positive relation between pain and loss of cortication. CONCLUSION: There was no significant correlation between CBCT findings consistent with TMJ degeneration and clinical symptoms. CLINICAL SIGNIFICANCE: Cone-beam computed tomography evaluation of the TMJ is important for providing information about the state and level of TMJ degeneration if any. However, clinical findings should be the most important factor when considering management options for symptomatic TMJ.


Asunto(s)
Cirugía Bucal , Trastornos de la Articulación Temporomandibular , Tomografía Computarizada de Haz Cónico , Humanos , Cóndilo Mandibular , Articulación Temporomandibular
2.
Rev. cient. odontol ; 8(1): e004-e004, ene.-abr. 2020. tab.
Artículo en Español | LILACS, LIPECS | ID: biblio-1095493

RESUMEN

Objetivo: Determinar la asociación entre el índice canino mandibular y el sexo, mediante la evaluación de volúmenes de pacientes que acudieron al CDI en el periodo 2014-2017. Metodología: Se evaluaron 500 volúmenes por tomografía computarizada de haz cónico (TCHC) de 184 hombres y 316 mujeres, con edades entre 12 y 50 años, por medio del software RealScan 2.0. Para hallar los datos, se usó la herramienta de medida y se procedió a determinar el diámetro mesiodistal del canino inferior derecho e izquierdo, así como la distancia intercanina inferior en cada volumen. Luego, se determinó el dimorfismo sexual de caninos, y se halló que el izquierdo presentaba el mayor valor (5,667%). Con este dato, se obtuvo el índice canino mandibular (ICM) por cada volumen. Seguidamente, se determinó el índice canino mandibular estándar (ICMs) ­ punto de corte­ y se obtuvo un valor de 0,264 y, a partir de él, se realizó la comparación entre el valor real del sexo de cada volumen con el obtenido a partir del punto de corte. Resultados: La eficacia del índice canino mandibular en hombres fue del 55.43% y en mujeres, del 54,75% (kappa = 0,095). Conclusión: El índice canino mandibular no debe ser considerado como un método determinante para la estimación del sexo. (AU)


Objective: To determine the association between the mandibular canine index (MCI) and sex by evaluating cone-beam computed tomographies (TCHC) of patients attending a radiographic center during 2014 to 2017. Methodology: 500 TCHCs of 184 men and 316 women ages 12-50 years were assessed using RealScan 2.0 software. The distal mesio diameter of the right and left lower canines was determined, as well as the lower intercanine distance in each TCHC. Then, the presence of sexual dimorphism was determined according to the canine teeth, with the left canine presenting the highest value (5.67%), and with these data, the MCI was obtained for each TCHC. Subsequently, the standard MCI cut-off point was determined, obtaining a value of 0.264 and the real value of the sex of each TCHC was compared with the cut-off point. Results: The efficacy of the MCI was 55.43% in men and 54.75% in women (kappa = 0.095). Conclusion: The MCI is not a good determinant for estimating sex. (AU)


Asunto(s)
Humanos , Masculino , Femenino , Adolescente , Adulto , Persona de Mediana Edad , Sexo , Análisis para Determinación del Sexo , Caracteres Sexuales , Diente Canino , Tomografía Computarizada de Haz Cónico , Epidemiología Descriptiva , Estudios Transversales , Estudios Retrospectivos , Estudios Observacionales como Asunto
3.
Artículo en Inglés | MEDLINE | ID: mdl-32233198

RESUMEN

A technology called Trace Registration (TR) has been introduced to allow dynamic navigation of implant placement without the need for a thermoplastic stent. This study was undertaken in order to validate the accuracy of the TR protocol for dynamically guided implant surgery. A retrospective, observational, in vivo study was performed using dynamic navigation via the TR protocol. The preoperative cone beam computed tomography (CBCT) plan was superimposed and registered (aligned) with the postoperative CBCT scan to assess accuracy parameters. A total of 136 implants were placed in 59 partially edentulous arches. Mean deviation between the planned and actual position for all implants was 0.67 mm at the coronal level (entry point), 0.9 mm at the apical level, and 0.55 mm in depth, with an angle discrepancy of 2.50 degrees. Tracing 5 to 6 teeth tended to improve accuracy results compared to tracing 3 to 4 teeth. TR is as accurate as traditional registration and statically guided methods for implant surgery.


Asunto(s)
Implantes Dentales , Boca Edéntula , Cirugía Asistida por Computador , Diseño Asistido por Computadora , Tomografía Computarizada de Haz Cónico , Implantación Dental Endoósea , Humanos , Imagenología Tridimensional , Estudios Retrospectivos
4.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(4): 280-284, 2020 Apr 09.
Artículo en Chino | MEDLINE | ID: mdl-32268631

RESUMEN

With the wide application of digital technology in the field of stomatology, the acquisition of three-dimensional tooth and dentition information through three-dimensional (3D) image data and optical scan data has become an indispensable process in clinical diagnosis and analysis. Cone-beam CT images and optical scanning images have their own characteristics in terms of data acquisition range and the accuracy of data. Single data source is not accurate enough or complete in the delivery of tooth and dental information. At present, two data sources are used to construct a 3D crown root model with high-precision crown and complete root information to meet the requirement of clinical orthodontic functional setup and implant surgical guide design. The integration of tooth crown and root is one of the focused topics of clinical research. This review will summarize the research progress of 3D crown root model construction method, introduce the application of various algorithms, and analyze the characteristics of these approaches, in order to provide reference for clinical application and scientific research.


Asunto(s)
Imagenología Tridimensional , Corona del Diente , Diente , Tomografía Computarizada de Haz Cónico , Humanos , Corona del Diente/diagnóstico por imagen , Raíz del Diente
5.
J Oral Sci ; 62(2): 180-183, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32224571

RESUMEN

This study aimed to evaluate the prevalence of internal symmetry (the number and morphology of root canals) in the mandibular incisors using cone beam computed tomography (CBCT). A total of 302 CBCT scans involving 1,208 mandibular incisors were evaluated using the Vertucci's classification regarding the number and configuration of root canals. The central mandibular incisors exhibited two root canals in 22.6% of patients and lateral incisors in 24.3% of patients. Most teeth (76.4%) had a type I configuration (a single root canal, 1-1), 21.7% had type II (2-1), 1.1% had type V (1-2), and 0.8% had type IV (2-2). Teeth with a type-III configuration (1-2-1) were not found. In total, 17.5% of patients had a symmetric appearance of the two-canalled central mandibular incisors and 20.5% had a bilateral appearance of the two-canal lateral incisors. Moreover, in 12.3% of the patients, all four incisors showed two root canals. The highest degree of symmetry was found in incisors that had one root canal (central incisors: 217 of 302, lateral incisors: 229 of 302), followed by type 2-1 incisors (central incisors 50, lateral incisors 58). The influence of sex and age on the prevalence of symmetries was not significant. Concluding, the internal anatomy of the mandibular incisors cannot not be sufficiently predicted from the root canal anatomy of the contralateral tooth. Thorough clinical and radiographic inspection of each tooth remains mandatory to address the internal anatomy of the mandibular incisors correctly.


Asunto(s)
Cavidad Pulpar , Incisivo , Tomografía Computarizada de Haz Cónico , Humanos , Mandíbula , Raíz del Diente
6.
J Oral Sci ; 62(2): 242-244, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32224576

RESUMEN

When the sinus is enlarged, it may be necessary to elevate the floor of the maxillary sinus using the crestal or lateral approach. This report presents a case where sinus floor elevation was performed using tricalcium phosphate (TCP) plates supported by implant bodies, and only the blood clot was present around the implant bodies. Cone-beam computed tomography images, taken one year after the lateral approach, revealed the presence of a TCP-like radio-opacity, which almost disappeared after two years. About seven years after the surgery, the patient's superstructure and occlusion were stable. Furthermore, the grafted TCP was completely absorbed, and the implant body appeared to be in good condition, with no signs of bone resorption around the implant.


Asunto(s)
Implantes Dentales , Elevación del Piso del Seno Maxilar , Fosfatos de Calcio , Tomografía Computarizada de Haz Cónico , Humanos , Seno Maxilar
7.
Indian J Dent Res ; 31(1): 85-90, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32246688

RESUMEN

Aim: : The aim of this study is to validate the Fernanda Angelieri classification method for the individual assessment of mid-palatal suture among Indian children using multi-slice computed tomography (CT) with respect to clinical application in rapid maxillary expansion. Material and Methods: Present study was conducted utilizing 760 existing head and neck CT image records. CT images were stratified into three categories based on growth spurts: Group I - 6-10 years (n = 210), Group II - 11-14 years (n = 270), and Group III - 15-18 years (n = 280). The CT images were analyzed for stages of mid-palatal suture maturation, according to age and sex. The recorded data were subjected for statistical analysis. Results: Indian children, up to age of 10 years, were distributed in stage A and B. After 11 years, up to 14 years girls showed varied distribution and spread equally among stage B, C, and D. After 15 years, more number of girls were distributed in stage D and E, whereas boys remained distributed variedly in stage B, C, and D. Mid- palatal suture maturational stages correlated to chronological age among both the genders using Fisher exact test and expected contingency table showed statistically significant variation among both the gender independently and collectively (P < 0.001). Conclusion: Cone beam computed tomography (CBCT)-based prediction of stages of mid- palatal suture maturation by Fernanda Angelieri is valid among the Indian population. During treatment plan of maxillary expansion among children above 10 years, it is better to have a diagnostic CBCT image analysis of mid-palate suture for predicable prognosis.


Asunto(s)
Paladar (Hueso) , Respeto , Niño , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Masculino , Maxilar , Técnica de Expansión Palatina , Suturas
8.
Indian J Dent Res ; 31(1): 91-102, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32246689

RESUMEN

Objectives: This study was aimed at determining the specific signs of close relationship between impacted mandibular third molar (IMTM) root and inferior alveolar nerve (IAN) canal as visualised on digital panoramic radiograph or orthopantomograph (OPG) which should indicate as well as contraindicate the need for cone beam computed tomography (CBCT) imaging based on hierarchical model of Fryback and Thornbury. Materials and Methods: The sample consisted of 120 individuals (200 IMTM) who had undergone OPG as well as CBCT imaging as preoperative radiographic evaluation before surgical extraction. On panoramic radiographs; Rood and Sheehab's radiographic signs of IMTM root and IAN canal, impacted third molar position based on Winter's classification and depth of impaction based on Pell and Gregory's classification were evaluated. On CBCT; presence/absence of corticalization and the status of the buccal and lingual cortices (thinning/perforation) were evaluated. These findings of OPG were compared to CBCT findings to determine the better modality based on hierarchical model of Fryback and Thornbury. Results: Statistically significant association was found between radiographic signs of Rood and Sheehab such as 'no relation' and 'superimposition' on OPG and presence of corticalization between IMTM root and IAN canal on CBCT. Statistically significant association was also found between 'mesioangular' and 'vertical' positions of Winter's classification as well as 'class 1A' of Pell and Gregory's classification of IMTM on OPG and presence of corticalization on CBCT. CBCT was found to be having lesser variance and greater F value as compared to OPG for evaluation of IMTM. Conclusions: On OPG; Rood and Sheehab's radiographic signs such as 'no relation' and 'superimposition', Winter's 'mesioangular' and 'vertical' and Pell and Gregory's 'Class 1A' are not indicative for CBCT examination before surgical extraction is attempted. On OPG; Rood and Sheehab's radiographic signs such as interruption of white line, darkening of root, darkening of canal, deflection of root, narrowing of canal as well as diversion of canal are all frequently associated with absence of corticalization between IMTM root and IAN canal and hence require CBCT examination before surgical extraction is attempted so that post-operative neurological complications can be minimised. Also, Winter's horizontal, distoangular and others as well Pell and Gregory's classes 1B,1C,2A,2B,2C,3A,3B,3C are indicative for CBCT examination before surgical extraction is attempted. Fryback and Thornbury model-based comparison proves that CBCT is a better radiographic modality as compared to OPG for evaluation of IMTM relation with IAN canal.


Asunto(s)
Tercer Molar , Diente Impactado , Tomografía Computarizada de Haz Cónico , Humanos , Mandíbula , Nervio Mandibular , Radiografía Panorámica , Extracción Dental
9.
Indian J Dent Res ; 31(1): 160-163, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32246702

RESUMEN

Endodontic treatment of fused teeth needs special care and attention due to its complex anatomy. The aim of this article is to highlight the problems encountered and the strategy in treating such cases. We report a case of unilateral fusion of the left mandibular central incisor and lateral incisor, with a single pulp chamber. The single pulp chamber separates into two root canals and a large communication exists at the apical third of the root canals. This is the first time fused teeth with a large communication is reported. CBCT analysis was effective in confirming the morphological aberrations and aided in accurate planning and treatment. Chemomechanical preparation with manual dynamic irrigation coupled with passive ultrasonic activation of the irrigant and obturation with thermoplasticised gutta percha helped in successful outcome of the case.


Asunto(s)
Dientes Fusionados , Tomografía Computarizada de Haz Cónico , Cavidad Pulpar , Estética Dental , Gutapercha , Humanos , Obturación del Conducto Radicular , Preparación del Conducto Radicular
10.
J Appl Oral Sci ; 28: e20190168, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32236352

RESUMEN

INTRODUCTION: Isthmuses are reported as common anatomic complexities in teeth often associated with failures in endodontic treatment. They should be considered before starting treatment and a preoperative computed tomography scan (CT) may demonstrate these complexities. OBJECTIVE: To assess the diagnostic value of the highest resolution settings of a cone-beam CT (CBCT) system in identifying and measuring apical isthmuses, using micro-CT as reference. METHODOLOGY: After micro-CT scanning, 40 humans' lower first molars with isthmuses in the apical-3 mm of mesial roots were scanned by the highest resolution settings of the New Generation i-Cat ® CBCT equipment. Two blinded observers recorded the detection of isthmuses in CBCT scans. The lengths of isthmuses were compared between micro-CT and CBCT to assess the diagnostic value of CBCT. Quantitative data for sensitivity were represented as percentages (95% confidence interval). The Bland-Altman method was used to assess differences between gold standard lengths (micro-CT) and CBCT lengths. RESULTS: BCT demonstrated 30 positive findings, representing sensitivity for isthmus identification of 75% (95% CI=0.4114-1.1364). Differences between the lengths in micro-CT (1.99±0.40 mm) and CBCT (1.53±0.41 mm) were significant (p<0.0001). CONCLUSION: The CBCT device used presented limited diagnostic value in the identification and measurement of apical isthmuses in the mesial roots of lower molars. In some cases, the actual anatomy of the apical root canal may not be completely delineated in this type of CBCT system, even using the highest resolution settings.


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Ápice del Diente/anatomía & histología , Ápice del Diente/diagnóstico por imagen , Raíz del Diente/anatomía & histología , Raíz del Diente/diagnóstico por imagen , Análisis de Varianza , Humanos , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Variaciones Dependientes del Observador , Tamaño de los Órganos , Valores de Referencia , Reproducibilidad de los Resultados , Tratamiento del Conducto Radicular/métodos , Sensibilidad y Especificidad
11.
Indian J Dent Res ; 31(1): 103-108, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32246690

RESUMEN

Background: The position of the mental foramen (MF) is particularly relevant in dentistry. The incorporation of new imaging techniques, such as cone-beam-computed tomography (CBCT), can be used to identify anatomic dimorphic traits. Aims: This study evaluated the sexual dimorphism of MF position by CBCT among a selected population. Methods: Fifty CBCT images from 20 to 40-year-old subjects (25 men and 25 women) were evaluated. The horizontal position was evaluated using the al Jasser-Nwoku classification to identify the position of the MF in the mandible. Two measurements were obtained on coronal sections to evaluate the vertical position of the MF: the distance from the uppermost alveolar ridge to the upper edge of the foramen and the distance from the inferior edge of the foramen to the lower border of the mandible. Statistical Analysis Used: Comparisons between sexes and sides were performed with Student's t-test and Chi-square tests. Results: The most frequent location of the MF was in line and below of the second premolar tooth in both men and women (P > 0.05). Additionally, significant differences were found between sexes for the distance from the inferior edge of the foramen to the lower border of the mandible in each side (P < 0.001 for the right and left sides). Conclusions: Horizontal position of the MF is not a sexually dimorphic feature and it is predominantly in line and below the second premolar tooth. Women present the MF in a more caudal position, closer to the mandibular base when compared to men.


Asunto(s)
Foramen Mental , Caracteres Sexuales , Adulto , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Masculino , Mandíbula , Perú , Adulto Joven
12.
J Clin Pediatr Dent ; 44(2): 112-115, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32271657

RESUMEN

The present case report describes a rare case of dens evaginatus on the labial surface of mandibular incisor and interdisciplinary management including endodontic and periodontal treatment. A 10-year-old girl presented unusual whitish tubercle-like structure penetrated through the buccal gingiva of mandibular later incisor. In cone-beam computed tomographic view, pulpal tissue was extended from the principal root to the tubercle. Following full thickness flap reflection, the tubercle was carefully removed, resulting in dentin and pin-point pulp exposure. In order to prevent pulp necrosis and facilitate periodontal attachment to this area, Biodentine and enamel matrix derivative were applied. Gingival defect was compensated using a collagen matrix. Up to 2 years, harmonious gingiva state and no loss of tooth vitality were observed. In summary, dens evaginatus on mandibular later incisor could be successfully treated by means of interdisciplinary approach.


Asunto(s)
Necrosis de la Pulpa Dental , Incisivo , Niño , Tomografía Computarizada de Haz Cónico , Esmalte Dental , Dentina , Femenino , Humanos
13.
Compend Contin Educ Dent ; 41(4): e1-e6, 2020 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-32250125

RESUMEN

OBJECTIVE: The authors' objective was to determine, by means of cone-beam computed tomography (CBCT), if there is a significant difference between the cephalometric and condylar measurements obtained in maximum intercuspation (MIP) and those obtained in centric relation (CR), which would interfere in orthodontic diagnosis and planning. METHODS: The sample consisted of 30 randomly selected patients (15 men and 15 women, mean age 14 years, CR ≠ MIP between 1 mm and 2 mm) who had undergone orthodontic treatment. This retrospective study used CBCT scans, one in MIP and the other in CR. Cephalometric measurements and sagittal, axial, and vertical condylar variations between the CR and MIP positions were analyzed in a tridimensional (3D) imaging software. RESULTS: Patients with a small CR-MIP discrepancy (<2 mm) presented significant differences in the cephalometric analysis carried out in CR and MIP, although these differences might be of low clinical significance. The condyle-fossa relationships in sagittal, coronal, and axial planes did not seem to be relevant, because only one measurement presented significant change between CR and MIP positions. CONCLUSIONS: Class II malocclusion in patients with a large CR-MIP discrepancy may be exacerbated in the CR position, which may in turn increase treatment difficulty. In these cases, not only must cephalometrics be registered in CR, but dental casts and photographs of the patient are needed to permit orthodontists to plan an appropriate treatment.


Asunto(s)
Oclusión Dental Céntrica , Maloclusión , Adolescente , Relación Céntrica , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Masculino , Cóndilo Mandibular , Estudios Retrospectivos
14.
Med Oral Patol Oral Cir Bucal ; 25(3): e395-e402, 2020 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-32271319

RESUMEN

BACKGROUND: Deciding whether or not to extract third molars remains a controversial situation in dental practice. Image exams support this decision by enabling a close view of the third molar, its adjacent bone and its relationship with the second molar. This study aimed to assess and compare second molar bone loss adjacent to impacted mandibular third molar in panoramic radiographs (PAN) and cone beam computed tomography (CBCT) scans. MATERIAL AND METHODS: A sample of 70 patients was selected (n=124 teeth). Each patient had a set of a panoramic radiograph and CBCT scans consecutively taken for dental treatment purposes. In PAN and CBCT, mandibular third molars were classified based on their position and bone loss of the adjacent second molar. Agreement between PAN and CBCT scans was assessed and quantified. RESULTS: Outcomes of bone loss assessment were different between PAN and CBCT scans (p<0.05). Bone loss was found in 62.9% of the PAN, while in CBCT scans it was found in 80%. In particular, nearly 29% (n=27) of the teeth that were classified without bone loss in PAN were classified with bone loss in CBCT scans. Mesioangular and horizontal third molars had a statistically significant association with bone loss of the adjacent second molars (p<0.05). In general, PAN underestimated the severity of bone loss compared to CBCT scans (p<0.05). CONCLUSIONS: Diagnosing second molar bone loss due to impaction of adjacent third molar in PAN may be challenging because of false negatives. Impacted third molars justify preoperative CBCT scans if second molar bone loss needs to be precisely assessed for a more detailed and reliable treatment plan.


Asunto(s)
Tercer Molar , Diente Impactado , Tomografía Computarizada de Haz Cónico , Humanos , Mandíbula , Diente Molar , Radiografía Panorámica
15.
J Dent Educ ; 84(3): 301-307, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-32176341

RESUMEN

Historically, predoctoral and advanced dental education programs used two-dimensional panoramic and periapical radiographs for implant planning. Three-dimensional (3D) Cone Beam Computed Tomography (CBCT) imaging has improved visualization of anatomic structures that can positively influence implant planning and surgical implant placement. The aim of this study was to assess how U.S. postdoctoral periodontics programs have incorporated CBCT technology into their curricula. A ten-question survey was sent to all 57 U.S. postdoctoral periodontics programs in November-December 2018. Thirty-seven responses were received, for a 65% response rate. All participating programs reported providing residents access to CBCT machines, and most of their residents received some training in the acquisition and interpretation of CBCT images. Nearly all (95%) participating programs provided training to apply implant planning software. Among the participating programs, 14% reported using a surgical guide fabricated with a CBCT scan 76-100% of the time, and 60% reported obtaining a CBCT scan for implant cases 76-100% of the time. These results suggest that, while residents are receiving training in CBCT and implant planning, it is not used often. There may be merit in adopting the American Academy of Oral and Maxillofacial Radiology's recommendation to use 3D imaging for all implant planning, with CBCT as the imaging modality of choice.


Asunto(s)
Implantes Dentales , Tomografía Computarizada de Haz Cónico Espiral , Tomografía Computarizada de Haz Cónico , Educación en Odontología , Humanos , Imagenología Tridimensional , Periodoncia , Encuestas y Cuestionarios
16.
Braz Oral Res ; 34: e016, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32130363

RESUMEN

Horizontal bone loss after tooth extraction is a common finding that demands bone reconstruction in various cases. The aim of this study was to assess the horizontal alveolar status in partially and completely edentulous patients using cone-beam computed tomography (CBCT). In total, 1516 CBCT scans of 1404 adult patients were analyzed. Assessment of the images was performed in accordance with the previously published horizontal alveolar change (HAC) classification, which categorizes horizontal bone defects into four classes: HAC 1, HAC 2, HAC 3 and HAC 4 (from the least severe to the most severe condition). Analysis of 1048 scans from partially edentulous patients presented a distribution of 63.55%, 22.14%, 13.36% and 0.95% in HAC 1, HAC 2, HAC 3 and HAC 4, respectively. Analysis of 468 scans from completely edentulous patient images presented a distribution of 19.87%, 28.63%, 41.67% and 9.83% in HAC 1, HAC 2, HAC 3 and HAC 4, respectively. Based on these results, as in HAC 4, no cancellous bone was found between the cortical buccal and lingual/palatal bone plates, it seems reasonable to state that the absence of cancellous bone is higher in completely edentulous patients than in partially edentulous patients. Therefore, the absence of cancellous bone seems to be higher in completely edentulous than in partially edentulous patients.


Asunto(s)
Pérdida de Hueso Alveolar/epidemiología , Pérdida de Hueso Alveolar/patología , Proceso Alveolar/patología , Boca Edéntula/epidemiología , Boca Edéntula/patología , Adolescente , Adulto , Anciano , Pérdida de Hueso Alveolar/diagnóstico por imagen , Proceso Alveolar/diagnóstico por imagen , Aumento de la Cresta Alveolar , Brasil/epidemiología , Hueso Esponjoso/diagnóstico por imagen , Hueso Esponjoso/patología , Tomografía Computarizada de Haz Cónico/métodos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Boca Edéntula/diagnóstico por imagen , Prevalencia , Estudios Retrospectivos , Adulto Joven
17.
Prog Orthod ; 21(1): 8, 2020 Mar 16.
Artículo en Inglés | MEDLINE | ID: mdl-32173764

RESUMEN

BACKGROUND: Correcting posterior crossbite in adult patients using nonsurgical methods may involve buccolingual tooth movement. Knowing the extent of the pretreatment alveolar bony dehiscences and fenestrations in the posterior area will aid orthodontists in planning posterior crossbite patients accordingly to minimize posttreatment bony defects. Before the advent of cone beam computed tomography (CBCT), observing buccal and lingual bony defects was not possible unless other treatment needs allowed for an open-flap procedure. With CBCT technology, we can now detect posterior defects with some accuracy. The aim of the present study was to determine the prevalence of posterior alveolar bony dehiscence and fenestration in adults with posterior crossbite compared with noncrossbite adults. METHODS: The study group consisted of pretreatment CBCTs of 28 samples with at least one or more teeth in posterior crossbite or edgebite. The comparison group consisted of pretreatment CBCTs of 28 samples with no posterior crossbite or edgebite. All buccal and lingual sides of the upper and lower posterior segments were measured for the presence of dehiscence, fenestration, and combined total bony defects. RESULTS: The prevalence of total bony defects was higher in the study group (61.6%) than in the comparison group (52.1%) (p < 0.05). While there was no difference in prevalence between crossbite teeth in the study group and noncrossbite teeth in the comparison group, the noncrossbite teeth in the study group showed a higher prevalence of total bony defects, dehiscence, and fenestration than the noncrossbite teeth in the comparison group (p < 0.05). The prevalence of dehiscence was higher in the study group (41.2%) than in the comparison group (33.3%) (p < 0.05). Neither the prevalence of fenestration nor the mean bony defect size showed statistical significance between the two groups. First premolars showed a higher prevalence of dehiscence than other posterior teeth, and maxillary posterior teeth had a higher prevalence of fenestration than mandibular posterior teeth. Among the maxillary posterior teeth, second premolars had the least amount of fenestration. CONCLUSIONS: Adult subjects with posterior crossbite had a higher prevalence of total bony defects and dehiscence, especially buccal dehiscence, in the posterior region than subjects with no posterior crossbite. This was due to the high prevalence observed in the noncrossbite teeth in posterior crossbite subjects.


Asunto(s)
Maloclusión , Tomografía Computarizada de Haz Cónico Espiral , Adulto , Proceso Alveolar , Tomografía Computarizada de Haz Cónico , Humanos , Prevalencia
18.
Minerva Stomatol ; 69(1): 27-36, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-32181606

RESUMEN

BACKGROUND: Root trunk length (RTL) plays an important role in the diagnosis, prognosis and treatment of periodontitis. The aim of this retrospective pilot study was to evaluate the RTL of first maxillary premolar and to study the correlation with age and sex in this value. METHODS: The sample included 110 cone beam computed tomography (CBCT) images comprising 220 maxillaries first premolars from systemically healthy patients aged between 18 and 70 years. The tooth length (TL), root length (RL) and RTL were measured (dependent variables). Age and sex were considered as independent variables. RESULTS: No statistically significant correlation was found between the RTL and the TL. Longer RL and longer RTL were observed in younger patients than older subjects only in the left maxillary premolars. On the other hand, the sex of the patients had no effect on either of the dependent variables. The single rooted maxillary premolars were more frequent (relative to those with two roots) in woman and in elderly patients. CONCLUSIONS: A correlation between the age and the RTL and RL has been found but only in left premolars. Sex seemed to have only a slight correlation on the frequency of single-rooted teeth of the right side of the mouth. Further studies should be addressed to clarify the significance of the asymmetries observed in the present study between the two sides of the mouth with the aim of deepening the knowledge and understanding of the different variables that could be correlated with the RTL.


Asunto(s)
Cavidad Pulpar , Maxilar , Adolescente , Adulto , Anciano , Diente Premolar , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Persona de Mediana Edad , Proyectos Piloto , Estudios Retrospectivos , Raíz del Diente , Adulto Joven
19.
Dent Clin North Am ; 64(2): 365-378, 2020 04.
Artículo en Inglés | MEDLINE | ID: mdl-32111275

RESUMEN

The use of 3-dimensional (3D) cone-beam computed tomography (CBCT) imaging in the dental office has become a common imaging modality. The authors present an overview of multiple treatments that would benefit from the use of this technology. From preoperative, intraoperative, to postoperative patient management, 3D technology plays a vital role in the dental practice. With the incorporation of 3D CBCT, intraoral scanners, and 3D printing, a dental provider can accurately plan and execute the treatment with greater confidence. The contemporary dentist, however, has many options for incorporating the digital workflow based on the specific practice needs.


Asunto(s)
Consultorios Odontológicos , Imagenología Tridimensional , Tomografía Computarizada de Haz Cónico , Humanos , Impresión Tridimensional
20.
Am J Orthod Dentofacial Orthop ; 157(3): 329-339, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-32115111

RESUMEN

INTRODUCTION: The purpose of this study was to comparatively evaluate the effects of Twin-block (TB) appliance and sagittal-guidance Twin-block (SGTB) appliance on alveolar bone around mandibular incisors in growing patients with Class II Division 1 malocclusion, using cone-beam computed tomography. METHODS: The sample consisted of 25 growing patients with Class II Division 1 malocclusion (14 boys and 11 girls, mean age 11.92 ± 1.62 years) and was randomly distributed into the TB group (n = 13) and the SGTB group (n = 12). The treatment duration was 11.56 ± 1.73 months. Pretreatment (T1) and posttreatment (T2) cone-beam computed tomography scans were taken in both groups. Height, thickness at apex level, and volume of the alveolar bone around mandibular left central incisors were measured respectively on labial and lingual side, using Mimics software (version 19.0; Materialise, Leuven, Belgium). Based on the stable structures, 3-dimensional (3D) registrations of T1 and T2 models were taken to measure the sagittal displacement of incisors. Intragroup comparisons were evaluated by paired-samples t tests and Wilcoxon tests. Independent-samples t tests and Mann-Whitney U tests were used for intergroup comparisons. RESULTS: In both groups, alveolar bone height and volume on the labial side of the incisors significantly decreased after treatment (P <0.05). Lingual alveolar bone height, lingual and total alveolar bone volume, labial, lingual and total alveolar bone thickness showed no significant difference between T1 and T2 (P >0.05). In both groups the incisors tipped labially and drifted to the labial side. Compared with the TB group, less labial alveolar bone loss, less incisor proclination and crown edge drift were found in the SGTB group (P <0.05). CONCLUSIONS: Labial alveolar bone loss around mandibular incisors was observed after both types of appliances treatment in growing patients with Class II Division 1 malocclusion. Less labial alveolar bone loss, less incisor proclination, and crown edge drift were found in the SGTB group than in the TB group during treatment.


Asunto(s)
Pérdida de Hueso Alveolar , Maloclusión de Angle Clase II , Aparatos Ortodóncicos , Adolescente , Cefalometría , Niño , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Incisivo , Masculino , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula , Corona del Diente
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