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1.
Braz Oral Res ; 35: e022, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33605353

RESUMEN

This study aimed to determine the mean distances between apexes of the maxillary posterior teeth and the maxillary sinus, between apexes of the mandibular posterior teeth and the mandibular canal, and between the root apexes of all teeth and the adjacent cortical plates. A total of 800 cone-beam computed tomography (CBCT) scans (400 maxillary and 400 mandibular) were obtained from patients indicated for several treatments. The proximity between apexes and anatomical structures, and the relationship between apexes and adjacent cortical plates were assessed together with the risk of over-instrumentation. Paired-sample comparisons were performed by using the paired t-test. The means were compared by ANOVA, Kruskal-Wallis and Dwass-Steel-Critchlow-Fligner tests. a) Most of the apexes classified as A (high-risk proximity) were observed in maxillary first and second molars, in mandibular first and second molars, and in second premolars in relation to near anatomical structures. b) A predominance of class A (86.42%) was noticed in the first premolars, between apexes of maxillary teeth and adjacent cortical plates. c) The distance between apexes of mandibular teeth and buccal cortical plates showed a predominance of medium-risk proximity (B) in all the groups, except the first premolars, with the highest risk (82.22%), and the second molars, with low-risk proximity (C) to distal and mesiobuccal apexes (91.77% and 89.62%). CBCT images are important for endodontic diagnosis and treatment, since many teeth have high risk proximity to near anatomical structures and adjacent cortical plates.


Asunto(s)
Seno Maxilar , Raíz del Diente , Corteza Cerebral , Tomografía Computarizada de Haz Cónico , Humanos , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
3.
Angle Orthod ; 90(4): 524-531, 2020 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378490

RESUMEN

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.


Asunto(s)
Resorción Radicular , Animales , Masculino , Osteoclastos , Ratas , Ratas Wistar , Resorción Radicular/diagnóstico por imagen , Resorción Radicular/etiología , Técnicas de Movimiento Dental/efectos adversos , Raíz del Diente/diagnóstico por imagen , Microtomografía por Rayos X
4.
Angle Orthod ; 90(6): 811-822, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378522

RESUMEN

OBJECTIVES: To determine the different impact of moment-to-force ratio (M:F) variation for each tooth and spatial plane and to develop a mathematical model to predict the orthodontic movement for every tooth. MATERIALS AND METHODS: Two full sets of teeth were obtained combining cone-beam computed tomography (CBCT) and optical scans for two patients. Subsequently, a finite element analysis was performed for 510 different force systems for each tooth to evaluate the centers of rotation. RESULTS: The center of CROT locations were analyzed, showing that the M:F effect was related to the spatial plane on which the moment was applied, to the force direction, and to the tooth morphology. The tooth dimensions on each plane were mathematically used to derive their influence on the tooth movement. CONCLUSION: This study established the basis for an orthodontist to determine how the teeth move and their axes of resistance, depending on their morphology alone. The movement is controlled by a parameter (k), which depends on tooth dimensions and force system features. The k for a tooth can be calculated using a CBCT and a specific set of covariates.


Asunto(s)
Técnicas de Movimiento Dental , Diente , Tomografía Computarizada de Haz Cónico , Análisis de Elementos Finitos , Humanos , Fenómenos Mecánicos , Diente/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
5.
Am J Orthod Dentofacial Orthop ; 158(5): e99-e109, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-33131571

RESUMEN

INTRODUCTION: This research aimed to compare the estimation error of the root axis using 3-dimensional (3D) tooth models at the midtreatment stage between the whole-surface scan (WSS) and lingual-surface scan (LSS) methods. METHODS: The sample consisted of 208 teeth (26 each of central incisors, canines, second premolars, and first molars in the maxillary and mandibular dentition) from 13 patients whose pre- and midtreatment intraoral scan and cone-beam computed tomography (CBCT) were available. The 3D tooth models were constructed by merging the intraoral-scan crowns and the CBCT-scan roots obtained at the pretreatment stage. To estimate the root axis at the midtreatment stage, we superimposed the individual 3D tooth models onto the midtreatment intraoral scan obtained by the WSS and LSS methods. The midtreatment CBCT scan was used as the gold standard to determine the real root axis. The estimated root axis in terms of mesiodistal angulation and buccolingual inclination was measured in the WSS and LSS methods, and statistical analysis was performed. RESULTS: The estimation errors of the mesiodistal angulation and buccolingual inclination were <2.0° in both methods. The LSS method demonstrated a statistically larger but clinically insignificant estimation error than the WSS method in the mandibular canine (mesiodistal angulation, 1.95° vs 1.62°) and the total tested teeth (mesiodistal angulation, 1.40° vs 1.29°; buccolingual inclination, 1.51° vs 1.41°). CONCLUSIONS: Because the estimation errors of the root axis angle using the 3D tooth model by the WSS and LSS methods were within the clinically acceptable range, the root axis can be estimated by both methods.


Asunto(s)
Modelos Dentales , Raíz del Diente , Tomografía Computarizada de Haz Cónico , Humanos , Maxilar/diagnóstico por imagen , Corona del Diente/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
6.
Braz Dent J ; 31(5): 516-522, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-33146336

RESUMEN

The purpose of this study was to evaluate the accuracy of Cone-Beam Computed Tomography (CBCT) in measuring radicular dentin thickness focused on intraradicular post placement planning treatment. Ten single-rooted human premolars were selected. The teeth were divided into three segments (cervical, middle and apical). The coronal face of the apical and middle sections was selected for the dentin thickness assessment; which was measured from the external root surface to the root canal wall, on the buccal, lingual, mesial, and distal surfaces of each tooth. In situ anatomical measurement was the reference standard, and the corresponding axial CBCT imaging were evaluated by the i-CAT software. The one-way ANOVA test and the Bonferroni post hoc test were applied to compare the groups (p>0.05). CBCT imaging measurements (p=0.003) overestimated the radicular dentin thickness compared to the reference standard. Descriptive analysis showed that the greatest difference between the reference standard and the tomographic measurement means were 0.20 mm. One-way ANOVA test found the statistical significant difference among group's measurements. Bonferroni correction demonstrated statistically significant difference only related lingual surface for the CBCT imaging measurements. CBCT imaging measurements overestimated the radicular dentin thickness. However, the measurement difference was clinically acceptable.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Raíz del Diente , Diente Premolar/diagnóstico por imagen , Cavidad Pulpar , Dentina/diagnóstico por imagen , Humanos , Tratamiento del Conducto Radicular , Raíz del Diente/diagnóstico por imagen
7.
Indian J Dent Res ; 31(4): 656-661, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-33107474

RESUMEN

Palatoradicular grooves are usually found on the palatal or lateral roots of maxillary central and lateral incisors. Since clinical identification of these grooves are inaccessible and arduous in routine oral hygiene practices and are susceptible alcoves for microorganism habituation and plaque accumulation, it may result in acute to severe periodontitis and, if untreated, periapical pathosis also. This paper discusses about a female patient who reported pus discharge in left upper lateral incisor. Based on history, clinical examination and IOPA (intra-oral periapical radiograph), a deep pocket of about 10-14 mm was noticed in the left upper lateral incisor. A timely investigation was made and was treated surgically with advanced modified procedures which include odontoplasty and restoration of the defect with Platelet Rich Fibrin. After follow up of 6 months, the patient reported no signs of disease progression, had good oral hygiene and the tooth remained to be vital.


Asunto(s)
Placa Dental , Raíz del Diente , Femenino , Humanos , Incisivo , Maxilar , Paladar (Hueso) , Raíz del Diente/diagnóstico por imagen
8.
Am J Orthod Dentofacial Orthop ; 158(6): 783-798.e20, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33077369

RESUMEN

INTRODUCTION: Safe zone maps are useful for the clinician to plan miniscrew insertion and possibly reduce radiation exposure. This study aimed to investigate the available evidence regarding the presence of sufficient interradicular space and adequate cortical bone thickness in patients with a complete permanent dentition, in the vestibular and palatal or lingual interradicular sites, mesial to the second molar. METHODS: PubMed, Scopus, Web of Science, Cochrane Library, and OpenGrey databases were searched up to January 2019 for observational studies involving patients with fully erupted second molars that investigated the amount of interradicular space and/or the cortical thickness of the alveolar processes using 3-dimensional data sets. A custom tool was prepared and used to assess the risk of bias in individual studies. A meta-analysis was performed when at least 4 different studies evaluated 1 identical parameter homogeneously. Publication bias was assessed with the Egger linear regression test. RESULTS: Twenty-seven observational articles were included in the qualitative synthesis. Only 11 articles were at low risk of bias. Fifteen articles were included in the meta-analysis. The results were graphically reported in "safe-zone" maps. CONCLUSIONS: In the maxilla, the most suitable insertion sites are those from mesial to the first molar to distal to the first premolar, and between the canine and the lateral incisor, all at 6 mm from the cementoenamel junction. In those areas, the cortical bone has adequate thickness, not requiring predrilling. In the mandible, the preferable vestibular interradicular spaces are those between first and second molars and between first and second premolars, both at 5 mm from the cementoenamel junction, and predrilling is suggested in these areas. TRIAL REGISTRATION NUMBER: PROSPERO CRD42016042081.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Raíz del Diente , Hueso Cortical/diagnóstico por imagen , Humanos , Mandíbula/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
9.
Stomatologiia (Mosk) ; 99(5): 32-37, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-33034174

RESUMEN

THE AIM OF THE STUDY: Was to identify the features of the anatomical structure of the root canals of teeth according to CBCT data in patients in different age groups. MATERIAL AND METHODS: Patients of europeoid race, both sexes, who have indications for endodontic treatment (60 people), were divided into three groups: group 1 (young) 20 people aged 18 to 44 years, group 2 (middle age) 20 people - from 45 to 60 years, group 3 (elderly) 20 people - from 61 to 75 years old. To assess the root canal anatomy, all patients underwent x-ray examination (CT) on a Vatech computed tomography and analyzed with the Ez3D plus program before beginning endodontic treatment. The object of study was the first molars of the lower jaw (distal root canal). RESULTS: The analysis of axial, sagittal, coronal sections of the first molar of the lower jaw revealed that patients belonging to the 1st group, the distal root canal often had an oval shape all over (95%) and over a wide apical opening, in only one case out of 20 (5%) were identified at slit-like form of the distal root canal, probably due to malocclusion or as a consequence of increased abrasion of teeth. In group 2, two independent root canals were identified in the distal root of the first lower molar (in 65%), extending from the tooth cavity to the apex.in 35% of cases, the distal root canal began with a single entrance in the oral part and bifurcated into two separate channels at about the level of 2 /3 canals, then re - joined into a single apical opening, in group 3, in 75% of cases, a slit-like form of the distal root canal was observed. The obtained CLCT data (taking into account the image error) were confirmed in the clinic at the stage of endodontic treatment using optical magnification (microscope). CONCLUSION: CBCT and operation microscopy with x40 magnification data showed clear age-dependent variations of first lower molar distal root canal anatomy.


Asunto(s)
Cavidad Pulpar , Mandíbula , Adolescente , Adulto , Anciano , Cavidad Pulpar/diagnóstico por imagen , Femenino , Humanos , Masculino , Persona de Mediana Edad , Diente Molar/diagnóstico por imagen , Tratamiento del Conducto Radicular , Raíz del Diente/diagnóstico por imagen , Adulto Joven
10.
Int J Nanomedicine ; 15: 6761-6777, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32982232

RESUMEN

Purpose: Guided bone regeneration (GBR) therapy, which is a widely used technique in clinical practice and is effective in improving the repair of alveolar bone defects or bone mass deficiency regeneration, requires the use of membrane materials with good biocompatibility, barrier function, rigidity matching the space maintenance ability, economic benefits and excellent clinical applicability. The aim of this study was to develop an electrospun attapulgite (ATT)-doped poly (lactic-co-glycolic acid) (PLGA) scaffold (PLGA/ATT scaffold) as a novel material for GBR applications. Methods and Results: Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to determine the morphology and the crystalline structure of the PLGA/ATT scaffolds, respectively. Porosity and contact-angle measurements were also carried out to further characterize the physical properties of the PLGA/ATT scaffolds. The results of in vitro studies showed that bone marrow mesenchymal stem cells (BMSCs) attached more readily to and spread better over the PLGA/ATT scaffolds than the Bio-Gide membrane. Furthermore, in the in vitro osteoinductive experiments with BMSCs, the PLGA/ATT scaffolds were found to enhance the activity of alkaline phosphatase (ALP), promote the formation of mineralized bone nodules, and up-regulate the expression of several osteogenic markers-namely, runt-related transcription factor 2, alkaline phosphatase, osteopontin, and osteocalcin-which are similar to the effects of the Bio-Gide membrane. Further, in in vivo studies, the results of sequential fluorescent labeling, micro-computed tomography, and histological analysis suggest that using the PLGA/ATT scaffolds for repairing V-shaped buccal dehiscence on a dog's tooth root improved bone regeneration, which is not only similar to the result obtained using the Bio-Gide membrane but also much better than that obtained using PLGA scaffolds and the negative control. Conclusion: To achieve satisfactory therapeutic results and to lower the cost of GBR treatment, this study provided a promising alternative material of bio-degradable membrane in clinical treatment.


Asunto(s)
Pérdida de Hueso Alveolar/terapia , Regeneración Ósea/fisiología , Compuestos de Magnesio/farmacología , Compuestos de Silicona/farmacología , Andamios del Tejido/química , Animales , Regeneración Ósea/efectos de los fármacos , Calcificación Fisiológica , Colágeno , Perros , Expresión Génica , Encía/citología , Humanos , Compuestos de Magnesio/química , Masculino , Células Madre Mesenquimatosas/citología , Células Madre Mesenquimatosas/fisiología , Osteogénesis/efectos de los fármacos , Osteogénesis/genética , Osteogénesis/fisiología , Copolímero de Ácido Poliláctico-Ácido Poliglicólico/química , Porosidad , Ratas Sprague-Dawley , Compuestos de Silicona/química , Raíz del Diente/diagnóstico por imagen , Microtomografía por Rayos X
11.
PLoS One ; 15(9): e0239759, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32970759

RESUMEN

OBJECTIVE: The purpose of this study was to evaluate the effects of miniscrew insertion angle and vertical facial type on the interradicular miniscrew-root distance available for molar distalization. MATERIALS AND METHODS: Cone-beam computed tomography images of 60 adults with skeletal Class I occlusion exhibiting hyperdivergent (n = 20), normodivergent (n = 20), and hypodivergent (n = 20) facial types were used. Placement of a 6-mm long, 1.5-mm diameter, tapered miniscrew was simulated at a site 4 mm apical to the cementoenamel junction, with insertion angles of 0°, 30°, 45°, and 60° relative to the transverse occlusal plane. The shortest linear distance between the miniscrew and anterior root at four interradicular sites was measured: maxillary second premolar and first molar (Mx 5-6), maxillary first and second molars (Mx 6-7), mandibular second premolar and first molar (Mn 5-6), and mandibular first and second molars (Mn 6-7). RESULTS: Miniscrew-root distance significantly increased as the insertion angle increased from 0° to 60°. In the mandible, the distances significantly differed among vertical facial types, increasing in the following order: hyperdivergent, normodivergent, and hypodivergent. The minimum mean distance was found in the Mx 6-7 (30°; 0.86±0.35 mm), and the maximum mean distance was found in the Mn 5-6 (60°; 2.64±0.56 mm). The rates of miniscrews located buccally outside the root distalization path were up to 70% and 55% when the miniscrews were placed at 60° insertion angles in the Mx 5-6 and Mn 5-6 regions, respectively. CONCLUSIONS: Miniscrew-root distance increased significantly with the increased insertion angle, and the amount of increase was affected by the miniscrew placement site and vertical facial type. To ensure adequate distalization of the posterior segment, the miniscrew should be inserted at an angle in the interradicular area between the second premolar and first molar.


Asunto(s)
Tornillos Óseos , Simulación por Computador , Tomografía Computarizada de Haz Cónico/métodos , Diente Molar/diagnóstico por imagen , Métodos de Anclaje en Ortodoncia/métodos , Técnicas de Movimiento Dental/métodos , Raíz del Diente/diagnóstico por imagen , Adulto , Femenino , Humanos , Masculino , Métodos de Anclaje en Ortodoncia/instrumentación , Técnicas de Movimiento Dental/instrumentación
12.
Quintessence Int ; 51(10): 798-807, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32954388

RESUMEN

OBJECTIVES: The purpose of this study was to assess the prevalence of C-shaped canals in permanent mandibular second molars (SMs) and to determine whether its appearance was associated with the presence of distolingual root (DLR) in permanent mandibular first molars (FMs). METHOD AND MATERIALS: Three hundred and eighty patients were qualified for evaluation of their FMs and SMs using cone beam computed tomography. The prevalence, distribution pattern, external root morphology, and the internal root canal anatomy of the examined molars were recorded and analyzed. Furthermore, the association between the root canal configurations of SMs and the appearance of DLR in FMs was also assessed. RESULTS: The prevalence of SMs with C-shaped root canals was 44.7%. The most common root canal configuration type of the one-rooted SMs with C-shaped anatomy was C3 (45.6%), followed by C2 and C1. The frequency of C-shaped canals in SMs was 45.4% in Non-DLR group, 52.8% in unilateral DLR group, and 33.9% in bilateral DLR group, respectively. Moreover, the prevalence of C-shaped root canals in SMs with the presence of bilateral DLRs in FMs was significantly lowered. CONCLUSION: The association between the presence of DLR in FMs and C-shaped canal configurations in neighboring SMs was surveyed, and the prevalence of C-shaped root canals in SMs with the presence of bilateral DLRs in FMs was found to be significantly lowered.


Asunto(s)
Tomografía Computarizada de Haz Cónico Espiral , Tomografía Computarizada de Haz Cónico , Cavidad Pulpar/diagnóstico por imagen , Humanos , Mandíbula/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
13.
Artículo en Inglés | MEDLINE | ID: mdl-32546427

RESUMEN

OBJECTIVE: The aim of this study was to examine the relationship between molar root positions and antral pseudocysts (APs). STUDY DESIGN: The retrospective study included 160 patients. Vertical relationships of the molar roots and the maxillary sinus floor were divided into 4 categories. Root relationships were compared for the presence and dimensions of APs overlying teeth. The root relationships and the presence of APs were also compared for differences in gender, right versus left side, and age groups. RESULTS: APs were significantly more likely to occur in areas where 1 root extended through the sinus floor from the first molar (P = .004) or second molar (P = .014) and where more than 1 root of the first molar extended through the floor (P = .002). The extension of roots into the sinus was associated with a 9.900 to 25.300 times increase in APs compared with areas with no root contact. The height and width of APs were significantly greater in areas of root penetration into the sinus but gender, side, and age had no effect on the distribution of these root relationships. CONCLUSIONS: Root apices that transmit occlusal force to the Schneiderian membrane might induce the formation of APs and increase the dimensions of the lesions.


Asunto(s)
Seno Maxilar , Elevación del Piso del Seno Maxilar , Tomografía Computarizada de Haz Cónico , Humanos , Maxilar , Seno Maxilar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Estudios Retrospectivos , Raíz del Diente/diagnóstico por imagen
14.
Arch Oral Biol ; 117: 104792, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32559509

RESUMEN

OBJECTIVES: The aim of the present study was to evaluate the influence of bifid and non-bifid configurations of the mesial root of mandibular first molars in the canal anatomy using micro-computed tomography (micro-CT). DESIGN: Thirty mesial roots with bifid apex were pair-matched with 30 non-bifid roots by means of micro-CT. Bifid and non-bifid mesial roots were compared regarding morphological aspects at the apical third, dentin thickness, and the presence of isthmus and middle mesial canal (MMC). Data were analyzed using Chi-square test and Student's t-test with a significant level of 5 %. RESULTS: Main foramen of mesiobuccal (MB) and mesiolingual (ML) canals were positioned within 2.5 mm from the anatomic apex, and origin and exit of accessory canals were observed mostly between 1.0 and 2.0 mm from the apex in the groups. Despite no statistical difference was observed between bifid and non-bifid roots regarding the number of canal orifices (p > 0.05), the frequency of accessory canals was significantly higher in bifid roots (p < 0.05). Regarding the dentin thickness, a statistically significant difference was observed between bifid and non-bifid roots at the furcation level (p < 0.05). Only 3 mesial roots with bifid apex (10 %) had isthmuses, mostly at the coronal third, while a high incidence of MMC was observed in this group (n = 10, 33.3 %). CONCLUSIONS: Presence of bifid apex in the mesial root of mandibular first molars might be a predictive factor for a complex canal anatomy at the apical third with an increasing number of accessory canals.


Asunto(s)
Diente Molar , Raíz del Diente/diagnóstico por imagen , Cavidad Pulpar/diagnóstico por imagen , Humanos , Mandíbula/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Ápice del Diente/diagnóstico por imagen , Microtomografía por Rayos X
15.
Medicine (Baltimore) ; 99(20): e20116, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-32443322

RESUMEN

The aim of this study was to explore the root morphology and root canal configuration of first premolars among Shandong Chinese residents using cone-beam computed tomography (CBCT).Randomly selected CBCT images were collected from 648 patients (44% women, 56% men). In total, 1268 maxillary and 1296 mandibular first premolars were analyzed. The number of roots and the canal configuration were recorded and identified based on Vertucci's classification.The majority of the maxillary first premolars had 1 root (67.4%), followed by 2 roots (32%). A 2-canal configuration (89%) was the most prevalent observation. For mandibular first premolars, 98.8% had 1 root and 81% presented the type I configuration. There were no statistical differences in the number of roots or morphology in terms of the left/right side or sex (P > .05).Among Chinese residents, the majority of maxillary first premolars had 1 root and 2 canals, whereas the most common anatomical configuration for mandibular first premolars was 1 root with 1 canal.


Asunto(s)
Diente Premolar/diagnóstico por imagen , Tomografía Computarizada de Haz Cónico , Raíz del Diente/diagnóstico por imagen , Adolescente , Adulto , Anciano , Variación Anatómica , Grupo de Ascendencia Continental Asiática , Femenino , Humanos , Masculino , Mandíbula , Maxilar , Persona de Mediana Edad , Adulto Joven
16.
Arch Oral Biol ; 116: 104749, 2020 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-32445973

RESUMEN

OBJECTIVE: The purpose of this systematic review was to assess the influence of population demographic characteristics on the prevalence of a second canal in mandibular anterior teeth. DESIGN: Four electronic databases and five peer-reviewed journals were searched from May 2018 to September 2019 for prevalence studies using cone-beam computed tomographic imaging on second canal morphology in mandibular anterior teeth. The identified studies were subjected to a hand search of bibliographic references followed by contact with the authors. Full text analysis and critical appraisal (JBI) was undertaken on 40 papers by 2 evaluators. Sixteen studies were included into a meta-analysis. Forest plots with proportion and odds ratios with a 95% confidence interval were calculated. Meta-regression was performed in order to identify possible sources of heterogeneity. RESULTS: The 16 selected studies presented an average JBI score of 77.7% and revealed data from 40,784 mandibular anterior teeth (14,278 central incisors, 14,433 lateral incisors, and 12,073 canines). The overall prevalence of a second canal for central incisors, lateral incisors and canines was 20.4% (15.0%-25.7% CI 95%), 25.3% (20.0%-30.7% CI 95%) and 5.9% (4.1%-7.7% CI 95%), respectively. Males showed significantly higher odds of having a second canal for both incisors (p < 0.05). East Asia studies presented lower proportions of a second canal in mandibular anterior teeth (p < 0.05). CONCLUSIONS: The overall prevalence of a second canal in the mandibular central and lateral incisors and canines was 20.4%, 25.3% and 5.9%, respectively. Meta-analysis calculation revealed gender and patient geographic origin as possible confounding factors of the proportion outcomes.


Asunto(s)
Cavidad Pulpar , Tratamiento del Conducto Radicular , Raíz del Diente , Tomografía Computarizada de Haz Cónico , Estudios Transversales , Cavidad Pulpar/diagnóstico por imagen , Lejano Oriente , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Prevalencia , Raíz del Diente/diagnóstico por imagen
17.
BMC Oral Health ; 20(1): 135, 2020 05 08.
Artículo en Inglés | MEDLINE | ID: mdl-32384929

RESUMEN

BACKGROUND: While there is ample research into the anatomy of mandibular molars, little is known regarding isthmuses and middle mesial (MM) canals in Chinese populations. The goal of this study was to determine the prevalence of MM canals and isthmuses in the mesial root of mandibular first molars using Cone-beam Computed Tomography. METHODS: Cone-beam Computed Tomography images of 357 mature mandibular first molars were retrospectively analyzed. Presence of isthmuses and MM canals, and the length of isthmuses in the mesial root were recorded. Meanwhile, we also recorded possible correlated factors such as demographics, side of mandible, presence of separated distal-lingual roots. RESULTS: Of these 357 teeth, 209 showed evidence of either complete or partial communication in the mesial root. Of these, 11(3.1%) exhibited true MM canals while 198(55.5%) exhibited isthmuses. Sex or side of mandible was not correlated with the prevalence of isthmuses (P > 0.05). However, there was a significant association between the presence of a distal-lingual root and the prevalence of such communication (P < 0.001). The average length of isthmuses was 4.3 ± 3.1 mm. CONCLUSIONS: We detected high rate of isthmuses and low rate of MM canals in mesial roots of mandibular first molars, which is important as such areas should be identified and cleaned during root canal treatment.


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Cavidad Pulpar/diagnóstico por imagen , Mandíbula/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen , Adolescente , Adulto , Anciano , Grupo de Ascendencia Continental Asiática , China , Estudios Transversales , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Adulto Joven
18.
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
19.
BMC Oral Health ; 20(1): 43, 2020 02 06.
Artículo en Inglés | MEDLINE | ID: mdl-32028960

RESUMEN

BACKGROUND: Better understanding of the danger zone anatomy in mesial roots (MRs) of mandibular first molars (MFMs) may serve to decrease the risk of mishaps. This study aimed to measure the minimal distal dentine thicknesses of danger zone in MRs of MFMs in a native Chinese population using cone-beam computed tomography (CBCT). METHODS: CBCT images of 1792 MFMs from 898 Chinese patients were analyzed. The minimal distal dentine thicknesses of the mesiobuccal (MB) and mesiolingual (ML) canals below the furcation 1, 2, 3, 4, 5 mm were measured. The association between the minimal distal dentine thicknesses and the root lengths, patient's age and gender, side were assessed. RESULTS: The minimal distal dentine thicknesses of MB and ML canals are located 3 ∼ 4 mm below the furcation for both men and women. There are no differences between MB and ML canals, while the minimal distal dentine thicknesses of MB and ML canals were higher in men than women (P < 0.05), except at 1 and 3 mm of ML canals (P > 0.05). The minimal distal dentine thicknesses of MB and ML canals increased with age in both men and women at each location (P < 0.05). The minimum distal dentine thickness at every location were significantly different between long teeth and short teeth both in men and women (P < 0.05), with short teeth having the smallest mean values. There are no significant differences between two sides (P > 0.05). CONCLUSIONS: The minimal distal dentine thicknesses of MRs in MSMs have close correlation with root length, patient's age and gender.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Dentina/anatomía & histología , Mandíbula/diagnóstico por imagen , Diente Molar/anatomía & histología , Raíz del Diente/anatomía & histología , Adolescente , Adulto , China , Tomografía Computarizada de Haz Cónico , Cavidad Pulpar/diagnóstico por imagen , Femenino , Humanos , Masculino , Persona de Mediana Edad , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen
20.
Am J Orthod Dentofacial Orthop ; 157(2): 212-217, 2020 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-32005473

RESUMEN

INTRODUCTION: This study aimed to investigate the association between root morphology of maxillary incisors and nonsyndromic tooth agenesis in patients compared with a control group without agenesis. METHODS: This controlled cross-sectional pilot study (1:4) was performed with a random sample of 335 records from Brazilian applicants for orthodontic treatment, paired by sex and age. Panoramic and periapical radiographs were analyzed to diagnose tooth agenesis and to assess root morphology. The agenesis group (n = 67) included patients with nonsyndromic tooth agenesis, and the control group (n = 268) included patients without tooth agenesis. The statistical analysis included the Student t test and z test, conditional logistic regression, and odds ratio estimates. RESULTS: Occurrence of root morphological changes was significantly higher among patients with agenesis (P <0.05). Significant morphological changes (short, blunt, apically bent, and pipette-shaped roots) were found in the roots of remaining teeth when comparing agenesis and control groups (P <0.05). Patients with agenesis were more likely to show root morphological changes (odds ratio, 74.23; 95% confidence interval, 16.93-325.46; P <0.001). CONCLUSION: Patients with agenesis are more likely to present root morphological changes, which should be considered to minimize problems during orthodontic treatments.


Asunto(s)
Anodoncia , Incisivo , Raíz del Diente , Anodoncia/diagnóstico por imagen , Brasil , Estudios Transversales , Humanos , Incisivo/diagnóstico por imagen , Maxilar , Proyectos Piloto , Radiografía Panorámica , Raíz del Diente/diagnóstico por imagen
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