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1.
Gen Dent ; 68(1): 66-71, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-31859666

RESUMEN

Knowledge of the anatomical relationships between the maxillary sinus (MS) and posterior teeth is important to prevent complications when endodontic or oral surgical procedures are performed. The aim of this study was to evaluate the relationships between the root apices of maxillary posterior teeth and the MS floor. Three oral radiologists evaluated 851 posterior teeth (1969 roots) imaged with cone beam computed tomography. The roots were analyzed individually in parasagittal sections, on which the most superior point of the apex was observed. A qualitative evaluation was performed, and each root was assigned a proximity score: 1, root invaginating the MS; 2, root in close contact with the MS floor; 3, root with no relationship with the MS; and 4, root with a measurable proximity to the MS. For roots classified as score 4, the distance to the MS floor was measured (quantitative analysis). Student t tests, 1-way analysis of variance, and simple linear regression analysis were performed (P < 0.05). The qualitative analysis revealed that the mesiobuccal root of the second molar had a pronounced proximity to the MS. The quantitative analysis revealed no differences in distance to the MS between right and left posterior teeth or between the different roots of the same tooth. In relation to the MS, the second molar was positioned closest, followed by the first molar, second premolar, and first premolar. Except for the comparison between mean distances of the second premolar and first molar (P = 0.11), the differences between groups of teeth were statistically significant (P < 0.05). Simple linear regression analysis showed that the more posterior the tooth was in relation to the midline, the shorter the mean distance from the root apex to the MS floor (P < 0.05). The mesiobuccal roots of second molars were closest to the MS. Second molars exhibited the shortest distances between their root apices and the MS and the greatest number of roots that were invaginating or in close contact with the MS. Therefore, second molars require special attention when endodontic or oral surgical approaches involve those regions.


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Maxilar , Seno Maxilar , Humanos , Procesamiento de Imagen Asistida por Computador , Maxilar/anatomía & histología , Seno Maxilar/anatomía & histología , Seno Maxilar/diagnóstico por imagen , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Raíz del Diente/anatomía & histología , Raíz del Diente/diagnóstico por imagen
2.
Am J Orthod Dentofacial Orthop ; 156(4): 493-501, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31582121

RESUMEN

INTRODUCTION: The purpose of this research was to evaluate dental compensation in facial asymmetry and its correlation with skeletal variables using cone-beam computed tomography. METHODS: Sixty adult patients were retrospectively divided into asymmetry (mean age, 21.8 ± 5.4 years) and symmetry groups (mean age, 28.1 ± 4.1 years); both groups comprised 30 patients. Independent and paired t tests were used for comparisons between the asymmetry and symmetry groups and between deviated (Dv) and nondeviated (NDv) sides of the asymmetry group, respectively. Pearson correlation between dental and skeletal variables was performed. RESULTS: The mean value of menton deviation was 9.4 mm in the asymmetry group. Compared with the symmetry group, the direction and amount of dental compensation of the asymmetry group were as follows: 2.5-mm extrusion of the maxillary first molar (UM6) at NDv (P <0.05); 1.8-mm higher position of the mandibular canine (LC) from the mandibular horizontal plane using mental foramen (MHP_mf) at NDv (P <0.05); 6°-more buccoversion of UM6 at Dv; 3.7°-more linguoversion of UM6 at NDv; 4.8°-more buccoversion of the maxillary canine (UC) at Dv; 4.9°-more buccoversion of the mandibular molar (LM6) at NDv; and 2.6°-more linguoversion of LC at Dv. Dental compensation correlated or marginally correlated with skeletal variables of the deviated mandible. CONCLUSIONS: Dental compensations, extrusion of the maxillary molars on the NDv, and buccal tipping of the maxillary teeth and lingual tipping of the mandibular teeth on the Dv, were observed. The mandibular body length was associated with linguoversion of the mandibular molars on the Dv. The ramal inclination was related to the extrusion of the maxillary molars on the NDv.


Asunto(s)
Cefalometría/métodos , Tomografía Computarizada de Haz Cónico/métodos , Asimetría Facial/diagnóstico por imagen , Maloclusión/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Adolescente , Adulto , Estética Dental , Asimetría Facial/fisiopatología , Femenino , Humanos , Imagen Tridimensional/métodos , Masculino , Maloclusión/fisiopatología , Persona de Mediana Edad , Diente Molar/fisiopatología , Estudios Retrospectivos
3.
Medicine (Baltimore) ; 98(40): e17356, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31577730

RESUMEN

Molar-incisor malformation (MIM) is a recently defined dental abnormality of molar root and incisors, and introduced as one of the causes of periapical and periodontal abscess. The purpose of this study was to investigate the clinical and radiological features of MIM, with special emphasis on various medical history. A total of 38 patients with MIM were included in this study. Radiographic features and clinical data, including medical history, chief complaint, associated complications, treatment, and prognosis, were retrospectively investigated. On radiographs, the affected molars showed short, slender, underdeveloped roots and constricted pulp chambers. All affected incisors and canines exhibited dilacerated short roots, wedge-shaped defect on the cervical part of the crown. Complications included periodontal bone loss (52.6%), endodontic lesion (50.0%), and endodontic-periodontal lesion (28.9%). The medical histories of the patients with MIM indicate that almost all (94.7%) were hospitalized due to problems during the neonatal period. MIM may cause various dental problems, such as periapical and periodontal abscess and early loss of the affected teeth. The early diagnosis of MIM on radiographs and appropriate treatment will contribute to a favorable prognosis, especially for young and adolescent patients.


Asunto(s)
Incisivo/diagnóstico por imagen , Incisivo/patología , Diente Molar/diagnóstico por imagen , Diente Molar/patología , Anomalías Dentarias/diagnóstico por imagen , Anomalías Dentarias/patología , Adolescente , Pérdida de Hueso Alveolar/etiología , Niño , Preescolar , Cavidad Pulpar/diagnóstico por imagen , Cavidad Pulpar/patología , Femenino , Humanos , Masculino , Radiografía Dental , Estudios Retrospectivos , Anomalías Dentarias/complicaciones , Anomalías Dentarias/diagnóstico , Raíz del Diente/diagnóstico por imagen , Raíz del Diente/patología , Adulto Joven
4.
J Endod ; 45(12): 1472-1478, 2019 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-31648800

RESUMEN

INTRODUCTION: Apical surgery is frequently indicated in maxillary first molars. Occasionally, a vascular anastomosis in the lateral maxillary sinus wall can be observed during surgery. The aim of this study was to examine the distance between the vascular bone channel (VBC) and the root apices of maxillary first molars using cone-beam computed tomographic imaging. METHODS: Cone-beam computed tomographic images of 104 maxillary first molars were oriented in the coronal plane to evaluate the distance between the roots and the VBC. The measurements were only recorded in relation to the buccal roots. In addition, demographic parameters and further measurements such as the diameter of the VBC and the proximity to the periapical pathology were evaluated. RESULTS: A total of 210 VBCs were assessed. The mean distance from the VBC to the apices of the buccal roots of the maxillary first molars was 6.18 mm ± 3.84 mm. The VBC was mostly located intrasinusally (74.3%) and only rarely superficially (0.5%). The diameter of the VBC was on average 0.88 ± 0.32 mm. CONCLUSIONS: In this study, the VBC was usually found closer to the mesiobuccal than to the distobuccal root apex. During preparation of the access window, the existence of the VBC should be kept in mind because the mesiobuccal roots of maxillary first molars undergo apical surgery to the buccally positioned roots only.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Diente Molar , Senos Transversos , Humanos , Maxilar , Seno Maxilar , Diente Molar/diagnóstico por imagen , Raíz del Diente , Senos Transversos/diagnóstico por imagen
5.
Am J Orthod Dentofacial Orthop ; 156(3): 365-374, 2019 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-31474266

RESUMEN

INTRODUCTION: We sought the 3-dimensional (3D) zone of the center of resistance (ZCR) of mandibular posterior teeth groups (group 1: first molar; group 2: both molars; group 3: both molars and second premolar; group 4: both molars and both premolars) with the use of 3D finite element analysis. METHODS: 3D finite element models comprised the mandibular posterior teeth, periodontal ligament, and alveolar bone. In the symmetric bilateral model, a 100-g midline force was applied on a median sagittal plane at 0.1-mm intervals to determine the anteroposterior and vertical positions of the ZCR (where the applied force induced translation). The most reliable buccolingual position of the ZCR was then determined in the unilateral model. The combination of the anteroposterior, vertical, and buccolingual positions was defined as the ZCR. RESULTS: The ZCRs of groups 1-4 were, respectively, 0.48, 0.46, 0.50, and 0.53 of the mandibular first molar root length from the alveolar crest level and located slightly distobuccally at anteroposterior ratios of 2:3.0, 2:2.3, 2:2.4, and 2:2.5 to each sectional arch length and at buccolingual ratios of 2:1.5, 2:1.1, 2:1.6, and 2:2.4 to the first molar's buccolingual width. CONCLUSIONS: The ZCR can be a useful reference for 3D movement planning of mandibular posterior teeth or segments.


Asunto(s)
Imagen Tridimensional/métodos , Mandíbula/anatomía & histología , Mandíbula/diagnóstico por imagen , Diente/anatomía & histología , Diente/diagnóstico por imagen , Proceso Alveolar/anatomía & histología , Proceso Alveolar/diagnóstico por imagen , Diente Premolar/anatomía & histología , Diente Premolar/diagnóstico por imagen , Arco Dental , Modelos Dentales , Análisis de Elementos Finitos , Humanos , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Ortodoncia Correctiva , Ligamento Periodontal/anatomía & histología , Ligamento Periodontal/diagnóstico por imagen , Técnicas de Movimiento Dental
6.
Microsc Res Tech ; 82(11): 1884-1890, 2019 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-31400189

RESUMEN

Determining surface topography of different tissues of the molar tooth with novel analytical methods has opened new horizons in dental surface measurements which characterize tooth surface quality in dentistry. Studying surface topological measurements and comparing surface morphology of hard tissue of the molar tooth are the ultimate goals of the present study. Ten molar teeth have been chosen for investigating their surface characteristics through image processing techniques. The power spectral density (PSD) and fast Fourier transform algorithms of every molar tooth containing enamel, dentin, and cementum have determined that the characterization of surface profiles is possible. As can be seen, PSD along with fractal dimensions leads to good results for teeth surface topography. Moreover, PSD angular plot assures appropriate description of surface.


Asunto(s)
Cemento Dental/ultraestructura , Esmalte Dental/ultraestructura , Dentina/ultraestructura , Fractales , Diente Molar/ultraestructura , Adulto , Cristalografía por Rayos X , Análisis de Fourier , Dureza/fisiología , Humanos , Masculino , Microscopía de Fuerza Atómica , Diente Molar/diagnóstico por imagen , Propiedades de Superficie
7.
Am J Orthod Dentofacial Orthop ; 156(2): 178-185, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31375227

RESUMEN

INTRODUCTION: This study aimed to identify significant factors affecting the spontaneous angular changes of impacted mandibular third molars as a result of second molar protraction. Temporary skeletal anchorage devices in the missing mandibular first molar (ML-6) or missing deciduous mandibular second molar (ML-E) with missing succedaneous premolar spaces provided traction. METHODS: Forty-one mandibular third molars of 34 patients (10 male and 24 female; mean age 18.3 ± 3.7 years) that erupted after second molar protraction were included in this study. They were classified into upright (U) and tilted (T) groups. Linear and angular measurements were performed at the time of treatment initiation (T1) and of ML-6 or ML-E space closure (T2). Regression analyses were used to identify significant factors related to third molar uprighting. RESULTS: Nolla stage (odds ratio [OR] 4.1), sex (OR 0.003 for male), third molar angulation at T1 (OR 1.1), missing tooth space (OR 0.006), rate of third molar eruption (OR 23.3), and rate of second molar protraction (OR 0.2) significantly affected third molar uprighting. Age, third molar angulation at T1, rate of third molar eruption, and rate of second molar protraction were significant factors for predicting third molar angulation at T2. CONCLUSIONS: Available space for third molar eruption before and after second molar protraction is not associated with uprighting of erupting third molars. Older patients whose third molars are in greater Nolla stage, are in a more upright position at T1, and have a greater eruption rate have a greater chance for third molar uprighting. Alternatively, an increase in second molar protraction rate results in mesial tipping of the third molars.


Asunto(s)
Maloclusión/prevención & control , Maloclusión/fisiopatología , Mandíbula/fisiopatología , Tercer Molar/fisiopatología , Diente Impactado/fisiopatología , Adolescente , Adulto , Puntos Anatómicos de Referencia , Diente Premolar , Femenino , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Mandíbula/anatomía & histología , Mandíbula/diagnóstico por imagen , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Diente Molar/fisiopatología , Tercer Molar/anatomía & histología , Tercer Molar/diagnóstico por imagen , Aparatos Ortodóncicos , Cierre del Espacio Ortodóncico , Ortodoncia Correctiva , Erupción Dental , Diente Primario , Diente Impactado/complicaciones , Diente Impactado/diagnóstico por imagen , Adulto Joven
8.
Niger J Clin Pract ; 22(8): 1091-1098, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31417052

RESUMEN

Aims: Our aim was to compare three different voxel sizes of CBCT images for the determination of residual filling material volume in root canals when compared with micro CT. Material and Methods: Forty-two root canals of 14 extracted human maxillary molar teeth were retreated by using ProFile® instruments. Images were obtained after retreatment by using ProMax 3D Max CBCT at 3 different voxel sizes (1) High resolution (0.1 mm); (2) High definition (0.15 mm); and (3) Normal resolution (0.2 mm). Two observers measured volumes of residual filling materials in exported CBCT images by means of 3D Doctor Software. Micro CT measurements were served as gold standard. Mann-Whitney U test and Wilcoxon Test were used for the comparison of CBCT and micro CT measurements. Statistical significance was set at P < 0.05. Results: No statistically differences were found between the two observers for all measurements (P > 0.05). There were no significant differences among different CBCT voxel sizes used (0.1 mm, 0.15 mm, and 0.2 mm) (P > 0.05). The Spearman correlation coefficients between CBCT at different voxel sizes significantly highly correlated with micro CT measurements for each observer (P < 0.05). Furthermore, no significant differences were found between the measurements obtained by the two observers in consideration to root canal location (P > 0.05). Conclusion: CBCT images may provide useful information in the volumetric assessment of the amount of residual filling material in root canals for retreatment procedures.


Asunto(s)
Cavidad Pulpar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Diente Molar/cirugía , Retratamiento , Materiales de Obturación del Conducto Radicular/química , Obturación del Conducto Radicular/métodos , Tratamiento del Conducto Radicular/métodos , Tomografía Computarizada de Haz Cónico Espiral/métodos , Materiales Dentales , Humanos , Procesamiento de Imagen Asistida por Computador/métodos , Materiales de Obturación del Conducto Radicular/uso terapéutico , Preparación del Conducto Radicular/métodos , Microtomografía por Rayos X/métodos
9.
J Pak Med Assoc ; 69(8): 1084-1089, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31431757

RESUMEN

OBJECTIVE: To evaluate the root canal morphology of permanent mandibular first molars using Cone Beam Computed Tomography. METHODS: The retrospective study was done at Aga Khan University Hospital, Karachi, and comprised medical records of patients who visited the dental clinics from December 2016 to March 2017. Mandibular first permanent molars were evaluated on Cone Beam Computed Tomography images. Frequency distribution of Vertucci's classification was determined, and so was the association between Vertucci's classifications and gender. SPSS 20 was used for data analysis. RESULTS: A total of 142 mandibular first permanent molars were evaluated on 78 Cone Beam Computed Tomography images. The most common Vertucci's classification was Type IV for mesial root 86(60.56%) and Type I for distal root 63(44%). There was no difference in the two genders for root canal morphology (p>0.05). CONCLUSIONS: Type IV Vertucci's were prevalent in the mesial root and Type I were common in the distal root of permanent mandibular first molars.


Asunto(s)
Cavidad Pulpar/diagnóstico por imagen , Mandíbula/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen , Adolescente , Adulto , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pakistán , Estudios Retrospectivos , Adulto Joven
10.
Braz Oral Res ; 33: e082, 2019 Aug 26.
Artículo en Inglés | MEDLINE | ID: mdl-31460608

RESUMEN

The present study aimed to evaluate the internal configuration of the maxillary molars of a population from the Northeast region of Brazil. Cone-beam computed tomography (CBCT) exams from 512 patients (1501 teeth) were evaluated regarding the anatomical configuration of the root canal system, according to Vertucci's classification. The images were obtained using a Prexion 3D scanner operating at 90 kVp and 4 mA. The voxel size was 0.125 mm and the cut thickness was 1 mm. The images were then analyzed in the Prexion 3D Viewer software. The data were analyzed statistically by Pearson's chi-square test, with 5% of significance. The first and second molars presented three roots in 99.14% and 87.27% of the cases, respectively. In relation to the number of canals, the first and second molars had a significantly higher frequency of three and four root canals respectively, presenting a higher prevalence of types I and II (p < 0.001). The second mesiobuccal canal (MB2) was observed in 48.21% and 22.72% of the first and second molars, respectively (p < 0.001). The identification of the MB2 canal was greater in young and adult patients (p < 0.001), presenting a higher prevalence in male patients (p < 0.001). The internal configuration of the MB root was influenced by gender and by age, presenting a higher prevalence of the MB2 in male patients younger than 50 years of age.


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Cavidad Pulpar/anatomía & histología , Cavidad Pulpar/diagnóstico por imagen , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Adolescente , Adulto , Distribución por Edad , Factores de Edad , Anciano , Anciano de 80 o más Años , Brasil , Niño , Femenino , Humanos , Masculino , Maxilar , Persona de Mediana Edad , Valores de Referencia , Distribución por Sexo , Factores Sexuales , Adulto Joven
11.
Niger J Clin Pract ; 22(7): 957-960, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31293261

RESUMEN

Objectives: Hypercementosis (HC) is an asymptomatic excessive cementum deposition at the dental root apex. There is a lack of research that determines the pattern and associated factors of HC in Saudi Arabia. Materials and Methods: A retrospective cross-sectional study was conducted on a random sample of 815 Orthopantomograms (OPGs) that was obtained from a total of 14003 female patients archived OPGs. The OPGs were retrieved from the Kodak Carestream-R4 database for the period between 2015 and 2017 at Taibah University Dental College and Hospital (TUDCH), Al-Madinah Al-Munawwarah, Saudi Arabia. Width and radiodensity of HC were measured and the distribution was calculated. Association between HC and factors including age and nationality were explored. Descriptive and inferential analyses were performed. Results: The mean/SD age of HC affected patients (9.8%) was 30.16 ± 13.1 years, of whom 55% were Saudis. The mean/SD width and radiodensity of the hypercementosed roots were 4.14 ± 1.2 mm and 119.86 ± 29.83, respectively. The mandibular teeth were more frequently associated with hypercementosis (65%) specifically first molars (47.5%), while the majority (64%) had a single unilateral distribution pattern. There was a non-significant association between nationality, age, and HC (P = 0.921, P = 0.633, respectively). Conclusion: Hypercementosis observed in 9.8% of female patients attending TUDCH which was primarily unilateral and prominently confined to the mandibular teeth roots. The complication of teeth extraction among female patients in Almadinah region should be anticipated.


Asunto(s)
Hipercementosis/diagnóstico por imagen , Mandíbula/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Radiografía Panorámica/métodos , Adulto , Estudios Transversales , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Retrospectivos , Arabia Saudita , Adulto Joven
12.
Forensic Sci Med Pathol ; 15(4): 570-573, 2019 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-31327135

RESUMEN

PURPOSE: The introduction of modern 3D image acquisition systems has enabled researchers to develop novel procedures for personal identification. The present study aimed to assess differences between dental scans belonging to the same or different subjects, through an innovative 3D-3D superimposition and registration method. METHODS: Twelve subjects (6 males and 6 females) with pre- and post-orthodontic treatment dental casts were recruited. A 3D scan from each cast was obtained through a laser scanner and the 3D model of the upper first and second molar on the post-treatment cast was superimposed on the pre-treatment scan, for a total of 12 matches and 100 mismatches. Point-to-point RMS (root mean square) distance was then calculated. Student's t test verified possible statistically significant differences according to group (matches/mismatches; p < 0.05). RESULTS: In case of matches, on average the point-to-point distance RMS was 0.29 mm (SD: 0.08 mm), while it was 0.94 mm (SD: 0.30 mm) for mismatches, with a statistically significant difference (p < 0.001). CONCLUSIONS: Results show that the novel procedure was able to distinguish matches from mismatches through an RMS threshold (0.50 mm): a possible method for personal identification is described, which needs to be verified through the application to a larger sample of casts.


Asunto(s)
Modelos Dentales , Imagen Tridimensional , Diente Molar/diagnóstico por imagen , Adolescente , Femenino , Odontología Forense/métodos , Humanos , Rayos Láser , Masculino , Mandíbula , Maxilar , Estadística como Asunto , Adulto Joven
13.
Microsc Res Tech ; 82(10): 1748-1755, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31313438

RESUMEN

The aim of the study was to compare different imaging methods in the diagnosis of microcracks on root dentin and to evaluate the frequency of dentinal microcracks observed after root canal preparation using the ProTaper Universal (PTU) system of different sizes. A total of 30 mandibular molars' mesial roots were scanned with microcomputed tomography (micro-CT) and cone beam computed tomography (CBCT) imaging methods before instrumentation. Root canal instrumentation was performed up to PTU F2 and F4 files. After instrumentation stages, the roots were scanned again with micro-CT and then with CBCT in same parameters. All roots were sectioned horizontally at 2, 4, 6, 8, and 10 mm from the apices of the specimens. The sections were imaged under a stereomicroscope. Finally, imaging of the sections was done by scanning electron microscopy (SEM). Statistical data analysis of instrumentation steps was performed using Friedman and Wilcoxon tests, and the data of imaging methods were analyzed using Kruskal-Wallis and Mann-Whitney U tests (p = .05). Instrumentation with the PTU system up to F2 and F4 files significantly increased the number of microcracks compared with preoperative samples according to micro-CT imaging (p < .05). For detecting microcracks on the root dentin, there were no statistically significant differences between micro-CT (43.9%) and stereomicroscopy (45.8%) (p < .05). SEM showed significantly higher percentage of microcracks (88.3%) (p > .05). No microcrack was observed using the CBCT method. There were no statistically differences between micro-CT and stereomicroscopy. SEM showed more dentinal microcracks while no microcrack was observed with CBCT.


Asunto(s)
Dentina/diagnóstico por imagen , Dentina/lesiones , Diagnóstico por Imagen/métodos , Raíz del Diente/diagnóstico por imagen , Raíz del Diente/lesiones , Humanos , Diente Molar/diagnóstico por imagen , Diente Molar/lesiones , Preparación del Conducto Radicular/efectos adversos
14.
Br J Oral Maxillofac Surg ; 57(7): 666-671, 2019 09.
Artículo en Inglés | MEDLINE | ID: mdl-31239226

RESUMEN

In this retrospective study we investigated the long-term survival of autotransplanted premolars and molars with incompletely developed roots. The presence of the transplanted teeth and their outcome after autotransplantation was ascertained from clinical and radiographic evaluation by a maxillofacial surgeon or dentist. Kaplan Meier survival curves were estimated for the total population and for the two groups (premolars and molars). Fifty-one patients with 74 transplanted teeth were included, and the median duration of follow-up was 10 (range 1-20) years. Four of 66 premolars and one of 8 molars were removed and the cumulative survival was 95.4% (95% CI 90.3 to 100). The difference in survival between the premolars and molars was not significant. These results show that the long-term survival of autotransplanted teeth is good. Replacement of a single tooth by autotransplantation should therefore always be considered and is preferred when a suitable donor tooth is available.


Asunto(s)
Diente Premolar/diagnóstico por imagen , Diente Premolar/trasplante , Diente Molar/diagnóstico por imagen , Diente Molar/trasplante , Estudios de Seguimiento , Humanos , Estudios Retrospectivos , Factores de Tiempo , Trasplante Autólogo , Resultado del Tratamiento
15.
Acta Odontol Latinoam ; 32(1): 22-28, 2019 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-31206571

RESUMEN

Pulpectomies in primary molars are often hindered by several factors, including anatomical and physiological characteristics of posterior primary teeth and young patients' lack of cooperation with laborious treatments. This study was undertaken in search of easier but equally effective therapies that could eliminate infection, preserve the teeth and avoid extractions. The aim of the study was to estimate and compare clinical and radiographic success between pulp treatment with 3Mix-MP and pulpectomy with Maisto-Capurro paste in primary necrotic molars. A longitudinal prospective study was conducted at the Department of Comprehensive Pediatric Dentistry of the Faculty of Dentistry of the University of Buenos Aires (20152017). The study included 46 primary molars with necrotic pulp of children without immune or metabolic compromise. Children and their legal guardians provided assent and informed consent. Selected molars were randomly divided into 2 groups: G1: Pulpectomy treatment with Maisto-Capurro paste; and G2: Treatment with 3Mix-MP paste. Treatments were evaluated at 1, 3, 6,12 and 18 months (intra and inter-rater agreement 0.92 and 0.84). Clinical success was considered to be the absence of any of the following: pain, sensitivity to percussion or palpation, swelling, fistula and non-physiological mobility, while radiographic success was considered to be: absence of internal or external non-physiological resorption, no progression or reduction of radiolucent periapical/interradicular lesion and evidence of bone regeneration. Percentages, 95% C.I., and CHI2 were calculated for the comparison between groups. Overall clinical success was 91.5% and 87.5% (p=0.48) and overall radiographic success was 88.3% and 82.3% (p=0.31) for G1 and G2 respectively. No significant clinical or radiographic difference was found between groups. Both treatments showed similar clinical and radiographic behavior during the study periods.


Asunto(s)
Antibacterianos/uso terapéutico , Necrosis de la Pulpa Dental/diagnóstico por imagen , Necrosis de la Pulpa Dental/terapia , Diente Molar/diagnóstico por imagen , Pulpectomía , Materiales de Obturación del Conducto Radicular/uso terapéutico , Diente Primario , Niño , Endodoncia , Femenino , Humanos , Masculino , Estudios Prospectivos , Pulpectomía/efectos adversos , Resultado del Tratamiento
16.
J Craniofac Surg ; 30(4): e301-e303, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-31166273

RESUMEN

The Stafne bone defect (SBD) classically presents as a well-defined, radiolucent lesion in the molar-mandibular angle region beneath the level of the mandibular canal. Due in large part to this prototypical appearance, most cases of SBDs are radiographically diagnostic without the need for tissue biopsy. A diagnostic challenge may arise, however, when the SBD occurs in other locations in the mandible. The authors report a case of a 57-year-old male who presented with a SBD of the left ascending ramus. The lesion was found incidentally on a panoramic radiograph. Additional imaging studies confirmed a lingual concavity of the mandibular bone consistent with a SBD, and a retrospective study of the patient's records revealed the presence of the lesion 5 years prior without any radiographic alterations. To date, only 10 documented cases of an SBD involving the ascending ramus have been reported. The rarity of such a presentation may obscure the diagnosis and lead to unwarranted surgical procedures. It is important to recognize atypically located SBDs, because unlike other radiolucent lesions, imaging studies are diagnostic. With proper diagnosis, additional surgical procedures and any associated morbidities can be avoided.


Asunto(s)
Quistes Maxilomandibulares/diagnóstico por imagen , Enfermedades Mandibulares/diagnóstico por imagen , Biopsia , Humanos , Hallazgos Incidentales , Masculino , Mandíbula/diagnóstico por imagen , Persona de Mediana Edad , Diente Molar/diagnóstico por imagen , Radiografía Panorámica , Estudios Retrospectivos , Lengua/diagnóstico por imagen
17.
Endodoncia (Madr.) ; 37(1): 20-27, jun. 2019. tab, ilus
Artículo en Español | IBECS | ID: ibc-186292

RESUMEN

El conocimiento de la morfología del sistema de conductos radiculares y sus posibles variaciones, es fundamental para poder realizar un tratamiento endodóntico con mayor predictibilidad y una mayor tasa de éxito. El presente estudio, se elaboró con la finalidad de conocer la morfología del sistema de conductos en primeros molares permanentes superiores e inferiores, en Nicaragua, tomando como muestra 60 molares extraídos. Objetivo: Determinar mediante el uso de CBCT, la morfología radicular de primeros molares permanentes. Material y métodos: Se realizaron dos grupos, 30 primeros mola-res superiores y 30 primeros molares inferiores, montados sobre una placa de acrílico. Se realizó un CBCT previo de la anatomía radicular, haciendo cortes por cada milímetro de la raíz, obteniendo un total de 15 cortes por diente, los cuales fueron analizados detenidamente, observando la morfología interna del sistema de conductos, siguiendo la clasificación de Vertucci. 1Resultados: Según la clasificación de Vertucci, la morfología radicular más frecuente en molares superiores fue la tipo I (40%), en molares inferiores fue la tipo IV en raíces mesiales (36.7%) y tipo I en raíces distales (66.7%). Los primeros molares superiores pre-sentaron 3 raíces en el 100% de las muestras, y 4 conductos en el 43.3% de las muestras, mientras los primeros molares inferiores presentaron 2 raíces en el 93.3% de las muestras y 3 conductos en el 43.3% de las muestras


The knowledge of the root canal system morphology and its possible variations is fundamental to be able to perform an endodontic treatment with greater predictability as well as a higher success rate. The present study was elaborated with the purpose to know the morphology of the canal system in upper and lower permanent first molars, in Nicaragua, taking as sample 60 extracted molars. Objective: To determine, through the use of CBCT, the root morphology of permanent, superior and inferior first molars. Material and methods: Two groups, 30 first upper molars and 30 lower first molars, were mounted on an acrylic plate. The CBCT was performed on the roots, making cuts for each millimeter, in total obtaining 15 cuts, which were analyzed carefully and observing the internal morphology of the root canal system was observed, following the Vertucci classification. 1Results: According to the Vertucci classification, the most frequent root morphology in upper molars was type I (40%), in lower molars it was type IV in mesial roots (36.7%) and type I in distal roots (66.7%). The first upper molars had 3 roots in 100% of the samples, and 4 canals in 43.3% of the samples, while the lower first molars had 2 roots in 93.3% of the samples and 3 canals in 43.3% of the samples


Asunto(s)
Humanos , Cavidad Pulpar/diagnóstico por imagen , Tomografía Computarizada de Haz Cónico/métodos , Diente Molar/diagnóstico por imagen , Dentición Permanente , Diente Molar/anatomía & histología , Nicaragua , Estudios Transversales , Raíz del Diente/anatomía & histología , Raíz del Diente/diagnóstico por imagen
18.
Morphologie ; 103(341 Pt 2): 65-71, 2019 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-31036461

RESUMEN

PURPOSE: To investigate the position of the mental foramen based on its relation with the roots of the mandibular teeth and quantify the prevalence of anterior loop and satellite foramina in the mandible in cone beam computed tomography (CBCT) scans. METHODS: The sample consisted of 400 CBCT scans of males (n=190) and females (n=210) from Moscow, Russia. Using the system proposed by Tebo and Telford (1950), the position of the mental foramen was classified into: I) mesial to the mandibular first premolar; II) at the apex of the mandibular first premolar; III) between the roots of the mandibular first and second premolars; IV) at the apex of the mandibular second premolar; V) between the roots of the mandibular second premolar and first molar; and VI) at the apex of the roots of the mandibular first molar. Additionally, the images were assessed to investigate the prevalence of the anterior loop of the mandibular canal and the presence of satellite foramina. RESULTS: Mental foramen position class III was the most prevalent (61%) followed by class IV (27%), II (8%), I, V and VI (together <4%). Statistically significant differences were not detected between males and females (P<0.05). In Russian males and females, the anterior loop of the mandibular canal was found in 15.78% and 3%, respectively; while satellite foramina were found in 31.58% and 19.62%, respectively. CONCLUSION: The spatial position of the mental foramen and the morphological alterations of the mandibular canal and adjacent foramina must be known prior to surgical interventions in the mandible.


Asunto(s)
Mandíbula/anatomía & histología , Raíz del Diente/anatomía & histología , Adulto , Diente Premolar/anatomía & histología , Diente Premolar/diagnóstico por imagen , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Persona de Mediana Edad , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Factores Sexuales , Raíz del Diente/diagnóstico por imagen
19.
J Vet Dent ; 36(1): 32-39, 2019 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-31138050

RESUMEN

Mandibular fractures at the level of the first molar tooth (M1) were assessed in 29 dogs. Patients included in this study demonstrated fractures involving the M1 tooth, tooth bud, or alveolus (if tooth was absent). Diagnostic imaging evaluation included intraoral dental radiography and/or computed tomography (CT) with 3D reconstruction. The distal root was involved in 55.2% of cases, mesial root involvement in 34.5% of cases, and the tooth was absent in 10.3% of cases. Fractures were described in the rostral-to-caudal direction. Fractures tended to occur in the caudoventral direction ( P = .057). Cases with CT imaging were also evaluated in the buccolingual direction. Fractures were found to occur significantly more frequently in the caudolingual direction ( P = .022). When classifying fracture patterns along M1 according to a previously published fracture classification system, it was noted that fractures occurred significantly more frequently in either the mesial ( P < .001) or distal ( P < .001) roots by coursing along the periodontal ligament space and communicating with the periapical region. Active or nonworsening periodontitis was described as radiographic or tomographic evidence of (>25%) bone loss in the vertical or horizontal direction. Periodontitis was associated with 7 (24.1%) cases. These results help frame the challenges associated with fracture repair at the M1 location. Treatment planning considerations should include limited structural support caudal to fractures involving the distal root, more frequent involvement of the distal root over the mesial root, risk for poor endodontic prognosis, and the predilection for unfavorable fracture patterns to occur.


Asunto(s)
Enfermedades de los Perros/patología , Fracturas Mandibulares/veterinaria , Diente Molar/patología , Animales , Enfermedades de los Perros/diagnóstico por imagen , Perros , Fracturas Mandibulares/diagnóstico por imagen , Fracturas Mandibulares/patología , Diente Molar/diagnóstico por imagen , Radiografía Dental/veterinaria , Wisconsin
20.
Surg Radiol Anat ; 41(7): 815-822, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-30937566

RESUMEN

PURPOSE: To investigate the prevalence of isthmi and middle mesial (MM) canals in the mesial roots of mandibular first molars (MFM) in a Mongoloid subpopulation and to evaluate their association with demographic and anatomic characteristics. METHODS: Cone-beam computed tomography (CBCT) images of 496 patients with 823 MFMs were selected and analyzed. The following data were collected: patient age and gender, side, presence and distribution of MM canal and isthmus, distance between mesiobuccal (MB) and mesiolingual (ML) orifices, and MB-ML root canal system (RCS) morphology. Logistic regression was used to determine the association between demographic and anatomic characteristics and the presence of isthmi in the apical third. RESULTS: The overall prevalence of isthmus and an MM canal in MFM was 64.6% and 10.8%, respectively. The highest prevalence of isthmi and MM canals was found in patients of ≤ 20 and of 41-60 years, respectively (p < 0.05). The prevalence of isthmi declines with age. A total of 41.3% of the MFMs had isthmi in the apical third of the mesial roots. Younger age, shorter MB-ML orifice distance, and Weine type II RCS increased the probability of the presence of an isthmus in the apical third (p < 0.05). CONCLUSION: The prevalence of isthmus in MFM is high in the subject population, but the prevalence of MM canals is not as high as previously reported. Demographic and anatomic characteristics could aid clinicians to better predict the presence of MM canal and an isthmus.


Asunto(s)
Variación Anatómica , Cavidad Pulpar/anatomía & histología , Mandíbula/anatomía & histología , Diente Molar/anatomía & histología , Raíz del Diente/anatomía & histología , Adolescente , Adulto , Factores de Edad , Anciano , Grupo de Ascendencia Continental Asiática , Niño , Tomografía Computarizada de Haz Cónico , Cavidad Pulpar/diagnóstico por imagen , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Persona de Mediana Edad , Diente Molar/diagnóstico por imagen , Prevalencia , Factores Sexuales , Raíz del Diente/diagnóstico por imagen , Adulto Joven
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