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1.
Int J Oral Sci ; 12(1): 4, 2020 01 14.
Artículo en Inglés | MEDLINE | ID: mdl-31932579

RESUMEN

The morphology of the alveolar bone at the maxillary anterior teeth in periodontitis patients was evaluated by cone-beam computed tomography (CBCT) to investigate the distribution of alveolar defects and provide guidance for clinical practice. Ninety periodontitis patients and 30 periodontally healthy individuals were selected to determine the morphology of the alveolar bone at the maxillary anterior teeth according to the degree of bone loss, tooth type, sex and age. The differences in the dimensions between periodontitis patients and healthy individuals were compared, and the distribution of alveolar bone defects was analyzed. A classification system was established regarding the sagittal positions and angulations of the teeth. The buccal residual bone was thicker and the lingual bone was thinner in the periodontitis patients than in the periodontally healthy individuals, and there were differences between the different tooth types, sexes and age subgroups. The buccal undercut was close to the alveolar ridge, while fenestration was reduced and the apical bone height was higher in periodontitis patients than in periodontally healthy individuals. The apical bone height increased with the aggravation of bone loss and age. The proportions of different sagittal positions changed with the aggravation of bone loss. Moreover, the teeth moved more buccally regarding the positions of the maxillary anterior teeth. The morphology of the alveolar bone at the maxillary anterior teeth differed between periodontitis patients and healthy individuals, and the differences were related to the degree of bone loss, tooth type, sex and age.


Asunto(s)
Proceso Alveolar/diagnóstico por imagen , Tomografía Computarizada de Haz Cónico/métodos , Incisivo/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Periodontitis/diagnóstico por imagen , Adulto , Proceso Alveolar/anatomía & histología , Femenino , Humanos , Incisivo/anatomía & histología , Masculino , Maxilar/anatomía & histología , Estudios Retrospectivos , Ápice del Diente/anatomía & histología , Ápice del Diente/diagnóstico por imagen , Cuello del Diente/anatomía & histología , Cuello del Diente/diagnóstico por imagen
2.
Forensic Sci Int ; 301: 76-81, 2019 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-31132549

RESUMEN

The Kvaal method as a non-invasive method for age estimation based on the changes of pulpal size caused by secondary dentin deposition has been applied to different ethnics. However, its results are often conflicting and its accuracy is relatively poor. This study aimed to verify the applicability of the Kvaal method to estimate the ages of the Chinese population using digital panoramic radiographs and to formulate specific regression equations for use in Chinese subjects. A sample of 360 digital panoramic radiographs from northern Chinese population were selected, from which the pulpal size and width of six tooth types (maxillary central incisor, lateral incisor, second premolar, mandibular lateral incisor, canine, and first premolar) were measured using Kvaal's method. Then, inter- and intra-observer reliabilities were calculated to evaluate the reproducibility of those measurements. The correlation between chronological age and measurements was also examined and the Chinese-specific equations for age estimation were conducted. After comparing the accuracy of the Chinese-specific equation with the original Kvaal equation, the age of the Chinese population was clearly overestimated by Kvaal's equation, and a Chinese-specific equation could ameliorate age prediction accuracy. In addition, the residuals of the Chinese-specific equation were significantly lower than that of the original Kvaal's method. Thus, we concluded that the original Kvaal equation cannot accurately estimate age in the Chinese population. Although accuracy improved using the Chinese-specific equation that was based on Kvaal's methodology, the standard deviation remained large. In view of the lack of accurate age estimation methods for adults, we propose finding more correlated variables or combining other age estimation methods to increase the accuracy for adult age estimation.


Asunto(s)
Determinación de la Edad por los Dientes/métodos , Pulpa Dental/diagnóstico por imagen , Radiografía Dental Digital , Radiografía Panorámica , Ápice del Diente/diagnóstico por imagen , Diente/diagnóstico por imagen , Adulto , Anciano , Grupo de Ascendencia Continental Asiática , China , Pulpa Dental/anatomía & histología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Análisis de Regresión , Reproducibilidad de los Resultados , Programas Informáticos , Diente/anatomía & histología , Ápice del Diente/anatomía & histología , Raíz del Diente/anatomía & histología , Raíz del Diente/diagnóstico por imagen , Adulto Joven
3.
Med Oral Patol Oral Cir Bucal ; 24(2): e265-e270, 2019 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-30818321

RESUMEN

BACKGROUND: The purpose of this study was to evaluate of the patients who underwent apical resection. Besides assess the classification of resection side, localization, lesion size, approximation of anatomic structures and the purpose of the apical surgery retrospectively. MATERIAL AND METHODS: In this stutdy 782 patients and 1191 apical resection applied tooth evaluated. 504 of the patients were famale and 278 were male. Patients age was between 13 and 76 years old and operated between January 2016 and January 2017. The study includes incisor, canine and premolar teeth which had the apical resection as the first time. Operation side evaluated from orthopantomograph and periapical radiographs. RESULTS: There were 1191 teeth operated and 966 of them in maxilla and 225 of them in mandible. The number of the incisor teeth were 871, 177 were canine, 129 were premolar and one of them was molar. The total amount of 468 patients had operated by just 1 tooth, 454 of the operated teeth had cyst on the operation side. Premolar and molar side 21 of the 93 lesion had approximation with maxillar sinus. On the other hand in maxilla 39 of 569 lesion had approximation with nasal cavity. In mandibula 1 of the 15 lesion, which involved mandibular premolar teeth, had approximation with mental foramen. CONCLUSIONS: Apical resection operation mostly done for one tooth, and the lesion size was less than 10 milimeters. Furthermore apical resection mostly done for incisors cause of odontogenic cyst.


Asunto(s)
Apicectomía , Quistes Odontogénicos/patología , Ápice del Diente/anatomía & histología , Ápice del Diente/cirugía , Raíz del Diente/anatomía & histología , Raíz del Diente/cirugía , Adolescente , Adulto , Anciano , Apicectomía/efectos adversos , Fracaso de la Restauración Dental , Femenino , Humanos , Masculino , Mandíbula , Seno Maxilar/anatomía & histología , Persona de Mediana Edad , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Quistes Odontogénicos/diagnóstico por imagen , Radiografía Panorámica , Estudios Retrospectivos , Materiales de Obturación del Conducto Radicular , Ápice del Diente/diagnóstico por imagen , Raíz del Diente/diagnóstico por imagen , Adulto Joven
4.
Eur. j. anat ; 23(1): 17-25, ene. 2019. ilus, tab
Artículo en Inglés | IBECS | ID: ibc-181627

RESUMEN

External dental root morphology knowledge is fundamental for the implication in periodontal and implant dentistry branches. So far the literature available presents a few and not updated studies regarding this particular topic. The aim of this study is to investigate the morphometry of external gross anatomy of single-rooted premolars, focusing on length and tapering parameters. One hundred seventy four extracted teeth of European origin were used to measure the root length and diameter on the 4 radicular surfaces, starting from the cement- enamel junction to the root apex. Data were statistically analyzed with descriptive measures and any statistical significance (p value <0.05) was evaluated by means of T-student test. The length of the single-root mandibular and maxillary premolars resulted to be higher than those reported in literature. The data regarding the tapering showed a pronounced lowering of the diameter root from the middle point of the root. In addition, the single-rooted premolar showed to own an oval-shaped root characterized, in both arches, by a high variability, confirming the data reported in literature. The present morphometric study providing analytical data regarding the length, the tapering and the high variability of the single-root premolar highlights the need of an accurate knowledge of the root anatomy for a correct therapeutic approach in the daily clinical practice


No disponible


Asunto(s)
Humanos , Diente Premolar/anatomía & histología , Raíz del Diente/anatomía & histología , Odontometría/métodos , Mandíbula/anatomía & histología , Europa (Continente) , Pulpa Dental/anatomía & histología , Ápice del Diente/anatomía & histología
5.
J Investig Clin Dent ; 10(1): e12371, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-30468009

RESUMEN

AIM: The aim of the present study was to investigate bacterial leakage and marginal adaptation of bioceramic apical plugs. METHODS: Extracted human mandibular premolars were prepared to simulate open apex using No. 4 Peeso reamer in retrograde direction. In total, 150 specimens were divided into 10 groups by obturation with five bioceramics in two thicknesses. Groups 1, 3, 5, 7, and 9 were obturated with ProRootMTA, Biodentine, TotalFill BC RRM paste, TotalFill BC RRM putty, and RetroMTA at 3 mm, and groups 2, 4, 6, 8, and 10 were obturated with the same materials at 4 mm. Ten specimens in each group were evaluated for bacterial leakage of Enterococcus faecalis for 75 days. Five specimens from each group were sectioned to investigate the gap area under scanning electron microscope. RESULTS: The 3- and 4-mm Biodentine and TotalFill BC RRM putty groups and the 4-mm ProRootMTA group exhibited less bacterial leakage and lower mean percentage of gap area than those of the other groups. TotalFill BC RRM paste showed the highest leakage for both the 3- and 4-mm groups. CONCLUSION: The 3- and 4-mm Biodentine and TotalFill BC RRM putty groups and the 4-mm ProRootMTA group exhibited the best sealing ability and marginal adaptation of apical plugs.


Asunto(s)
Cerámica/química , Filtración Dental/prevención & control , Adaptación Marginal Dental , Ensayo de Materiales , Obturación del Conducto Radicular/métodos , Ápice del Diente , Compuestos de Aluminio , Diente Premolar , Compuestos de Calcio , Filtración Dental/microbiología , Materiales Dentales/química , Combinación de Medicamentos , Enterococcus faecalis , Gutapercha , Humanos , Técnicas In Vitro , Óxidos , Materiales de Obturación del Conducto Radicular , Preparación del Conducto Radicular/métodos , Silicatos , Ápice del Diente/anatomía & histología , Ápice del Diente/efectos de los fármacos , Raíz del Diente/anatomía & histología
6.
Clin Oral Investig ; 23(5): 2253-2263, 2019 May.
Artículo en Inglés | MEDLINE | ID: mdl-30288606

RESUMEN

OBJECTIVES: The aim was to assess the anatomical relationship of anterior maxillary teeth to the nasal floor in patients referred for apical surgery. MATERIALS AND METHODS: Cone beam computed tomographic images (CBCT) of 83 patients were analysed retrospectively to quantify the distances between the root apices of maxillary anterior teeth (canine to canine) to the nasal floor or maxillary sinus (whichever was closer). Secondary outcome variables were the distances of the periapical lesion to the nasal floor, distances of the apices to the labial and palatal bone plates as well as to the neighbouring teeth. RESULTS: A total of 93 teeth (39 central, 35 lateral incisors and 19 canines) were analysed. The mean shortest distances of the apices to the nasal floor (or maxillary sinus) were 8.54 mm for central incisors, 9.49 mm for lateral incisors and 5.39 mm for the canines. The canines exhibited a significantly shorter distance to the nasal floor/maxillary sinus. In the presence of an osteolysis, the distance to the nasal floor was significantly shorter compared to the teeth without lesions. The lateral and central incisors showed significant proximity to each other at the level of the future surgical resection (3 mm from the apex). CONCLUSIONS: A close proximity between apices and adjacent anatomical structures such as nasal floor, maxillary sinus or adjacent roots could be shown in some cases. CLINICAL RELEVANCE: CBCT could be a valuable adjunctive imaging tool prior to apical surgery in the anterior maxilla to assess the risk for and decrease the incidence of damage to neighbouring anatomical structures such as the nasal floor, maxillary sinus or adjacent roots.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Maxilar/anatomía & histología , Seno Maxilar/anatomía & histología , Paladar (Hueso)/anatomía & histología , Ápice del Diente/anatomía & histología , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Maxilar/diagnóstico por imagen , Seno Maxilar/diagnóstico por imagen , Persona de Mediana Edad , Paladar (Hueso)/diagnóstico por imagen , Estudios Retrospectivos , Ápice del Diente/diagnóstico por imagen , Adulto Joven
7.
Int Endod J ; 52(2): 250-257, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-30091141

RESUMEN

AIM: To compare the efficiency of M-Wire Reciproc and Reciproc Blue instruments in the removal of root filling material and in their ability to regain apical patency through micro-computed tomographic (micro-CT) analysis. METHODOLOGY: Ten anatomically matched pairs of teeth, with a single oval-shaped straight canal, were selected and scanned in a micro-CT device. The root canals were prepared with M-Wire Reciproc R25 instruments and filled with gutta-percha and AH Plus sealer. The root canals were then randomly allocated into two groups (n = 10), according to the instrument used: M-Wire Reciproc and Reciproc Blue. The canals were retreated up to instrument sizes 25 and then 40 in both groups. The surface area and volume of residual filling material were assessed using micro-CT imaging after the retreatment procedures. The time required to remove the root fillings was recorded. Data were analysed statistically using t-test with a significance level of 5%. RESULTS: No significant difference (P > 0.05) was observed between the instruments in terms of the volume of residual root filling material. Apical enlargement from size 25 to 40 significantly improved the removal of filling materials (P < 0.05). It was possible to regain apical patency in all specimens from both M-Wire Reciproc and Reciproc Blue groups. No difference was observed in the time required to perform the retreatment between the instruments. CONCLUSIONS: Both M-Wire Reciproc and Reciproc Blue instruments were effective in removing filling materials from oval-shaped straight canals. Apical patency was reestablished in all specimens.


Asunto(s)
Instrumentos Dentales , Materiales de Obturación del Conducto Radicular/química , Obturación del Conducto Radicular/instrumentación , Obturación del Conducto Radicular/métodos , Preparación del Conducto Radicular/instrumentación , Preparación del Conducto Radicular/métodos , Anatomía Transversal , Aleaciones Dentales/química , Cavidad Pulpar/diagnóstico por imagen , Diseño de Equipo , Gutapercha/química , Humanos , Incisivo/anatomía & histología , Incisivo/diagnóstico por imagen , Incisivo/cirugía , Mandíbula , Ensayo de Materiales , Níquel/química , Retratamiento , Irrigantes del Conducto Radicular , Hipoclorito de Sodio/química , Propiedades de Superficie , Titanio , Ápice del Diente/anatomía & histología , Microtomografía por Rayos X/métodos
8.
Int. j. morphol ; 36(4): 1229-1234, Dec. 2018. tab, graf
Artículo en Español | LILACS | ID: biblio-975688

RESUMEN

El conocimiento preciso de la morfología radicular dental son claves para el éxito en las terapias endodónticas. El objetivo de este estudio fue evaluar las distintas variaciones de la morfología radicular y apical en primeros molares superiores e inferiores de una población maya moderna. Se observaron microfotografías provenientes de 80 primeros molares superiores e inferiores, presentadas en cortes transversales a 1 y 2,5 mm del vértice apical, así como de las porciones 1/3, 1⁄2, 2/3 del largo radicular y en la unión amelocementaria. Se determinó el número de raíces, conductos y configuración de Vertucci, así como forma y medidas de diámetro mayor y menor a 1 mm del vértice apical. El 90 % de primeros molares superiores reportó la presencia de 3 raíces y el 10 % mostró 2. En tanto que el total de primeros molares inferiores (100 %) reportó 2 raíces. En general, en las raíces mesiales prevaleció el Tipo II de Vertucci mientras que en las distales y palatinas la Tipo I. En el corte a 1 mm del vértice apical la forma redonda fue la de mayor prevalencia en los conductos de primeros molares superiores (44,5 %), seguida de la irregular (34,1 %) y la oval (21,4 %); mientras que en los primeros molares inferiores la más prevalente fue la irregular (54, 5 %), seguida de la redonda (23,9 %) y oval (21,6 %). Los diámetros mayor y menor de los conductos mesiales a 1 mm apical midieron 0,46 y 0,23 mm y 0,64 y 0,25 mm en molares superiores e inferiores respectivamente. La frecuencia de MB2 en primeros molares superiores fue del 77,8 %. Los conductos con mayor variabilidad fueron los mesiales. Se observó baja frecuencia de conductos ovales. Los diámetros mayores de los conductos mesiales en general, fueron superiores a 0,45 mm.


Accurate knowledge of dental root morphology is a key to success in endodontic therapies. The aim of this study was to evaluate the different variations of the root and apical morphology in upper and lower first molars of a modern Mayan population. Photomicrographs were taken from 80 upper and lower first molars, presented in cross sections at 1 and 2.5 mm from the apical vertex, as well as from the 1/3, 1⁄2, 2/3 portions of the root length and at the cementoenamel junction. The number of roots, canal and Vertucci`s configuration was determined, as well as the shape and measurements of the major and minor diameters at 1 mm from the apex. In this study 90 % of upper first molars reported the presence of 3 roots and 10 % showed 2, while the total lower first molars (100 %) reported 2 roots. In general, Vertucci`s Type II prevailed in the mesial roots while Type I was prevalent in the distal and palatal ones. In the 1 mm cut of the apical vertex, the round shape was the most prevalent in the canal of the first upper molars (44.5 %), followed by irregular (34.1 %) and oval (21.4 %); while in the first lower molars the most prevalent one was irregular (54.5 %), followed by round (23.9 %) and oval (21.6 %). The major and minor diameters of the mesial canals at 1 mm apical recorded 0.46 and 0.23 mm and 0.64 and 0.25 mm in upper and lower molars respectively. The frequency of MB2 in upper first molars was 77.8 %. The canals with greater variability were the mesial ones. Low frequency of oval canals was observed. The largest diameters of the mesial canal in general were greater than 0.45 mm.


Asunto(s)
Humanos , Masculino , Femenino , Adolescente , Adulto , Persona de Mediana Edad , Anciano , Anciano de 80 o más Años , Raíz del Diente/anatomía & histología , Indios Norteamericanos , Diente Molar/anatomía & histología , Ápice del Diente/anatomía & histología
9.
J Endod ; 44(12): 1796-1801, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30477665

RESUMEN

INTRODUCTION: Current pulp revascularization procedures in teeth with necrotic pulps and open apices have produced histologic evidence of connective tissue growth, cementum, and bone within the root canals of experimental animals. This study aims to investigate the effect of maintaining uninflamed residual apical pulp tissue on the histologic outcome of pulp-dentin complex regeneration after a revascularization procedure in immature ferret cuspid teeth. METHODS: Twenty-eight cuspid teeth from 7 young male ferrets were used in this experiment. Seven teeth were reserved to serve as positive control samples without any treatment. In another 7 teeth, the pulp was completely extirpated (negative control), whereas the pulp of the remaining 14 teeth were removed to either 1-2 mm short of the apex (7 samples) or 2-4 mm short of the apex (7 samples). Blood clots were covered with mineral trioxide aggregate at the cementoenamel junction level of each tooth. Three months later, block sections were removed for histologic evaluations, and the data were statistically analyzed with the chi-square test (P < .05). RESULTS: All teeth with complete pulp extirpation showed the presence of bone inside the root canal. In contrast, the root canals for most teeth with pulp amputation 1-4 mm from the radiographic apex were filled with normal pulp, which extended coronally to the mineral trioxide aggregate, where hard tissue bridges had formed. CONCLUSIONS: Based on these results, we concluded that regeneration of the pulp-dentin complex is possible when the apical 1-4 mm of the apical pulp remains intact in immature teeth.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Pulpa Dental/fisiología , Dentina/fisiología , Tejido Periapical/fisiología , Regeneración , Ápice del Diente/anatomía & histología , Animales , Remodelación Ósea , Diente Canino , Cemento Dental , Pulpa Dental/anatomía & histología , Dentinogénesis , Hurones , Masculino , Odontogénesis , Tejido Periapical/anatomía & histología
10.
J Endod ; 44(12): 1872-1877, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30390968

RESUMEN

INTRODUCTION: This study evaluated the accuracy of 3 electronic apex locators (EALs) (CanalPro [Coltene-Endo, Cuyahoga Falls, OH], Apex ID [SybronEndo, Glendora, CA], and Root ZX Mini [J Morita, Tokyo, Japan]) in curved mesial canals of extracted mandibular molars using micro-computed tomographic (micro-CT) scanning. METHODS: The root canal length and the actual working length of 58 canals were measured using the visual method and 3-dimensional micro-CT reconstructions. The measurements of the EALs at marks "APEX/0.0" and "0.5 mark" were recorded as the electronic root canal length and the electronic working length, respectively. The absolute mean values and the percentages of distribution of the electronic measurements were compared with the actual lengths of the canals. The presence of isthmuses, accessory canals, foramen position, and the distance between the apical constriction and the apical foramen were recorded from the micro-CT scans, and their correlation to the accuracy of the EALs was determined. RESULTS: All electronic measurements showed high agreement with their respective gold standard, except the electronic root canal length of the Apex ID (P < .05). No difference in the percentage of precise measurements (within the ±0.5 mm) was found among the devices (χ2 and z tests, P > .05). Of the anatomic parameters evaluated, the presence of a lateral foramen negatively affected the 0.0 mark of the Apex ID (Wilcoxon test, P < .05). CONCLUSIONS: The Root ZX Mini and CanalPro were precise for both root canal length and working length determination in mesial curved canals of mandibular molars, whereas the Apex ID was accurate for the working length when using the 0.5 mark.


Asunto(s)
Instrumentos Dentales , Cavidad Pulpar/anatomía & histología , Cavidad Pulpar/diagnóstico por imagen , Diente Molar/anatomía & histología , Diente Molar/diagnóstico por imagen , Odontometría/instrumentación , Tratamiento del Conducto Radicular/instrumentación , Ápice del Diente/anatomía & histología , Ápice del Diente/diagnóstico por imagen , Microtomografía por Rayos X/métodos , Precisión de la Medición Dimensional , Electrónica Médica , Humanos , Mandíbula
11.
J Endod ; 44(12): 1862-1866, 2018 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-30390974

RESUMEN

INTRODUCTION: The purpose of this study was to evaluate the accuracy of small-volume cone-beam computed tomography (CBCT) to detect and measure isthmi in the apical root canals of mandibular molars by using micro-computed tomography (µ-CT) as the reference standard. METHODS: Forty mandibular first molars selected on the basis of µ-CT scan and presenting isthmi in the apical 3-mm mesial roots were scanned by using the highest-resolution settings of a small-volume CBCT unit. Isthmi lengths were measured and compared between both µ-CT and CBCT images to study the accuracy of CBCT readings. Quantitative data for sensitivity rate were depicted as percentage value with 95% confidence interval. Results were analyzed by using linear regression between true lengths (µ-CT) and CBCT lengths, Bland-Altman plot and t test, at α = 0.05. RESULTS: CBCT sensitivity for isthmi detection was 65% (95% confidence interval, 0.4667-0.8333). An average of 74.7% of the lengths could be measured, and differences among the lengths in µ-CT and CBCT were significant (P < .05; mean, 0.756 ± 0.655; t test), showing that there was no agreement between both methods. CONCLUSIONS: Accuracy of identifying apical isthmi of mandibular molars was highly influenced by the evaluation method. Small-volume CBCT imaging could not detect and measure apical isthmi length accurately. Moreover, using high-resolution settings in CBCT, it was not reliable to forecast the actual apical root canal anatomy.


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Cavidad Pulpar/anatomía & histología , Intensificación de Imagen Radiográfica , Ápice del Diente/anatomía & histología , Humanos , Mandíbula , Diente Molar/anatomía & histología , Sensibilidad y Especificidad
12.
Am J Orthod Dentofacial Orthop ; 154(4): 524-534, 2018 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-30268263

RESUMEN

INTRODUCTION: The purpose of this study was to evaluate the short-term impact of rapid maxillary expansion (RME) on the eruption paths of ectopically and normally erupting maxillary canines in the mixed dentition. METHODS: Thirty-two patients with 49 ectopically erupting canines (EEC group; age, 9.53 ± 1.10 years) and 18 patients with 27 normally erupting canines (NEC group; age, 9.25 ± 1.06 years) underwent RME. Thirty-six subjects with 54 normally erupting canines composed the untreated control group (UC group; age, 9.03 ± 0.72 years). Horizontal, vertical, and angular positions of canines and adjacent teeth were evaluated in the expanded (EEC and NEC groups) and unexpanded (UC group) patients using panoramic radiographs taken at 2 times with a 1-year interval. The radiographic evaluation methods included score ranking and proportional measurements to minimize panoramic radiograph limitations. Statistical comparisons were performed among the groups (P <0.05). RESULTS: Before expansion, the EEC group's canines were significantly closer to the midline, more distant from the occlusal plane, and more mesially angulated than those in the UC group. After expansion, the canine positions in the EEC and UC groups were similar, whereas the NEC group had a more favorable canine position for eruption. The EEC and NEC groups showed similar canine positional changes, whereas the UC group had the smallest changes. The positions of teeth adjacent to the canine were also significantly affected by RME, and these changes may be associated with improvement of the ectopic canine position. CONCLUSIONS: The changes produced by RME reduced the percentage of ectopic eruption paths and maintained the nonectopic eruption percentage.


Asunto(s)
Diente Canino/anatomía & histología , Diente Canino/patología , Técnica de Expansión Palatina/efectos adversos , Resorción Radicular/etiología , Erupción Ectópica de Dientes/etiología , Erupción Dental , Brasil , Niño , Diente Canino/efectos de los fármacos , Arco Dental/diagnóstico por imagen , Dentición Mixta , Femenino , Humanos , Incisivo/anatomía & histología , Incisivo/diagnóstico por imagen , Masculino , Maxilar/diagnóstico por imagen , Maxilar/patología , Radiografía Panorámica , Resorción Radicular/diagnóstico por imagen , Ápice del Diente/anatomía & histología , Ápice del Diente/patología , Erupción Ectópica de Dientes/diagnóstico por imagen , Técnicas de Movimiento Dental/efectos adversos , Raíz del Diente/anatomía & histología , Raíz del Diente/diagnóstico por imagen , Diente Primario
13.
J Endod ; 44(11): 1741-1748, 2018 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-30266469

RESUMEN

INTRODUCTION: The purpose of this study was to determine the position of the apical foramen (AF) in relation to root surfaces of human permanent teeth using cone-beam computed tomographic (CBCT) imaging and novel advanced imaging analysis software (e-Vol DX; CDT Software, Bauru, SP, Brazil). METHODS: The AF position was determined on CBCT scans viewed and analyzed using e-Vol DX of 1400 teeth (422 patients) according to the root surface as follows: buccal, mesiobuccal, mesial, mesiolingual/palatal, lingual/palatal, distolingual/palatal, distal, distobuccal, and central. Categoric variables were described as frequencies and percentages. Frequencies were reported with their confidence intervals (95%). Categoric variables were analyzed using the chi-square test with Yates correction. The level of significance was set at α = 0.05. RESULTS: The most frequent AF position in maxillary anterior teeth was central (46%-60%). The AF in mandibular central incisors was buccal in 44% of the cases. In maxillary first and second premolars, 39.98% and 42.56% of all AFs were central. In maxillary first and second molars, 46.12% and 57.49% of all AFs were central. The most frequent AF position in mandibular first and second premolars was central (42.85% and 50.98%). In mandibular first molars, 48.72% of all AFs were central. CONCLUSIONS: The AF position in human permanent teeth was central in 48.95% and 42.08% of the maxillary and mandibular teeth. CBCT images analyzed by e-Vol DX can be used to determine the true anatomic position of the AF and can be a useful tool for the treatment planning of nonsurgical and surgical endodontic treatments.


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Dentición Permanente , Radiografía Dental/métodos , Programas Informáticos , Ápice del Diente/anatomía & histología , Ápice del Diente/diagnóstico por imagen , Raíz del Diente/anatomía & histología , Raíz del Diente/diagnóstico por imagen , Adulto , Femenino , Humanos , Masculino
14.
Eur J Oral Sci ; 126(4): 307-315, 2018 08.
Artículo en Inglés | MEDLINE | ID: mdl-29972599

RESUMEN

In-vitro studies suggest that electromagnetic interference can occur under specific conditions involving proximity between electronic dental equipment and pacemakers. At present, in-vivo investigations to verify the effect of using electronic dental equipment in clinical conditions on patients with pacemakers are scarce. This study aimed to evaluate, in vivo, the effect of three commonly used electronic dental instruments - ultrasonic dental scaler, electric pulp tester, and electronic apex locator - on patients with different pacemaker brands and configurations. Sixty-six consecutive non-pacemaker-dependent patients were enrolled during regular electrophysiology follow-up visits. Electronic dental tools were operated while the pacemaker was interrogated, and the intracardiac electrogram and electrocardiogram were recorded. No interferences were detected in the intracardiac electrogram of any patient during the tests with dental equipment. No abnormalities in pacemaker pacing and sensing function were observed, and no differences were found with respect to the variables, pacemaker brands, pacemaker configuration, or mode of application of the dental equipment. Electromagnetic interferences affecting the surface electrocardiogram, but not the intracardiac electrogram, were found in 25 (37.9%) patients, especially while using the ultrasonic dental scaler; the intrinsic function of the pacemakers was not affected. Under real clinical conditions, none of the electronic dental instruments tested interfered with pacemaker function.


Asunto(s)
Equipo Dental , Análisis de Falla de Equipo , Marcapaso Artificial , Anciano , Prueba de la Pulpa Dental/instrumentación , Raspado Dental/instrumentación , Campos Electromagnéticos , Diseño de Equipo , Femenino , Humanos , Masculino , Odontometría/métodos , España , Ápice del Diente/anatomía & histología
15.
BMC Oral Health ; 18(1): 94, 2018 05 31.
Artículo en Inglés | MEDLINE | ID: mdl-29855300

RESUMEN

BACKGROUND: The purpose of this study was to investigate variations in the root canal systems of permanent maxillary first premolars in a Yemeni population using a clearing technique. METHODS: Two hundred fifty permanent maxillary first premolar teeth extracted from Yemeni individuals were collected. A small hole in the center of the occlusal surface of each tooth was prepared and pulp tissue was removed by immersion in 5.25% sodium hypochlorite. Teeth were stored in 5-10% nitric acid solution for 5-6 days. Next, teeth were rinsed, dried, and dehydrated using ascending concentrations of ethanol (70, 95, and 100%) successively for 12 h each. Waterproof black ink was injected into the dried dehydrated teeth. Stained teeth were then rendered clear by immersion in methyl salicylate solution (98%) until evaluation. Root canal morphology of each tooth was then examined. RESULTS: 54.8% of teeth were single-rooted, while 44.4% were double-rooted and only 0.8% had three separated roots. The most common canal system configuration was Vertucci type IV (55.6%). Eight specimens of the single-rooted premolars (3.2%) had new canal configurations that have not been recognized in previous published studies. Accessory canals and inter-canal communications were detected in a total of 52.8 and 34.4% of the specimens, respectively. The apical foramen was located centrally to the apex in 84.9% and apical deltas were found in 13.2% of the studied sample. CONCLUSIONS: Yemeni permanent maxillary first premolars are mainly single-rooted and predominantly present Vertucci type IV canal morphology. The finding of additional canal configurations in this study is low but should be kept in mind when performing endodontic therapy for these teeth.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Raíz del Diente/anatomía & histología , Adulto , Diente Premolar/anatomía & histología , Humanos , Maxilar/anatomía & histología , Persona de Mediana Edad , Ápice del Diente/anatomía & histología , Yemen , Adulto Joven
16.
Niger J Clin Pract ; 21(6): 772-777, 2018 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-29888726

RESUMEN

Objectives: : We compared apical transportation in the WaveOne and ProTaper Next systems, which are rotary nickel-titanium systems with reciprocating and continuous rotation movements, respectively, using manual measurements obtained from resin blocks with simulated root canals and double digital radiographs of extracted teeth. Materials and Methods: : We used 30 resin blocks with simulated root canals and 30 extracted teeth for this study. The same endodontist performed root canal shaping using the WaveOne or ProTaper Next system. We assessed apical transportation by measuring the amounts (in mm) of material lost 1 mm from the apical foramen in the resin blocks and by using double digital radiography for the extracted teeth. Significant differences between groups were assessed using t-tests. P < 0.05 was considered statistically significant. Results: : The amount of apical transportation differed significantly between the two systems when resin blocks were used for assessment (P < 0.05), but there were no significant differences when extracted teeth were used (P < 0.05). Conclusions: In the current study, there was no significant difference in apical transportation between natural teeth prepared using WaveOne and those prepared using ProTaper Next. However, significant differences were observed between the two systems with resin blocks. These findings indicate that the use of resin blocks is not an accurate method for apical transportation evaluation.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Cavidad Pulpar/cirugía , Diente Molar/cirugía , Níquel/química , Preparación del Conducto Radicular/instrumentación , Tratamiento del Conducto Radicular/instrumentación , Aleaciones , Instrumentos Dentales , Humanos , Procesamiento de Imagen Asistida por Computador/métodos , Diente Molar/diagnóstico por imagen , Preparación del Conducto Radicular/métodos , Tratamiento del Conducto Radicular/métodos , Rotación , Titanio/química , Ápice del Diente/anatomía & histología , Extracción Dental , Transportes
17.
J Endod ; 44(5): 738-743, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29550011

RESUMEN

INTRODUCTION: The present study aimed to anatomically assess mandibular posterior teeth using cone-beam computed tomographic (CBCT) imaging for endodontic surgery. METHODS: A total of 170 CBCT scans were evaluated for anatomic variations of mandibular posterior teeth. All the scans were obtained using a Planmeca Promax CBCT unit (Planmeca, Helsinki, Finland) with exposure settings of 90 kVp, 12 mA, 12 seconds, and 0.3-mm resolution. All CBCT images were reconstructed by Romexis Viewer 3.8.2. software (Planmeca) on a 16-inch LCD monitor (22MP47HQ; LG, Seoul, South Korea), and axial, coronal and sagittal views were evaluated. RESULTS: The thickest buccal cortical plate was observed over the distal root of second molars (12.30 mm) among the molar teeth and over the second premolar root (5.41 mm) among the premolar teeth. The thinnest buccal cortical plate was observed over both the first and second premolar roots (0.42 mm) and over the mesial root of the first molar (0.62 mm) tooth. A 20.38-mm section was removed for surgical access during buccal resection of the distal root of the left second molar, and the closest distance from the apex to the inferior alveolar canal was 0 mm. CONCLUSIONS: Adequate knowledge of the anatomic dimensions of teeth and their surrounding structures is imperative for endodontic surgery. Information concerning the root thickness of mandibular posterior teeth at the site of root resection (apical 3 mm), buccal cortical plate thickness, and the distance from the apex of each tooth to the inferior alveolar canal and mental foramen can guide the surgeon before and during surgery.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Diente Molar/diagnóstico por imagen , Radiografía Dental , Adolescente , Adulto , Anciano , Femenino , Humanos , Masculino , Mandíbula/diagnóstico por imagen , Persona de Mediana Edad , Diente Molar/anatomía & histología , Procedimientos Quirúrgicos Orales , Ápice del Diente/anatomía & histología , Ápice del Diente/diagnóstico por imagen , Raíz del Diente/anatomía & histología , Raíz del Diente/diagnóstico por imagen , Adulto Joven
18.
Int. j. morphol ; 36(1): 164-168, Mar. 2018. tab, graf
Artículo en Inglés | LILACS | ID: biblio-893205

RESUMEN

SUMMARY: The purpose of this study was to determine the shape and diameter of the physiological foramen in maxillary premolars of a Chilean population. The sample consisted of 125 extracted maxillary premolars, in which the apical three to five millimeters were cut and observed under magnification of 40x, photographed (Motic Cam), and analyzed using Motic Images Plus 2.0 ML in order to obtain measurements of the minor and major diameter of each physiological foramen. The average minor and major diameter in maxillary premolars was 0.270 and 0.413 mm, respectively. In terms of shape, 72.19 % had oval shaped physiological foramen; 18.93 % were irregularly shaped and 8.88 % were round. Oval and irregular canals are significantly more difficult to shape and require special attention in order to obtain a thoroughly disinfected root canal system.


RESUMEN: El objetivo del estudio fue determinar la forma y el diámetro del foramen fisiológico de premolares maxilares en una población Chilena. La muestra consistió en 125 premolares maxilares extraídos, a los que se cortó de 3 a 5 milímetros apicales, fueron observados bajo magnificación de 40x, fotografiado (Motic Cam) y analizados utilizando Motic Images Plus 2.0 ML para obtener las mediciones de el diámetro menor y mayor de cada foramen fisiológico. El promedio del diámetro menor y mayor en premolares maxilares fue de 0,270 y 0,413 mm respectivamente. En cuanto a la forma 72,19 % tenía el foramen fisiológico de forma oval; 18,93 % tenía forma irregular y 8,88 % fue redondo. Canales ovales e irregulares son significativamente más difíciles de conformar y requieren especial atención para obtener una adecuada desinfección del sistema de canales radiculares.


Asunto(s)
Humanos , Masculino , Femenino , Adulto , Diente Premolar/anatomía & histología , Ápice del Diente/anatomía & histología , Chile , Maxilar
19.
J Endod ; 44(4): 555-558, 2018 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-29426647

RESUMEN

INTRODUCTION: This study aimed to investigate the difference in the location of the inferior alveolar nerve (IAN) in relation to the apices of mandibular molars in 3 different populations using cone-beam computed tomographic (CBCT) imaging and to assess the proportion of teeth in close proximity (a distance of 1 mm or less) to the IAN. METHODS: Random CBCT images (N = 1224, Israel = 408, South Korea = 416, and India = 400) were examined. The shortest distance to the mandibular canal was measured by imaging software. RESULTS: The mean distance was 4.81 ± 2.15 mm. The mean distances for Israel, South Korea, and India were 4.60 ± 2.37 mm, 5.45 ± 2.13 mm, and 4.35 ± 1.76 mm, respectively. The distance in samples obtained from South Korea was significantly larger than the distance in samples obtained from Israel and India (P < .05). Samples from Israel exhibited close proximity in 6.6% of samples versus 3% in samples from India and 0.7% of samples from South Korea, a statistically significant difference (P < .05). CONCLUSIONS: Although variation in tooth morphology in different populations was widely researched, the variation in the location of the IAN in relation to tooth apices of different populations was not addressed in the literature. Our study reveals that a difference in the distance of the apices to the IAN exists between populations as well as a difference in the proportion of teeth in close proximity to the IAN.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Cavidad Pulpar/diagnóstico por imagen , Radiografía Dental , Ápice del Diente/diagnóstico por imagen , Cavidad Pulpar/anatomía & histología , Humanos , India , Israel , Mandíbula/anatomía & histología , Mandíbula/diagnóstico por imagen , República de Corea , Ápice del Diente/anatomía & histología
20.
J Appl Oral Sci ; 26: e20170215, 2018 Jan 18.
Artículo en Inglés | MEDLINE | ID: mdl-29364346

RESUMEN

To evaluate the amount of apically extruded debris, percentage of foraminal enlargement and apical foramen (AF) deformation that occurred during root canal preparation with different reciprocation systems: Reciproc, WaveOne (M-Wire), and ProDesign R (Shape Memory Technology Wire) at two different working lengths (WLs): 0.0 and 1.0 mm beyond the AF. The AF of 120 root canals in 60 mesial roots of mandibular molars were photographed with stereomicroscope and randomly assigned into four groups: manual, Reciproc (REC), WaveOne (WO), and ProDesign R (PDR); subsequently, they were further subdivided according to the WL (n=15). Teeth were instrumented, coupled to a dual collecting chamber, and then another photograph of each AF was captured. Extrusion was analysed by determining the weight of extruded debris. Each AF diameter was measured in pre- and post-instrumentation images to determine deformation, which was analysed, and afterwards the final format of AFs was classified (circular/oval/deformed). We found no significant differences when analysing each system at different WLs. When considering each WL, REC and WO showed highest extrusion values (P<.05); for AF enlargement, differences were observed only for WO, when it was used beyond the AF; differences were observed among M-Wire groups beyond the AF (P<.05). AF deformation was observed in all groups; PDR showed the lowest AF deformation values at both WLs; M-Wire groups showed 50% strain beyond the AF. Authors concluded that beyond the apical limit, the alloy and taper are important aspects when considering extrusion and deformation.


Asunto(s)
Níquel/química , Preparación del Conducto Radicular/efectos adversos , Preparación del Conducto Radicular/instrumentación , Titanio/química , Ápice del Diente/lesiones , Instrumentos Dentales/efectos adversos , Diseño de Equipo , Humanos , Distribución Aleatoria , Valores de Referencia , Reproducibilidad de los Resultados , Preparación del Conducto Radicular/métodos , Estadísticas no Paramétricas , Ápice del Diente/anatomía & histología
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