Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 89
Filtrar
1.
Microsc Res Tech ; 82(7): 1057-1064, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-30889319

RESUMEN

The aim of this study was to evaluate three reciprocating systems and complementary cleaning methods on filling material removal during retreatment of flattened canals. Thirty-six mandibular incisors were prepared using rotary instruments up to size 25.08 and filled using the single-cone technique. Subsequently, the teeth were divided into three groups (n = 12) according to retreatment procedures: Reciproc Blue (RB): 25/0.08 and 40/0.06; ProDesign R (PDR): 25/0.06 and 35/0.05; and WaveOne Gold (WOG): 25/0.07 and 35/0.06. The remaining filling volume materials were assessed by means of micro-CT imaging before and after retreatment. After this, the specimens were subdivided into three groups according to complementary cleaning methods: XP-Endo Shaper (30/0.01); passive ultrasonic irrigation (PUI); 60° oscillatory instrumentation with #30 H-file, and micro-CT scan was taken. Then, the roots were cut in half and the samples were analyzed by scanning electron microscope (SEM). The data were analyzed statistically using Kruskal-Wallis and Dunn's Multiple Comparison test with significance level of 5%. None of the reciprocating files promoted complete removal of filling material and there was no statistical difference between the groups, regardless instrument size (p > 0.05). Complementary cleaning methods increased remnant filling removal (p < 0.05). XP-endo Shaper significantly reduced the amount of filling material in the apical and middle thirds, compared with H-files (p < 0.05), with no difference with PUI. In the SEM, there was no statistical difference among the instruments (p > 0.05). The reciprocating systems showed similar effectiveness in removing root filling material. Complementary cleaning method with the XP-Shaper enhanced filling material removal.


Asunto(s)
Cavidad Pulpar/efectos de los fármacos , Materiales de Obturación del Conducto Radicular/farmacología , Obturación del Conducto Radicular/normas , Preparación del Conducto Radicular/métodos , Humanos , Microscopía Electrónica de Rastreo , Retratamiento , Preparación del Conducto Radicular/normas , Microtomografía por Rayos X
2.
J Endod ; 44(8): 1257-1262, 2018 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-29935868

RESUMEN

INTRODUCTION: Reports comparing clinical outcomes using nickel-titanium (NiTi) reciprocating instruments with other instrumentation modalities are scarce. This study examined initial shaping outcomes after an instrumentation change of root canal instrumentation technique in a doctor of dental surgery educational program. Student characteristics, faculty/student ratio, facility, and overall endodontic treatment guidelines remained unchanged. METHODS: A total of 200 nonsurgical initial molar root canal treatments completed by third-year dental students were evaluated. The cases were examined regarding the number of treatment appointments, access cavity preparation, canal taper, canal transportation, perforations, missed canals, presence of ledges, fractured instruments, obturation length, obturation quality, and sealer extrusion. Two independent evaluators determined the number of appointments per case; 4 independent and blinded evaluators analyzed radiographs at 4 treatment stages: preoperative situation, working length, cone fit, and obturation. RESULTS: The following factors were significantly different between the 2 cohorts: the number of appointments, preparation length, taper, and occurrence of ledges. The WaveOne (Dentsply Sirona, York, PA) cohort had a significantly reduced treatment time compared with hand/GT rotary instrumentation (Dentsply Tulsa Dental, Tulsa, OK) (average of 3.3 vs 4.3 appointments). Appropriate length control and adequate taper were significantly more frequent in the WaveOne group. The frequency of ledges was significantly larger in the hybrid group. Other variables, such as access cavity preparation, canal transportation, perforations, missed canals, fractured instruments, obturation quality, and sealer extrusion, were statistically similar between the 2 groups. CONCLUSIONS: NiTi reciprocation instrumentation was superior to hybrid hand/NiTi rotary instrumentation in reducing both patient appointments and the incidence of ledging and in improving obturation length and taper in a dental student clinic setting.


Asunto(s)
Preparación del Conducto Radicular/métodos , Competencia Clínica/normas , Humanos , Calidad de la Atención de Salud , Estudios Retrospectivos , Preparación del Conducto Radicular/instrumentación , Preparación del Conducto Radicular/normas , Estudiantes de Odontología
3.
J Endod ; 44(4): 639-642, 2018 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-29395114

RESUMEN

INTRODUCTION: The aim of this study was to measure the time consumed preparing retrograde cavities in root canals of maxillary molars filled using the GuttaCore (Dentsply Tulsa Dental Specialties, Tulsa, OK) technique and the cold lateral condensation technique (CLC) and to examine the quality of the root-end cavity preparation by ultrasonic tips using micro-computed tomographic (micro-CT) scanning. METHODS: A total of 24 maxillary molars were included; distobuccal and palatal canals were instrumented to size #40 and size #50, respectively. Teeth were randomly distributed into 2 experimental groups; half of the samples were filled with CLC, and half were filled with the GuttaCore technique. After 2 months, the apical 3 mm of each root apex was resected. A retrograde cavity was then prepared 3 mm deep into the root-end-filled canals using ultrasonic tips. The quality of the preparation was first confirmed by a surgical stereomicroscope, and the time required for the root-end preparation was recorded. After root-end cavity preparation, all samples were scanned by micro-CT scanning. RESULTS: There was no significant difference between the palatal and distobuccal canals in the time required to prepare a retrograde cavity. Less time was required in the GuttaCore group to remove all root filling material and finish the cavity preparation than in the CLC group (P < .05), especially in the palatal canals. Micro-CT results confirmed that all material was removed from the root-end cavities and the absence of microcracks. CONCLUSIONS: GuttaCore was removed in less time from root-end cavities than root filling performed with the CLC technique. No damage to the surrounding dentin was detected by micro-CT scanning in the 2 groups.


Asunto(s)
Preparación del Conducto Radicular/métodos , Tratamiento del Conducto Radicular/métodos , Humanos , Maxilar , Diente Molar/cirugía , Calidad de la Atención de Salud , Radiografía Dental , Materiales de Obturación del Conducto Radicular/uso terapéutico , Obturación del Conducto Radicular/métodos , Obturación del Conducto Radicular/normas , Preparación del Conducto Radicular/normas , Tratamiento del Conducto Radicular/normas , Factores de Tiempo , Microtomografía por Rayos X
4.
Med Arch ; 71(3): 204-207, 2017 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28974834

RESUMEN

AIM: The aim of this study was to compare time of preparation and canal aberrations in a simulated root canals after using three different rotary systems: Endostar E5, Endostar E3 and T One File Gold. MATERIALS AND METHODS: A total of 90 endodontic training blocks were used in this study and divided into three groups consisting of 30 each (n = 30). Blocks processing was performed by thirty dentists without any prior experience in rotary instrumentation techniques. In the first group blocks were prepared using Endostar E5, in second one with Endostar E3 and in third one with T One File Gold system. The preparation time was measured. The postoperative image of each block was taken by stereomicroscope and canal aberrations (ledge and instrument fracture) was recorded. Statistical analysis was done by SPSS software. RESULTS: Instrumentation with T One File Gold system is significantly faster compared to instrumentation with Endostar E5 and Endostar E3 systems (p <0.05). There are no statistically significant differences in the type and number of procedural errors between Endostar E5, Endostar E3 and T One File Gold systems when the operators have no previous experience in rotary instrumentation techniques. CONCLUSION: Under the conditions of this study, the incidence of examined canal aberrations were similar for all tested systems. The preparation time was significantly shorter with single file system.


Asunto(s)
Cavidad Pulpar/cirugía , Preparación del Conducto Radicular/normas , Competencia Clínica/normas , Odontólogos/normas , Humanos , Tempo Operativo , Entrenamiento Simulado/métodos
5.
J Dent Educ ; 80(4): 459-65, 2016 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-27037454

RESUMEN

The aim of this prospective quantitative study was to compare the effect of different instructional formats on dental students' skills and knowledge acquisition for access cavity preparation. All first-year dental students were invited to participate in this study conducted during the four consecutive two-week endodontic rotation courses at the University of the Pacific Arthur A. Dugoni School of Dentistry in spring semester 2015. Four alphabetically distributed intact groups of students were randomly allocated to two groups (n=70 each) that participated in either small-group discussion or a traditional lecture on access preparation. The first outcome measure was skill acquisition, measured by the quality of access cavities prepared in extracted teeth at the conclusion of the session. Two blinded raters scored direct observations on a continuous scale. Knowledge, the second outcome measure, was scored with a multiple-choice and open-ended question test at the end of each two-week session. Data were obtained for 134 of the 140 students, for a 96% response rate. The results showed that students in the small-group discussion groups scored significantly higher than those in the lecture groups when skill performance was tested (p=8.9 × 10(-7)). However, no significant differences were found in the acquisition of knowledge between the two groups on the written test. Active student participation was significantly related to improved manual skill acquisition, but the format of the session does not seem to have had a direct influence on acquired knowledge.


Asunto(s)
Competencia Clínica , Educación en Odontología , Evaluación Educacional , Aprendizaje , Estudiantes de Odontología , Enseñanza/métodos , Estudios de Cohortes , Instrucción por Computador , Endodoncia/educación , Femenino , Humanos , Masculino , Destreza Motora/fisiología , Grupo Paritario , Estudios Prospectivos , Distribución Aleatoria , Preparación del Conducto Radicular/métodos , Preparación del Conducto Radicular/normas
7.
Med Sci Monit Basic Res ; 21: 123-30, 2015 Jun 20.
Artículo en Inglés | MEDLINE | ID: mdl-26092929

RESUMEN

BACKGROUND: Complete mechanical preparation of the root canal system is rarely achieved. Therefore, the purpose of this study was to evaluate and compare the root canal shaping efficacy of ProTaper rotary files and standard stainless steel K-files using micro-computed tomography. MATERIAL AND METHODS: Sixty extracted upper second premolars were selected and divided into 2 groups of 30 teeth each. Before preparation, all samples were scanned by micro-computed tomography. Thirty teeth were prepared with the ProTaper system and the other 30 with stainless steel files. After preparation, the untouched surface and root canal straightening were evaluated with micro-computed tomography. The percentage of untouched root canal surface was calculated in the coronal, middle, and apical parts of the canal. We also calculated straightening of the canal after root canal preparation. Results from the 2 groups were statistically compared using the Minitab statistical package. RESULTS: ProTaper rotary files left less untouched root canal surface compared with manual preparation in coronal, middle, and apical sector (p<0.001). Similarly, there was a statistically significant difference in root canal straightening after preparation between the techniques (p<0.001). CONCLUSIONS: Neither manual nor rotary techniques completely prepared the root canal, and both techniques caused slight straightening of the root canal.


Asunto(s)
Instrumentos Dentales , Cavidad Pulpar/diagnóstico por imagen , Preparación del Conducto Radicular/instrumentación , Preparación del Conducto Radicular/métodos , Preparación del Conducto Radicular/normas , Microtomografía por Rayos X/métodos , Diente Premolar/patología , Cavidad Pulpar/cirugía , Humanos
8.
J Contemp Dent Pract ; 15(3): 312-4, 2014 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-25307812

RESUMEN

The objective of this study was to compare, ex vivo, the accuracy of three electronic apex locators (EALs), Root ZX II, Root ZX Mini and RomiApex A-15, in detecting the apical foramen (AF). Forty extracted single-Rooted human teeth with vital pulp were used in this study. After access preparation, the Root canal length of each tooth was measured by placing a #10 file until the tip was visible at the AF under a stereomicroscope. The teeth were subsequently embedded in an alginate model. In each Root canal, all three EALs were used to determine the working length, which was defined as the zero reading or equivalent. The distance between the file tip and AF was measured to an accuracy of 0.01 mm. Results were analyzed using analysis of variance and the Chi-squared test. Root ZX II, Root ZX Mini and RomiApex A-15 were accurate within 0.5 mm, 62.5, 56.2, 50% of the time. No significant differences were found between the three EALs (p > 0.05). Considering all EALs, the mean distance from the file tip to AF was 4.49 mm. The accuracy of the three EALs evaluated in this study was not statistically significantly different. The 'Apex' or '0.0' marks of the EALs do not indicate the AF itself, but just a position coronal 0.49 mm to the AF. Using a tolerance of ± 0.5 mm from the actual lengths, the ZX II yielded the most acceptable measurements.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Odontometría/instrumentación , Preparación del Conducto Radicular/instrumentación , Ápice del Diente/anatomía & histología , Capacidad Eléctrica , Impedancia Eléctrica , Equipos y Suministros Eléctricos , Diseño de Equipo , Humanos , Odontometría/normas , Preparación del Conducto Radicular/normas
9.
J Dent Educ ; 78(10): 1442-50, 2014 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-25281678

RESUMEN

The aim of this study was to demonstrate construct validation of the haptic virtual reality (VR) dental simulator and to define expert benchmarking criteria for skills assessment. Thirty-four self-selected participants (fourteen novices, fourteen intermediates, and six experts in endodontics) at one dental school performed ten repetitions of three mode tasks of endodontic cavity preparation: easy (mandibular premolar with one canal), medium (maxillary premolar with two canals), and hard (mandibular molar with three canals). The virtual instrument's path length was registered by the simulator. The outcomes were assessed by an expert. The error scores in easy and medium modes accurately distinguished the experts from novices and intermediates at the onset of training, when there was a significant difference between groups (ANOVA, p<0.05). The trend was consistent until trial 5. From trial 6 on, the three groups achieved similar scores. No significant difference was found between groups at the end of training. Error score analysis was not able to distinguish any group at the hard level of training. Instrument path length showed a difference in performance according to groups at the onset of training (ANOVA, p<0.05). This study established construct validity for the haptic VR dental simulator by demonstrating its discriminant capabilities between that of experts and non-experts. The experts' error scores and path length were used to define benchmarking criteria for optimal performance.


Asunto(s)
Benchmarking , Competencia Clínica/normas , Educación en Odontología/normas , Materiales de Enseñanza/normas , Interfaz Usuario-Computador , Diente Premolar/anatomía & histología , Simulación por Computador , Cavidad Pulpar/anatomía & histología , Endodoncia/educación , Humanos , Procesamiento de Imagen Asistida por Computador/métodos , Imagen Tridimensional/métodos , Diente Molar/anatomía & histología , Reproducibilidad de los Resultados , Preparación del Conducto Radicular/normas , Estudiantes de Odontología , Enseñanza/métodos , Microtomografía por Rayos X/métodos
10.
Aust Endod J ; 40(3): 123-30, 2014 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-25197021

RESUMEN

The aim of this study was to investigate the technical quality of root canal treatment provided by the undergraduate students as their first experience in molar endodontics using nickel-titanium (NiTi) files in a crown-down approach compared with stainless steel standard technique. This study was carried out by the fifth year undergraduate students attending peer review sessions as a part of their training programme, using two different questionnaires to assess the overall technical quality and potential problems regarding endodontic complications after root canal preparation with these two techniques. The overall results indicated a statistically significant difference in the performance of the two instrument techniques in difficult cases showing better performance of the NiTi system and mean rotary preparation time (P < 0.001). Under the conditions of this study, novice dental students, using NiTi ProTaper rotary files, were able to prepare root canals faster with more preparation accuracy compared with canals of same teeth prepared with hand instruments.


Asunto(s)
Educación en Odontología/normas , Endodoncia/educación , Preparación del Conducto Radicular/normas , Tratamiento del Conducto Radicular/normas , Estudiantes de Odontología , Competencia Clínica/normas , Aleaciones Dentales/química , Cavidad Pulpar/diagnóstico por imagen , Cavidad Pulpar/lesiones , Dentina/diagnóstico por imagen , Diseño de Equipo , Falla de Equipo , Humanos , Diente Molar/diagnóstico por imagen , Níquel/química , Radiografía de Mordida Lateral , Preparación del Conducto Radicular/instrumentación , Preparación del Conducto Radicular/métodos , Rotación , Capa de Barro Dentinario/diagnóstico por imagen , Acero Inoxidable/química , Titanio/química
11.
J Endod ; 40(7): 990-4, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24935550

RESUMEN

INTRODUCTION: The aim of this study was to evaluate the kinematics of 2 reciprocating motors and compare it with manufacturers' declared values. METHODS: VDW Silver (VDW, Munich, Germany) and ATR Tecnika (Tecnika, Pistoia, Italy) were used in the study in 5 working modes: continuous rotation at 400 rpm on VDW Silver and ATR Tecnika and reciprocating motion on ATR Tecnika at 400 rpm and on VDW Silver in Reciproc and WaveOne mode. The polishing disk with an optical target was inserted in the contra-angle and recorded with a 1000-frames per second video camera. The direction and the amount of rotation were analyzed by computer, and the following kinematics parameters were calculated: engaging and disengaging angles, cycle rotational speeds, engaging and disengaging rotational speeds, net cycle angle, total cycle angle, and number of cycles to complete full rotation. One-way analysis of variance followed by planned pair-wise comparisons was used to compare kinematics parameters. The alpha error was set to 0.05. RESULTS: Analysis of variance revealed a difference between actual and set values of all 3 reciprocating modes in all kinematics parameters (P < .001). No significant difference between the actual engaging angle of Reciproc and that of the WaveOne mode was found. For reciprocating motion on the ATR Tecnika at 400 rpm, the actual engaging and disengaging angles were 8- and 9-fold greater, respectively, compared with set angles (P < .001). CONCLUSIONS: The kinematics of reciprocating instrumentation is more complex than it seems as described only with angles and rotational speed. Actual kinematics values differ from manufacturers' declared values.


Asunto(s)
Preparación del Conducto Radicular/instrumentación , Algoritmos , Diseño de Equipo , Humanos , Procesamiento de Imagen Asistida por Computador/métodos , Movimiento (Física) , Preparación del Conducto Radicular/normas , Rotación , Propiedades de Superficie , Grabación en Video/métodos
13.
J Endod ; 40(1): 109-12, 2014 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-24332000

RESUMEN

INTRODUCTION: Electronic working length measurement during root canal treatment in teeth with enlarged apical foramina is a challenge. The aims of this in vitro study were (1) to assess the influence of foramen widening on the accuracy of 5 different electronic foramen locators (EFLs) and (2) to compare the accuracy of EFLs in different foramen sizes. METHODS: The following EFLs were used: MiniApex, Root ZXII, iPex, Propex II, and Elements Apex Locator. Each EFL was used in 3 groups (n = 20) of extracted teeth, with foramen diameters of 0.27 mm (G27), 0.47 mm (G47), and 0.72 mm (G72). Working length was measured according to manufacturer's instructions and compared with visual measurements (control method). Results were classified as accurate (equal or differences ≤ 0.05 mm) or inaccurate (differences > 0.5 mm). RESULTS: In G27, all EFLs yielded accurate findings (intragroup reliability; Fisher exact test, P < .05), compared with only MiniApex, Root ZXII, and Elements Apex Locator in G47 and G72. MiniApex, Root ZXII, and Elements Apex Locator were similarly accurate regardless of foramen size. iPex and Propex II were the least accurate among the devices tested, and foramen diameter influenced their accuracy, with greater diameters yielding poorer EFL performance. CONCLUSIONS: Foramen diameter did not influence the accuracy of MiniApex, Root ZXII, and Elements Apex Locator EFLs. iPex and Propex II showed decreased accuracy as foramen size increased.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Equipos y Suministros Eléctricos/normas , Odontometría/instrumentación , Preparación del Conducto Radicular/instrumentación , Ápice del Diente/anatomía & histología , Calibración , Equipos y Suministros Eléctricos/estadística & datos numéricos , Diseño de Equipo/normas , Humanos , Ensayo de Materiales , Odontometría/normas , Reproducibilidad de los Resultados , Preparación del Conducto Radicular/normas
14.
J Contemp Dent Pract ; 14(4): 629-34, 2013 Jul 01.
Artículo en Inglés | MEDLINE | ID: mdl-24309340

RESUMEN

AIM: This in vitro study is an attempt to compare the effectiveness in cleaning oval shaped root canals using Anatomic Endodontic Technology (AET®), ProFile system® and Manual Instrumentation with K-files. METHODOLOGY: Sixty oval shaped single rooted maxillary and mandibular premolars with straight canals were divided in to three groups. The root canals were, confirmed as being oval shape by means of radiographs made in a buccolingual and mesiodistal direction. Automated canal preparation was performed using Anatomic Endodontic Technology (group 1) and the ProFile system® (group 2). Manual instrumentation (group 3) was performed with k-files. Irrigation was performed using alternatively 3% NaOCl and 17% EDTA, followed by rinsing with normal saline. The roots were split longitudinally into two halves and examined under a scanning electron microscope. The presence of debris and smear layer was recorded at distances 1, 5 and 10 mm from the working length using a three step scoring scale. Mean scores for debris and smear layer was calculated and statistically analyzed for between and within groups significance, using the Kruskal-Wallis nonparametric ANOVA test and Bonferroni's multiple comparison test. RESULTS: At 1, 5 and 10 mm levels the root canals prepared with AET had significantly less surface debris and smear layer on the canal walls as compared to canals prepared with ProFile system® or manual instrumentation. For all three groups significantly lower mean smear layer scores (p < 0.05) were recorded at 5 and 10 mm levels compared with the 1 mm level. Significantly lower mean debris scores (p < 0.05) were also recorded at 5 and 10 mm levels for the AET group whereas no significant differences were found between the three levels for the ProFile system® and manual instrumentation groups. CONCLUSION: Although better instrumentation scores were obtained in canals prepared with AET, complete cleanliness was not achieved with any of the techniques and instruments investigated.


Asunto(s)
Cavidad Pulpar/ultraestructura , Preparación del Conducto Radicular/instrumentación , Diente Premolar/ultraestructura , Dentina/ultraestructura , Ácido Edético/uso terapéutico , Diseño de Equipo , Humanos , Microscopía Electrónica de Rastreo , Irrigantes del Conducto Radicular/uso terapéutico , Preparación del Conducto Radicular/métodos , Preparación del Conducto Radicular/normas , Capa de Barro Dentinario , Cloruro de Sodio/uso terapéutico , Hipoclorito de Sodio/uso terapéutico , Tecnología Odontológica/instrumentación , Tecnología Odontológica/normas
15.
J Contemp Dent Pract ; 14(3): 440-4, 2013 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-24171986

RESUMEN

AIM: To evaluate and compare the efficacy, cleaning ability of hand and two rotary systems in root canal retreatment. METHODOLOGY: Sixty extracted premolars were retreated with following systems: Group -ProTaper Universal retreatment files, Group 2-ProFile system, Group 3-H-file. Specimens were split longitudinally and amount of remaining gutta-percha on the canal walls was assessed using direct visual scoring with the aid of stereomicroscope. Results were statistically analyzed using ANOVA test. RESULTS: Completely clean root canal walls were not achieved with any of the techniques investigated. However, all three systems proved to be effective for gutta-percha removal. Significant difference was found between ProTaper universal retreatment file and H-file, and also between ProFile and H-file. CONCLUSION: Under the conditions of the present study, ProTaper Universal retreatment files left significantly less guttapercha and sealer than ProFile and H-file. CLINICAL SIGNIFICANCE: Rotary systems in combination with gutta-percha solvents can perform superiorly as compared to the time tested traditional hand instrumentation in root canal retreatment.


Asunto(s)
Preparación del Conducto Radicular/normas , Diente Premolar/patología , Ciclohexanoles/uso terapéutico , Cavidad Pulpar/patología , Diseño de Equipo , Eucaliptol , Eucalyptus , Gutapercha/química , Humanos , Monoterpenos/uso terapéutico , Retratamiento , Materiales de Obturación del Conducto Radicular/química , Preparación del Conducto Radicular/instrumentación , Solventes/uso terapéutico , Propiedades de Superficie , Factores de Tiempo , Ápice del Diente/patología , Diente no Vital/terapia , Resultado del Tratamiento
17.
J Endod ; 38(12): 1631-4, 2012 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-23146651

RESUMEN

INTRODUCTION: This study compared canal and isthmus debridement efficacies between side-vented needle irrigation (SNI) and the VPro EndoSafe (VPro) negative-pressure device (Vista Dental, Racine, WI) in mesial roots of mandibular first molars with narrow isthmuses in a closed-canal design. METHODS: Twenty teeth with narrow isthmuses were selected using micro-computed tomography scanning. Collagen solution was reconstituted with 1% NH(4)OH to simulate debris and injected into canals via vacuum. Canals were instrumented to size 40/.04. Final irrigation was performed with 17% EDTA and 6% NaOCl using SNI with a 30-G needle or the VPro system. Roots were demineralized, and Masson trichrome-stained sections were prepared at 1.2 to 3.2 mm from the anatomic apex for a total of 6 canal levels. Debris-filled areas within the canals and isthmuses were measured using ImageJ software (National Institutes of Health, Bethesda, MD) and statistically analyzed using repeated-measures analysis. RESULTS: There was no significant difference between techniques and debridement efficacy among the 6 levels within the canal (P = .108). The debridement efficacy at 1.6 mm differed significantly from that at 3.2 mm. VPro had significantly more debris at isthmus levels 2.0 and 2.4 mm than SNI (P = .009). A significant difference was observed between the canal and the isthmus (P < .001). Neither VPro nor SNI removed debris completely from the apical third or isthmus. CONCLUSIONS: VPro EndoSafe did not differ significantly from SNI in the overall debridement efficacy in the apical third of mesial roots of mandibular first molars.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Irrigantes del Conducto Radicular/administración & dosificación , Preparación del Conducto Radicular/normas , Irrigación Terapéutica/instrumentación , Compuestos Azo , Colágeno , Colorantes , Desbridamiento , Ácido Edético/administración & dosificación , Eosina Amarillenta-(YS) , Diseño de Equipo , Humanos , Ensayo de Materiales , Verde de Metilo , Diente Molar/anatomía & histología , Agujas , Presión , Preparación del Conducto Radicular/instrumentación , Capa de Barro Dentinario , Hipoclorito de Sodio/administración & dosificación , Ápice del Diente/anatomía & histología , Raíz del Diente/anatomía & histología , Microtomografía por Rayos X
18.
BMC Oral Health ; 12: 42, 2012 Oct 15.
Artículo en Inglés | MEDLINE | ID: mdl-23066650

RESUMEN

BACKGROUND: Previous reports indicate that worldwide, the technical quality of root canal fillings is poor. There are few reports from sub-Saharan Africa and none yet from Nigeria where most patients access treatment from non-specialists especially at general dental clinics. The aim of this study was to evaluate the technical quality of root canal fillings done in a general dental clinic with emphasis on the effects of professional experience of the operator, whether tooth was anterior or posterior and whether it was a maxillary or mandibular tooth. METHODS: Retrospective study of case notes and periapical radiographs of patients with completed root canal fillings seen between 2008 and 2011. Inclusion criteria included cases of primary treatment with available case notes, good quality pre-operative and post-operative periapical radiographs. Technical quality that was assessed was root canal length and homogeneity. Root canal fillings were classified either as Good Quality Endodontic Work (GQEW) or Non- Good Quality Endodontic Work (NGQEW). RESULTS: Fifty-one patients aged between 8 and 54 years (mean 28) fulfilled the inclusion criteria for this study. From these, there were 62 root filled teeth giving a ratio of 1.2 root canal filled teeth per person. There were acceptable length of root canal fillings in 71% of teeth, 58.1% were homogeneous while 53.2% were GQEW. There was no statistically significant difference in whether tooth was root filled by junior or senior dentist (p=0.43), anterior or posterior (p=0.11). There was significant association between GQEW and maxillary teeth (p=0.03). CONCLUSION: This study showed that the overall technical quality of root canal fillings done by non-specialists was better than earlier reports but lower than that done by endodontists. Since many patients receive treatment from non-specialists in developing countries, it is necessary to improve technical quality of root canal fillings done in general dental clinics. These could be through improvement in the quality of undergraduate training and more post graduate continuing education courses for skills update.


Asunto(s)
Odontología General/normas , Obturación del Conducto Radicular/normas , Adolescente , Adulto , Diente Premolar/diagnóstico por imagen , Niño , Competencia Clínica , Diente Canino/diagnóstico por imagen , Clínicas Odontológicas , Cavidad Pulpar/diagnóstico por imagen , Femenino , Gutapercha/química , Humanos , Incisivo/diagnóstico por imagen , Masculino , Mandíbula , Maxilar , Persona de Mediana Edad , Diente Molar/diagnóstico por imagen , Nigeria , Calidad de la Atención de Salud/normas , Radiografía de Mordida Lateral , Estudios Retrospectivos , Materiales de Obturación del Conducto Radicular/química , Preparación del Conducto Radicular/normas , Ápice del Diente/diagnóstico por imagen , Adulto Joven
19.
J Endod ; 38(8): 1121-5, 2012 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-22794219

RESUMEN

INTRODUCTION: EndoSequence and Vortex are 2 recently developed rotary file systems that are made with traditional nickel-titanium (NiTi) and M-Wire technology, respectively. Previous studies have demonstrated better fatigue resistance of M-Wire rotary files compared with the conventional NiTi file. However, no study has compared the effects of M-Wire and conventional NiTi on transportation and centering ability. Hence, the aim of this study was to evaluate the transportation and centering ability of EndoSequence and Vortex files in mesial roots of mandibular molars by using micro-computed tomography imaging. METHODS: Sixteen extracted mandibular molars with mesiobuccal and mesiolingual canals with separate foramina were used. Preinstrumentation scans of all teeth were taken, and the teeth were divided into 2 groups. In group 1, the mesiobuccal canals were instrumented with Vortex files and the mesiolingual canals with EndoSequence files. In group 2, the mesiobuccal canals were instrumented with EndoSequence files and the mesiolingual canals with Vortex files. Two file sizes were compared, 30/.04 and 40/.04. Postinstrumentation scans were performed, and the 2 scans were compared to determine centering ability and transportation. RESULTS: The amount of transportation at 1, 3, and 5 mm was similar for both file types in both file sizes. Transportation toward the furcation area at 7 mm was greater with the 30/.04 Endosequence files compared with the Vortex 30/.04 files (P < .05), but there was no difference in size 40/.04 files. CONCLUSIONS: Overall, our study does not support the use of one rotary file system over the other (Vortex or EndoSequence) when comparing transportation and centering ability.


Asunto(s)
Cavidad Pulpar/anatomía & histología , Preparación del Conducto Radicular/instrumentación , Aleaciones Dentales/química , Diseño de Equipo , Humanos , Ensayo de Materiales , Diente Molar/anatomía & histología , Níquel/química , Preparación del Conducto Radicular/métodos , Preparación del Conducto Radicular/normas , Rotación , Estrés Mecánico , Propiedades de Superficie , Titanio/química , Ápice del Diente/anatomía & histología , Raíz del Diente/anatomía & histología , Microtomografía por Rayos X
20.
Odontology ; 100(2): 130-6, 2012 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-22527909

RESUMEN

Nickel-titanium (NiTi) root canal instruments have improved the technical quality of enlarging and shaping. These instruments have been shown to prepare even severely curved root canal with fewer procedural errors than traditional stainless steel hand instruments. While it would appear that these instruments might enhance clinical outcomes, very few studies have assessed their impact when used in primary root canal treatment. Clinical studies investigating the outcome of primary root canal treatment using nickel-titanium hand or rotary instruments were identified (MEDLINE database) using appropriate key words in an attempt to determine if there have been enhanced outcomes with these instruments. Evidence from one clinical trial suggests that (i) better maintenance of the original canal curvature and shape results in increased success rates and (ii) that ledging of root canals results in reduced success rates. Evidence from two studies indicates that the use of NiTi-either hand or rotary-instruments significantly increases success rates of primary nonsurgical root canal treatment compared with the use of stainless steel hand instruments, while three investigations failed to show any significant differences.


Asunto(s)
Aleaciones Dentales/química , Cavidad Pulpar/patología , Níquel/química , Preparación del Conducto Radicular/instrumentación , Titanio/química , Diseño de Equipo , Humanos , Recurrencia , Preparación del Conducto Radicular/normas , Tratamiento del Conducto Radicular/normas , Acero Inoxidable/química , Resultado del Tratamiento
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA