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1.
Braz Dent J ; 31(4): 353-359, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32901709

RESUMEN

The aim of this prospective, randomized, clinical study was to analyze the influence of occlusal adjustment on the prevalence of postoperative pain after endodontic treatment. Seventy-eight patients, diagnosed with symptomatic irreversible pulpitis with indication for endodontic treatment, were selected to participate in the study. The participants were randomized and divided into two groups: in the occlusal adjustment group (OAG), endodontic treatment was performed with subsequent occlusal adjustment. In the control group (CG), endodontic treatment was performed without occlusal adjustment. Treatments were performed by the same operator. Pain occurrence and intensity were recorded on two scales: the verbal rating scale (VRS) and numerical rating scale (NRS). Pain assessment was carried out by a second examiner, blinded to the experiment, 6, 24 and 72 h after endodontic treatment. Data were analyzed using Mann-Whitney, chi-squared, and Fisher's exact tests. In the occlusal adjustment group, 71.1% reported postoperative pain and 67.5% reported pain in the control group. At the 6-hour assessment, 21 individuals reported pain in the occlusal adjustment group and 24 in the control group (p=0.672). At the 24-hour assessment, 18 and 19 individuals reported pain (p=0.991) and at the 72-hour assessment, 8 and 4 reported pain (p=0.219), respectively. Occlusal adjustment did not influence the prevalence of postoperative pain of endodontically treated teeth with symptomatic irreversible pulpitis.


Asunto(s)
Cavidad Pulpar , Tratamiento del Conducto Radicular , Humanos , Ajuste Oclusal , Dolor Postoperatorio , Estudios Prospectivos
2.
Braz Dent J ; 31(4): 404-408, 2020 Sep 04.
Artículo en Inglés | MEDLINE | ID: mdl-32901717

RESUMEN

The aim of this study was to evaluate the influence of different coronal preflaring protocols (absent, conservative and conventional) on the accuracy of Root ZX II, Raypex 6, and RomiApex A-15 electronic foramen locators (EFLs). Twenty mandibular molars with Vertucci's type IV mesial roots were subjected to endodontic exploration and foraminal patency confirmation. Under 16x magnification, its real lengths (RL) were measured and registered (RL1). The canals were then irrigated with 2.5% sodium hypochlorite and electronically measured (EM1) employing the alginate model; all measurements were performed in triplicate by a blind operator using adjusted endodontic hand-files introduced until the apex foramen. Coronal preflaring procedures were sequentially performed with #25/.06 (conservative) and #25/.12 (conventional) instruments; new RLs extents were performed after each coronal preparation protocol (RL2/RL3), as same as electronic measurements (EM2/EM3). The devices error (mm) was evaluated considering the difference between RLs and EMs at each preparation stage; their precision was stablished adopting ±0.5 mm as tolerance margin. The EFLs error significantly reduced after conventional coronal preflaring protocol (p<0.05), which not occur after the conservative one. The best precisions values were noted after conventional preparation as 90% (Root ZX II), 97.5% (Raypex 6), and 92.5% (RomiApex A-15). No significant differences were found in EFLs comparisons, regardless of the coronal protocol tested (p>0.05). Under the conditions tested it can be concluded that the EFLs evaluated were precise. Moreover, the preflaring protocols influences its accuracy's, where the less conservative one produced the best results.


Asunto(s)
Preparación del Conducto Radicular , Ápice del Diente , Cavidad Pulpar , Electrónica , Odontometría
3.
Eur J Paediatr Dent ; 21(3): 238-242, 2020 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-32893659

RESUMEN

BACKGROUND: Molar Incisor Malformation (MIM) or Molar Root Incisor malformation (MRIM) is a recently discovered root malformation with constricted pulp and abnormally located furcation presented in permanent first molars and sometimes incisors. CASE REPORT: Two cases that feature MIM are presented with the description of the characteristic tooth form, clinical/radiographic examination, medical history, the supposed aetiology, treatment procedure and results at the 2-year follow-up. Conservative endodontic treatment was performed in both cases, furcation perforation and canal perforation were filled with MTA (Mineral Trioxide Aggregate), and a good prognosis was observed after 2 years of follow-up. Furthermore, recommended treatment options are discussed to provide a more appropriate treatment for the patients. CONCLUSION: Patients with MIM need to be treated at the right time to avoid severe infection and other problems. Early diagnosis with appropriate treatment is more likely to lead to a more favourable prognosis.


Asunto(s)
Incisivo , Materiales de Obturación del Conducto Radicular , Compuestos de Aluminio , Compuestos de Calcio , Pulpa Dental , Cavidad Pulpar , Combinación de Medicamentos , Humanos , Diente Molar , Óxidos , Silicatos , Raíz del Diente
4.
Indian J Dent Res ; 31(3): 475-480, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32769286

RESUMEN

Objectives: To evaluate the effect of different intraradicular posts on the dimensions of computed tomography (CT) images in cone-beam and fan-beam equipment. Materials and Methods: : A total of 15 root canals of bovine teeth were instrumented up to a file #50 and root-filled by the active lateral condensation technique. The teeth were randomly divided into three groups, according to the type of intraradicular post: 1) tight fiberglass post; 2) anatomical fiberglass post; and 3) metal post. The root canals were desobturated in 10 mm and tomographic images were acquired in two devices, a cone-beam and fan-beam equipment. Then, the intraradicular posts were cemented using an automix self-conditioning and self-adhesive resin cement, and the final acquisitions of the CT images were performed for analysis. The diameter of the canal was compared before and after cementation of the intraradicular posts. The t-test was used between the initial and final measurements of each tomograph and also between the cone-beam and fan-beam tomographs (α = 0.05). Results: The anatomical fiberglass post presented the smallest dimensional change among the initial and final measurements, followed by the tight fiberglass post, with the metal post being the material that showed the most considerable dimensional difference in the cone-beam. Conclusion: All of the intraradicular posts used promoted a change in the size of the CT image. The fan-beam scanner promoted greater dimensional change in the images.


Asunto(s)
Técnica de Perno Muñón , Animales , Bovinos , Cementación , Tomografía Computarizada de Haz Cónico , Cavidad Pulpar , Cementos de Resina , Tratamiento del Conducto Radicular
5.
Stomatologiia (Mosk) ; 99(4): 15-20, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-32692514

RESUMEN

The study was aimed to conduct a morphological assessment of the influence exerted by a certain method of activation of endodontic rinsing liquid on the root dentin structure and canal cleaning effectiveness in an ex vivo experiment. The study was performed on 20 single-rooted teeth removed due to complicated caries in people aged 25-44 years. A devised method of vacuum-jet irrigation was used to carry out the final antiseptic treatment and to activate a rinsing liquid in the group No. 1 (n=10), and an endodontic syringe with ultrasonic activation was used in the group No. 2 (n=10). Optical and scanning electron microscopy data were used to assess dentin histostructure, presence or absence of organic inclusions in the root canal lumens, quality of preparation and contour lines of their sides. An analysis of scans demonstrates that the vacuum-jet irrigation method effectively cleans the root canal lumen in the apical area in 90% of the cases, while irrigation with an endodontic syringe and ultrasound activation has been effective in 67% of the cases. The smear layer throughout the root canals in the samples of the group No. 1 was removed in 100% of the cases. At the same time, the smear layer in the canal apical area was not completely removed in either of the samples of the group No. 2. An analysis of photomicrographs of histotopographic cross sections of the dental roots in group No. 2 under consideration revealed numerous cavities in the circumpulpal dentin, which form nidi of destruction up to 10-15 mcr in diameter merging in the cervical and middle third of the root. At the same time, a typical structure of the circumpulpal dentin with a well-developed network of dentinal tubules and intact peritubular and intertubular matrix was observed throughout the dental roots in the samples of the group No. 1. These investigational studies allow us to conclude that vacuum-jet irrigation of root canals provides better cleaning, completely removes the smear layer and does not damage the root dentin structure.


Asunto(s)
Cavidad Pulpar , Capa de Barro Dentinario , Adulto , Dentina , Ácido Edético , Humanos , Microscopía Electrónica de Rastreo , Irrigantes del Conducto Radicular , Preparación del Conducto Radicular , Hipoclorito de Sodio
6.
Acta Odontol Latinoam ; 33(1): 33-37, 2020 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-32621597

RESUMEN

This study evaluated the internal morphology of lower incisors using computerized microtomography (micro-CT) images. Eighty-nine lower incisors were scanned by micro-CT and reconstructed with NRecon software. 2D parameters (perimeter, root length, circularity and canal diameter) and 3D parameters (volume, surface area and structure model index) were evaluated with CTAn and CTVol software. The results are presented descriptively. It was found that 89.9% of the canals had a single main root canal (type I), followed by type II (6.7%) and III (3.4%), while 5.6% of the specimens presented lateral canals and 1.1% had an apical delta. Mean volume and surface area were 31.80mm³ and 90.58mm², respectively. The most prevalent shape of the root canal at CEJ level was circular (41.6%) and 1mm from the apex, 73% of the samples were classified as oval. Lower incisors with internal anatomical variations may offer a high degree of technical complexity and may result in treatment failure.


Asunto(s)
Cavidad Pulpar/diagnóstico por imagen , Incisivo/anatomía & histología , Mandíbula , Microtomografía por Rayos X/métodos , Humanos , Procesamiento de Imagen Asistido por Computador , Incisivo/diagnóstico por imagen
7.
Shanghai Kou Qiang Yi Xue ; 29(2): 146-149, 2020 Apr.
Artículo en Chino | MEDLINE | ID: mdl-32626876

RESUMEN

PURSPOSE: To compare the shaping ability and dental cracks of Twisted File and S3 in severely curved molar root canal preparation. METHODS: Sixty extracted mandibular molars with mesiobuccal canals (canal curvature angles beyond 25°) were selected and divided randomly into 2 groups with 30 canals in each group. The canals were scanned by cone-beam CT(CBCT) before and after root canal preparation .The canal transportation was recorded at 3 points (3, 5, 7 mm to root tip). After root canal preparation,all the roots were horizontally sectioned 3,5 and 7mm from the apex. The slices were observed under optical stereomicroscope. SPSS 19.0 software package was used for statistical analysis. RESULTS: Transportations occurred in all groups. No significant difference was found between the two groups of canal transportation at the two points (5 mm and 7 mm to root tip) (P>0.05); at the point of 3 mm to the root tip,the transportation of canals prepared by S3 was obviously lesser than the canals prepared by TF. There was no significant difference in the incidence of dentinal cracks between the two groups (P>0.05). CONCLUSIONS: Under the conditions of severely curved molar root canal in extracted teeth, cracks were found in both groups, S3 was found to be better in maintaining original canal shape than TF system.


Asunto(s)
Níquel , Preparación del Conducto Radicular , Aleaciones Dentales , Instrumentos Dentales , Cavidad Pulpar , Diseño de Equipo , Diente Molar , Titanio
8.
J Contemp Dent Pract ; 21(5): 490-493, 2020 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-32690829

RESUMEN

AIM: The aim of this study is to compare the effect of different root canal sealers on the fracture resistance of endodontically treated teeth using AH Plus, GuttaFlow 2, MTA-Fillapex, and TotalFill® BC™ sealers. MATERIALS AND METHODS: Sixty single-rooted mandibular premolar teeth were used in the study. After the decoronation of the crowns of the teeth, we got a 13 mm root length. All samples instrumented using ProTaper Next system reaching file size ×4 as the final master apical file. Gutta-percha (GP) with single cone as obturation technique was carried out to all experimental teeth. Then, the teeth were divided into five groups (n = 12) based on the type of sealer to be used. Group I: AH Plus sealer + GP, Group II: GuttaFlow 2 sealer + GP, Group III: MTA-Fillapex sealer + GP, Group IV: TotalFill BC sealer + GP, and Group V: control (instrumented but unobturated teeth). Embedding all teeth in acrylic resin blocks was carried out and fracture force was measured using a universal testing machine (Instron Corp., Canton, MA, USA) by using metal-like spreader tip on 0.5 mm/m speed. Then, the data were statistically evaluated using one-way analysis of variance (ANOVA) and post hoc test (Tukey's test). RESULTS: Group IV showed higher resistance to fracture than other groups significantly. There was a nonsignificant difference in fracture force between Group I, Group II, and Group III. Group V showed the least fracture resistance than other groups. CONCLUSION: Based on this in vitro study, TotalFill bioceramic-based sealer was more effective when compared with other sealers and the unobturated group showed the lowest mean fracture resistance. CLINICAL SIGNIFICANCE: The use of bioceramic sealer with BC cones enhanced the fracture resistance of endodontically treated teeth.


Asunto(s)
Materiales de Obturación del Conducto Radicular , Diente no Vital , Cavidad Pulpar , Resinas Epoxi , Gutapercha , Humanos , Obturación del Conducto Radicular
9.
J Contemp Dent Pract ; 21(5): 515-520, 2020 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-32690833

RESUMEN

AIM: To evaluate in vitro effect of apical root canal perforation size on push-out bond strength of glass fiber dowels cemented to sound or perforated root canals using two different adhesive systems. MATERIALS AND METHODS: A total of 120 human-extracted intact upper central incisors were selected. Teeth were sectioned 3 mm coronal to cement enamel junction, and the remaining root received endodontic root canal therapy. The roots were divided into two experimental groups according to the root condition: either sound (n = 40) or apically perforated (n = 80). Dowel spaces were prepared for all specimens to a depth of 10 mm. Roots were restored with glass fiber dowels. The experimental group was further subdivided into four subgroups (n = 20) according to the adhesive system used and apical perforation size: group I, perforated root 2 mm apically, dowel cemented using total-etch adhesive cement; group II, perforated root 2 mm apically, dowel cemented using self-etch adhesive cement; group III, perforated root 4 mm apically, dowel cemented using total-etch adhesive cement; and group IV, perforated root 4 mm apically, dowel cemented using self-etch adhesive cement. The control group, sound root, was divided into two subgroups: group I, sound root, dowel cemented using total-etch adhesive cement, and group II, sound root, dowel cemented using self-etch or total-etch adhesive cement. Each root was then cut horizontally, and root segments were prepared to be tested. The bond strength between dowel and dentin was measured with universal testing machine using a push-out test. The two-way analysis of variance (ANOVA) was used to analyze the data and post hoc Tukey's test (α = 0.05). RESULTS: Root canal perforation and the type of adhesive system used resulted in significant differences in push-out bond strength (p < 0.05). Regardless of root canal perforation size, glass fiber dowels in normal root canals had significantly higher mean bond strength values (9.2 ± 1.4 MPa) compared with perforated root canals (6.1 ± 1.4 MPa). Also, self-etch protocol had significantly higher mean bond strength values (9.1 ± 1.3 MPa) compared with total-etch protocol (6.2 ± 2.1 MPa). CONCLUSION: The apical root perforation size caused a direct effect on the bond strength of the glass fiber dowels cemented to dentin by reducing the bond strength values to the root dentin regardless of the adhesive system used. CLINICAL SIGNIFICANCE: Prior to perforation repair, dentist or endodontist should evaluate the perforation size to predict the treatment outcome.


Asunto(s)
Recubrimiento Dental Adhesivo , Técnica de Perno Muñón , Cavidad Pulpar , Dentina , Vidrio , Humanos , Ensayo de Materiales , Cementos de Resina , Tratamiento del Conducto Radicular
10.
J Contemp Dent Pract ; 21(5): 539-542, 2020 May 01.
Artículo en Inglés | MEDLINE | ID: mdl-32690836

RESUMEN

AIM: The aim of the present study was to investigate the role of the flat design compared with a non-flat designed instrument on the centering ability in a simulated root canal system. MATERIALS AND METHODS: Two file systems were chosen: the F-One (Fanta Dental, Shanghai, China) and a prototype with the same design but without the flat-side design. A total of 50 simulated L-shaped root canals in resin blocks were shaped with a new instrument each. Pre- and postcanal preparation images were captured and superimposed to measure and compare the canal transportation and evaluate the centering ability of each file. The t test was performed and the level of significance was set at p < 0.05. RESULTS: Prototype files removed significantly less resin from the inner and the outer parts of the canal and showed significantly higher mean transportation values. CONCLUSION: It can be concluded that the F-One file system demonstrated better shaping ability compared with the prototype file system in L-shaped resin-simulated canals. CLINICAL RELEVANCE: The present study showed the safety of the flat-side design, minimizing the risk of iatrogenic errors such as ledging, perforation, or zipping of the root canal.


Asunto(s)
Níquel , Titanio , China , Aleaciones Dentales , Instrumentos Dentales , Cavidad Pulpar , Diseño de Equipo , Preparación del Conducto Radicular
11.
J Clin Pediatr Dent ; 44(3): 174-179, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32644890

RESUMEN

Objective: The aim of the present study was to evaluate the reduction in bacterial loading using Papacarie and Carisolv as an irrigating solution in pulpectomized primary molars. Study design: A controlled, randomized clinical trial involving 120 necrotic canals from both genders between 3 and 7 years old children were included, 30 irrigated with Papacarie [ group I], Carisolv [ group II], 1% NaOCl gel [ group III] and 1% Na0Cl solution [group IV ] each; in all cases, 2 microbiological samples from within the canals were taken with sterile paper points, the first after the canal opening and before the first irrigation, and the second after instrumentation and final irrigation, before obturation. All samples were evaluated by Agar plate method. Results: The results were statistically analyzed by ANOVA. After analyzing samples before and after irrigation in all the groups, a strong significant decrease in bacterial load [ p = < 0.001 ] was found with Papacarie and Carisolv. Conclusion: Papacarie and Carisolv can be suggested as an alternative irrigant for pulpectomy of necrotic teeth.


Asunto(s)
Diente Molar , Irrigantes del Conducto Radicular , Niño , Preescolar , Cavidad Pulpar , Femenino , Ácido Glutámico , Humanos , Leucina , Lisina , Masculino , Papaína , Preparación del Conducto Radicular , Hipoclorito de Sodio
12.
J Adhes Dent ; 22(4): 353-363, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32666061

RESUMEN

PURPOSE: To evaluate the influence of type and viscosity of composite resins used for root reinforcement in the adhesion of glass-fiber posts to flared root canals. MATERIALS AND METHODS: The crowns of 78 uniradicular permanent teeth were removed and the teeth were endodontically treated. After one week, the roots were prepared for root reinforcement and randomly divided into 6 groups (n = 13): positive control group ([PCG] the root canals were not enlarged), negative control group ([NCG] root canals were enlarged, no reinforcement), and in the remaining 4 groups, root canals were enlarged to receive root reinforcement according to a combination of the factors composite resin type (bulk-fill or conventional) and viscosity (flowable or regular). After fiber post cementation, six slices were obtained from each root (2 each from the cervical, middle, and apical thirds). For each group, 7 teeth underwent push-out bond strength testing, and 6 teeth were evaluated for nanoleakage and Vickers microhardness. Bond strength and nanoleakage data were submitted to two-way ANOVA and Tukey's test (α = 0.05), and microhardness data to one-way ANOVA and Tukey's test (α = 0.05). RESULTS: The root reinforcement groups with regular and flowable bulk-fill composite resins showed statistically superior adhesion results (higher bond strength and less nanoleakage) compared to the negative control in all root regions. Microhardness values were higher in the cervical third followed by the middle third. CONCLUSION: Regular or flowable bulk-fill composite resins should be chosen for root reinforcement of flared root canals prior to fiber post cementation.


Asunto(s)
Recubrimiento Dental Adhesivo , Técnica de Perno Muñón , Resinas Compuestas , Cavidad Pulpar , Análisis del Estrés Dental , Vidrio , Ensayo de Materiales , Cementos de Resina
13.
Orv Hetil ; 161(30): 1260-1265, 2020 07.
Artículo en Húngaro | MEDLINE | ID: mdl-32653869

RESUMEN

Surgical guides and three-dimensional (3D) planning softwares used in everyday dental implantology open new possibilities in other fields of dentistry. While using the operation microscope in endodontic microsurgery provides more precise apicectomy, there is still no consent on the exact localisation and size of the bony window to be prepared for this surgery. Our aim is to describe a new, guided endodontic microsurgery method when osteotomy and apicectomy are planned in a 3D software and performed with a trephine bur. Based on data from Cone Beam Computed Tomography, planning of the surgical guide was performed with a 3D planning software (Smart Guide, dicomLAB, Hungary) in order to define the size of the bony window, the angulation and the depth of the trephine bur during the apicectomy. After preparing a mucoperiosteal flap, with the help of the dentally supported surgical guide, the trephine bur removes the cortical bone and the apex of the root simultaniously. Following the modern microsurgical protocol, after performing the ultrasonic retrograde preparation, mineral trioxide aggregate (ProRoot MTA; Dentsply Maillefer, Ballaigues, Switzerland) is placed as a retrograde filling to close the resected area. After the uneventful healing period, a complete bony regeneration can be seen on the 1-year follow up X-ray. The patient is symptom-free. This technique is considered to be faster and more precise than the non-guided endodontic microsurgery carried out without the utilization of a trephine bur. Orv Hetil. 2020; 161(30): 1260-1265.


Asunto(s)
Apicectomía/métodos , Tomografía Computarizada de Haz Cónico/métodos , Cavidad Pulpar/cirugía , Endodoncia/métodos , Microcirugia/métodos , Osteotomía/métodos , Impresión Tridimensional , Materiales de Obturación del Conducto Radicular , Tratamiento del Conducto Radicular/métodos , Compuestos de Aluminio , Compuestos de Calcio , Cavidad Pulpar/diagnóstico por imagen , Combinación de Medicamentos , Humanos , Hungría , Óxidos , Radiografía Dental , Silicatos , Diente , Resultado del Tratamiento , Procedimientos Quirúrgicos Ultrasónicos
14.
Braz Dent J ; 31(3): 201-220, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32667513

RESUMEN

The effect of root canal preparation technique on microcrack initiation is a controversial issue. This systematic review aimed to assess the role of root canal preparation techniques with different kinematics (manual, rotary, reciprocating, adaptive, self-adjusting file) on microcrack initiation. In vitro and in situ studies comparing the influence of at least two different root canal preparation techniques on the initiation of dentin microcracks were searched in PubMed/MEDLINE and SCOPUS up to June 5, 2018 without language and period restriction. Two authors independently reviewed all identified titles and abstracts for eligibility. Tables were generated to summarize the included studies, and the included studies were assessed for bias. Fifty-four (n=54) articles met the eligibility criteria. The results were classified according to the method used for microcrack evaluation, and most studies that used micro-computed tomography showed no formation of new cracks after root canal preparation. In general, the instrumentation techniques induced microcrack formation when the methods were destructive, irrespective of kinematics. In relation to the apex region, when the preparation working length was set as the root canal length subtracted of 1 mm, the risk of microcrack initiation reduces. The majority of the included studies had low risk of bias for all assessed domains. Our results seem to indicate that the various root canal preparation techniques considered in this study will not cause damage to the dental structure when adequately employed and the proper methodology is applied.


Asunto(s)
Dentina , Preparación del Conducto Radicular , Cavidad Pulpar , Microtomografía por Rayos X
15.
Braz Dent J ; 31(3): 236-243, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32667516

RESUMEN

This study aimed to quantify the penetration of hydrogen peroxide, color change evaluation, surface morphology, and composition after application of desensitizing agents before in-office bleaching. Fifty premolars were sectioned, an acetate buffer was placed in the pulp chamber and divided into five groups (n=10). In the positive control group, only the in-office bleaching gel was used, and in the negative control group, no treatment was used. Three different desensitizing agents were applied: Desensibilize KF2%® group; Mi Paste® group, and Desensibilize Nano-P® group. The bleaching procedure was carried out with 35% HP. The absorbance of the resulting solution was determined in a spectrophotometer. Color change was assessed by using a digital spectrophotometer. Four additional premolars were assigned to the same groups above for analysis under scanning electron microscope, as well as to evaluate the elemental composition with X-ray dispersive energy spectrometry. Data were subjected to ANOVA and Tukey's test (α=0.05). All products reduced the penetration of HP in the pulp chamber. Mi Paste and Nano P were the products that yielded the lowest HP penetration, which was similar to the negative control group (p<0.001). No significant difference was detected in color change (p<0.001). Concerning enamel morphology, the groups that were analyzed after bleaching were observed a greater deposition of desensitizing agents on the surface. The use of desensitizing agents before tooth bleaching seems to be an alternative to reduce adverse effects of the tooth.


Asunto(s)
Blanqueadores Dentales , Blanqueamiento de Dientes , Esmalte Dental , Cavidad Pulpar , Peróxido de Hidrógeno
16.
Braz Dent J ; 31(3): 272-280, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32667522

RESUMEN

The purpose of this study was to evaluate the influence of the application mode of three universal adhesive systems on interfacial physical properties of indirect composite restorations adhesively cemented to dentin cavities. Seventy-eight bovine lower incisors were selected and a slice of dentin (thickness: 2 mm) between the buccal surface and pulp chamber was obtained for each tooth. Conical cavities were made on this surface. The internal walls of the cavities were then coated with a hydrophilic gel, filled with composite resin and photopolymerized. The dentin/cone sets were divided into 6 groups (n=10) according to type of universal adhesive (TETRI: Tetric N Bond, FUT: Futura Bond U, SBU: Single Bond Universal) and acid etching on dentin (A: with acid etching; WA: without acid etching). The acid etching and the adhesive systems were applied to the surface of the dentin. All composite resin cones were sandblasted (Al2O3, 20 s) and silanized. After surface treatment, the cones were cemented (RelyX Ultimate) into the dentin cavity and photopolymerized. After thermocycling (10,000 cycles), samples were submitted to marginal adaptation analysis (using caries detector dye), push-out test (0.5 mm/min), and failure mode analysis. Additional samples were prepared for nanoleakage analysis (SEM). The data (MPa) were analyzed by two-way ANOVA and Tukey's post-test (5%). The groups in which the dentin was acid etched showed significantly lower bond strength values in the push-out test (p<0.01). Dentin acid etching significantly reduced the bond strength between universal adhesive systems and dentin in indirect restorative procedures.


Asunto(s)
Recubrimiento Dental Adhesivo , Recubrimientos Dentinarios , Animales , Bovinos , Resinas Compuestas , Cementos Dentales , Cavidad Pulpar , Dentina , Ensayo de Materiales , Cementos de Resina , Propiedades de Superficie , Resistencia a la Tracción
17.
J Indian Soc Pedod Prev Dent ; 38(2): 158-163, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32611862

RESUMEN

Background: Accurate root canal length determination, simplicity of the procedure, and patient's cooperation are important determinants in the success of endodontic treatment in primary teeth. Aim: The aim of the study was to clinically compare the accuracy of Propex Pixi and Formatron D10 apex locators with conventional radiography in determining working length in mandibular primary second molars with and without varying degrees of physiological root resorption. Design: A nonrandomized clinical trial was conducted in 115 mandibular primary second molars indicated for pulpectomy in 90 pediatric dental patients. A single calibrated examiner determined the working length by conventional radiographic method and electronic apex locator (EAL) methods in a total of 376 canals. Behavior of the children during execution of each method in each tooth was recorded using the Frankl's behavior rating scale. The data obtained were tabulated and subjected to statistical analysis. Results: Significant correlation (intraclass correlation = 0.80 and 0.81, P < 0.001) could be detected between working length measurements obtained using Propex Pixi and Formatron D10 and measurements obtained using conventional radiography. Higher percentage of negative behaviors (negative and definitely negative) was observed during the conventional radiographic method (68.6%) as opposed to the Propex Pixi (16.5%) and Formatron D10 (20.8%) methods. Conclusions: Both the apex locators were as accurate as conventional radiography in determining working length in primary teeth; Formatron D10 being more accurate than Propex Pixi. The EALs were far better accepted by children than conventional radiography.


Asunto(s)
Cavidad Pulpar , Ápice del Diente , Niño , Humanos , Diente Molar , Odontometría , Radiografía , Preparación del Conducto Radicular , Diente Primario
18.
J Indian Soc Pedod Prev Dent ; 38(2): 164-170, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32611863

RESUMEN

Aim: Sodium hypochlorite, though considered an ideal root canal irrigant, cannot be used at required concentrations in children, due to its undesirable effects. Hence, it is imperative to search for an ideal root canal irrigant to avoid these undesirable effects which we hope to achieve with this study. The antimicrobial efficacy of aqueous ozone, green tea, and normal saline as irrigants in pulpectomy procedures of the primary teeth has been compared. Materials and Methods: Sixty patients between 4 and 8 years of age with a single-rooted deciduous tooth indicated for pulpectomy were included. The infected teeth were randomly allocated to one of the three treatment groups based on the irrigating agents used, namely normal saline, green tea extract, or ozonated water. Specimens for anaerobic culture were collected three times from the teeth: before irrigation, after initial irrigation, and on the 3rd day after final irrigation. Results and Conclusion: Mean colony forming unit (CFU) count after both initial and final irrigation with ozonated water was significantly lower when compared with green tea and normal saline. Further, it was observed that the mean CFU count with green tea was significantly lower than the counts obtained with normal saline on the 3rd day after final irrigation. Hence, both ozonated water and green tea could be considered a good alternative to conventional root canal irrigants in the primary teeth. Larger sample sizes with a larger variety of irrigants are recommended.


Asunto(s)
Antiinfecciosos , Ozono , Niño , Preescolar , Cavidad Pulpar , Humanos , Pulpectomía , Irrigantes del Conducto Radicular , Preparación del Conducto Radicular , Solución Salina , Hipoclorito de Sodio , , Diente Primario
19.
Niger J Clin Pract ; 23(7): 950-956, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-32620724

RESUMEN

Background: During post restoration, different root structures require several types of posts to increase duration of their clinical use. Several materials have been investigated to enhance their quality and optimize their length according to the available root canal. Aims: The aim of this study was to determine the effect of zirconia, fiber, and ceromer posts with 3- and 6-mm post sizes on the bonding strength of them to root canal dentinal wall with the means of pull-out bond strength test. Methods: Forty-eight single-rooted mandibular human premolar teeth were collected and prepared for this in vitro study. With resin cement, 3- and 6-mm study posts including zirconia, fiber, and ceromer were luted to prepare teeth. For the retention testing, the pull-out force was applied to each specimen parallel to longitudinal axis of both the post and tooth. Results: Both type of materials and size of posts changed the value of bonding strength. In all the post types, 6-mm ones performed better. Overall, the best bonding strength was obtained with fiber posts and the better bonding strength was obtained with zirconia; however, ceromer provided the least bonding strength. Conclusion: Current experiments supported that 6-mm post size can increase the bonding between root canal dentin and studied posts. When considering post materials, fiber provided the best bonding strength in current laboratory setup. Second, zirconia had meaningfully acceptable bonding strength; however, the bonding strength of ceromer posts was not favorable. Further studies optimizing post fabrication techniques of root materials may increase the bonding strength of posts to human dentin to an acceptable clinical degree.


Asunto(s)
Recubrimiento Dental Adhesivo , Cavidad Pulpar , Dentina , Técnica de Perno Muñón , Cementos de Resina/química , Tratamiento del Conducto Radicular/métodos , Raíz del Diente/cirugía , Cerámica , Resinas Compuestas , Vidrio/química , Humanos , Ensayo de Materiales , Circonio
20.
Wiad Lek ; 73(6): 1119-1123, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32723937

RESUMEN

OBJECTIVE: The aim: To study the effectiveness of chronic apical periodontitis treatment by the combined use of ultrasonic treatment of root canals and multicomponent antimicrobial gel according to the results of clinical and microbiological researches. PATIENTS AND METHODS: Materials and methods: 64 patients with chronic apical periodontitis at the age of 18-56 years were treated. Patients were divided into two groups: the main and control. In the main group the root canals of 36 teeth were sonicated in combination with multicomponent antimicrobial gel, in the control - 35 teeth were treated by a standard method. The content of the root canals for microbiological studies was obtained before endodontic treatment and before permanent obturation. Frequency of content and number of bacteria in the samples were evaluated. RESULTS: Results: All samples before treatment were positive for the presence of variable bacterial flora, among which Staphylococcus epidermidis (43.9%), Enterococcus faecalis (37.9%), Streptococcus spp. (24.8%), Candida albicans (24.4%), Fusibacterium (9.4%) were the most dominant, their number was 7.4-4.8 lg CFU/ml. Repeated research after the proposed and standard method of root canal decontamination has shown a significant decrease in microflora. According to the data of clinical and microbiological examination, the method which was developed by us revealed a positive result in 86% of cases compared with 63% when treated by the standard method. CONCLUSION: Conclusions: The effectiveness of a complex treatment method with combined use of the ultrasonic irrigation and multicomponent antimicrobial gel for root canals decontamination in chronic apical periodontitis is demonstrated. Significant reduction of microflora growth and destruction of microbial associations, good penetration of multicomponent antimicrobial gel into endodontic structures due to ultrasound compared with a standard method were achieved.


Asunto(s)
Periodontitis Periapical , Bacterias , Descontaminación , Cavidad Pulpar , Humanos , Tratamiento del Conducto Radicular
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