Marilia Marceliano-Alves
Universidade Iguaçu, Dental Research in Dentistry, Faculty Member
- I am specialist in Endodontics, Masters degree in Dentistry (Endodontics) Pará Federal University, PhD in Endodontics... moreI am specialist in Endodontics, Masters degree in Dentistry (Endodontics) Pará Federal University, PhD in Endodontics at the Rio de Janeiro State University. I´m currently a postdoctoral researcher at Estácio de Sá University - Rio de Janeiro and professor of Endodontics at Dental Association - Niterói (Rio de Janeiro), at Santos-Dumont Air Force Dental Clinic (Rio de Janeiro) and at Rio de Janeiro Federal University.edit
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Effective management of healthcare services requires continuous improvements due to limited resources and increasing demand. Health indicators provide measurable information about system performance, guiding improvements and informed... more
Effective management of healthcare services requires continuous improvements due to limited resources and increasing demand. Health indicators provide measurable information about system performance, guiding improvements and informed decisions. This study aims to examine how health indicators act as drivers for improvement in the management of health services. This is an integrative literature review, carried out between the months of August and September 2023, in the SciELO, VHL and Google Scholar databases. A total of 236 articles were found, after screening with the criteria defined by the research, only 10 studies were selected to compose the final sample. Health indicators cover a variety of areas, including mortality, birth rate, morbidity, immunization and access to health care, allowing assessment of a population's health status and areas of concern. It is concluded that health indicators offer crucial information on various aspects of health service management, allowing...
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Objetivo: Avaliar o desgaste, após simulação de uso clínico, de instrumentos K3 (SybronEndo, Orange, CA, EUA) e ProTaper (Dentsply-Mail-lefer, Tulsa, Oklahoma, EUA) em 46 raízes mesiovestibulares de primeiros molares superiores humanos,... more
Objetivo: Avaliar o desgaste, após simulação de uso clínico, de instrumentos K3 (SybronEndo, Orange, CA, EUA) e ProTaper (Dentsply-Mail-lefer, Tulsa, Oklahoma, EUA) em 46 raízes mesiovestibulares de primeiros molares superiores humanos, recém-extraídos ...
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This article examines the potential to tackle the roots of inequality by the introduction of one or more social wealth funds. Such funds would aim to capture some of the financial gains from the private ownership of capital—a principal... more
This article examines the potential to tackle the roots of inequality by the introduction of one or more social wealth funds. Such funds would aim to capture some of the financial gains from the private ownership of capital—a principal driver of inequality—and use the proceeds for wider community benefit, such as investment in social infrastructure. In recent decades a number of countries have introduced a variant on such funds, mostly taking the form of state‐owned sovereign wealth funds resourced through the exploitation of oil, and used for a diversity of economic purposes. In contrast, the UK has failed to take the opportunity to create such funds by, for example, reinvesting the revenue from the sales of public assets. So would it be possible to build one or more such collectively owned funds in the UK, and if so, how should they be financed? As well as funding social investment and anti‐inequality programmes, could such a scheme also help finance a regular Citizen's Divide...
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Objetivo: Avaliar o desgaste, após simulação de uso clínico, de instrumentos K3 (SybronEndo, Orange, CA, EUA) e ProTaper (Dentsply-Mail-lefer, Tulsa, Oklahoma, EUA) em 46 raízes mesiovestibulares de primeiros molares superiores humanos,... more
Objetivo: Avaliar o desgaste, após simulação de uso clínico, de instrumentos K3 (SybronEndo, Orange, CA, EUA) e ProTaper (Dentsply-Mail-lefer, Tulsa, Oklahoma, EUA) em 46 raízes mesiovestibulares de primeiros molares superiores humanos, recém-extraídos ...
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To evaluate the internal morphology of 100 distal roots of mandibular first molars using micro‐CT. Teeth were scanned to characterise: Vertucci type, root length, canal shape, presence and location of accessory canals, and the number of... more
To evaluate the internal morphology of 100 distal roots of mandibular first molars using micro‐CT. Teeth were scanned to characterise: Vertucci type, root length, canal shape, presence and location of accessory canals, and the number of foramina at 4 mm from the apex, presence of root isthmus and the length from the primary canal to the apical foramen. Vertucci type I was found in 57% of cases, followed by V (27%). The most common cross‐section 1 mm from the apex was oval (49%) and circular (38%). The average root length was 16.06 mm (16.61–19.02 mm). The mean foramen size was 0.32 and 0.53 mm for the minor and major diameters, respectively. The volume, surface area and SMI were 7.84 mm3, 68.87 mm2 and 1.52 mm, respectively. Root isthmi were found in 47% of the samples, and the length mean from the primary canal to the apical foramen was 2,03 mm. The internal morphology of the distal roots of mandibular first molars may be complex and shows variations.
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AimThis study compared the shaping ability of four new reciprocating and rotary nickel‐titanium instruments, with triangular or S‐shaped cross‐section, in the mesial canals of mandibular molars using micro‐computed tomographic (micro‐CT)... more
AimThis study compared the shaping ability of four new reciprocating and rotary nickel‐titanium instruments, with triangular or S‐shaped cross‐section, in the mesial canals of mandibular molars using micro‐computed tomographic (micro‐CT) evaluation.MethodologyTwenty‐four extracted mandibular molars with Vertucci's class IV configuration in the mesial root were selected for this study. The teeth were matched in fours according to anatomic similarities as revealed by micro‐CT and then distributed into four groups of 12 mesial canals each according to the instrumentation technique: Reciproc Blue, R‐motion, VDW.Rotate and RaCe EVO. The final apical size of instrumentation was 30/0.04 for three systems and 25/08 for the Reciproc Blue instrument. Micro‐CT scans were taken before and after preparation to evaluate the canal volume, area and unprepared surface areas, as well as the centring ability, and the canal: root width ratio.ResultsPreparation with all systems significantly increased the volume and area of the canals (p < .05). There were no significant differences between groups regarding the amount of unprepared areas in both the apical and full canal lengths (p > .05). Variation in the centre of gravity showed no significant difference between groups either (p > .05). The canal: root width ratio at levels 0 and 4 mm apically to the coronal canal opening was significantly increased by all systems (p < .01), with no significant differences between groups (p > .05). The canal width never exceeded 40% of the root width.ConclusionsReciprocating or rotary instruments, with a triangular or an S‐shaped cross‐section, performed equally in shaping Vertucci's class IV mesial canals of mandibular molars.
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AimTo evaluate the influence of the design of endodontic access cavities on the percentage of unprepared areas of canal walls and flexural fatigue of instruments activated by reciprocating movement in oval‐shaped straight root canals of... more
AimTo evaluate the influence of the design of endodontic access cavities on the percentage of unprepared areas of canal walls and flexural fatigue of instruments activated by reciprocating movement in oval‐shaped straight root canals of extracted teeth.MethodologyForty‐two mandibular incisors with oval canals were scanned by a microcomputed tomography (micro‐CT) device for homogeneous selection and distribution of the samples. Then, the teeth were divided into two groups (n = 21) according to the design of access cavity being tested: ultraconservative endodontic access cavity (UltraAC) and traditional access cavity. The canals were accessed with the aid of a surgical microscope, instrumented with the WaveOne Gold Medium system and irrigated with 2.5% NaOCl and 17% EDTA. The unprepared areas of the canal wall were analysed by overlaying images before and after instrumentation and expressed as percentages. micro‐CT data were analysed using t‐test, Mann–Whitney and Wilcoxon tests. The endodontic instruments used during instrumentation were subjected to static flexural fatigue testing using an artificial stainless steel canal with a 60° angle of curvature and a radius of 5 mm, located 5 mm from the tip of the instrument. The instruments were activated until fracture occurred, and the time in seconds for the fracture was recorded using a digital timer. The number of cycles to fracture was calculated and analysed statistically. For flexural fatigue data, an anova test complemented by a Tukey range test was used. The significance level of 5% was used for all analyses.ResultsThere was no significant difference between the groups related to unprepared areas by the instrument during canal preparation (p > .05). The difference in flexural fatigue resistance between the groups was not significant.ConclusionThe use of UltraAC did not interfere with the canal instrumentation of extracted mandibular incisors with straight and oval canals. There was no difference in the flexural fatigue resistance of the instruments in relation to access cavity design.
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A thorough knowledge of root canal anatomy is critical for successful root canal treatments. This study evaluated the internal anatomy of the palatal roots of maxillary first molars with micro-computed tomography (microCT). The palatal... more
A thorough knowledge of root canal anatomy is critical for successful root canal treatments. This study evaluated the internal anatomy of the palatal roots of maxillary first molars with micro-computed tomography (microCT). The palatal roots of extracted maxillary first molars (n = 169) were scanned with microCT to determine several anatomic parameters, including main canal classification, lateral canal occurrence and location, degree of curvature, main foramen position, apical constriction presence, diameters 1 and 2 mm from the apex and 1 mm from the foramen, minor dentin thickness in those regions, canal volume, surface area, and convexity. All canals were classified as Vertucci type I. The cross sections were oval in 61% of the canals. Lateral canals were found in 25% of the samples. The main foramen did not coincide with the root apex in 95% of the cases. Only 8% of the canals were classified as straight. Apical constriction was identified in 38% of the roots. The minor and major canal diameters and minor dentin thickness were decreased near the apex. The minor dentin thickness 1 mm from the foramen was 0.82 mm. The palatal canals exhibited a volume of 6.91 mm(3) and surface area of 55.31 mm(2) and were rod-shaped. The root canals of the palatal roots were classified as type I. However, some factors need to be considered during the treatment of these roots, including the frequent ocurrence of moderate/severe curvatures, oval-shaped cross-sections, and lateral canals, noncoincidence of the apical foramen with the root apex, and absence of apical constriction in most cases.
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Objective The aim of this study was to analyze the internal morphology of deciduous molars through the use of computed microtomography in a sample from Rio de Janeiro. Material and Methods Thirty maxillary and 30 mandibular deciduous... more
Objective The aim of this study was to analyze the internal morphology of deciduous molars through the use of computed microtomography in a sample from Rio de Janeiro. Material and Methods Thirty maxillary and 30 mandibular deciduous molars (n = 60), divided in first and second primary molars, were scanned by computed microtomography. The teeth were evaluated for root number, root canals, Vertucci classification, root curvature, presence of lateral canals, furcation dentin thickness, structure model index (SMI), volume, and canal surface area. Results The results showed 100% of maxillary molars had three roots and Vertucci type I canal was more prevalent in this group. In the mandibular ones, type IV was more frequent in the mesial root and class I in the distal root and the cavo-interradicular canal occurred in 2 specimens. Dentin thickness in the furcation region measured 1.53 and 1.59 mm in the maxillary and mandibular, respectively. Volume and area parameters varied according to...
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Objective Airborne particles are one of the most important factors in the spread of infectious pathogens and must be monitored in healthcare facilities. Viable particles are living microorganisms, whereas non-viable particles do not... more
Objective Airborne particles are one of the most important factors in the spread of infectious pathogens and must be monitored in healthcare facilities. Viable particles are living microorganisms, whereas non-viable particles do not contain microorganisms but act as transport for viable particles. The effectiveness of ozone in reducing these particles in a non-controlled room and a controlled cleanroom using high-efficiency particles air (HEPA) filter was analyzed in this study. Materials and Methods Viable particles and non-viable particles sized 0.5 and 5 μm were quantified before and after ozonation in two different health environments: non-controlled (group 1) and controlled area, which was associated with a HEPA filtering system (group 2). Active air sampling using a MAS 100 was used to count the number of viable particles, while the number of non-viable particles/m3 was obtained following the manufacturer's recommendations of the Lasair III 310C system. Results Our results...
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The aim of the study was to evaluate the accuracy of microcomputed tomography (mCT) to detect dentinal cracks when compared with scanning electron microscopy (SEM) and operating microscopy (OM). Different conditions of pixel size (10 or... more
The aim of the study was to evaluate the accuracy of microcomputed tomography (mCT) to detect dentinal cracks when compared with scanning electron microscopy (SEM) and operating microscopy (OM). Different conditions of pixel size (10 or 17 μm), sample moisture (dry/moist), and transillumination (with/without) were evaluated. Additionally, the influence of the dentinal defect width on its detection was analyzed. The root canals of human mandibular incisors were prepared with the Reciproc R40 instrument (VDW, Munich, Germany). The roots were sectioned 5 and 10 mm from the apex, and mCT scans of middle and apical segments were performed at two pixel sizes: 10 μm and 17 μm, under dry and moist conditions (groups: 10dry, 10moist, 17dry, and 17moist). The operating microscope was used with and without transillumination (groups: OMTrans and OM). Findings showed that accuracy was moderate for the 10dry, 10moist, and OMTrans groups, poor for OM and very poor for 17dry and 17moist. The thickn...
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OBJECTIVES This study using contralateral teeth from human cadavers assessed the amount of unprepared wall surface areas (USA), accumulated hard tissue debris (AHTD), and dentinal crack formation after root canal preparation using either... more
OBJECTIVES This study using contralateral teeth from human cadavers assessed the amount of unprepared wall surface areas (USA), accumulated hard tissue debris (AHTD), and dentinal crack formation after root canal preparation using either reciprocating or rotary instruments. MATERIALS AND METHODS Incisors with a single root canal from 11 human mandibles had their root canals prepared with Reciproc or Mtwo. Each contralateral tooth was treated with one of the test instruments in order to create matched pairs. Micro-CT scans were taken before and after preparation to instrument sizes 40 and 50 in both groups. USA and AHTD were evaluated in the full canal length or the apical portion only. Crack formation was also evaluated in the full root length. RESULTS After size 40, no significant differences in USA and AHTD were observed in the full canal length (P > .05). Separate analysis of the apical 4-mm canal revealed no difference in AHTD, but significantly more USA with Mtwo than Reciproc (P < .05). After size 50, the amount of USA was similar between groups both in the full canal and in the apical canal (P > .05). More AHTD were observed in the full canal after using Mtwo size 50 (P < .05), but no difference occurred in the apical canal only (P > .05). Intragroup analyses showed a significant decrease of USA and a significant increase of AHTD when preparation size increased from 40 to 50 (P < .05). In teeth without any pre-existing detectable dentinal defect (n = 38), crack formation occurred in 4 teeth, 2 from each preparation system. CLINICAL RELEVANCE Reciproc instrument size 40 resulted in more prepared areas in the apical canal than Mtwo instrument of the same size. However, the amount of AHTD did not differ between them at this file size. Canal enlargement to size 50 prepared more walls but created more debris. Dentinal defects were produced after preparation with both systems.
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A estreita relacao entre a anatomia interna e a obtencao de exito no tratamento endodontico leva a reflexao sobre a importância do conhecimento da anatomia do sistema de canais radiculares, bem como de suas variacoes. Uma dessas variacoes... more
A estreita relacao entre a anatomia interna e a obtencao de exito no tratamento endodontico leva a reflexao sobre a importância do conhecimento da anatomia do sistema de canais radiculares, bem como de suas variacoes. Uma dessas variacoes pode ser encontrada no 1° pre-molar superior, que pode apresentar um terceiro canal que se nao localizado, pode influenciar o prognostico do tratamento. O objetivo do presente trabalho foi a realizacao de uma breve revisao de literatura e da apresentacao de um caso clinico de localizacao e tratamento do terceiro canal na raiz vestibular em um pre-molar superior, que contribuiu para o sucesso do tratamento endodontico. Ao final, pode-se enfatizar a importância do conhecimento da anatomia, bem como da necessidade da correta inspecao do soalho da câmara pulpar para a localizacao e tratamento desse terceiro canal, para assim contribuir com o sucesso da terapeutica endodontica.
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El estudio de la anatomia y complejidad de los conductos radiculares tiene relevancia clinica y puede relacionarse con causas frecuentes de fracaso endodontico. Los istmos son comuni- caciones estrechas entre conductos, consideradas areas... more
El estudio de la anatomia y complejidad de los conductos radiculares tiene relevancia clinica y puede relacionarse con causas frecuentes de fracaso endodontico. Los istmos son comuni- caciones estrechas entre conductos, consideradas areas de dificil acceso1, impidiendo la remocion de remanentes bacterianos y tejido pulpar2 , volviendose un desafio para los endodoncistas. No hay lite- ratura de metodos de limpieza y modelado eficiente de estas areas. La incidencia reportada de istmos es de 75-100% 1 en raices mesiales de primeros molares superiores y 83%3 de raices distales de mo- lares inferiores.
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The objective was to evaluate the shaping ability of XP‐endo Shaper and Mtwo systems in oval‐shaped canals preparation by microcomputed tomography (micro‐CT) along the entire canal. The volume, surface area and percentage of unprepared... more
The objective was to evaluate the shaping ability of XP‐endo Shaper and Mtwo systems in oval‐shaped canals preparation by microcomputed tomography (micro‐CT) along the entire canal. The volume, surface area and percentage of unprepared area were evaluated by image processing in entire canal and apical third (5 mm). Apical transportation and centring ability were evaluated at 3, 5 and 7 mm from the apex. Forty single‐canal oval canines were paired in two groups (n = 20) according to the instrumentation system: XP‐endo Shaper and Mtwo. The teeth were scanned by micro‐CT before and after instrumentation, using a thermal vat at 37°C. The XP‐endo Shaper system was more effective in the instrumentation of oval‐shaped canals when compared to Mtwo system, resulting in greater volume increases and lower percentage of unprepared canals walls in apical region. Regarding apical transportation and centring ability, no statistical difference was observed.
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This study compared the efficacy of XP‐Endo Finisher R and R1‐Clearsonic insert in removing filling material remnants from oval canals. Twelve pairs of contralateral premolars were treated and subsequently retreated with Reciproc 50. A... more
This study compared the efficacy of XP‐Endo Finisher R and R1‐Clearsonic insert in removing filling material remnants from oval canals. Twelve pairs of contralateral premolars were treated and subsequently retreated with Reciproc 50. A supplementary procedure with XP‐Endo Finisher R or R1‐Clearsonic was performed. Micro‐computed tomography was used to quantify the filling material volume in the full canal and apical segment lengths. Intragroup analyses revealed significant reduction of filling material after both procedures, not only in the full canal but also in the apical segment (P < 0.05). The amount of filling material removed with XP‐Endo Finisher R and R1‐Clearsonic was 47.9% and 52.2% in the apical segment (P > 0.05), and 82.1% and 64.6% in the full canal (P < 0.05). None of the instruments was effective in completely removing the filling material from the apical canal, but better results were obtained with XP‐Endo Finisher R in the total canal length.
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INTRODUCTION This study assessed the amount of unprepared surface areas at the apical 4-mm segment of the root canal after a planned preparation based on cone-beam computed tomography (CBCT) measurements. METHODS Eighteen posterior... more
INTRODUCTION This study assessed the amount of unprepared surface areas at the apical 4-mm segment of the root canal after a planned preparation based on cone-beam computed tomography (CBCT) measurements. METHODS Eighteen posterior mandible segments were obtained from cadavers and scanned using CBCT and micro-computed tomographic (micro-CT) imaging. CBCT images were used to measure the largest initial canal diameter from 29 root canals of premolars at 1, 2, 3, and 4 mm short of the apical foramen. Each measurement was used to select a master apical instrument (MAI) that was one diameter larger to prepare the apical 4 mm of each particular root canal. A post-preparation micro-CT scan was obtained, and the unprepared canal areas were calculated. RESULTS A very high amount of surface areas over the apical 4-mm of the root canal was included in the final preparation (>90%). The unprepared areas ranged from as low as3.7% to a maximum of 14.6% (mean and median, 9.2% and 9.1%, respectively). CONCLUSIONS The proposed planned apical root canal preparation resulted in optimized root canal shaping with a substantial amount of prepared surface areas. The protocol used also resulted in a conservative canal enlargement, using a final instrument that was one size larger than the initial largest canal diameter.
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Objective This study compared the shaping ability of the Hyflex CM and XP-endo Shaper rotary file systems in curved mesial canals of mandibular molars using micro-computed tomography. Material and Methods Seventeen mesial roots of... more
Objective This study compared the shaping ability of the Hyflex CM and XP-endo Shaper rotary file systems in curved mesial canals of mandibular molars using micro-computed tomography. Material and Methods Seventeen mesial roots of extracted first mandibular molars with two independent mesial canals were scanned before and after root canal preparation with the tested rotatory file systems. Each mesial canal from the same specimen was prepared with one of the two systems. The parameters analyzed were canal centering (transportation) for the cervical, middle, and apical segments, as well as for the entire canal (0–10 mm from the apex); and canal volume increase, canal surface area increase, and unprepared canal walls for two segments, 0 to 4 mm and 0 to 10 mm from the apex. Results There was no significant difference between both systems regarding canal centering (transportation), volume increase, and unprepared canal walls for the 0 to 10 mm segment (p> 0.05); however, a significan...
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This study compared the shaping ability of single-file reciprocating (WaveOne Gold) and multifile rotary (Mtwo) systems on mandibular oval-shaped canine root canals, using microcomputed tomography (micro-CT). Thirty mandibular canines... more
This study compared the shaping ability of single-file reciprocating (WaveOne Gold) and multifile rotary (Mtwo) systems on mandibular oval-shaped canine root canals, using microcomputed tomography (micro-CT). Thirty mandibular canines were scanned by micro-CT and assigned to one of two groups (n=15) according to the system used for root canal preparation: WaveOne Gold or Mtwo. After preparation, the teeth were rescanned, and the percentage of untouched canal area, apical transportation and centering ability were analyzed. The data was evaluated using Kruskal and Mann- Whitney tests (p<0.05). No difference was found in percentage of unprepared canal area between groups in the entire root canal or the apical third, or in centering ability (p>0.05). WaveOne gold had less canal transportation than MTwo at the 5 mm section (p<0.05). WOG and Mtwo systems presented similar shaping ability and centering ability in oval-shaped canals. However, WOG presented less transportation than ...
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Objective This study compared the ProTaper Next (PTN; Dentsply Sirona, Tulsa, Oklahoma, United States) and HyFlex EDM (HEDM; Coltene/Whaledent AG, Alstätten, Switzerland) systems using micro–computed tomography (CT). Materials and... more
Objective This study compared the ProTaper Next (PTN; Dentsply Sirona, Tulsa, Oklahoma, United States) and HyFlex EDM (HEDM; Coltene/Whaledent AG, Alstätten, Switzerland) systems using micro–computed tomography (CT). Materials and Methods Twenty-one mesial roots classified as Vertucci's type IV from extracted mandibular first molars with curvatures between 20 and 40 degrees were selected. The teeth were scanned using a micro-CT before and after root canal preparation by both systems, applied to the same root, in alternating canals. The following parameters were analyzed: canal centering, apical transportation, root canal diameter/root diameter. Results No statistically significant differences between both systems were observed for any of the assessed morphological parameters (p > 0.05). All canals presented diameter enlargement of more than 40% in relation to root diameter in the cervical and middle segments. No statistically significant difference was noted between the HEDM ...
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Cavernous hemangiomas are benign malformations of vascular origin, usually well circumscribed and slow to grow. These lesions can be asymptomatic, being discovered unintentionally in imaging exams or symptomatic, indicated mainly by the... more
Cavernous hemangiomas are benign malformations of vascular origin, usually well circumscribed and slow to grow. These lesions can be asymptomatic, being discovered unintentionally in imaging exams or symptomatic, indicated mainly by the presence of proptosis, diplopia, and visual disturbances by optic nerve compression. The complementary exams involve computed tomography associated with contrast, color Doppler, magnetic resonance, and angiography. Treatment can be conservative or surgical depending on the case, and the open therapy usually involves lateral, supraorbital, transconjunctival, transantral, pterional, transnasal, and extradural endoscopic orbitotomy. The present study aims to report a recurrent case of hemangioma in the orbital cavity signaled by ocular proptosis, hyperemia, and ocular pain.The lesion was achieved through the Weber-Ferguson access with zygomatic osteotomy and preservation of the infraorbital nerve. The excision of the lesion was performed, and the previo...
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This report describes a case of sodium hypochlorite (NaOCl) and chlorhexidine (CHX) extrusion through the apical foramen, causing acute pain, swelling and mucosal fenestration. A 62-year-old woman was referred for endodontic treatment in... more
This report describes a case of sodium hypochlorite (NaOCl) and chlorhexidine (CHX) extrusion through the apical foramen, causing acute pain, swelling and mucosal fenestration. A 62-year-old woman was referred for endodontic treatment in the first left maxillary premolar with a diagnosis of necrotic pulp. After the root canal irrigation with 2.5% NaOCl, the patient felt a burning sensation and pain. Discrete swelling and redness were noted in the patient’s face at the end of the session. Antibiotic and corticosteroids were prescribed. In the next appointment, 2% CHX was used, but another episode of extrusion occurred, with a sudden acute pain and intense swelling within a few minutes after the injection. After 2 weeks, the patient exhibited a left-side facial swelling extending anterior and inferior to the left zygomatic arch and superior to the body of the mandible. Oral antibiotic and anti-inflammatory drugs were administered. After 10 days, the swelling had completely diminished,...
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Objectives The oval canals may be associated with inadequate debridement, which can affect the quality of the root canal filling, thus the treatment outcome. The aim of the present work was to compare the quality of oval canals fillings... more
Objectives The oval canals may be associated with inadequate debridement, which can affect the quality of the root canal filling, thus the treatment outcome. The aim of the present work was to compare the quality of oval canals fillings using EndoSequence BC sealer with the single-cone technique or cold lateral compaction. Materials and Methods Thirty-eight human single-rooted premolars with oval canals were instrumented to 1 mm from the apical foramen with hand nickel–titanium files, followed by circumferential filing with Hedstrom files. Teeth were paired into two groups based on their micro-computed tomography (CT) morphological parameters. Both groups were filled using EndoSequence BC sealer. The first used a single cone and the other with the cold lateral compaction technique. The voids volume was evaluated by micro-CT and the percentage was calculated for the total length and for the apical 5 mm of each canal. The Mann–Whitney U test was used to assess whether the surface area...
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Objective This study aimed to evaluate the influence of chelating agents (EDTA, citric acid and Tetraclean) on glass fiber posts adhesion to root dentin. Materials and Methods Forty mandibular premolars single canals, with complete apical... more
Objective This study aimed to evaluate the influence of chelating agents (EDTA, citric acid and Tetraclean) on glass fiber posts adhesion to root dentin. Materials and Methods Forty mandibular premolars single canals, with complete apical root, straight, circular cross sections were selected, accessed and had the cervical third prepared with Gates-Glidden drills, then included in resin, instrumented with ProTaper Universal and the root canal obturation was carried out. After, the samples were randomly divided into 4 groups (n = 10) to test the final irrigation solutions: G1:17% EDTA; G2:10% citric acid; G3: Tetraclean and G4: saline solution (control). After 30 days of storage (36.5° C and 100% humidity), the post preparation was performed leaving 4 mm of apical endodontic filling. Then, a fiber-glass post previously selected was coated with ED Primer adhesive system and resin sealer Panavia, installed and stored for 24 hours at 37°C. The samples were subjected to a tensile test wit...
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Objective The aim of present study was to assess the cytotoxicity and antimicrobial efficacy of 2% peracetic acid (PAA) compared with 5.25% sodium hypochlorite (NaOCl) and 2% chlorhexidine (CHX). Material and Methods For the cytotoxicity... more
Objective The aim of present study was to assess the cytotoxicity and antimicrobial efficacy of 2% peracetic acid (PAA) compared with 5.25% sodium hypochlorite (NaOCl) and 2% chlorhexidine (CHX). Material and Methods For the cytotoxicity test, 100 µl of the tested solutions were added in 12 wells with ECV 304 endothelial cells in each group: NaOCl, CHX, and PAA, in addition to the control group. Each solution was evaluated after 24 hours of contact in four dilutions: 0.2, 0.1, 0.05 and 0.025 through mitochondrial function using MTT colorimetric assay. In the antimicrobial evaluation, 40 dentin blocks 5 mm in length and 0.2 g in weight were incubated with 400 µl of Enterococcus faecalis suspension for 21 days at 37°C. The contaminated samples were divided into three experimental groups within 5 minutes of contact: NaOCl group, CHX group, PAA group, as well as the positive control group. The specimens received treatment and were transferred to a tube with saline for serial dilution of...
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Knowledge about both the external and internal anatomy of teeth is essential for the success of endodontic treatment. The mandibular molars are prone to anatomical variations such as the presence of an additional root located lingual to... more
Knowledge about both the external and internal anatomy of teeth is essential for the success of endodontic treatment. The mandibular molars are prone to anatomical variations such as the presence of an additional root located lingual to the tooth which is named Radix Entomolaris (RE). The aim of the present study was to describe the internal and external morphology of RE, as well as evaluate the prevalence, etiology, and clinical protocol of this atypical anatomy by means of a literature review. The knowledge of these anatomical variations as well as clinical guidelines for the diagnosis and endodontic treatment of RE can minimize procedural errors during root canal preparation, and provide an adapted clinical approach for the dentists, thus culminating in the success of endodontic treatment.