RESUMO
BACKGROUND/PURPOSE: Chronic fatigue root fracture describes a root fracture in a non-root canal treated (non-RCT) tooth. This study aimed to report the incidence and contributing factors of non-RCT teeth with chronic fatigue root fracture in a Taiwanese population. METHODS: This cross-sectional study included teeth extracted at Taipei Veterans General Hospital in Taiwan between 2018 and 2019. The reasons for extractions were recorded and included vertical and horizontal root fractures (VRF and HRF). Comparisons of clinical factors between teeth with fatigue VRF and teeth with fatigue HRF were performed by chi-square or Fisher exact test, where appropriate. RESULTS: Of the 4207 extracted teeth examined, 263 (6.25%) had tooth fracture. Thirty-two non-RCT teeth had chronic fatigue root fracture, including 16 with VRF and 16 with HRF. The incidence was 0.76% (32/4207). The occurrence of chronic fatigue root fracture was higher in males (83.9%). The mean age of the 31 patients with chronic fatigue root fracture was 71.7 ± 13.1 years. More than half of these teeth had intact crowns with severe attrition. The fatigue VRF occurred more frequently in molars (P = 0.003), in roots with a long oval cross-section (P = 0.037), and in terminal teeth (P = 0.013) than the fatigue HRF. CONCLUSION: The incidence of chronic fatigue root fracture is 0.76%. Both VRF and HRF occur mainly in aged males, in posterior teeth with attrition, and in teeth without restoration. Tooth position, cross-section root morphology, and terminal tooth are contributing factors related to chronic fatigue root fracture.
Assuntos
Síndrome de Fadiga Crônica , Fraturas dos Dentes , Masculino , Humanos , Idoso , Pessoa de Meia-Idade , Idoso de 80 Anos ou mais , Estudos Transversais , Raiz Dentária , Incidência , Síndrome de Fadiga Crônica/complicações , Fraturas dos Dentes/complicações , Fraturas dos Dentes/epidemiologiaRESUMO
OBJECTIVES: The experience of pain relief is closely associated with the affective-cognitive processing of hedonic value. Higher pain relief plays a key role in patients' satisfaction with treatment and higher motivation to receive treatment. Previous studies focused on pain and anxiety of endodontic treatment. However, the association between pain relief, pain, and anxiety has not been investigated. MATERIALS AND METHODS: We investigated 35 patients (20 females and 15 males, with mean age 46.3 years old) with symptomatic irreversible pulpitis receiving emergent endodontic treatment. Pain-related experience, including pain relief, pain, and anxiety, was assessed before and after treatment, based on an 11-point numerical scale. RESULTS: We found that before treatment, the expected pain relief (median score = 8) that one anticipated was positively correlated with the degree of pain reduction perceived after treatment (two-tailed rho = 0.51, p = 0.002). Expected pain relief was also positively correlated with the post-treatment relief (two-tailed rho = 0.76, p < 0.001) and the relief recalled after 6 weeks (two-tailed rho = 0.69, p < 0.001). Moreover, logistic regression models revealed that expected pain relief was a significant predictor of the subgroups of low vs. moderate scores of post-treatment pain (B = - 1.06, p = 0.017) and anxiety (B = - 1.60, p = 0.009), controlled for the condition of pre-treatment medication. CONCLUSIONS: The current findings highlight that for patients with symptomatic irreversible pulpitis who received emergent endodontic treatment, their expected pain relief before treatment is a critical factor associated with pain reduction and post-treatment pain/anxiety. CLINICAL RELEVANCE: Assessment of expected pain relief may be integrated into pre-treatment assessment for painful dental patients.
Assuntos
Pulpite , Ansiedade/terapia , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Dor , Manejo da DorRESUMO
BACKGROUND/PURPOSE: Endodontic microsurgery (EMS) is a reliable treatment for teeth with non-healing apical periodontitis. This study evaluated the outcome of EMS with mineral trioxide aggregate as the retrograde filling material and identified potential prognostic factors associated with the EMS outcome. METHODS: Consecutive clinical and radiographic records of EMS performed in a teaching hospital from 2013 to 2017 were reviewed. Cases of root fracture, cemental tear, re-surgery, and incomplete records were excluded. After selection, 268 EMS-treated teeth with the follow-up period more than one year were included. Surgical outcome as success or failure was evaluated according to Molven's criteria. For analysis of potential prognostic factors, multivariate logistic regression was performed followed by bivariate chi-square tests. Stratified analysis was performed to understand the interactions between two prognostic factors. RESULTS: The overall EMS success rate was 89.9% in this study. Tooth type (anteriors vs. molars, odds ratio (OR) = 6.83, P = 0.001, anteriors vs. premolars, OR = 4.27, P = 0.010) and endodontic-periodontal (endo-perio) communicating defects (with vs. without, OR = 4.92, P = 0.005) both had a significant influence on the EMS outcome. The negative impact of endo-perio communicating defects was closely associated with tooth type. Premolars with endo-perio communicating defects had significantly higher rates of failure. CONCLUSION: The EMS outcome is significantly affected by the tooth type and endo-perio communicating defect. The presence of endo-perio communicating defects has a greater negative influence on the success rate for premolars than for anteriors and molars.
Assuntos
Materiais Restauradores do Canal Radicular , Humanos , Microcirurgia , Prognóstico , Estudos Retrospectivos , Materiais Restauradores do Canal Radicular/uso terapêutico , Resultado do TratamentoRESUMO
BACKGROUND/PURPOSE: Dental pulp fibroblasts can protect dental pulp from microbial invasion. However, little is known about the interaction between pulp fibroblasts and the immune cells. In this study, the production of proinflammatory cytokines related to inflammatory cell recruitment was evaluated in tumor necrosis factor (TNF)-α-stimulated human dental pulp fibroblasts (HDPFs). The role of TNF-α-stimulated HDPFs in the cell fusion under inflammatory process was determined with the cell co-culture with peripheral blood mononuclear cells (PBMCs). METHODS: HDPFs were stimulated with various concentrations of TNF-α, and the secretion of interleukin (IL)-6, IL-8 and monocyte chemoattractant protein (MCP)-1 was analyzed by the enzyme-linked immunosorbent assay. The mRNA expression levels of intercellular adhesion molecule-1 (ICAM-1), macrophage colony-stimulating factor (M-CSF), receptor activator of nuclear factor κB ligand (RANKL) and osteoprotegerin (OPG) were determined by real-time quantitative polymerase chain reaction. TNF-α-treated HDPFs were co-cultured with PBMCs for 21 days, and characteristics of cell differentiation were assessed. RESULTS: TNF-α induced IL-6, IL-8 and MCP-1 production in HDPFs. Moreover, mRNA expression levels of ICAM-1, M-CSF and OPG were significantly increased in TNF-α-treated HDPFs. Co-culture of TNF-α-treated HDPFs and PBMCs stimulated formation of tartrate-resistant acid phosphatase (TRAP)-positive multinucleated cells, and the F-actin rings were observed in these multinucleated cells. CONCLUSION: Our results indicate that under the stimulation of TNF-α, HDPFs may amplify inflammatory response by cytokines production, which in turn can modulate the differentiation of immune cells.
Assuntos
Polpa Dentária , Leucócitos Mononucleares , Fibroblastos , Humanos , InflamaçãoRESUMO
BACKGROUND/PURPOSE: Effective evaluation of students' self-assessment ability is crucial. This study was to develop a standardized 3D printed teaching model accompanied by structured scoring rubrics for preclinical endodontic training, to appraise students' self-assessment ability, and to evaluate their perceptions of the training system. METHODS: The 3D printing model was designed to house a standardized central incisor. Forty-four undergraduate dental students were enrolled and their endodontic performance was self-assessed and also rated by a teaching assistant and a tutor using 3 structured rubrics including access cavity, mechanical preparation, and obturation assessments. In total, 21 rubric evaluation items of preclinical tasks were assessed, and the assessment results from the student, teaching assistant, and tutor were compared. Furthermore, questionnaires were used to evaluate students' experiences with the new system. RESULTS: The tutor, teaching assistant, and students all had similar scorings and high intraclass correlation coefficients (ICC) for mechanical preparation and obturation rubrics, while the students had underestimated scores on the access cavity rubric with a rather low ICC of 0.387, which also lead to the underestimated overall scoring (P < 0.05). Among the 21 evaluation criteria, 9 items were rated statistically different (P < 0.05), which denoted the major deficiencies of students' self-assessments. More than 80% of students rated satisfied for most of the questions regarding the new training system, except the tactile sensation, hardness, and radiopacity. CONCLUSION: The proposed standardized 3D printed model and structured scoring rubrics is feasible for preclinical endodontic training, and standardized evaluation of students' self-assessment ability.
Assuntos
Competência Clínica , Autoavaliação (Psicologia) , Avaliação Educacional/métodos , Humanos , Impressão Tridimensional , EstudantesRESUMO
BACKGROUND: Dental fear is associated with the experience of prior dental treatment and avoidance of dental visits. It remains unclear if individuals show an intention of avoidance (IA) towards treatments that they have not received (i.e., non-experienced dental treatment). The study aims to investigated (a) if individuals showed an increased fear and IA to non-experienced, compared to experienced dental treatment, and (b) if fear and IA to non-experienced treatment is associated with dental anxiety. METHODS: Fear/IA of 12 common conditions of dental treatment of 402 adults were investigated. If subjects have experienced the condition, fear and IA were assessed based on subjects' prior experience (i.e., ExpFear/ExpIA). If they have not experienced the condition, fear and IA were assessed based on their anticipation (i.e., NExpFear/NExpIA). Trait dental anxiety was assessed using the Index of Dental Anxiety and Fear (IDAF-4C+). RESULTS: (A) NExpFear and NExpIA were significantly higher than ExpFear and ExpIA, respectively. (B) The IDAF-4C+ scores are positively correlated with NExpFear/NExpIA and negatively correlated with the magnification of fear (i.e., the discrepancy in the fear/IA of non-experienced vs. experienced conditions). (C) The condition 'extraction of a wisdom tooth' and 'root canal treatment' showed the highest ratings on NExpFear. CONCLUSIONS: Individuals may develop a high degree of fear and IA of the treatment they have not received. Trait dental anxiety plays a key role in the fear of non-experienced treatment.
Assuntos
Ansiedade ao Tratamento Odontológico , Intenção , Adulto , Assistência Odontológica , Medo , Humanos , Psicometria , Reprodutibilidade dos Testes , Inquéritos e QuestionáriosRESUMO
In a minimally invasive surgery, using a bone cement being radiologically detectable is vital to the success of the procedure and avoiding cement leakage in the early stage. The radiopacity of calcium phosphate cement (CPC) is inadequate, thus limiting its clinic application in this area. In this work, bismuth aluminate (BiA) was employed as a radiopaque agent for CPC. The influences of BiA on physicochemical, radiopaque and in vitro biocompatible properties of CPC were investigated. With the increasing content of BiA, the setting time and the compressive strength of CPC were augmented, while the injectability of the cement pastes was reduced. The radiopacity of CPC was significantly improved by adding more than 6 wt.% BiA. CPC specimens with less than 12 wt.% BiA showed good cellular affinity. Moreover, the CPC containing 6 and 9 wt.% BiA promoted the cell growth and ALP activity of mouse bone marrow mesenchymal stem cells when compared with the control. On the basis of its improved radiopacity and cytocompatibility, the radiopaque CPC with 6 ~ 9 wt.% BiA is expected to be a potential substitute for bone defect restoration via minimally invasive surgery. CPC with bismuth aluminate reveals better radiopacity and cell affinity along with proper physicochemical properties.
Assuntos
Alumínio/química , Bismuto/química , Cimentos Ósseos/química , Fosfatos de Cálcio/química , Células-Tronco Mesenquimais/efeitos dos fármacos , Fosfatase Alcalina/metabolismo , Alumínio/farmacologia , Animais , Bismuto/farmacologia , Cimentos Ósseos/farmacologia , Fosfatos de Cálcio/farmacologia , Adesão Celular , Proliferação de Células/efeitos dos fármacos , Células Cultivadas , Teste de Materiais , CamundongosRESUMO
BACKGROUND/PURPOSE: The purpose of this study is to investigate the prevalence and the morphologic characteristics of the radicular groove and root canal system in human mandibular second premolars with C-shaped root in a Taiwan Chinese subpopulation using cone-beam computed tomographic (CBCT) imaging. METHODS: CBCT images of 580 mandibular second premolars were collected from 317 patients. All of the mandibular second premolars were examined in serial axial sections to identify the presence of any C-shaped root and C-shaped canal systems. The morphologic characteristics of mandibular second premolars with C-shaped roots were studied by performing measurements of serial axial sections. RESULTS: The prevalence rate of mandibular second premolars with a C-shaped root was 3.45% (20/580 teeth) and the rate of those with a C-shaped canal system was 2.24% (13/580 teeth). It was found that 69% of the radicular grooves were located on the lingual half of the root (9/13 teeth) in mandibular second premolars with a C-shaped canal system. In those teeth with a lingual radicular groove, the main canal was toward the buccal side. Frequently, the first C-shaped canal image was found at the mid-root level. The deepest part of the radicular groove was located at about 2.5 mm apical to the first C-shaped canal image. CONCLUSION: There was a 2-3% morphologic variation of the mandibular second premolar with a C-shaped root canal system among the Taiwan Chinese subpopulation investigated in this study. Detailed knowledge of the morphological characteristics of teeth may be valuable when choosing clinical treatments.
Assuntos
Povo Asiático , Tomografia Computadorizada de Feixe Cônico , Cavidade Pulpar/anatomia & histologia , Cavidade Pulpar/diagnóstico por imagem , Ápice Dentário/diagnóstico por imagem , Dente Pré-Molar/anatomia & histologia , Dente Pré-Molar/diagnóstico por imagem , Humanos , Mandíbula , Taiwan , Ápice Dentário/anatomia & histologiaRESUMO
Clinicians do not frequently see impacted dilacerated maxillary incisors in their patients. When they do, there are several diagnostic and management challenges for correcting root dilacerations. An unfavorable esthetic outcome might occur as a result of soft-tissue complications during surgical eruption procedures. We present 2 patients with an impacted and dilacerated maxillary central incisor. Computed tomography scans with 3-dimensional reformation were used to accurately assess the positions of the dilacerated teeth, the degree of dilaceration, and the stage of root formation. The therapy primarily involved 2-stage crown exposure surgery combined with orthodontic traction. An apicoectomy was performed on 1 dilacerated tooth; the other exhibited pulp vitality. This article highlights the periodontal surgical strategies for the esthetic management of inverted crowns. Through periodontal plastic surgery and interdisciplinary cooperation, the impacted dilacerated central incisors were properly aligned, and successful esthetic results were achieved.
Assuntos
Estética Dentária , Incisivo/anormalidades , Periodonto/cirurgia , Raiz Dentária/anormalidades , Dente Impactado/cirurgia , Apicectomia/métodos , Criança , Feminino , Humanos , Imageamento Tridimensional/métodos , Incisivo/cirurgia , Maxila/cirurgia , Planejamento de Assistência ao Paciente , Obturação Retrógrada/métodos , Retalhos Cirúrgicos , Tomografia Computadorizada por Raios X/métodos , Coroa do Dente/cirurgia , Técnicas de Movimentação Dentária/métodos , Raiz Dentária/cirurgia , Resultado do TratamentoRESUMO
BACKGROUND/PURPOSE: Isolation of teeth with rubber dams is an important procedure for infection control in dentistry, especially in endodontic treatment. This study surveyed the prevalence of rubber dam usage in nonsurgical root canal treatment (RCT) by dentists under the National Health Insurance system in Taiwan. METHODS: A total of 1,332 completed RCT cases were randomly selected from a large database from the Bureau of National Health Insurance in Taiwan in 2004. The radiographs and dental charts of the selected cases were evaluated for the prevalence of rubber dam usage in RCT. The frequencies of rubber dam usage for RCT by dentists were compared between hospitals and private dental clinics and among six different regions in Taiwan. RESULTS: The overall prevalence of rubber dam usage for RCT by dentists under the National Health Insurance system in Taiwan was 16.5%. The frequency of rubber dam usage for RCT by dentists in hospitals (32.8%) was significantly higher than that (10.3%) in private dental clinics (p < 0.0001). However, there was no significant difference in the frequency of rubber dam usage for RCT by dentists among six different geographic regions in Taiwan. CONCLUSION: The prevalence of rubber dam usage for RCT by dentists in Taiwan is relatively low. Because rubber dam isolation of an endodontically-treated tooth can provide better infection control, increase patient protection, and improve treatment efficiency, there is an urgent need to advise dentists in Taiwan to use rubber dams for every RCT case.
Assuntos
Unidade Hospitalar de Odontologia/estatística & dados numéricos , Controle de Infecções Dentárias/estatística & dados numéricos , Prática Privada/estatística & dados numéricos , Tratamento do Canal Radicular , Diques de Borracha , Doenças Dentárias/terapia , Cavidade Pulpar/diagnóstico por imagem , Unidade Hospitalar de Odontologia/normas , Humanos , Ortodontia Preventiva/estatística & dados numéricos , Padrões de Prática Odontológica/normas , Prevalência , Prática Privada/normas , Melhoria de Qualidade , Radiografia , Tratamento do Canal Radicular/instrumentação , Tratamento do Canal Radicular/estatística & dados numéricos , Diques de Borracha/estatística & dados numéricos , Taiwan/epidemiologia , Doenças Dentárias/diagnóstico , Doenças Dentárias/epidemiologiaRESUMO
In a minimally invasive surgery of osteoporotic fractures, high radiopacity is necessary to monitor the delivery and positioning of injectable cements and good osteogenesis is indispensable. In this work, strontium ranelate (SrR), an agent for treating osteoporosis, is firstly used as a radiopaque agent for calcium phosphate cement (CPC). The addition of SrR does not affect the hydration products of CPC, but prolonged the setting time and decreased the compressive strength. The injectability of the cement was higher than 85% when SrR content is more than 10 wt%. The radiopacity of CPC is significantly improved by SrR and higher than cortical bone when the content of SrR is more than 5 wt%. The concentration of Sr ions released from CPC is increased by the increasing content of SrR, which is among 17-1329 µM. Moreover, CPCs with SrR significantly promote the osteogenic differentiation of mouse bone marrow mesenchymal stem cells and inhibit the osteoclastogenic differentiation of RAW264.7 cells. Based on its good radiopacity and osteogenesis, suppressed osteoclastogenesis and appropriate physicochemical properties, the radiopaque CPC with more than 10 wt% SrR is prospective to be a promising biomaterial for osteoporotic fracture repairing in minimal invasive surgery.
Assuntos
Cimentos Ósseos/química , Fosfatos de Cálcio/química , Osteogênese/efeitos dos fármacos , Tiofenos/química , Animais , Materiais Biocompatíveis , Células da Medula Óssea/citologia , Adesão Celular , Diferenciação Celular , Proliferação de Células , Sobrevivência Celular , Células Cultivadas , Força Compressiva , Meios de Cultura , Perfilação da Expressão Gênica , Íons , Teste de Materiais , Células-Tronco Mesenquimais/citologia , Camundongos , Procedimentos Cirúrgicos Minimamente Invasivos , Osteoclastos/citologia , Osteoporose , Reologia , Estresse MecânicoRESUMO
OBJECTIVE: Effects of tea catechin epigallocatechin-3-gallate (EGCG) against biofilm formation by Streptococcus mutans and probiotic Lactobacillus casei in Yakult® (LcY) were examined. DESIGN: Biofilms were formed by S. mutans alone (Sm) and co-culture of S. mutans and LcY (Smâ¯+â¯LcY) in the absence or presence of EGCG. The biomass of biofilms, which were sonicated or not, was measured by the crystal violet assay. Biofilm morphology was observed by scanning electron microscopy. Bacterial viability and extracellular polysaccharides were determined by SYTO9/propidium iodide and dextran-conjugated fluorescein staining, respectively, and confocal microscopy. Gene expression of glucosyltransferase was determined by quantitative polymerase chain reaction. RESULTS: While 250⯵g/ml EGCG significantly decreased the biomass and acid production of Sm biofilms, 500⯵g/ml EGCG was required to inhibit Smâ¯+â¯LcY biofilm formation and acid production. EGCG decreased the amount of live bacteria present in both Sm and Smâ¯+â¯LcY biofilms. The level of dead bacteria in Smâ¯+â¯LcY biofilms was higher than in Sm biofilms when formed in the presence of 250⯵g/ml EGCG. EGCG decreased levels of extracellular polysaccharides in Sm and Smâ¯+â¯LcY biofilms. The extent of biofilm removal by sonication was not different between Sm and Sm+LcY biofilms formed in the absence or presence of 62.5 or 125⯵g/ml EGCG. The level of Sm gtfB and gtfD expression in Smâ¯+â¯LcY biofilms was higher than those in the Sm biofilms when formed in the presence of EGCG at 250⯵g/ml. CONCLUSION: The results indicated that LcY might interfere the inhibitory effects of EGCG against biofilm formation by S. mutans.
Assuntos
Antibacterianos/farmacologia , Biofilmes/efeitos dos fármacos , Catequina/análogos & derivados , Catequina/antagonistas & inibidores , Lacticaseibacillus casei/efeitos dos fármacos , Probióticos , Streptococcus mutans/efeitos dos fármacos , Chá/química , Proteínas de Bactérias/metabolismo , Biofilmes/crescimento & desenvolvimento , Biomassa , Relação Dose-Resposta a Droga , Regulação Bacteriana da Expressão Gênica/efeitos dos fármacos , Regulação Bacteriana da Expressão Gênica/genética , Glucosiltransferases/metabolismo , Lacticaseibacillus casei/genética , Lacticaseibacillus casei/metabolismo , Testes de Sensibilidade Microbiana , Viabilidade Microbiana/efeitos dos fármacos , Polissacarídeos/metabolismo , Streptococcus mutans/genética , Streptococcus mutans/metabolismoRESUMO
Eugenol is commonly used as an analgesic agent during acute pulpitis and is a major component of root canal sealers. Despite the frequent applications of eugenol in the practice of dentistry, little is known about the role of eugenol under the status of inflammation. This study was aimed to investigate the influence of eugenol on human macrophages (U937) under the stimulation of lipopolysaccharide (LPS). Eugenol was shown to block the release of the bone resorbing mediators, including interleukin-1beta (IL-1beta), tumor necrosis factor-alpha (TNF-alpha), and prostaglandin E2 from LPS-stimulated macrophages. In contrast, eugenol alone did not alter the expression levels of these proinflammatory mediators in macrophages. Consistent with downregulation of bone-resorbing mediators, eugenol suppressed the messenger RNA expression of LPS-induced IL-1beta, TNF-alpha, and cyclooxygenase-2 in macrophages. The results suggest a potential anti-inflammatory effect of eugenol in the acute inflamed pulps and apical periodontitis.
Assuntos
Anti-Inflamatórios/farmacologia , Eugenol/farmacologia , Mediadores da Inflamação/antagonistas & inibidores , Ciclo-Oxigenase 2/biossíntese , Inibidores de Ciclo-Oxigenase 2/farmacologia , Dinoprostona/antagonistas & inibidores , Dinoprostona/metabolismo , Regulação para Baixo , Humanos , Interleucina-1beta/antagonistas & inibidores , Lipopolissacarídeos/imunologia , Macrófagos/efeitos dos fármacos , Macrófagos/metabolismo , Fator de Necrose Tumoral alfa/antagonistas & inibidores , Células U937RESUMO
Because eugenol is a major component of root canal sealers and retrograde filling materials, its effects on periapical bone healing are therefore of concern. In this study, the effects of eugenol on the activation of nuclear factor kappa B (NF-kappaB) and the expression of cyclooxygenase-2 (COX-2) in human osteoblasts were investigated. The results showed that eugenol activated the nuclear translocation of NF-kappaB. In addition, COX-2 protein expression in osteoblasts was induced by eugenol in a dose-dependent manner. Furthermore, the eugenol-modulated COX-2 expression was inhibited by an NF-kappaB inhibitor, N-acetylcysteine. Taken together, eugenol might induce COX-2 expression through the activation of NF-kappaB in human osteoblasts. These results suggest that eugenol might be involved in periapical healing by impairing the functions of osteoblasts.
Assuntos
Ciclo-Oxigenase 2/efeitos dos fármacos , Eugenol/farmacologia , NF-kappa B/efeitos dos fármacos , Osteoblastos/efeitos dos fármacos , Materiais Restauradores do Canal Radicular/farmacologia , Acetilcisteína/farmacologia , Western Blotting , Linhagem Celular , Núcleo Celular/efeitos dos fármacos , Forma Celular/efeitos dos fármacos , Sobrevivência Celular/efeitos dos fármacos , Inibidores de Ciclo-Oxigenase 2/farmacologia , Citoplasma/efeitos dos fármacos , Relação Dose-Resposta a Droga , Eugenol/administração & dosagem , Técnica Direta de Fluorescência para Anticorpo , Sequestradores de Radicais Livres/farmacologia , Humanos , Microscopia Confocal , NF-kappa B/antagonistas & inibidores , Osteoblastos/enzimologiaRESUMO
The purpose of this study was to assess the canal anatomy and morphology of mandibular first premolars in a Chinese population. Eighty-two extracted mandibular first premolars with intact roots were collected and stored in a glutaraldehyde solution. The teeth were embedded in clear resin and the root length was measured. The roots were resected perpendicular to the long axis at 3, 6, 9, and 12 mm from the apex. The resected root surfaces were polished, rinsed, dried, and stained with methylene blue. Digital photographs of the cross-sectional root surfaces were made at 24X. The incidence of multiple canals and varied morphology was determined by two independent examiners. The results indicated that 54% of the mandibular first premolars demonstrated a single canal. Twenty-two percent contained two canals and 18% percent had C-shaped configuration. The C-shaped root canal occurred predominantly in the 3 and 6 mm sections with one or two canals coronally. A unique finding was the circumferential canal (apical delta), which was characterized by a single canal splitting into 3 or 4 canals. The incidence of circumferential canal was 6% and occurred only in the apical 3 mm cross-sections. Identification of this unique apical canal configuration and the high incidence of multiple canals in mandibular first premolars may explain endodontic treatment failure in this tooth group.
Assuntos
Dente Pré-Molar/patologia , Cavidade Pulpar/patologia , Anatomia Transversal , China , Corantes , Humanos , Processamento de Imagem Assistida por Computador/métodos , Mandíbula , Azul de Metileno , Odontometria , Fotografação , Ápice Dentário/patologia , Colo do Dente/patologia , Raiz Dentária/patologiaRESUMO
This case report presents an uncommon case of a two-rooted maxillary central incisor with a periapical radiolucent lesion. A 17-yr-old female patient was referred for dental consultation after a motorcycle accident. The maxillary left central incisor had a bifurcated root that was confirmed by radiographs taken at different angles. Nonsurgical endodontic therapy was performed. At the 1 yr recall examination, the tooth was asymptomatic and the radiograph showed that the periapical radiolucent lesion had healed.
Assuntos
Cavidade Pulpar/anatomia & histologia , Tratamento do Canal Radicular , Raiz Dentária/anatomia & histologia , Adolescente , Feminino , Humanos , Incisivo , Maxila , Periodontite Periapical/terapiaRESUMO
BACKGROUND/PURPOSE: There is large variation in root canal morphology and undetected canals and incomplete instrumentation are reasons for root canal treatment failure. The purpose of this study was to determine the best radiographic method for determining root canal morphology in mandibular first premolars in Chinese descendants in Taiwan. MATERIALS AND METHODS: Mandibular first premolars extracted due to caries, periodontal diseases, trauma, or for orthodontic reasons were used. Four indices were examined: (1) root canal bifurcation observed in the buccolingual view; (2) root canal continuity in the buccolingual view; (3) double root outline in the buccolingual view; and (4) Vertucci canal classification in the mesiodistal view. RESULTS: A total of 82 left and right mandibular first premolars were included, a complicated root canal was confirmed in 38 (46.3%) by cross-sectional imaging and a single root canal was found in 44 (53.7%). Bifurcation identified on the mesiodistal view exhibited the highest sensitivity (94.7%) and second highest specificity (88.6%) for identifying a complicated root canal; however, this view is not possible to obtain clinically. Canal bifurcation on the buccolingual view was the most specific (93.2%), but had the lowest sensitivity (73.7%). Canal continuity on the buccolingual view had a sensitivity of 94.7%, and specificity of 70.5%. CONCLUSION: Combined X-ray analyses, such as performing the buccolingual view for identification of canal bifurcation and canal continuity, may increase the accuracy of identifying complex root canal morphology.
RESUMO
The endodontic treatment of teeth with severe Type 3 dens invaginatus, characterized by an infolding of enamel and dentin, extending deep into the pulp cavity near the root apex, may be complicated and challenging. Because of the bizarre root canal anatomy and widely open apex, a combination of nonsurgical and surgical endodontic treatment or extraction is the most common choice of therapy. This article describes a nonsurgical endodontic treatment of a tooth with severe Type 3 dens invaginatus and an associated large periradicular lesion. After complete removal of the invaginated central mass of hard tissue and long-term calcium hydroxide treatment, nonsurgical endodontic treatment was performed. Complete healing of the periradicular lesion was observed at 25-month and 74-month follow-up examinations.