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1.
BMC Oral Health ; 19(1): 14, 2019 01 14.
Artigo em Inglês | MEDLINE | ID: mdl-30642318

RESUMO

BACKGROUND: To determine the root canal morphology of human permanent maxillary and mandibular teeth in a Malaysian subpopulation using cone-beam computed tomography (CBCT). METHODS: A total of 208 CBCT images were examined retrospectively. Prevalence of an extra root/canal and internal morphology based on Vertucci's classification were observed in human maxillary and mandibular permanent teeth. Variations in the external and internal morphology were compared in relation to gender and tooth side (left vs right) using Pearson Chi-square and Fisher's exact tests with significance level set at p < 0.05. RESULTS: In the maxillary arch, the prevalence of three canals were observed in 0.3% of first premolars and two canals in 46.5% of second premolars. Males displayed significantly higher prevalence of two canals in maxillary second premolars than females (p < 0.05). The prevalence of a second mesiobuccal canal in maxillary first and second molars were 36.3 and 8.5%, respectively. Males displayed significantly higher prevalence of a second mesiobuccal canal in maxillary second molars than females (p < 0.05). The prevalence of a second palatal canal in maxillary first and second molars were 0.9 and 0.6%, respectively. In the mandibular arch, the prevalence of two canals were observed in 5.1% of central incisors, 12.3% of lateral incisors, 6.1% of canines, 18.7% of first premolars and 0.5% of second premolars. The prevalence of a middle mesial canal, second distal canal and extra root (radix entomolaris) were detected in 1.9, 19.5 and 21.4% of mandibular first molars, respectively. The prevalence of a C-shaped canal was observed in 48.7% of mandibular second molars. Females displayed significantly higher prevalence of a C-shaped canal in the right mandibular second molars than males (p < 0.05). No other statistically significant differences in root anatomy and root canal morphology were observed in relation to gender and tooth side. CONCLUSIONS: Wide variations in the root canal morphology exist among Malaysians. CBCT is a clinically useful tool in the identification of external and internal morphological variations in the human teeth.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Cavidade Pulpar/diagnóstico por imagem , Dentição Permanente , Dente Molar/anatomia & histologia , Dente Molar/diagnóstico por imagem , Raiz Dentária/anatomia & histologia , Raiz Dentária/diagnóstico por imagem , Adulto , Feminino , Humanos , Malásia , Masculino , Estudos Retrospectivos
2.
Braz. j. oral sci ; 15(1): 45-50, Jan.-Mar. 2016. tab
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-831001

RESUMO

Aim: A retrospective clinical audit was carried out on records of endodontic treatment performed bydental undergraduates. The audit was performed to evaluate the technical quality of root canal fillingsperformed by dental undergraduates and determine the associated factors. Methods: 140 records ofpatients who had received root canal treatment by dental undergraduates were evaluated throughperiapical radiographs by two examiners (ê=0.74). The root canal fillings had their quality evaluatedaccording to extent, condensation and presence of procedural mishap. Possible factors associatedwith technical quality such as tooth type, canal curvature, student level and quality of record keepingwere evaluated. Data were statistically analyzed using chi-square test (p<0.05). Results: Amongthe 140 root-filled teeth, acceptable extent, condensation and no-mishap were observed in 72.1%,66.4% and 77.9% cases respectively. Overall, the technical quality of 68 (48.6%) root-filled teethwas considered acceptable. Overall, non-acceptable root canal fillings were significantly morelikely to be observed in molars (69.2%), moderately and severely curved canals (71.4%) and juniorstudents (61.5%). There was no association between acceptable root canal fillings and quality ofrecord keeping. Conclusions: The technical quality of root canal fillings was acceptable in 48.6%cases and it was associated with tooth type, degree of canal curvature and student seniority.


Assuntos
Humanos , Masculino , Feminino , Cavidade Pulpar , Endodontia , Tratamento do Canal Radicular , Estudantes de Odontologia
3.
BMC Complement Altern Med ; 15: 357, 2015 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-26467757

RESUMO

BACKGROUND: The implementation of new public healthcare models that stimulate the use of natural products from traditional medicine, as a so-called integrated medicine, refers to an approach that use best of both conventional medicine and traditional medicine. Propolis is a widely used natural product by different ancient cultures and known to exhibit biological activities beneficial for health. The large number of studies conducted with propolis had shown that its chemical composition differs as a function of the climate, plant diversity and bee species and plays an important role on its therapeutic properties. The aim of this study was to analyse the phytochemical profile of the ethanolic extract of red propolis (EEP) and its fractionation, antioxidant action of EEP and its fractions hexane, cloroform and ethyl acetate and cytotoxic activity of EEP on human tumour cell lines SF-295 (glioblastoma), OVCAR-8 (ovary) and HCT-116 (colon). METHODS: EEP was obtained by maceration with absolute ethanol, then it was concentrated in rotaevaporator up to complete evaporation of the solvent. The crude extract was fractionated with hexane, ethyl acetate, chloroform and methanol and they were subjected to phytochemical screening and total phenolic compounds. Antioxidant activity of EEP and fractions was done by means of the 2,2-diphenyl-1-picryhydrazyl (DPPH) method. Biomarkers of red propolis were identified by LC-Orbitrap-FTMS. To assess cytotoxic activity of the extract, cells were exposed to EEP over 72 h. Cell viability was assessed by means of MTT assay. The percentage of cell growth inhibition (IC50) was analysed by means of non-linear regression, and the absorbance values of the various investigated concentrations were subjected to one-factor analysis of variance (ANOVA) followed by Tukey's or Tamhane's tests (α = 0.05). RESULTS: The results obtained using phytochemical screening and LC-Orbitrap-FTMS indicated the presence of phlobaphene tannins, catechins, chalcones, aurones, flavonones, flavonols, xanthones, pentacyclic triterpenoids and guttiferones in Brazilian red propolis. EEP and its hexane, chloroform and ethyl acetate fractions obtained by liquid-liquid partitioning exhibited satisfactory antioxidant percentages. EEP (IC50 < 34.27 µg/mL) exhibited high levels of cytotoxicity on all human tumour cell lines tested when compared to negative control. CONCLUSIONS: C-Orbitrap-FTMS was useful to establish the chemical profile of the red propolis. Brazilian red propolis has antioxidant properties and decreases substantially the percentage of cell survival of human tumour cells; thus, it has potential to serve as an anticancer drug.


Assuntos
Linhagem Celular Tumoral/efeitos dos fármacos , Compostos Fitoquímicos/química , Compostos Fitoquímicos/farmacologia , Própole/química , Própole/farmacologia , Antineoplásicos/farmacologia , Antioxidantes/farmacologia , Sobrevivência Celular/efeitos dos fármacos , Humanos , Extratos Vegetais/química , Extratos Vegetais/farmacologia
4.
BMC Complement Altern Med ; 15: 294, 2015 Aug 25.
Artigo em Inglês | MEDLINE | ID: mdl-26303848

RESUMO

BACKGROUND: To evaluate and compare the effects of ethanolic extracts of Malaysian propolis and Brazilian red propolis at different concentrations on the migration and proliferation of fibroblast cells. METHODS: Malaysian and Brazilian red propolis crude samples were extracted using ethanol. Their wound healing effects were tested in vitro on the normal human fibroblast cell line CRL-7522. Cell migration and proliferation assays were carried out using propolis concentrations of 1, 10, 100, 250, 500 and 1000 µg/mL. The data were analyzed using one-way ANOVA and post hoc Bonferroni tests (α=0.05). RESULTS: Malaysian and Brazilian red propolis followed a concentration-dependent increasing and decreasing trend. Malaysian propolis showed the fastest migration rate at 250 µg/mL which was statistically significant (p<0.05) and maximum proliferation at 500 µg/mL with no significant difference (p>0.05) compared to control. Brazilian red propolis showed a slight increase in migration and proliferation at 10 and 100 µg/mL, respectively with no significant difference (p>0.05) compared to control, while concentrations above these conferred inhibitory effects. CONCLUSION: Malaysian and Brazilian red propolis show potential to assist in wound healing, depending on their concentration.


Assuntos
Fibroblastos/efeitos dos fármacos , Própole/farmacologia , Cicatrização/efeitos dos fármacos , Brasil , Linhagem Celular , Movimento Celular/efeitos dos fármacos , Humanos , Malásia
5.
J Indian Soc Pedod Prev Dent ; 33(3): 245-9, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-26156281

RESUMO

AIM: The aim of this in vitro study was an attempt to investigate the effect of different surface treatments on the bond strength between pre-existing composite and repair composite resin. MATERIALS AND METHODS: Forty acrylic blocks were prepared in a cuboidal mould. In each block, a well of 5 mm diameter and 5 mm depth was prepared to retain the composite resin (Filtek™ Z350, 3M/ESPE). Aging of the composite discs was achieved by storing them in water at 37°C for 1 week, and after that were divided into 5 groups (n = 8) according to surface treatment: Group I- 37% phosphoric acid, Group II-10% hydrofluoric acid, Group III-30% citric acid, Group IV-7% maleic acid and Group V- Adhesive (no etchant). The etched surfaces were rinsed and dried followed by application of bonding agent (Adper™ Single Bond 2. 3M/ESPE). The repair composite was placed on aged composite, light-cured for 40 seconds and stored in water at 37°C for 1 week. Shear bond strength between the aged and the new composite resin was determined with a universal testing machine (crosshead speed of 0.5 mm/min). STATISTICAL ANALYSIS: The compressive shear strengths were compared for differences using ANOVA test followed by Tamhane's T2 post hoc analysis. RESULTS: The surface treatment with 10% hydrofluoric acid showed the maximum bond strength followed by 30% citric acid, 7% maleic acid and 37% phosphoric acid in decreasing order. CONCLUSION: The use of 10% hydrofluoric acid can be a good alternative for surface treatment in repair of composite resin restoration as compared to commonly used 37% orthophosphoric acid.


Assuntos
Resinas Compostas/química , Colagem Dentária/métodos , Ácido Fluorídrico/química , Ácido Cítrico/química , Maleatos/química , Teste de Materiais , Ácidos Fosfóricos/química , Resistência ao Cisalhamento , Propriedades de Superfície
6.
Artigo em Inglês | MEDLINE | ID: mdl-25767760

RESUMO

Endodontic disease is a biofilm-mediated infection, and primary aim in the management of endodontic disease is the elimination of bacterial biofilm from the root canal system. The most common endodontic infection is caused by the surface-associated growth of microorganisms. It is important to apply the biofilm concept to endodontic microbiology to understand the pathogenic potential of the root canal microbiota as well as to form the basis for new approaches for disinfection. It is foremost to understand how the biofilm formed by root canal bacteria resists endodontic treatment measures. Bacterial etiology has been confirmed for common oral diseases such as caries and periodontal and endodontic infections. Bacteria causing these diseases are organized in biofilm structures, which are complex microbial communities composed of a great variety of bacteria with different ecological requirements and pathogenic potential. The biofilm community not only gives bacteria effective protection against the host's defense system but also makes them more resistant to a variety of disinfecting agents used as oral hygiene products or in the treatment of infections. Successful treatment of these diseases depends on biofilm removal as well as effective killing of biofilm bacteria. So, the fundamental to maintain oral health and prevent dental caries, gingivitis, and periodontitis is to control the oral biofilms. From these aspects, the formation of biofilms carries particular clinical significance because not only host defense mechanisms but also therapeutic efforts including chemical and mechanical antimicrobial treatment measures have the most difficult task of dealing with organisms that are gathered in a biofilm. The aim of this article was to review the mechanisms of biofilms' formation, their roles in pulpal and periapical pathosis, the different types of biofilms, the factors influencing biofilm formation, the mechanisms of their antimicrobial resistance, techniques to identify biofilms.

7.
BMC Oral Health ; 14: 53, 2014 May 13.
Artigo em Inglês | MEDLINE | ID: mdl-24886335

RESUMO

BACKGROUND: To investigate the antifungal activity of propolis, triple antibiotic paste (TAP), 2% chlorhexidine gel and calcium hydroxide with propylene glycol on Candida albicans-infected root canal dentinal tubules at two different depths (200 µm and 400 µm) and two time intervals (day 1 and 7). METHODS: A total of 90 extracted human teeth were sectioned below the cementoenamel junction and the apical part of the root to obtain 6 mm of the middle third of the root. The root canal was enlarged to an internal diameter of 0.9 mm using Pesso Reamer size no. 2 (Mani®, UT, Japan), followed by canal irrigation and autoclaved. The specimens were infected for 21 days with C. albicans. Then, the specimens were divided into five groups prior to placement of intracanal medicaments. Group 1 (propolis), Group 2 (triple antibiotic paste), Group 3 (2% chlorhexidine Gel), Group 4 (calcium hydroxide with propylene glycol), and Group 5 (sterile saline as negative control). At the end of 1 and 7 days, dentine shavings were collected at two depths into the dentinal tubules (200 µm and 400 µm), and the total numbers of colony forming units were calculated for assessing the remaining vital viable fungal population. The values were analysed statistically using non-paramatric Kruskal-Wallis and Mann-Whitney-U tests to compare the median reduction of Candida albicans between all intracanal medicaments. Probability values of P < 0.05 were set as the reference for statistically significant results. RESULTS: The reduction in number of colony forming units was statistically significant in all groups compared to the control group (sterile saline), except propolis at day 1 (400 µm depth). CONCLUSION: Propolis was less effective than triple antibiotic paste, 2% chlorhexidine gel and calcium hydroxide with propylene glycol against C. albicans on day 1 at 400 µm deep inside the dentinal tubules, but equally effective after 7 days at both depths.


Assuntos
Antifúngicos/farmacologia , Candida albicans/efeitos dos fármacos , Irrigantes do Canal Radicular/farmacologia , Antibacterianos/farmacologia , Anti-Infecciosos/farmacologia , Anti-Infecciosos Locais/farmacologia , Hidróxido de Cálcio/farmacologia , Clorexidina/farmacologia , Ciprofloxacino/farmacologia , Contagem de Colônia Microbiana , Cavidade Pulpar/microbiologia , Dentina/microbiologia , Combinação de Medicamentos , Humanos , Técnicas In Vitro , Metronidazol/farmacologia , Viabilidade Microbiana , Minociclina/farmacologia , Própole/farmacologia , Propilenoglicol/farmacologia , Fatores de Tempo
8.
Oral Health Dent Manag ; 13(1): 120-6, 2014 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-24603928

RESUMO

OBJECTIVES: To evaluate and compare microleakage around class V cavities restored with silorane and dimethacrylate-based composite resins. METHODS: Standard Class V cavities were prepared on the buccal surface of 60 non-carious human molars. Teeth were randomly divided into 3 groups (n=20) depending on the restorative materials used, Silorane-based composite resin (Filtek P90-SIL), dimethacrylate-based composite resin (Solare P-SOLP) and light-cure glass ionomer cement (GC Fuji II LC -LCGIC). The restored teeth with these tooth-coloured restorative materials were thermo-cycled and then immersed in 2% Rhodamine B dye under vacuum pressure for 48 hours. All teeth were bisected longitudinally in a bucco-lingual direction and observed under stereo-microscope at 30X magnification for the evidence of dye penetration. The data were analysed using one-way analysis of variance (ANOVA) and Tukey's Post Hoc tests (α=0.05). RESULTS: SIL composite resin showed the least microleakage in Class V cavity restorations with a statistically significant difference to SOLP and LCGIC. Sixty five percent of specimens in SIL group, 30% in SOLP group and 5% in LCGIC group showed dye penetration up to one-third of the cavity depth, while 5% in SIL group, 5% in SOLP group and 35% in LCGIC group showed dye penetration up to two-thirds of the cavity depth, and 30% in SIL group, 65% in SOLP group and 60% in LCGIC group showed dye penetration up to the axial wall. CONCLUSIONS: Silorane-based composite exhibited least microleakage in restoring class V cavities compared to dimethacrylate-based composite resin and light-cured glass ionomer cement.

9.
J Conserv Dent ; 17(1): 65-9, 2014 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-24554865

RESUMO

BACKGROUND: The radiopacity of contemporary adhesive systems has been mentioned as the indication for replacement of restorations due to misinterpretation of radiographic images. AIMS: This study aimed to evaluate the radiopacity of contemporary bonding agents and to compare their radiodensities with those of enamel and dentin. METHODS AND MATERIALS: To measure the radiopacity, eight specimens were fabricated from Clearfil SE Bond (CF), Xeno V (XE), Adper SE Bond (ASE), Magic Bond (MB), Single Bond 2 (SB), Scotchbond Multipurpose (SM), and gutta-percha (positive control). The optical densities of enamel, dentin, the bonding agents, gutta-percha, and an aluminium (Al) step wedge were obtained from radiographic images using image analysis software. STATISTICAL ANALYSIS: The radiographic density data were analyzed statistically by analysis of variance and Tukey's test (α =0.05). RESULTS: Significant differences were found between ASE and all other groups tested and between XE and CF. No statistical difference was observed between the radiodensity of 1 mm of Al and 1 mm of dentin, between 2 mm of Al and enamel, and between 5 mm of Al and gutta-percha. Five of the six adhesive resins had radiopacity values that fell below the value for dentin, whereas the radiopacity of ASE adhesive was greater than that of dentin but below that of enamel. CONCLUSION: This investigation demonstrates that only ASE presented a radiopacity within the values of dentin and enamel. CF, XE, MB, SB, and SM adhesives are all radiolucent and require alterations to their composition to facilitate their detection by means of radiographic images.

10.
BMC Oral Health ; 13: 52, 2013 Oct 07.
Artigo em Inglês | MEDLINE | ID: mdl-24098931

RESUMO

BACKGROUND: This study compared the effectiveness of a Specially Designed Paste Carrier technique with the Syringe-Spreader technique and the Syringe-Lentulo spiral technique in the intracanal placement of calcium hydroxide. METHODS: Three groups, each containing 15 single-rooted human anterior teeth were prepared using standardized Mtwo rotary instruments to a master apical file size 40 with 0.04 taper. Each group was filled with calcium hydroxide paste using: Syringe and #25 finger spreader (Group 1); Syringe and #4 rotary Lentulo spiral (Group 2), Specially Designed Paste Carrier (Group 3). Using pre-filling and post-filling radiographs in buccolingual and mesiodistal planes, the radiodensities at 1 mm, 3 mm, 5 mm, and 7 mm from the apical foramen were analyzed by ANOVA and Bonferroni post hoc tests. RESULTS: Overall, The Specially Designed Paste Carrier technique showed a statistically significantly higher mean radiodensity than the two other compared techniques. No significant difference was detected between the Syringe-Lentulo spiral and the Syringe-Spreader techniques. CONCLUSION: The Specially Designed Paste Carrier technique was more effective than the Syringe-Spreader technique and the Syringe-Lentulo spiral technique in the intracanal placement of calcium hydroxide.


Assuntos
Hidróxido de Cálcio/administração & dosagem , Materiais Restauradores do Canal Radicular/uso terapêutico , Obturação do Canal Radicular/instrumentação , Obturação do Canal Radicular/métodos , Análise de Variância , Hidróxido de Cálcio/uso terapêutico , Cavidade Pulpar/diagnóstico por imagem , Humanos , Radiografia , Estatísticas não Paramétricas
11.
RGO (Porto Alegre) ; 61(2)abr.-jun. 2013. ilus
Artigo em Português | LILACS | ID: lil-689475

RESUMO

Successful root canal therapy requires a thorough knowledge of root anatomy and root canal morphology which may be quiet variable. The significance of internal root canal morphology has been emphasized by studies demonstrating that variations in canal morphology may affect the endodontic outcome. Consequently, in treating each tooth the clinician must assume that complex anatomy occurs often enough to be considered normal. Root dilaceration is one of the variations that may complicate the endodontic therapy. It is important for a clinician to have complete knowledge of internal anatomy relationships, careful interpretation of radiographs; proper access preparationand a detailed exploration of the interior of the tooth to achieve a successful treatment outcome. This paper reports successful endodontictherapy of severe dilaceration of the root of mandibular first molar and bayonet shaped root of maxillary first premolar and highlights theclinical considerations to be followed during the endodontic procedures to get the successful outcome.


Um tratamento de canal bem sucedido requer conhecimento profundo da anatomia da raiz dentária e morfologia do canal radicular, que pode ser variável. A importância da morfologia interna do canal radicular tem sido enfatizada por estudos que demonstram que as variações na morfologia do canal podem afetar o resultado do tratamento endodôntico. Consequentemente, no tratamento de cada dente, o clínico deve assumir que uma anatomia complexa ocorre com frequência suficiente para ser considerada normal. A dilaceração da raiz dentária é uma das variações que podem complicar o tratamento endodôntico. É importante para o clínico ter conhecimento completo das relações da anatomia interna, fazer uma interpretação cuidadosa de radiografias; preparar adequadamente o acesso e realizar uma exploração detalhada do interior do dente para conseguir um resultado de tratamento bem sucedido. Este artigo relata casos de terapia endodôntica bem sucedida de dilaceração severa da raiz do primeiro molar inferior e de raiz em forma de baioneta de um primeiro pré-molar superior e destaca as considerações clínicas a serem seguidas durante os procedimentos endodônticos para se obter êxito no tratamento.


Assuntos
Humanos , Feminino , Cavidade Pulpar , Tratamento do Canal Radicular , Raiz Dentária
12.
J Conserv Dent ; 16(3): 224-8, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23833455

RESUMO

BACKGROUND: Among the advice on prevent cross-infection was included usage of mechanical barriers on tips of photoactivation units. However, questions about the use of protective barriers placed on the light-curing unit's tips and the possibility of interference with the ability of guaranteeing an effective polymerization of composite resins need to be clarified. AIMS: The aim of this study was to evaluate the effect of cross infection control barriers used on the light-curing device tips on the cure depth of composite resin. MATERIALS AND METHODS: Power density measurements from the light-cure unit were recorded with a radiometer on ten separate occasions with different types and placement modes of each barrier (low-density polyethylene and polyvinyl chloride (PVC) film - smooth and folds) and no-barrier (control). Cure depth of TPH™ Spectrum™ resin, A2-A4, was evaluated by the scraping test. STATISTICAL ANALYSIS: The data were analyzed using Student's t-test or ANOVA one-way with Tukey's test (α =0.05). RESULTS: Same type of barrier and different shades (A2, A4) of composite exhibited significant difference in the cure depth among all groups (P < 0.05). Both low-density polyethylene and PVC film folded barriers produced a significant reduction in the light intensity (P < 0.05). CONCLUSIONS: Regarding the resin shade, there was a significant reduction in the cure depth of A4 composite resin (dark shade) but this reduction is not enough to cause any adverse effect on the material's clinical performance. Therefore, disposable barriers can be recommended for use over the end of the light guide.

13.
J Dent Educ ; 76(3): 366-71, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22383607

RESUMO

Teaching and learning activities in the dental clinic or hospital are a challenging area for students as well as teachers. With various teaching methodologies being used in dental schools around the world, gaining greater understanding of students' attitudes toward these methodologies would be useful for dental educators. The objective of this study was to explore the preferences of dental students in India about various aspects of lecture courses. A structured survey consisting of ten closed-ended questions was developed, and 2,680 undergraduate students from forty-three dental schools in India were approached via e-mail with a follow-up postal mailing. Of these, 1,980 students responded, for a response rate of 73.8 percent. Most of the students reported preferring lectures with the aid of PowerPoint and chalkboard. They preferred morning lectures from 8 am to 10 am for a maximum of thirty to forty minutes for each lecture, and they preferred to receive information about the lecture topic in advance. The students said that delivery of clinical demonstrations was beneficial after the lectures, and they preferred learning-based rather than exam-oriented education. The respondents also said that attendance should be made compulsory and that numerical marking of examinations should not be replaced by a grading system.


Assuntos
Atitude , Educação em Odontologia , Estudantes de Odontologia/psicologia , Ensino/métodos , Recursos Audiovisuais , Avaliação Educacional/métodos , Correio Eletrônico , Retroalimentação , Humanos , Índia , Aprendizagem , Satisfação Pessoal , Aprendizagem Baseada em Problemas , Inquéritos e Questionários , Fatores de Tempo
14.
Aust Endod J ; 38(1): 36-41, 2012 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-22432825

RESUMO

Taurodontism is a morpho-anatomical developmental anomaly rarely seen in teeth. It is characterised by lack of constriction at the level of cementoenamel junction with elongated pulp chambers and apical displacement of bifurcation or trifurcation of roots. This gives the tooth a rectangular or cylindrical appearance. This paper reports successful endodontic therapy of cases with hypo-, meso- and hypertaurodontism in healthy individuals with no associated syndrome or anomaly.


Assuntos
Cavidade Pulpar/anormalidades , Tratamento do Canal Radicular/métodos , Anormalidades Dentárias/terapia , Raiz Dentária/anormalidades , Adulto , Feminino , Humanos , Masculino , Anormalidades Dentárias/cirurgia
15.
J Conserv Dent ; 14(3): 221-4, 2011 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-22025821

RESUMO

Supernumerary paramolars are the rare anomalies of the maxillofacial complex. These are more common in the maxilla than in the mandible. This article reviews the etiology, frequency, classification, complications, diagnosis and management of supernumerary teeth (bilateral maxillary paramolars).

16.
Indian J Dent Res ; 22(2): 252-5, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21891895

RESUMO

AIM: In an effort to minimize tooth preparation, yet provide additional retention to compromised tooth structure, bonded amalgam restorations were introduced. Various resin-based adhesives have been tried earlier under bonded amalgam restorations. Still there are controversies regarding the outcome of bonded amalgam restorations regarding their adaptability to the tooth structure and microleakage. Therefore, this study was undertaken to compare the microleakage of bonded amalgam restorations using different adhesive materials. MATERIALS AND METHODS: Standard Class I cavities were prepared on occlusal surfaces of 60 human molars. Teeth (n=60) were divided into three groups according to the material employed, as follows: group I: amalgam with glass ionomer cement (GIC) (type I); group II: amalgam with resin cement (Panavia F 2.0) and group III: amalgam with Copalex varnish as a control. Following restoration, the teeth were submitted to thermal cycling. The teeth were subsequently immersed in 2% rhodamine B dye under vacuum for 48 hours and sectioned to allow the assessment of microleakage under stereomicroscope. RESULTS: The values were tabulated and the results were statistically analyzed using analysis of variance (ANOVA), Tukey's post hoc test and Kruskal-Wallis test. Amalgam with type I GIC showed the least leakage with no statistically significant difference (P value 0.226) when compared to amalgam with Panavia F 2.0 and amalgam with varnish (P value 0.107). CONCLUSION: It can be concluded that bonded amalgam with type I GIC is a good alternative to amalgam with resin cement (Panavia F 2.0) and amalgam with varnish for large restorations, with the added advantages of GICs. CLINICAL SIGNIFICANCE: Bonded amalgam restorations prevent over-preparation and reduce the tooth flexure. GIC type I under amalgam provides chemical bonding in between amalgam and tooth structure and thus reduces the microleakage.


Assuntos
Amálgama Dentário/química , Colagem Dentária , Cimentos Dentários/química , Infiltração Dentária/classificação , Restauração Dentária Permanente/métodos , Corantes Fluorescentes , Forramento da Cavidade Dentária/métodos , Preparo da Cavidade Dentária/métodos , Adaptação Marginal Dentária , Retenção em Prótese Dentária/métodos , Cimentos de Ionômeros de Vidro/química , Humanos , Teste de Materiais , Dente Molar , Cimentos de Resina/química , Rodaminas , Propriedades de Superfície , Temperatura , Fatores de Tempo , Vácuo
17.
Compend Contin Educ Dent ; 32(5): 26-34; quiz 36, 38, 2011 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-21755893

RESUMO

Gingival displacement is critical for obtaining accurate impressions for the fabrication of fixed restorations, especially when the finish line is at or just within the gingival sulcus. Displacement of the gingival tissue is also important when dealing with the restoration of cervical lesions due to their proximity to the periodontal tissue. The methods of gingival tissue displacement can be broadly classified as nonsurgical and surgical techniques, with nonsurgical being the more commonly practiced method. Dentists must alter their armamentarium and gingival displacement techniques to meet specific demands and obtain predictable results. Hence, the purpose of this article is to describe the different means by which nonsurgical gingival displacement can be achieved effectively under a variety of clinical situations.


Assuntos
Restauração Dentária Permanente/métodos , Gengiva/anatomia & histologia , Adstringentes/uso terapêutico , Cimentos Dentários/química , Materiais para Moldagem Odontológica/química , Técnica de Moldagem Odontológica/instrumentação , Planejamento de Prótese Dentária , Epinefrina/uso terapêutico , Desenho de Equipamento , Hemostáticos/uso terapêutico , Humanos , Diques de Borracha , Vasoconstritores/uso terapêutico
18.
J Calif Dent Assoc ; 39(3): 167-79, 2011 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-21563596

RESUMO

Dentinal hypersensitivity is a very common clinical finding that can cause considerable concern for the patient. Clinicians must understand the various etiological factors, their complexities, and numerous treatment options available. This article reviews the etiology, management, and prevention of dentinal hypersensitivity.


Assuntos
Sensibilidade da Dentina/terapia , Polpa Dentária/inervação , Dentina/inervação , Dessensibilizantes Dentinários/uso terapêutico , Sensibilidade da Dentina/etiologia , Sensibilidade da Dentina/prevenção & controle , Humanos , Mecanotransdução Celular/fisiologia , Terminações Nervosas/fisiologia , Fibras Nervosas/fisiologia , Medição da Dor/métodos
19.
Indian J Dent Res ; 22(1): 179, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-21525705

RESUMO

OBJECTIVES: This study aims to compare the curve of Spee in human permanent healthy dentitions in two age groups to the disclusion in the premolar and molar region during protrusion. MATERIALS AND METHODS: Sixty subjects were chosen and equally divided into two age groups of 18-25 years and 35-44 years. The left side of the mandibular dental casts was photographed using a digital camera to measure the curve of Spee. The canine cusp, mesiobuccal cusp of the first molar and the distal cusp of the second molar were marked and joined to form an arc. Using AUTOCAD software, the radius for this arc was obtained. A protrusive interocclusal record was made using rigid bite registration material to measure the amount of posterior disclusion during edge to edge protrusion. A dial gauge with an accuracy of 1/100 of a millimeter was used to measure the distance between the cusp tip indentations at the region of the buccal cusp of the mandibular 2nd premolar and distobuccal cusp of mandibular 1st molar. The results obtained were statistically analyzed. RESULTS: The radius of curve of Spee increased nonsignificantly with age. The mean disclusion values measured in premolar and molar region showed a nonsignificant decrease with age. CONCLUSION: As age advances, there is a flattening of the curve of Spee and a concurrent reduction in the disclusion values during protrusion.


Assuntos
Arco Dental/anatomia & histologia , Oclusão Dentária , Registro da Relação Maxilomandibular , Mandíbula/crescimento & desenvolvimento , Maxila/crescimento & desenvolvimento , Adolescente , Adulto , Fatores Etários , Dente Pré-Molar , Cefalometria , Arco Dental/crescimento & desenvolvimento , Humanos , Mandíbula/anatomia & histologia , Maxila/anatomia & histologia , Desenvolvimento Maxilofacial , Dente Molar , Valores de Referência , Adulto Jovem
20.
J Conserv Dent ; 13(2): 71-5, 2010 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-20859478

RESUMO

OBJECTIVE: This study aims to evaluate the effect of saliva contamination on the shear bond strength of two self-etch dentine bonding systems and also investigate the effect of decontamination procedure on the recovery of bond strength. MATERIALS AND METHODS: Sixty premolars extracted for orthodontic reason were obtained and the buccal surfaces of teeth were reduced to create a flat dentine surface. The samples were randomly divided into three sub-groups for AdheSE (ASE) (Ivoclar - Vivadent, Schaan, Liechtenstein) and three sub-groups for Adper Prompt Self-Etch Adhesive (ADP) (3M ESPE, St Paul, MN, USA) of 10 each. For AdheSE (ASE); ASE-I was the control group (primer applied to fresh dentine surface), ASE-II was the contamination group (primer applied, followed by saliva contamination and then air dried) and ASE-III was the decontamination group (primer applied, followed by saliva contamination, air dried and then primer reapplied). For Adper Prompt (ADP); ADP-I was the control group (self-etch adhesive applied to fresh dentine surface), ADP-II was the contamination group (self-etch adhesive applied, followed by saliva contamination and then air dried) and ADP-III was the decontamination group (self-etch adhesive applied, followed by saliva contamination, air dried and then self-etch adhesive reapplied). Followed by the bonding procedure, a 5 mm composite resin block with Filtek P-60 (3M ESPE, St Paul, MN, USA) was built on the substrate. Shear bond strength (SBS) was tested with Instron Universal testing machine (Instron Corporation, Canton, MA, USA) with a cross head speed of 1 mm per minute. Data obtained was subjected to one way ANOVA test, while the inter group comparison was made using Tukey's multiple comparison and Unpaired t-test. RESULTS: In AdhSE group (ASE), the sub-group ASE-II (contamination group) [5.4 ± 2.2 MPa] showed lower SBS than ASE-I [11.8 ± 2.6 MPa] and ASE-III [8.9 ± 3.3 MPa], which was statistically significant. There was no significant difference in the bond strength between the ASE-I (control group) and ASE-III (decontamination group). In Adper Prompt group (ADP), there was a severe decrease of bond strength in ADP-II (contamination group) [4.6 ± 1.1 MPa] when compared to ADP-I (control group) [7.4 ± 1.4 MPa] and ADP-III (decontamination subgroup) [14.1 ± 2.2 MPa] which was statistically significant. The bond strength of ADP-III wherein Adper Prompt bonding agent was reapplied after salivary contamination was found to be statistically significant than ADP-I and ADP-II. CONCLUSION: Saliva contamination reduces the dentine bond strength of both the self-etch systems; AdheSE and Adper Prompt. Re-application of the primer for the AdheSE and re-application of the adhesive for the Adper Prompt after air drying the saliva off can recover the dentine bond strength. In the Adper Prompt group, the added application of adhesives to decontaminate saliva not only recovered the bond strength but also improved it significantly.

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