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1.
Braz. j. oral sci ; 21: e222812, jan.-dez. 2022. tab
Article in English | LILACS, BBO | ID: biblio-1348712

ABSTRACT

Aim: To evaluate the influence of the parameters L* a* b* on the variation of the color of bovine tooth enamel submitted to artificial darkening, after simulated brushing, with whitening toothpastes containing blue covarine. Methods: To undertake this study in vitro, 60 specimens (SP) were divided into 6 groups (n=10): control group (CGwater) and 5 test groups (GT1-Colgate Total 12, GT2-Oral-B 3D White Perfection, GT3- Colgate Luminous Instant White, GT4-CloseUp White Diamond Attraction, GT5-Sorriso Xtreme White). The specimens were darkened with coffee and submitted to simulated brushing for 6, 12, and 24 months. The alteration in the color was evaluated using CIELAB parameters and the ΔL, Δa, Δb and ΔE were calculated. The data was analyzed through generalized linear models using the R program and considering a level of significance of 5%. Results: The parameters L*, a* and the ΔL, Δa obtained better results in the test group than in the control group. There were no statistical differences between CG and the test groups for the evaluation of the b* parameter. In the evaluation of the Δb, the GT3 differed statistically from the CG. In relation to the ΔE, all the group tests showed a variation in color statistically greater than that of the CG and the GT4 showed the greatest variation, not differing from the GT3 during the periods studied. Conclusion: The mechanical and optical whitening agents positively influenced the values L*a* and b*, as well as in its variations and in the ΔE. It is important to emphasize, however, that to analyze tooth whitening it is necessary to evaluate their parameters together


Subject(s)
Tooth , Toothpastes , Color , Bleaching Agents
2.
Rev. Ciênc. Méd. Biol. (Impr.) ; 20(2): 333-340, set 29, 2021. fig, ilus, tab
Article in Portuguese | LILACS | ID: biblio-1354641

ABSTRACT

Introdução: os dentifrícios clareadores têm sido desenvolvidos para oferecer um melhoramento estético, porém por apresentarem maior abrasividade podem desenvolver efeitos adversos na superfície de materiais restauradores, como um aumento da rugosidade superficial, comprometendo a sobrevida das restaurações. Objetivo: analisar a rugosidade e o comportamento da massa de duas resinas compostas submetidas em laboratório à escovação com água destilada (controle) e com dentifrício abrasivo (DA) ­ Colgate Luminous White®. Metodologia: foram confeccionadas 40 amostras, 20 a partir da Resina fotopolimerizável Opallis Lab® e 20 de blocos para sistema CAD/CAM Brava Block®, divididos em quatro grupos: Opallis Lab® + água destilada, Opallis Lab® + DA, Brava Block® + água destilada, Brava Block® + DA. As amostras foram pesadas e a rugosidade aferida antes e após a escovação. Foi utilizada uma máquina de escovação em 14.690 ciclos para simulação de um ano de escovação. Os dados foram tabulados e analisados quanto à variância (ANOVA) e posteriormente realizados o teste de Tukey, comparando as médias, duas a duas. Resultados: quanto ao DA, a resina fotopolimerizável apresentou comportamento limítrofe comparado ao grupo controle, já o bloco CAD/CAM foi estatisticamente significante. Em ambos, a rugosidade reduziu no grupo controle enquanto que no grupo teste aumentou. A perda de massa apenas, foi estatisticamente significante na resina fotopolimerizável. Quando comparados os tipos de resina, não houve significância estatística quanto à rugosidade e a perda de massa. Conclusão: as resinas apresentam comportamentos semelhantes, mas os dentifrícios abrasivos não são recomendados para escovação de materiais restauradores, pois interferem negativamente na rugosidade


Introduction: whitening dentifrices have been developed to offer an aesthetic improvement, however because of their high abrasiveness, may develop adverse effects on the surface of restorative materials, may develop adverse effects on the surface of restorative materials, such as increased surface roughness, compromising the survival of restorations. Objective: analyze the roughness and mass loss of two laboratory composite resins subjected to brushing with distilled water (control) and with abrasive dentifrice (AD), Colgate Luminous White®. Methodology: were prepared 20 samples, 20 from light-curing resin Opallis Lab® and 20 from blocks for CAD/CAM system (Brava Block®), divided into four groups: Opallis Lab® + distilled water, Opallis Lab® + AD, Brava Block® + distilled water, Brava Block® + AD. The samples were weighed and the roughness measured before and after brushing. A brushing machine was used in 14,690 cycles simulating 1 year of brushing. Data were tabulated and analyzed for variance (ANOVA) and later performed the Tukey test, comparing the means, two to two. Results: as for the AD, the light-curing resin presented borderline behavior compared to the control group, when the CAD/CAM block was statistically significant. In both, the roughness decreased in the control group while in the test group it increased. The weight loss was only statistically significant in the light-cured resin. When comparing the types of resin, there wasn't statistical significance as for roughness and weight loss. Conclusion: the tested resins have similar behaviors, but abrasive dentifrices are not recommended for brushing restorative materials, because they interfere negatively in the roughness.


Subject(s)
Humans , Male , Female , Tooth Abrasion , Toothbrushing , Composite Resins , Dentifrices , Tooth , Distilled Water , Analytical Methods
3.
Rev. odontol. UNESP (Online) ; 50: e20210031, 2021. ilus
Article in English | LILACS, BBO | ID: biblio-1352131

ABSTRACT

Introduction Dental practice professionals encounter several urgency cases, mainly related to endodontic problems. To attend to these, professionals need extensive prior preclinical training, being one of the main difficulties the search for models that simulate dental morphology. Aim To compare the external morphometry of multirooted artificial teeth to literature. Material and method The artificial teeth (Upper First Premolar, Upper First Molar and Lower First Molar) were donated by the manufacturers: Fábrica de Sorrisos (FS) and IM do Brasil LTDA (IM), totaling 30 teeth. The total length of the tooth and root, height and buccal-palatal and mesial-distal dimensions of the crown were measured with a digital pachymeter. The data were placed in a spreadsheet and the statistical analysis was performed [ANOVA or Kruskal-Wallis and then, Dunnett's test (α=5%)]. Result The Upper Molar samples of the company Fábrica de Sorrisos presented all variables within the morphometric patterns described in the literature. The other dental groups presented statistically significant differences, maintaining or not a certain proportionality. Conclusion Of all the dental groups analyzed, the upper molar from the company Fábrica de Sorrisos was the only one that presented all the external morphometric aspects according to literature.


Introdução Dentro da prática odontológica, os profissionais podem receber diversos casos de urgência, principalmente relacionados a problemas endodônticos e, para atendê-los, há a necessidade de um extenso treinamento pré-clínico prévio, sendo uma das principais dificuldades a busca por modelos que simulem a morfologia dentária. Objetivo Comparar a morfometria de dentes artificiais polirradiculares à literatura. Material e método Os dentes artificiais (Primeiro Pré-molar Superior, Primeiro Molar Superior e Primeiro Molar Inferior) foram doados pelos fabricantes: Fábrica de Sorrisos (FS) e IM do Brasil Ltda. (IM), totalizando 30 dentes. Foi realizada mensuração do comprimento total do dente e o da raiz, da altura e das dimensões vestíbulo-palatina e mésio-distal da coroa, com paquímetro digital. Os dados foram dispostos em uma planilha de cálculo e realizou-se a análise estatística [ANOVA ou Kruskal-Wallis e, após, teste de Dunnett (α=5%)]. Resultado A amostra de molares superiores da empresa FS apresentou todas as variáveis dentro dos padrões morfométricos descritos na literatura. Os demais grupos dentários apresentaram diferenças estatisticamente significantes, mantendo ou não certa proporcionalidade. Conclusão De todos os grupos dentários pesquisados o molar superior da empresa FS foi o único que apresentou todos os aspectos morfométricos externos de acordo com os dados da literatura.


Subject(s)
Reference Standards , Tooth, Artificial , Analysis of Variance , Endodontics , Literature , Molar , Tooth/anatomy & histology , Statistical Analysis
4.
Article in English | LILACS, BBO | ID: biblio-1250447

ABSTRACT

ABSTRACT Objective: To test the modified Demirjian's method of dental age estimation on the South Indian population and correlate it with the patient's chronological age. Material and Methods: This retrospective radiographic study was performed on digital panoramic radiographs taken during a one-year duration. Radiographs of patients in the age range from 8 to 18 years were included in the study. The radiographs were examined and according to the stage of the crown and root status of the left side mandibular teeth. The stage of calcification was observed for eight teeth in the mandibular arch and was recorded in a specially designed proforma. Each rated tooth with stage was converted into a score using a conversion table specified for girls and boys. Results: 224 digital panoramic radiographs were retrieved from the radiologic database. Out of total study sample, 49.5% (n=111) were boys and 50.5% (n=113). The mean chronological and estimated dental age using dental maturity scores resulted in an overestimation of 3 years and eight months. Also, it was noted that there was a strong positive association between chronological (real) and dental age. Conclusion: It was observed that there was a strong correlation between chronological and dental age. A new formula for determining the chronological age from the estimated dental age was derived. Further studies on a larger population may prove the reliability of this age estimation method.


Subject(s)
Humans , Animals , Male , Female , Child , Adolescent , Tooth/growth & development , Age Determination by Teeth , Radiography, Panoramic/instrumentation , Forensic Dentistry , Retrospective Studies , Data Interpretation, Statistical , Growth and Development , Age and Sex Distribution , India/epidemiology
5.
Article in English | AIM, AIM | ID: biblio-1293231

ABSTRACT

This article presents a successful orthodontic management of a 12-year-old male using a fixed orthodontic appliance (straight wire technique). His orthodontic treatment was hinged on creating enough space to accept an artificial tooth, correcting the horizontal and vertical relationships of the upper incisors to the lower and the midline shift. Ultimately, an esthetic smile was achieved; function and self-esteem were improved when the artificial tooth was finally fixed.


Subject(s)
Humans , Tooth , Orthodontic Appliances, Fixed , Esthetics, Dental , Nigeria
6.
J. appl. oral sci ; 29: e20200955, 2021. tab, graf
Article in English | LILACS | ID: biblio-1286920

ABSTRACT

Abstract The congenital absence of multiple teeth may share the same genetic background of the development of some types of cancer. Objective: This systematic review aimed to investigate the possible association between dental agenesis and cancer, and the perspective of agenesis as an early predictor for cancer risk. Methodology: The electronic databases PubMed, Scopus, Web of Science, Cochrane Library, LILACS, and OpenGrey were searched and the risk of bias was evaluated using the Newcastle-Ottawa tool. The GRADE tool was used to evaluate the certainty of the evidence. Results: Six studies met the eligibility criteria. A positive co-occurrence between ovarian cancer and hypodontia was found in two articles. Three studies evaluated the association between dental agenesis and colorectal cancer and only one showed common genes for these conditions. One paper found individuals with hypodontia had a higher risk of family history of cancer. Five studies had a fair quality and one a good quality. The certainty of evidence was classified as very low. Conclusion: Notwithstanding the limited scientific evidence, there may be a possible association between dental agenesis and cancer due to genes involved in both conditions. Agenesis of multiple teeth could be an early indicator of cancer risk. Nevertheless, studies with a better level of evidence are needed to confirm this possible association.


Subject(s)
Tooth , Neoplasms
7.
Braz. dent. sci ; 24(2): 1-8, 2021. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1178045

ABSTRACT

Introdução: O estudo foi realizado para comparar a eficácia da retenção hidrofóbica e hidrofílica de selante de fóssulas e fissuras entre crianças de 7 a 10 anos de idade escolar. Material e métodos: O presente estudo randomizado de boca dividida foi realizado nas superfícies oclusais dos primeiros molares inferiores permanentes para comparação e avaliação da retenção junto com outras variáveis de resultado, como a cor, descoloração marginal, adaptação marginal, forma anatômica, sensibilidade pós-operatória, formação de cárie e rugosidade de superfícia de selantes hidrofóbicos e hidrofílicos de fóssulas e fissuras no 3º e 6º mês de aplicação. Os dados foram analisados usando o software SPSS e os resultados foram obtidos. Resultados: No presente estudo, entre as 50 restaurações com selantes hidrofóbico de fóssulas e fissuras (Grupo I), 48 (96%) das restaurações ficaram retidas no final do terceiro mês e 45 (90%) ficaram retidas no final do sexto mês. Entre as 50 restaurações nos selantes de fóssulas e fissuras hidrofílicas (Grupo II), 49 (98%) restaurações ficaram retidas no final do terceiro mês e 46 (92%) no final do sexto mês ficaram retidas. Não houve diferença significativa no número de restaurações totalmente retidas ao final de seis meses (p = 1,00) entre os dois grupos. A avaliação de todas as outras variáveis entre as duas intervenções mostrou que a diferença não foi estatisticamente significativa. Conclusão: O estudo concluiu que o selante de fóssulas e fissuras hidrofílico era semelhante ao selante de fóssulas e fissuras hidrofóbicas em termos de retenção, combinação de cor, descoloração marginal, adaptação marginal, forma anatômica e rugosidade de superfície. (AU)


Introduction: The study was done to compare the effectiveness of hydrophobic and hydrophilic pit and fissure sealant retention among 7-10 year old school children. Material and Methods: The present split mouth randomized trial was conducted on the occlusal surfaces of permanent first mandibular molars to compare and assess the retention along with other outcome variables like colour match, marginal discolouration, marginal adaptation, anatomic form, post-operative sensitivity, caries formation and surface roughness properties of Hydrophobic and Hydrophilic pit and fissure sealants at 3rdand 6th month. The data was compiled and analyzed using SPSS software and results were generated. Results: In the present study among the 50 restorations in the hydrophobic pit and fissure sealants (Group I), 48 (96%) restorations were retained at the end of third month and 45(90%) were retained at the end of sixth month. Among the 50 restorations in the hydrophilic pit and fissure sealants (Group II), 49(98%) restorations were retained at the end of third month, and 46(92%) at the end of sixth month were retained. There was no significant difference in the number of completely retained restorations at the end of six months (p = 1.00) among both the groups. The assessment of all the other outcome variables between both the interventions showed that the difference was not statistically significant. Conclusion: The study concluded that the hydrophilic pit and fissure sealant was similar to the hydrophobic pit and fissure sealant in terms of retention, colour match, marginal discolouration, marginal adaptation, anatomic form and surface roughness properties with (AU)


Subject(s)
Humans , Child , Pit and Fissure Sealants , Tooth , Dental Marginal Adaptation
8.
Article in Chinese | WPRIM | ID: wpr-879615

ABSTRACT

Tooth agenesis is the most common form of congenital craniofacial dysplasia seen in stomatology clinics, which may be caused by genetic and/or environmental factors. Tooth development is regulated by a series of signaling pathways, and variants in any of these strictly balanced signaling cascades can result in tooth agenesis and/or other oral defects. Notably, variants of genes of the Wnt/beta-catenin signaling pathway are important cause for both non-syndromic and syndromic tooth agenesis. This article has provided a review for the molecular genetics of tooth agenesis associated with Wnt/beta-catenin signaling pathway, which may shed lights on the etiology and molecular mechanism of this disease.


Subject(s)
Anodontia/genetics , Genetic Research , Humans , Tooth , Wnt Proteins/genetics , Wnt Signaling Pathway/genetics
9.
Article in Chinese | WPRIM | ID: wpr-878431

ABSTRACT

OBJECTIVES@#To investigate the differences in the temporomandibular joints (TMJs) between patients with anterior disc displacement with reduction (ADDwR) and asymptomatic subjects by using 3D morphometric measurements.@*METHODS@#A total of 15 patients with ADDwR and 10 asymptomatic subjects were enrolled. Then, 3D models of the maxilla and mandible were reconstructed using MIMICS 20.0. Nine morphologic parameters of TMJs on both sides were measured on the 3D solid model. The differences in the parameters were analyzed between the patients and the asymptomatic subjects and between the left and right sides of each group.@*RESULTS@#The horizontal and coronal condylar angles on the ipsilateral side of the patients were significantly greater than those of the asymptomatic subjects (@*CONCLUSIONS@#ADDwR will increase the condylar angles to be significantly greater than the normal level and decrease SRA and articular spaces to be significantly smaller than the normal level. The condyles will be displaced upward, closer to the fossa.


Subject(s)
Humans , Joint Dislocations , Magnetic Resonance Imaging , Mandible , Mandibular Condyle , Maxilla , Temporomandibular Joint , Temporomandibular Joint Disorders , Tooth
10.
Article in English | WPRIM | ID: wpr-878407

ABSTRACT

OBJECTIVES@#This study aimed to assess the influence of different types of rapid maxillary expansion on root resorption (RR).@*METHODS@#Literature searches were carried out electronically in five English and two Chinese databases. Randomized controlled trials (RCTs), controlled clinical trials (CCTs), cohort studies, and case-control studies were included. The data were extracted by three authors. The risk of bias in the RCTs and nonrandomized studies were assessed in accordance with corresponding scales.@*RESULTS@#Among the 400 articles identified, seven were included for the final analysis. Three studies were graded as high value of evidence, while two and another two studies were graded as moderate value and low value, respectively. According to the available evidence, the tooth-borne maxillary expansion caused more obvious RR of anchorage teeth than the bone-borne one. In addition, the Haas-type palatal acrylic pads could not effectively reduce the degree of RR. The difference in the design of the retainer between the tooth-borne maxillary expansion (the use of a band or wire framework to connect the anchorage tooth) did not cause the difference in the incidence and degree of RR.@*CONCLUSIONS@#Clinical evidence suggested that bone-borne maxillary expansion may decrease the amount of RR, while the amounts of resorption did not significantly differ between Haas and Hyrax and between different retainer types of Hyrax.


Subject(s)
Case-Control Studies , Humans , Maxilla , Palatal Expansion Technique , Palate , Root Resorption , Tooth
11.
Article in English | WPRIM | ID: wpr-878406

ABSTRACT

OBJECTIVES@#A study was conducted to explore the expression pattern and function of ferritin heavy polypeptide gene (fth1b) in zebrafish pharyngeal teeth development and lay the foundation for subsequent research on teeth development and mineralization.@*METHODS@#The zebrafish embryos were harvested at 56, 72, 96, and 120 h after fertilization. The expression of fth1b in zebrafish pharyngeal teeth development was detected by whole embryo @*RESULTS@#The expression pattern of fth1b gene was very similar to that of the known zebrafish pharyngeal teeth marker dlx2b and was specifically expressed in the zebrafish pharyngeal teeth during development. After the specific knockout of the gene fth1b, the earliest gene that can be detect in zebrafish pharyngeal teeth-pitx2 was expressed normally during early development. The dlx2b expression was not significantly different from that of wild type zebrafish, but the mineralization of pharyngeal teeth in the mutant was weaker than that of wild type zebrafish.@*CONCLUSIONS@#The gene fth1b is specifically expressed in zebrafish pharyngeal teeth and acts on their early mineralization.


Subject(s)
Animals , In Situ Hybridization , Odontogenesis , Pharynx , Tooth , Zebrafish/genetics
12.
Article in English | WPRIM | ID: wpr-878403

ABSTRACT

Tooth preparation is a common operation in dental clinical practice. This procedure is irreversible and invasive from the point of view of tooth preservation. Conditions of the abutment tooth, treatment methods, and restoration materials for target restoration affect tooth preparation. To achieve the goals of tooth tissue preservation, dental pulp protection, and periodontal health, dentistry professionals agreed on the importance of minimizing the amount of tooth reduction. The foundations for realizing this consensus are as follows. First, the available restoration materials with improved comprehensive performance need less target restoration space. Next, teeth can be prepared under a digital guide, and the real-time measurement of restoration space can be verified due to the invention of digital technologies for the analysis of the quantity and shape of the prepared tooth and tooth measurement. Moreover, guiding methods for preparation have been developed from freehand operation under the naked eye based on accumulated personal experience to digital-guidance jointing microscope. These innovations indicate the creation of a prototype of guided prosthodontics that is precise and applies real-time measurement throughout the process of tooth preparation. From the perspective of the evolution of digital, guided, and micro prosthodontics, this article raised seven questions about the numerical value and quantitative data transfer of tooth preparation and evaluated the authenticity of existing numerical requirements from the perspective of the four elements of measurement. Identifying unified measuring methods and developing measuring tools with a precision of hundred or ten microns will be the key to solving the problem about the authenticity of numerical measurement. Furthermore, this paper summarizes the methods of how to control tooth reduction and explains in depth why the currently dominant tooth preparation technology, which is based on empiricism, cannot effectively achieve the goals in digital prosthodontics. Therefore, we strongly call for rebuilding the digital foundation of prosthodontic treatment immediately.


Subject(s)
Prosthodontics , Tooth , Tooth Preparation
13.
Article in English | WPRIM | ID: wpr-921378

ABSTRACT

OBJECTIVES@#A study was conducted to investigate the clinical effects of oral digital design on the aesthetic restoration of anterior teeth of cleft lip/palate patients.@*METHODS@#Nine adult cleft lip/palate patients who need aesthetic restoration of anterior teeth were recruited. Digital information of patients' dental arches, the surrounding soft tissue and face were captured by digital camera and scanner. The aesthetic analysis and design were conducted using keynote and 3shape software and were demonstrated to the patients. The optimized treatment plan was ensured by communicating with the patients. Digital wax-up models were exported and printed into resin diagnostic models, which were then utilized in the treatment process to guide the doctors and the technicians in tooth preparation and in making the final restorations, respectively. The adhesive procedure was completed after satisfactory try-in. Aesthetics assessment was conducted in accordance with the anterior esthetic evaluation form. The scores of patient's satisfaction were recorded on a questionnaire containing six items of aesthetic index and doctor-patient communication. Patients were interviewed and examined after 1, 3, 6, and 12 months, respectively, and the clinical effects of restorations were evaluated.@*RESULTS@#All nine patients had satisfactory clinical results. The aesthetic defects of the patients were effectively addressed. All treatments met the requirements of the preoperative digital designs. The patients' scores were all above 90 on the satisfaction scale. At 12 months after the operation, the clinical effects of restorations of all cases achieved A class in each evaluation indicator.@*CONCLUSIONS@#For cleft lip/palate patients with esthetic defect in the anterior teeth, the digital design plays an important role in optimizing the treatment plan and guides the whole treatment process. This design can help clinicians achieve predictable satisfactory aesthetic results.


Subject(s)
Adult , Cleft Lip , Cleft Palate , Esthetics , Humans , Tooth
14.
Article in English | WPRIM | ID: wpr-880858

ABSTRACT

During embryonic development, organs undergo distinct and programmed morphological changes as they develop into their functional forms. While genetics and biochemical signals are well recognized regulators of morphogenesis, mechanical forces and the physical properties of tissues are now emerging as integral parts of this process as well. These physical factors drive coordinated cell movements and reorganizations, shape and size changes, proliferation and differentiation, as well as gene expression changes, and ultimately sculpt any developing structure by guiding correct cellular architectures and compositions. In this review we focus on several craniofacial structures, including the tooth, the mandible, the palate, and the cranium. We discuss the spatiotemporal regulation of different mechanical cues at both the cellular and tissue scales during craniofacial development and examine how tissue mechanics control various aspects of cell biology and signaling to shape a developing craniofacial organ.


Subject(s)
Cell Differentiation , Morphogenesis , Signal Transduction , Skull , Tooth
15.
Braz. j. biol ; 80(4): 783-789, Oct.-Dec. 2020. graf
Article in English | LILACS | ID: biblio-1142539

ABSTRACT

Abstract Radula in all melongeninae species is rather uniform and characterized by bicuspid lateral teeth with strongly curved cusps and sub rectangular rachidians, bearing usually 3 cusps. The aim of the present study was to describe the radula of 2 Pugilina cochlidium populations using SEM. The radula in 2 species proves itself as a rachiglossate type showing the radular formula of 1 + R + 1. The first population hasthe central tooth wide with sharp cusps equal in length, emanate from posterior margin of tooth base. The lateral teeth have 2 cusps and are long, sharp, pointed and bent towards the rachidian tooth. Whereas the second population, the central tooth is narrow with sharp cusps equal in length, emanate from posterior margin of tooth base. The lateral teeth have 2 cusps and are broad, longer, sharp, pointed and bent towards the rachidian tooth. They are typically sickle shaped with broad strong base. In both populations the rachidian tooth is subquadrate with 3 big cusps in the middle, but in the second population the base of the rachidian is concave while in the first population it is straight. In the present study the median rachidian of the second population, has a broad basal region when compared to first. This similar observation has been made in Chicoreus virgineus ponderosus and Siratus virgineus ponderosus. In the present study, since 2 populations exhibit the same generalized rachiglossate pattern it does not offer much scope for systematic diagnosis below generic level.


Resumo A rádula em todas as espécies de melongeninae é bastante uniforme e caracterizada por dentes laterais bicúspides com cúspides fortemente curvas e raquidianas sub-retangulares, portando geralmente 3 cúspides. O objetivo do presente estudo foi descrever a rádula de 2 populações de Pugilina cochlidium usando SEM. A rádula em 2 espécies mostra-se como um tipo rachiglossate mostrando a fórmula radular de 1 + R + 1. A primeira população tem o dente central largo com cúspides afiadas igual em comprimento, emana da margem posterior da base do dente. Os dentes laterais possuem 2 cúspides longas, pontiagudas, pontiagudas e dobradas em direção ao dente raquidiano. Enquanto a segunda população, o dente central estreito com cúspides afiadas igual em comprimento, emana da margem posterior da base do dente. Os dentes laterais têm 2 cúspides largas, longas, pontiagudas, pontiagudas e dobradas em direção ao dente raquidiano. Eles são tipicamente em forma de foice com ampla base forte. Em ambas as populações, o dente raquidiano é subquadrado com 3 grandes cúspides no meio, mas na segunda população a base do ráquidiano é côncava enquanto na primeira população é reta. No presente estudo, a mediana da raquidiana da segunda população apresenta uma ampla região basal quando comparada à primeira. Esta observação semelhante foi feita em Chicoreus virgineus ponderosus e Siratus virgineus ponderosus. No presente estudo, uma vez que 2 populações exibem o mesmo padrão de rachiglossato generalizado, ele não oferece muito espaço para o diagnóstico sistemático abaixo do nível genérico.


Subject(s)
Humans , Animals , Tooth , Gastropoda , Population , Bays , India
16.
Rev. Cient. CRO-RJ (Online) ; 5(1): 58-63, Jan.-Apr. 2020.
Article in English | LILACS, BBO | ID: biblio-1130177

ABSTRACT

The purpose of this case report was to describe the surgical exposure and orthodontic management of an unerupted and ectopic maxillary right central incisor after trauma to the primary predecessor. Case report: An 11-year-old girl was referred to the Pediatric Dentistry Clinic due to eruption failure of the maxillary right central incisor. Radiographs showed the impacted central incisor located below the anterior nasal spine and its apex parallel to the palatal plane and the presence of an odontoma. General surgery was performed to remove the odontoma and two perforations in the crown of the impacted tooth were made to carry out orthodontic traction. Correct alignment was achieved after 18 months and no significant clinical or radiographic alterations were founded. Conclusion: The orthodontic management was performed successfully, and a positive esthetic outcome combined with adequate occlusion demonstrated the satisfactory results of this case.


Objetivo: O objetivo deste relato de caso foi descrever a exposição cirúrgica e o tratamento ortodôntico de um incisivo central superior direito ectópico e não irrompido após trauma do predecessor decíduo. Relato do caso: Uma menina de 11 anos de idade foi encaminhada à Clínica de Odontopediatria devido ao atraso na erupção do incisivo central superior direito. As radiografias mostraram o incisivo central impactado localizado abaixo da espinha nasal anterior e seu ápice paralelo ao plano palatino e a presença de um odontoma. A cirurgia para remoção do odontoma foi realizada sob anestesia geral e duas perfurações na coroa do dente impactado foram realizadas para a tração ortodôntica. O alinhamento correto foi alcançado após 18 meses e não foram encontradas alterações clínicas ou radiográficas significativas. Conclusão: O manejo ortodôntico foi realizado com sucesso, e um resultado estético positivo combinado à oclusão adequada demonstrou os resultados satisfatórios deste caso.


Subject(s)
Orthodontics , Surgery, Oral , Tooth , Tooth Diseases , Tooth, Unerupted , Odontoma , Stomatognathic Diseases , Child , Tooth Injuries , Incisor
17.
Int. j. morphol ; 38(5): 1317-1324, oct. 2020. tab
Article in English | LILACS | ID: biblio-1134442

ABSTRACT

SUMMARY: Statistical testing methods are essential tools to measure and analyze the data obtained through research in dental morphology. This descriptive study analyzes the different statistical testing methods in order to suggest its appropriate use and manage in the interpretation and analysis of quantitative and/or qualitative data of dentistry investigations. The knowledge obtained through this study could orient students and/or interested professionals to decide, with theoretical basis, which one to use in the development of their research.


RESUMEN: Los métodos de pruebas estadísticas son herramientas esenciales para medir y analizar los datos obtenidos a través de la investigación en morfología dental. Este estudio descriptivo analiza los diferentes métodos de pruebas estadísticas con el fin de sugerir su uso apropiado y gestionarlo en la interpretación y análisis de datos cuantitativos y / o cualitativos de las investigaciones odontológicas. El conocimiento obtenido a través de este estudio podría orientar a los estudiantes y / o profesionales interesados a decidir, con base teórica, cuál utilizar en el desarrollo de su investigación.


Subject(s)
Humans , Tooth/anatomy & histology , Data Interpretation, Statistical , Cross-Sectional Studies , Statistics as Topic , Dentistry , Data Analysis
18.
Int. j. morphol ; 38(5): 1325-1329, oct. 2020. graf
Article in English | LILACS | ID: biblio-1134443

ABSTRACT

SUMMARY: To explore a new semi-automatic method to segment the teeth from the three-dimensional volume data which acquired from cone beam computed tomography (CBCT) scanner. Scanned dental cast models are used to evaluate the segmentation accuracy. The CBCT data are loaded to ORS software. Based on gray value, a semi-automatic method was used to segment teeth and then the segmented teeth were saved in STL format data. Smooth the mesh data in the Geomagic Studio software. The upper and lower dental cast models were scanned by a white light scanner and the data was saved in STL format too. After registering the model data to teeth data, the deviation between them was analyzed in the Geomagic Qualify. All teeth could be obtained, the method is simple to use and applied in orthodontic biomechanics. The entire process took less than 30 minutes. The actual measured Root Mean Square (RMS) value is 0.39 mm, less than 0.4 mm. This method can segment teeth from the jaw quickly and reliably with a little user intervention. The method has important significance for dental orthodontics, virtual jaw surgery simulation and other stomatology applications.


RESUMEN: El objetivo de este estudio fue explorar un nuevo método semiautomático para segmentar los dientes a partir de datos de volumen tridimensional adquiridos mediante escáner de tomografía computarizada de haz cónico (CBCT). Los modelos escaneados de moldes dentales se utilizan para evaluar la precisión de la segmentación. Para los datos CBCT se utilizó el software ORS, y basado en el valor gris, se usó un método semiautomático para segmentar los dientes los que posteriormente se guardaron en datos de formato STL. Los datos se ingresaron en el software Geomagic Studio. Los modelo dentales superior e inferior se escanearon con un escáner de luz blanca y la información también se guardó en formato STL. Después del registro y comparación de los datos del modelo y los datos de los dientes, la desviación entre estos se analizó en el programa Geomagic Qualify. Usando este método fue posible obtener de forma fácil todos los dientes y además aplicar en la biomecánica de ortodoncia. El proceso completo demoró menos de 30 minutos. El valor real medido de la raíz cuadrada media fue de 0,39 mm, menos de 0,4 mm. Este método puede segmentar los dientes mandibulares de forma rápida y confiable, con una mínima intervención del usuario. El método tiene una importancia crítica para la ortodoncia, simulaciones virtuales de las cirugías de la mandíbula y otras aplicaciones en estomatología.


Subject(s)
Humans , Tooth/diagnostic imaging , Image Processing, Computer-Assisted/methods , Imaging, Three-Dimensional , Cone-Beam Computed Tomography/methods , Orthodontics/methods , Tooth/anatomy & histology , Software
19.
Arq. Ciênc. Vet. Zool. UNIPAR (Online) ; 23(2, cont.): e2313, jul-dez. 2020. ilus
Article in Portuguese | LILACS, VETINDEX | ID: biblio-1141385

ABSTRACT

Heterotopic polyodontia have been described in most domestic species. Known as a dentigerous cyst but appropriately called heterotopic polyiodontics, it rarely occurs in horses, however it is easily recognized as a congenital defect. The cysts usually associated with this condition contain part or all of dental structures. The heterotopic tooth or dental structure is usually adhered to the temporal bone and surrounded by a secretory membrane, with a accumulation of exudate and draining tract along the proximal pinna or directly over the cyst. This case report describes in a 2.5-year-old female quarter horse, weighing 430 kg, with a heterotopic polyodontia that contained two easily small's identifiable dental structures, presented for evaluation of a chronic intermittent mucopurulent exudate discharge from the right sub-auricular region in the mastoid process of the temporal bone and a drainage tract near the right pinna. The diagnosis is established with clinical, radiographic, ultrasound and confirmed by histopathological examination of the structures removed. The cystic capsule was surgically removed, measuring approximately 3.0 x 2.3 cm in diameter, filled with mucopurulent exudate and containing two dental structures within 0.5 cm in diameter and 0.2 cm in diameter. Microscopic examination revealed a cystic area covered by stratified squamous epithelium with a lympho-histio-plasmatic cell infiltrate in the dermis, which was compatible with heterotopic polyodontia. Postoperatively, there were no neuromotor sequelae and wound healing evolved positively.(AU)


A poliodontia heterotópica tem sido descrita na maioria das espécies domésticas. Conhecido como cisto dentígero, mas apropriadamente denominado poliodontia heterotópica, raramente ocorre em equinos, porém é facilmente reconhecido como defeito congênito. Os cistos geralmente associados a essa condição contêm parte ou toda as estruturas dentarias. O dente heterotópico ou estrutura dentaria é comumente encontrado aderido ao osso temporal e envolvido por uma membrana secretora, com acúmulo de exsudato e trajeto de drenagem ao longo do pavilhão auricular proximal ou diretamente sobre o cisto. Este relato descreve um caso de em um equino,fêmea, quarto de milha, com 2,5 anos de idade, pesando 430 kg, com poliodontia heterotópica que continha duas estruturas dentarias facilmente indentificadas, apresentando um orifício na região sub-auricular direita no processo mastóideo do osso temporal, com secreção mucopurulenta intermitente e crônica, próximo ao pavilhão auricular direito. O diagnóstico foi estabelecido com exame clínico, radiográfico, ultrassonográfico e confirmado pelo exame histopatológico das estruturas retiradas. A cápsula cística foi removida cirurgicamente medindo aproximadamente 3,0 x 2,3 cm de diâmetro, preenchida com exsudato mucopurulento e contendo em seu interior duas estruturas dentárias medindo cerca de 0,5 cm de diâmetro e 0,2 cm de diâmetro. O exame microscópico revelou área cística revestida por epitélio escamoso estratificado com infiltrado linfo-histo-plasmocitário na derme, compatível com poliodontia heterotópica. No pós-operatório não houve sequelas neuromotoras e a cicatrização da ferida evoluiu positivamente.(AU)


La poliodontia heterotópica ha sido descrita en la mayoría de las especies domésticas. Conocido como quiste dentígero, pero apropiadamente llamado poliodontia heterotópica, raramente ocurre en equinos, sin embargo se reconoce fácilmente como un defecto congénito. Los quistes generalmente asociados a esa condición contienen parte o la totalidad de las estructuras dentales. El diente heterotópico o estructura dental se encuentra comúnmente adherido al hueso temporal y rodeado por una membrana secretora, con acumulación de exudado y vía de drenaje a lo largo del pabellón auricular proximal o directamente sobre el quiste. En este informe se describe el caso de una hembra, cuarto de milla, de 2,5 años de edad, con 430 kg de peso, presentando poliodontia heterotópica que contenía dos estructuras dentales fácilmente identificables, con un orificio en la región subauricular derecha en el proceso mastoides del hueso temporal, secreción mucopurulenta intermitente y crónica próximo al oído derecho. El diagnóstico se estableció con examen clínico, radiográfico, ecográfico y se confirmó con el examen histopatológico de las estructuras extirpadas. La cápsula quística se extrajo quirúrgicamente midiendo aproximadamente 3,0 x 2,3 cm de diámetro, rellena con exudado mucopurulento y conteniendo en su interior dos estructuras dentales que medían aproximadamente 0,5 cm de diámetro y 0,2 cm de diámetro. El examen microscópico reveló una zona quística cubierta por un epitelio escamoso estratificado con infiltrado linfo-histo-plasmocítico en la dermis, compatible con poliodontia heterotópica. En el postoperatorio no se produjeron secuelas neuromotoras y la cicatrización de la herida evolucionó positivamente.(AU)


Subject(s)
Animals , Female , Tooth , Dentigerous Cyst/diagnosis , Horses/injuries
20.
Rev. cir. traumatol. buco-maxilo-fac ; 20(3): 39-43, jul.-set. 2020. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1253321

ABSTRACT

Introdução: A Odontectomia Parcial Intencional ou Coronectomia é uma abordagem cirúrgica que consiste na remoção da porção coronária de molares mandibulares impactados e a manutenção das suas raízes no alvéolo dentário. Esta técnica é indicada quando há íntima relação entre o dente e o canal mandibular e tem por principal objetivo evitar lesões ao nervo alveolar inferior. Relato de Caso: Paciente do sexo masculino, 24 anos, ASA I, compareceu a Clínica Escola de Cirurgia de uma universidade pública para exodontia de terceiro molar inferior impactado (48). Ao exame clínico o dente apresentava-se semi-incluso e ao exame radiográfico (panorâmica e tomografia computadorizada), observou-se íntima relação da raiz do dente com o canal mandibular. Diante disto, foi realizada Odontectomia Parcial Intencional, com o intuito de preservação de feixe vásculo-nervoso adjacente. Paciente evoluiu satisfatoriamente sem sinais de infecção ou alteração sensorial de nervo alveolar inferior. Considerações finais: A Odontectomia Parcial Intencional é uma técnica segura, eficaz e de previsibilidade significativa, sendo uma alternativa que pode ser empregada em exodontias de molares mandibulares inclusos próximos ao canal mandibular, minimizando os riscos de lesões nervosas para os pacientes... (AU)


Introduction: Intentional partial odontectomy or coronectomy is a surgical approach that consists of removing the coronary portion of impacted mandibular molars and maintaining their roots in the dental alveolus. This technique is indicated when there is an intimate relationship between the tooth and the mandibular canal and its main objective is prevent injuries to the lower alveolar nerve. Case Report: Male patient, 24 years old, ASA I, compared the Clinical School of Surgery of a public university for extraction of the impacted lower third molar (48). On clinical or dental examination, we present semi impacted wisdom tooth and on radiographic examination (panoramic + computed tomography), an intimate relationship between the root of the tooth and the mandibular canal was observed. Therefore, intentional partial odontectomy was performed in order to preserve the adjacent vascular-nervous bundle. The patient progressed satisfactorily without signs of infection or sensory alteration of lower alveolar nerve. Final considerations: Intentional partial odontectomy is a safe, effective and predictable technique, being an alternative that can be used in extractions of mandibular molars, including those close to the mandibular canal, minimizing the risk of nerve injuries to patients... (AU)


Subject(s)
Humans , Male , Adult , Surgery, Oral , Tooth, Impacted , Mandibular Nerve , Molar , Molar, Third , Tooth , Tomography, X-Ray Computed , Tooth Socket
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