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1.
Rev. cir. traumatol. buco-maxilo-fac ; 22(3): 32-39, jul.-set. 2022. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1399763

ABSTRACT

Introdução. Decorrente do trauma local, durante a exodontia, ou pela falta de estímulos mastigatórios, a ausência dentária promove respostas biológicas que desencadeiam um processo de reabsorção óssea. A preservação óssea alveolar propõe minimizar a reabsorção óssea alveolar, promovendo maior biodisponibilidade óssea para a reabilitação por implantes dentários. Os implantes dentários são uma modalidade terapêutica eficaz para a reabilitação de ausências dentárias. Objetivo. relatar um caso de reabilitação por implante em alvéolo cicatrizado, após preservação alveolar. Relato de caso. Paciente A.L.L., sexo masculino, 23 anos, compareceu à clínica odontológica da UNIBRA. Ao exame físico observou-se ampla destruição coronária do elemento 25 e, ao exame radiográfico notou-se tratamento endodôntico. O tratamento proposto foi a exodontia minimamente traumática, preservação alveolar com matriz de colágeno e instalação de implante dentário em alvéolo cicatrizado. Discussão. Em desdentados, a falta de estímulos mastigatórios, promove um desequilíbrio no turnover ósseo, desencadeando um processo de reabsorção. A preservação alveolar por matriz de colágeno visa minimizar a reabsorção e fornecer maior biodisponibilidade óssea para a reabilitação por implantes. Conclusão. A preservação alveolar com a matriz de colágeno cumpriu com seu objetivo e, a reabilitação por implante dentário em alvéolo cicatrizado é uma modalidade eficaz na reabilitação de pacientes desdentados... (AU)


Introduction. Due to local trauma, during tooth extraction, or the lack of masticatory stimuli, the absence of teeth promotes biological responses that trigger a process of bone resorption. Alveolar bone promotion minimizes alveolar bone resorption, promoting high bone bioavailability for rehabilitation with dental implants. Dental implants are a treatment modality to edentulous. Objective. Report a case of implant rehabilitation in a healed socket after alveolar preservation. Case report. Patient A.L.L., male, 23 years old, attended the UNIBRA dental clinic. On physical examination, a wide coronary destruction of element 25 was observed and, on radiographic examination, endodontic treatment was noted. The proposed treatment was a minimally traumatic tooth extraction, alveolar preservation with collagen matrix and implant placement in healed sockets. Discussion. In edentulous patients, the lack of masticatory stimuli promotes an imbalance in bone turnover, triggering a resorption process. Alveolar preservation by collagen matrix aims to minimize resorption and provide greater bone bioavailability for implant rehabilitation. Conclusion. Alveolar preservation with collagen matrix fulfilled its objective, and rehabilitation by dental implant in a healed socket is an effective modality in the rehabilitation of edentulous patients... (AU)


Introducción. Por traumatismo local, durante la extracción dentaria, o por falta de estímulos masticatorios, la ausencia de dientes promueve respuestas biológicas que desencadenan un proceso de reabsorción ósea. La preservación ósea alveolar propone minimizar la reabsorción ósea alveolar, promoviendo una mayor biodisponibilidad ósea para la rehabilitación mediante implantes dentales. Los implantes dentales son una modalidad terapéutica eficaz para la rehabilitación de dientes perdidos. Objetivo. reportar un caso de rehabilitación con implantes en un alvéolo cicatrizado después de preservación alveolar. Reporte de un caso. Paciente A.L.L., masculino, 23 años, acudió a la clínica odontológica de la UNIBRA. El examen físico reveló destrucción coronaria extensa del elemento 25 y el examen radiográfico reveló tratamiento endodóntico. El tratamiento propuesto fue extracción dental mínimamente traumática, preservación alveolar con matriz de colágeno y colocación de implante dental en alvéolo cicatrizado. Discusión. En pacientes edéntulos, la falta de estímulos masticatorios promueve un desequilibrio en el recambio óseo, desencadenando un proceso de reabsorción. La preservación alveolar mediante matriz de colágeno tiene como objetivo minimizar la reabsorción y proporcionar una mayor biodisponibilidad ósea para la rehabilitación con implantes. Conclusión. La preservación alveolar con matriz de colágeno cumplió su objetivo, y la rehabilitación mediante implante dental en un alvéolo cicatrizado es una modalidad eficaz en la rehabilitación de pacientes edéntulos... (AU)


Subject(s)
Humans , Male , Young Adult , Surgery, Oral , Bone Resorption , Dental Implants , Alveolar Ridge Augmentation , Mouth Rehabilitation , Tooth Extraction , Tooth Injuries , Molar/surgery
2.
Rev. ADM ; 79(3): 146-151, mayo-jun. 2022. ilus, tab
Article in Spanish | LILACS | ID: biblio-1378372

ABSTRACT

Introducción: La finalidad del tratamiento de conductos es conseguir la máxima desinfección, conformación y sellado tridimensional. Objetivo: Comparar la capacidad del sellado apical entre dos técnicas de obturación en conductos mesiales de molares inferiores con limas fracturadas en tercio apical. Material y métodos: Se utilizaron 60 raíces mesiales de molares inferiores, instrumentados con Protaper Universal, se desgastó 4 milímetros la parte activa del instrumento y se fracturó intencionalmente en tercio apical. Se formaron dos grupos de 30 raíces mesiales (n = 30) cada uno y se utilizaron dos técnicas de obturación: grupo 1: condensación lateral clásica y grupo 2: Obtura II. Las muestras se sumergieron en tubos de ensayo y en su interior contenían 5 mL de tinta china, se diafanizaron y observaron con un microscopio estereoscópico (LEICA, EZ4D) a 35x para medir la penetración de tinta china dentro del conducto radicular. Resultados: Se encontró una mayor microfiltración apical con suficiente evidencia estadística en el grupo de Obtura II comparado con el grupo de condensación lateral clásica (p < 0.002). Conclusiones: Ambos grupos presentaron microfiltración apical; sin embargo, en el grupo que se utilizó el sistema de obturación termoplastificada Obtura II se detectó mayor filtración apical comparada con el grupo de condensación lateral clásica (AU)


Introduction: The purpose of root canal treatment is to achieve maximum disinfection, shaping and three-dimensional sealing. Objective: To compare the apical sealing capacity between two obturation techniques in mesial canals of mandibular molars with broken files in the apical third. Material and methods: 60 mesial roots of lower molars were used, instrumented with Protaper Universal, the active part of the instrument was worn by 4 millimeters and it was intentionally broken in the apical third. Two groups of 30 mesial roots (n = 30) each were formed and two filling techniques were used: group 1: classic lateral condensation and group 2: Obtura II. The samples were immersed in test tubes and contained 5 mL of Chinese ink inside, they were clear and observed with a stereomicroscope (LEICA, EZ4D) at 35x to measure the penetration of Chinese ink into the root canal. Results: A higher apical microfiltration with sufficient statistical evidence was found in the Obtura II group compared to the classic lateral condensation group (p < 0.002). Conclusions: Both groups presented apical microfiltration, however, in the group that used the Obtura II thermoplastic obturation system, greater apical filtration was detected compared to the classic lateral condensation group (AU)


Subject(s)
Root Canal Obturation/methods , Dental High-Speed Equipment/adverse effects , Dental Leakage , In Vitro Techniques , Cross-Sectional Studies , Dental Restoration Failure , Dental Pulp Cavity/anatomy & histology , Molar
3.
Rev. Odontol. Araçatuba (Impr.) ; 43(1): 45-50, jan.-abr. 2022. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1361713

ABSTRACT

O objetivo deste relato de caso foi descrever em detalhes a técnica de transfixação de pino de fibra de vidro no sentido horizontal e restauração de resina composta em um dente molar tratado endodonticamete. Paciente, sexo feminino, 51 anos de idade, buscou o Centro Universitário da Serra Gaúcha (FSG ­ Caxias do Sul ­ Rio Grande do Sul) com a necessidade de realizar tratamento endodôntico do elemento molar número 26. Após a avaliação inicial, foi realizada a endodontia. O elemento havia pouca sustentação das paredes vestibular e palatina, então foi proposto a colocação de pino intrarradicular seguido de coroa, entretanto, por questões financeiras a paciente não aceitou. Logo, foi proposto a técnica de transfixação horizontal de pino de fibra de vidro associado a uma restauração de resina composta de forma direta. O procedimento foi realizado em sessão única e foi utilizado um pino de fibra de vidro número 1 disposto transversalmente entre as paredes mesiopalatina e distovestibular. A restauração foi realizada com resina composta Filtek Z350, devolvendo estética e função ao elemento dentário. Pode-se concluir que a técnica de transfixação horizontal de pino de fibra de vidro associado à resina composta é uma alternativa restauradora que possibilita maior resistência aos dentes tratados endodonticamente, apresenta resultados funcionais e estéticos satisfatórios, além de possibilitar uma maior sobrevida aos mesmos(AU)


The purpose of this case report was to describe in detail the technique of horizontal transfixion of a fiberglass post into an endodontically treated tooth. Female patient, 51 years old, sought the University Center of Serra Gaúcha (FSG - Caxias do Sul ­ Rio Grande do Sul) with the need to perform the endodontic treatment of molar element number 26. After the initial evaluation, endodontics was performed. The element had little support for the buccal and palatal walls, so an intraradicular postplacement followed by a crown was proposed, for financial reasons the patient did not accept it. Therefore, the technique of horizontal transfixion of a fiberglass pin was proposed, associated with a restoration of direct composite resin. The procedure was performed in a single session and a number 1 fiberglass post was fixed crosswise between the mesiopalatal and distobuccal walls. The restoration was carried out with composite resin Filtek Z350, restoring aesthetics and function. It can be concluded that the horizontal transfixion of a fiberglass post associated with composite resin technique is a restorative alternative that allows greater resistance to endodontically treated teeth, provides satisfactory esthetics and better survival rates(AU)


Subject(s)
Humans , Female , Middle Aged , Composite Resins , Tooth, Nonvital , Dental Pins , Molar , Root Canal Filling Materials , Root Canal Therapy , Dental Restoration, Permanent , Flexural Strength
4.
Rev. Odontol. Araçatuba (Impr.) ; 43(1): 51-56, jan.-abr. 2022. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1361718

ABSTRACT

Este trabalho teve como objetivo apresentar um relato de caso clínico de uma restauração do tipo coroa endocrown cerâmica em um dente molar tratado endodonticamente. Paciente com 45 anos de idade, sexo feminino, procurou a clínica do Centro Universitário da Serra Gaúcha (FSG) relatando a necessidade de reabilitação protética no primeiro molar inferior do lado esquerdo. Com base no exame radiográfico e exame clínico foi constatado um primeiro molar inferior do lado esquerdo com tratamento endodôntico satisfatório, mas uma extensa destruição coronária. Após a aprovação da paciente e indicações para a utilização da técnica, optou-se pela confecção de uma coroa endocrown em cerâmica reforçada por dissilicato de lítio. Foi realizado o preparo do remanescente dentário, envolvendo a câmara pulpar, com ângulos arredondados e expulsivos e, após a moldagem do mesmo com silicone de adição, utilizando a técnica simultânea e duplo fio. O provisório foi realizado com resina quimicamente ativada na cor 62 e, na sessão seguinte a coroa endocrown foi ajustada e polida. Após receber o protocolo de condicionamento adequado da peça, a mesma foi cimentada com cimento autopolimerizável Multilink N. Pode-se concluir que a alternativa restauradora Endocrown é um tratamento conservador e favorável para dentes com extensa destruição coronária, permitindo adequada estética e função(AU)


This study aimed to present a clinical case report of an endocrown ceramic crown restoration in na endodontically treated molar tooth. A 45-year-old female patient sought the clinic at the Centro Universitário da Serra Gaúcha (FSG), reporting the need for prosthetic rehabilitation on the lower left first molar. Based on the radiographic and clinical examination, the first molar presented satisfactory endodontic treatment, but extensive coronary destruction. After the approval of the patient and indications for the use of the technique, it was decided to make an endocrown with reinforced ceramic by lithium disilicate. The remaining tooth was prepared, involving the pulp chamber, with rounded and expulsive angles and, after the impression with silicone using the simultaneous and double wire technique was taken. The provisional was made with chemically activated resin in color 62 and, in the following session, the endocrown crown was adjusted and polished. After receiving the proper conditioning protocol, it was lutted with Multilink N self-curing cement. It can be concluded that the Endocrown restorative alternative is a conservative and favorable treatment for teeth with extensive coronary destruction, allowing adequate aesthetics and function(AU)


Subject(s)
Humans , Female , Middle Aged , Ceramics , Tooth, Nonvital , Crowns , Molar , Dental Prosthesis , Dental Pulp Cavity , Prosthesis Retention
5.
Rev. Odontol. Araçatuba (Impr.) ; 43(1): 57-61, jan.-abr. 2022. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1361720

ABSTRACT

A agenesia dentaria é uma anomalia de desenvolvimento caracterizada pela determinação congênita de menor numero de dentes, podendo estar associada a síndromes genéticas ou ocorrer isoladamente. Embora seja considerada uma das anomalias mais frequentes quando envolve terceiros molares, segundo pré-molares e incisivos laterais, sua ocorrência em dentes estáveis, tais como o canino e o primeiro molar permanente é rara. Desta forma, este relato apresentará o caso de uma paciente do sexo feminino, 8 anos idade, que iniciou tratamento de rotina na Clínica de Odontopediatria da UNIFENAS. Na anamnese não foi relatada pela responsável a ocorrência de alterações sistêmicas, nem queixa ou histórico odontológico relevante. No exame clínico odontológico, notou-se o não irrompimento do primeiro molar permanente superior direito (16). Diante dos exames de imagem, foi confirmada a agenesia do dente 16 e também do canino permanente superior direito (13). A agenesia, sobretudo de dentes estáveis e relevantes no arco dentário, pode comprometer o desenvolvimento adequado da oclusão, mastigação, fonação e estética. Desta maneira, é importante o diagnóstico precoce desta ocorrência com o objetivo de favorecer a elaboração de um adequado plano de tratamento e, minimizar as sequelas destas agenesias atípicas(AU)


Dental agenesis is a developmental anomaly characterized by the congenital determination of fewer teeth, may be associated with genetic syndromes or occur in an isolated form. Although it is considered one of the most frequent anomalies when it involves third molars, second lateral premolars and incisors, the occurrence in stable teeth, such as the permanent canine and the permanent first molar is rare. This report will present the case of an 8-year-old female patient who started routine treatment at the Pediatric Dentistry Clinic of UNIFENAS. In the anamnesis, the responsible person did not report the occurrence of systemic alterations, or a relevant dental complaint or history. On dental clinical examination, it was noticed the non-rupture of the permament maxillar right first molar (16). In view of the imaging tests, the agenesis of tooth 16 and also of the permanent maxillary right canine (13) was confirmed. Agenesis, especially of stable and relevant teeth in the dental arch, may compromise the proper development of occlusion, chewing, phonation and aesthetics. Thus, it is of paramount importance to early diagnosis of this occurrence in order to favor the development of an appropriate treatment plan in order to minimize the sequelae of these atypical agenesis(AU)


Subject(s)
Humans , Male , Child , Phonation , Cuspid , Anodontia , Molar , Dental Occlusion , Esthetics, Dental , Mastication , Anodontia/diagnosis , Anodontia/therapy
6.
Rev. cir. traumatol. buco-maxilo-fac ; 22(1): 43-48, jan.-mar. 2022. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1392018

ABSTRACT

O transplante dentário autógeno é um procedimento cirúrgico que consiste na transposição de um elemento dentário do seu alvéolo para um outro, em um mesmo indivíduo. Esta abordagem é indicada para substituir elementos com prognóstico desfavorável ou reabilitar áreas edêntulas. O objetivo deste trabalho é apresentar as vantagens do transplante dentário autógeno frente a perdas dentárias precoces e os critérios necessários para indicação do mesmo, por meio de um relato de caso clínico no qual, uma paciente do gênero feminino, 16 anos foi submetida ao transplante do elemento 48 para o alvéolo do 47 por motivos de lesão cariosa com extensa destruição coronária com impossibilidade de tratamento clínico restaurador. Em acompanhamento pós-operatório de 01 ano os resultados demostraram continuidade do desenvolvimento radicular do elemento transplantado em seu novo alvéolo, estando este, sem mobilidade, livre de lesões periodontais e/ou endodônticas. Desta forma, conclui-se que as vantagens do transplante dentário autógeno incluem a possibilidade de reabilitação dentária de forma natural, imediata e de baixo custo comparado a tratamentos como implantes e próteses. E este método quando indicado corretamente e realizado sob os devidos cuidados pode alcançar excelentes resultados funcionais e estéticos, sendo uma opção viável para reabilitação de perdas dentárias precoces... (AU)


The Autogenous dental transplantation is a surgical procedure that consists of the transposition of a dental element from its socket to another, in the same individual. This approach is indicated to replace elements with an unfavorable prognosis or to rehabilitate edentulous areas. The objective of this paper is to present the advantages of autogenous dental transplantation against early tooth loss and the necessary criteria for its indication, through a clinical case report in which a 16-year-old female patient underwent transplantation element 48 for the alveolus of the 47 due to carious lesions with extensive coronary destruction with impossibility of restorative clinical treatment. In a 01-year postoperative follow-up, the results showed continuity of root development of the transplanted element in its new alveolus, which is without mobility, free from periodontal and/or endodontic lesions. Thus, it is concluded that the advantages of autogenous dental transplantation include the possibility of natural, immediate and low-cost dental rehabilitation compared to treatments such as implants and prostheses. And this method, when correctly indicated and performed with due care, can achieve excellent functional and esthetic results, being a viable option for the rehabilitation of early tooth loss... (AU)


El trasplante dentario autógeno es un procedimiento quirúrgico que consiste en la transposición de un elemento dentario de su alvéolo a otro, en el mismo individuo. Este abordaje está indicado para reemplazar elementos con pronóstico desfavorable o para rehabilitar áreas edéntulas. El objetivo de este trabajo es presentar las ventajas del trasplante dentario autógeno frente a la pérdida dentaria precoz y los criterios necesarios para su indicación, mediante el reporte de un caso clínico en el que se trasplantó a una paciente de sexo femenino de 16 años. 47 por lesiones cariosas con extensa destrucción coronaria con imposibilidad de tratamiento clínico restaurador. En un seguimiento postoperatorio de 01 año, los resultados mostraron continuidad del desarrollo radicular del elemento trasplantado en su nuevo alvéolo, que se encuentra sin movilidad, libre de lesiones periodontales y/o endodónticas. Así, se concluye que las ventajas del trasplante dental autógeno incluyen la posibilidad de una rehabilitación dental natural, inmediata y de bajo costo frente a tratamientos como implantes y prótesis. Y este método, correctamente indicado y realizado con el debido cuidado, puede lograr excelentes resultados funcionales y estéticos, siendo una opción viable para la rehabilitación de la pérdida dentaria temprana... (AU)


Subject(s)
Humans , Female , Adolescent , Surgical Procedures, Operative , Surgery, Oral , Transplantation, Autologous , Tooth Loss , Molar/surgery , Molar/transplantation
7.
Rev. ADM ; 79(1): 12-19, ene.-feb. 2022. ilus, graf
Article in Spanish | LILACS | ID: biblio-1361307

ABSTRACT

El objetivo del presente estudio fue medir la curvatura vestíbulo-lingual de los conductos de las raíces mesiales de primeros molares inferiores en personas adultas del estado de Chihuahua, por medio de la técnica de tomografía computarizada de haz cónico (CBCT, por sus siglas en inglés) y usando el software de análisis 3D EndoTM (Dentsply/Sirona USA). Se llevó a cabo la medición por dos observadoras, empleando dos métodos diferentes, Schneider y 3D EndoTM (Dentsply/Sirona USA). Los resultados obtenidos tuvieron valores mayores a los 100 grados con la técnica 3D EndoTM y a los 20 grados con la técnica de Schneider. No se detectó una diferencia estadística significativa al comparar los diferentes conductos entre sí (AU)


The objective of the present study was to measure the vestibule-lingual curvature of the ducts of the mesial roots of lower first molars, of adults from the state of Chihuahua. Using the cone beam computed tomography (CBCT) technique and using the 3D analysis software EndoTM (Dentsply/Sirona USA). The measurement was carried out by two observers using two different methods, Schneider and 3D EndoTM (Dentsply/Sirona USA). The results obtained had values greater than 100 degrees with the 3D EndoTM technique and at 20 degrees with the Schneider technique. No statistically significant difference was detected when comparing the different ducts with each other (AU)


Subject(s)
Humans , Dental Pulp Cavity , Cone-Beam Computed Tomography , Molar , Software , Data Interpretation, Statistical , Imaging, Three-Dimensional , Mexico
8.
Braz. dent. sci ; 25(2): 1-10, 2022. tab, ilus
Article in English | LILACS, BBO | ID: biblio-1363729

ABSTRACT

Objective: This study aimed to evaluate the prevalence of root fusion and the incidence of C-shaped canals in maxillary first molar (MFM) and maxillary second molar (MSM) teeth using cone-beam computed tomography. Material and Methods: In this study, a total of 1233 MFMs and 1406 MSMs from 802 patients were analyzed. First, the number of fused rooted teeth and the type of root fusion were determined. Subsequently, incidence and number of C-shaped canals were ascertained according to the type of fusion, location, position, and level of canal merging in teeth with fused roots. Six types were established according to the C-shape configurations observed. Presence of root fusion and the C-shaped canal according to gender, age, and tooth position were evaluated by chi-square test. Values with p< 0.05 were considered significant in statistical tests. Results: The incidence of fusion in the MFM and MSM teeth was 6.16% and 22.40%, respectively. Only three MFMs (0.24%) and 3.77% of the MSMs had C-shaped canals. While the incidence of fusion was higher in women (p< 0.05), the C shaped morphology was not affected by sex (p> 0.05). Individuals over the age of 50 years had a lower incidence of C-shaped canals (p< 0.05). Conclusion: C-shaped canal morphology was more commonly associated with complex types of root fusion involving three roots; 16.83% of MSMs with fused roots had C-shaped canals (AU).


Objetivo: o objetivo deste estudo foi avaliar a prevalência de fusão radicular e a incidência de canais em C nos dentes do primeiro molar superior (MFM) e do segundo molar superior (MSM) por meio da tomografia computadorizada de feixe cônico. Material e Métodos: Neste estudo, um total de 1233 MFMs e 1406 MSMs de 802 pacientes foram analisados. Primeiro, o número de dentes com raízes fundidas e o tipo de fusão radicular foram determinados. Posteriormente, a incidência e o número de canais em forma de C foram verificados de acordo com o tipo de fusão, localização, posição e nível de fusão do canal nos dentes com raízes fundidas. Seis tipos foram estabelecidos de acordo com as configurações em forma de C observadas. A presença de fusão radicular e do canal em C de acordo com sexo, idade e posição dentária foram avaliadas pelo teste do qui-quadrado. Valores com p <0,05 foram considerados significativos nos testes estatísticos. Resultados: A incidência de fusão nos dentes MFM e MSM foi de 6,16% e 22,40%, respectivamente. Apenas três MFMs (0,24%) e 3,77% dos MSMs tinham canais em forma de C. Enquanto a incidência de fusão foi maior em mulheres (p <0,05), a morfologia em forma de C não foi afetada pelo sexo (p> 0,05). Indivíduos com mais de 50 anos apresentaram menor incidência de canais em C (p <0,05). Conclusão: a morfologia do canal em forma de C foi mais comumente associada a tipos complexos de fusão radicular envolvendo três raízes; 16,83% dos HSH com raízes fundidas tinham canais em forma de C (AU).


Subject(s)
Humans , Tooth Root , Dental Pulp Cavity , Cone-Beam Computed Tomography , Molar
9.
Article in Chinese | WPRIM | ID: wpr-936118

ABSTRACT

OBJECTIVE@#To compare the effects of resin base and different retention depth on the fracture resistance of mandibular molars restored with nano-ceramic endocrowns.@*METHODS@#Forty mandibular molars selected and randomly divided into 5 groups: ① The control group which was consisted of intact teeth, ② the non-resin base group, ③ the 2 mm retention depth group, ④ the 3 mm retention depth group, ⑤ the 4 mm retention depth group, respectively. After tooth preparation, in vitro root canal therapy was conducted, which was followed by endocrown design, production and adhesive of groups ②-⑤. All the samples were under load (N) of the universal mechanical testing machine after embedding. The fracture pattern of each sample was observed under stereomicroscope. Then the microstructure of the fracture surface was observed by scanning electron microscopy.@*RESULTS@#The fracture loads of each group were respectively: the control group fracture load was (3 069.34±939.50) N; experimental groups: fracture load of (2 438.04±774.40) N for the group without resin base; fracture load of (3 537.18±763.65) N for the group with 2 mm retention depth. The fracture load of the retention depth 3 mm group was (2 331.55±766.39) N; the fracture load of the retention depth 4 mm group was (2 786.98±709.24) N. There was statistical significance in the effect of resin base and different retention depth on the fracture loads of molars restored with nano-ceramic endocrown (P < 0.05). Repairable fractures in each group were as follows: control group 2/8, non-resin base group 1/8, retention depth of 2 mm group 1/8, retention depth of 3 mm group 2/8, and retention depth of 4 mm group 0/8. The effects of the retention depth and the presence of resin base on the fracture resistance of the resin nano-ceramic endocrowns were statistically significant (P < 0.05). Scanning electron microscopy showed more arrest lines and small twist hackles on the fracture surface of the restorations with resin base (retention depths of 2 mm, 3 mm, and 4 mm), with cracks extending towards the root. In addition to the characteristics above, more transverse cracks parallel to the occlusal surface, pointing outwards from the center of the pulp cavity retention, were also observed on the fracture surface of the non-resin base restorations.@*CONCLUSION@#When molar teeth with nano-ceramic endocrowns are restored, resin base and the retention depth of 2 mm help the teeth to obtain optimal fracture strength.


Subject(s)
Ceramics , Composite Resins , Dental Porcelain , Dental Restoration Failure , Dental Stress Analysis , Materials Testing , Molar
10.
Chinese Journal of Stomatology ; (12): 384-389, 2022.
Article in Chinese | WPRIM | ID: wpr-935877

ABSTRACT

Objectives: To evaluate the diagnostic consistency of working lengths by observing endodontic files in root canals and periapical subtle structures in digital intraoral radiographs presented in two smartphones, a tablet and a laptop computer. Methods: A dried human skull embedded in an acrylic compound was used for exposing radiographs of the upper and lower second premolars and first molars with two endodontic files (Kerr files size 10 and 15) positioned to the full length of the roots or 1.5 mm short of apexes. A total of 100 radiographs were taken for each of the file sizes. Five observers were asked to assess all the 200 digital radiographs according to a 5-category scale in smartphone A (HUAWEI P9 Plus), smartphjone B (Apple iPhone 7), tablet (Apple iPad 2018) and laptop computer (Lenovo Thinkpad E480), respectively. The gold standard for receiver operating characteristic curve (ROC) analysis was determined with the endodontic Kerr file size 20. A total of 150 roots with files were radiographed, 75 of which with files reaching the radiographic apexes of the respective roots and 75 of which with files 1.5 mm short of the radiographic apexes for each endodontic file size. Results from ROC analysis was analyzed with one-way ANOVA and independent sample t test. Results: For the Kerr file size 10, the area under the ROC curve for laptop, tablet and two smartphones were 0.891±0.037, 0.869±0.037, 0.870±0.017 and 0.849±0.037, while for the Kerr file size 15 the ROC values were 0.957±0.02, 0.961±0.02, 0.961±0.01 and 0.961±0.02, respectively. There were no significant differences for diagnostic accuracy for observing endodontic file positions among digital radiographs presented in the two smartphones, one tablet and one laptop devices (endodontic file size 10: F=1.39, P=0.281; endodontic file size 15: F=0.05, P=0.985). A significant difference was found in the diagnostic accuracy of endodontic file positions between size 10 and 15 files in different display devices (t=-10.65, P<0.001). Conclusions: There was a high diagnostic consistency in the determination of working length and periapical subtle structures of roots by observing digital radiographs displayed on smartphones, tablet and laptop computer.


Subject(s)
Dental Instruments , Dental Pulp Cavity/diagnostic imaging , Electronics , Humans , Molar , Observer Variation , Root Canal Preparation
11.
Chinese Journal of Stomatology ; (12): 251-257, 2022.
Article in Chinese | WPRIM | ID: wpr-935858

ABSTRACT

Objective: To study the clinical outcomes and feasibility of immediate implantation after flap surgery and minimally invasive extraction in the maxillary molar area and to provide a reference for it. Methods: Forty-one patients (41 molars in total) with maxillary molars that could not be preserved, treated from June 2018 to June 2020 at the Department of Oral and Maxillofacial Surgery at the Affiliated Hospital of Qingdao University, were selected. There are 24 males and 17 females with the age of (49.7±1.8) years (range 18-66 years). Pre-operative cone-beam CT (CBCT) was taken for measurement and analysis. After flap surgery and minimally invasive tooth extraction, the inflammatory granulation tissues attached to the soft and hard tissues were completely scraped and clipped, followed by the preparation of the implants in the correct three-dimensional position. Torque value and implant stability quotient (ISQ) were recorded after implant placement and with non-submerged healing. CBCT examination was taken 6 months after surgery and ISQ value was checked before crown restoration. CBCT examination was also taken 1 year after the permanent restoration. The survival rate of 6 months after surgery, the success rate of 1 year after permanent restoration, and the size of jump gaps immediately after surgery, 6 months after surgery, 1 year after permanent restoration respectively, were performed. The ISQ values were compared immediately and 6 months after surgery. Results: A total of 41 implants were placed in 41 patients. Six months after surgery, the survival rate was 100% (41/41). Twelve months after permanent restoration, the success rate of the implant restoration was 100% (41/41). The torque value after implant implantation was (42.77±0.79) N·cm. The buccal and palatal jump gaps were (3.15±0.16) mm and (2.86±0.18) mm immediately after surgery, respectively. The mesial and distal jump gaps were (2.94±0.19) mm and (3.77±0.21) mm, respectively. CBCT showed that no jump gap around the implants at 6 months after surgery and 1 year after permanent restoration. The ISQ values at immediately and 6 months after surgery were (74.78±0.59) and (80.20±0.49) respectively, and the difference was statistically significant (t=-9.03, P<0.001). Conclusions: Immediate dental implantation in the correct three-dimensional position could achieve good osseointegration by means of flap surgery, minimally invasive extraction and thorough removal of inflammatory tissue on the surface of soft and hard tissues. The clinical outcomes were satisfactory.


Subject(s)
Adolescent , Adult , Aged , Dental Implantation, Endosseous/methods , Dental Implants , Feasibility Studies , Female , Humans , Immediate Dental Implant Loading , Male , Middle Aged , Molar/surgery , Young Adult
12.
Chinese Journal of Stomatology ; (12): 242-250, 2022.
Article in Chinese | WPRIM | ID: wpr-935857

ABSTRACT

Objectives: To study the design of nonmetallic crowns for deciduous molars by means of computer aided design and to analyze the key parameters of the nonmetallic crowns of deciduous molars using finite element method. Methods: The three-dimensional model of a mandibular second primary molar was constructed by using a micro-CT system. The thickness of the crown was limited to 0.5 mm and four different crown shapes (chamfer+anatomic, chamfer+non-anatomic, knife edge+anatomic and knife edge+non-anatomic) were designed. Then, the crown shape was limited as chamfer+non-anatomic and five different thicknesses of the crown (0.50, 0.75, 1.00, 1.25, 1.50 mm) were designed, and three different materials, including polyetherketoneketone (PEKK), polymethylmethacrylate (PMMA) resin and resin-infiltrated ceramic, were applied to make the crown. Stress distribution and fatigue of each component of the model under vertical and oblique loadings were analyzed by using finite element method. Non-axial retention analysis was performed on chamfer+non-anatomic crowns, made of PMMA resin, with thicknesses of 0.50, 0.75, 1.00, 1.25 and 1.50 mm. Results: Among the four crown shape designs, the chamfer+non-anatomic type crown showed the lowest von Mises stress and the highest safety factor. By comparing three different materials, the resin-infiltrated ceramic group showed obvious stress concentration on the buccal edge of the crown and the PEKK group showed stress concentration in the adhesive layer. Results of non-axial retention analysis showed that the torques required by the crowns with five thicknesses at the same rotation angle were as follows: 4 856.1, 4 038.1, 3 497.3, 3 256.3 and 3 074.3 N⋅m, respectively. The comparison of areas of the adhesives fracture among groups were as follows: 0.5 mm group < 0.75 mm group < 1.00 mm group < 1.25 mm group < 1.50 mm group. Conclusions: In the design of nonmetallic crowns for primary molars, the edge of the crown should be designed as chamfer, the shape of the inner crown should be non-anatomical and the minimum preparation amount of the occlusal surface should be 1.00 mm. Among the three materials, PMMA resin, of which elastic modulus is similar to the dentin and the dental adhesive, might be the most suitable material for the crowns of primary molars.


Subject(s)
Ceramics , Crowns , Dental Stress Analysis/methods , Finite Element Analysis , Molar
13.
Chinese Journal of Stomatology ; (12): 192-195, 2022.
Article in Chinese | WPRIM | ID: wpr-935849

ABSTRACT

Infraocclusion is a phenomenon that the relative occlusal growth of a tooth stops after the period of active eruption and then the tooth becomes depressed below the occlusal plane. Infraocclusion occurred more commonly in children and the mostly affected teeth were the primary mandibular second molars. The occlusal problem caused by infraocclusion may progressively worsen with age. This review summarizes the etiology, diagnosis and treatment of infraoccluded second primary molars, so as to provide reference for the dental clinicians.


Subject(s)
Child , Humans , Malocclusion/therapy , Molar , Tooth Abnormalities , Tooth Eruption , Tooth, Deciduous
14.
Article in English | WPRIM | ID: wpr-929133

ABSTRACT

Neural crest-derived mesenchymal stem cells (MSCs) are known to play an essential function during tooth and skeletal development. PRX1+ cells constitute an important MSC subtype that is implicated in osteogenesis. However, their potential function in tooth development and regeneration remains elusive. In the present study, we first assessed the cell fate of PRX1+ cells during molar development and periodontal ligament (PDL) formation in mice. Furthermore, single-cell RNA sequencing analysis was performed to study the distribution of PRX1+ cells in PDL cells. The behavior of PRX1+ cells during PDL reconstruction was investigated using an allogeneic transplanted tooth model. Although PRX1+ cells are spatial specific and can differentiate into almost all types of mesenchymal cells in first molars, their distribution in third molars is highly limited. The PDL formation is associated with a high number of PRX1+ cells; during transplanted teeth PDL reconstruction, PRX1+ cells from the recipient alveolar bone participate in angiogenesis as pericytes. Overall, PRX1+ cells are a key subtype of dental MSCs involved in the formation of mouse molar and PDL and participate in angiogenesis as pericytes during PDL reconstruction after tooth transplantation.


Subject(s)
Animals , Cell Differentiation , Mesenchymal Stem Cells , Mice , Molar , Osteogenesis/physiology , Periodontal Ligament
15.
Chinese Journal of Stomatology ; (12): 213-219, 2022.
Article in Chinese | WPRIM | ID: wpr-928252

ABSTRACT

Ectopic eruption of the maxillary permanent first molar refers to its deviation from the normal position due to some factors during the eruption process, which will lead to root resorption and early loss of the adjacent second primary molar, mesial movement itself, or serious malocclusion. To solve these problems, the Society of Pediatric Dentistry of Chinese Stomatological Association organized pediatric dental experts from 16 universities and hospitals, including West China Hospital of Stomatology, Sichuan University, Peking University School and Hospital of Stomatology, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine to carry out a panel discussions. The research, and diagnosis and treatment experiences of ectopic eruption of maxillary permanent first molar at home and abroad in recent years were also referred to. The present guideline was eventually developed for the reference of dental clinicians.


Subject(s)
Child , China , Consensus , Humans , Maxilla , Molar , Tooth Eruption, Ectopic/therapy
16.
Int. j. morphol ; 40(4): 920-926, 2022. ilus, tab
Article in English | LILACS-Express | LILACS | ID: biblio-1405233

ABSTRACT

SUMMARY: To evaluate the skeletal, dento-alveolar and soft tissue morphology changes after maxillary molar distalization by clear aligner therapy and identify the significant efficacy of molar distalization,18 patients in conformity with the inclusion criteria were selected. Pre- and post-treatment Cone Beam Computed Tomography (CBCT) were examined to measure the angular and linear parameters. All subjects were completed non-extraction clear aligner treatment by distalizing molars. A paired-t test and independent-samples t-test were performed to observe the difference between before and after treatment and the difference between the first molar and second molar respectively. P-values <0.05 were considered statistically significant. Predicted movement rate was calculated by the formula: (actual movement(mm)/planned movement(mm)) x100%. Most variables of pre- and post-treatment showed no statistical difference(P<0.05), excepting SNA angle (P<0.05) and Upper lip/E-line linear (P<0.01) due to incisor retraction. The first and second molar revealed a translation movement without significant tipping and vertical movement. Clear aligners provided a high predictability (83.44 %) of distalization the maxillary first molar, and 85.14 % of the maxillary second molar. Clear aligners can effectively achieve distal displacement of molars.


RESUMEN: Se seleccionaron 18 pacientes, de acuerdo con los criterios de inclusión, para evaluar los cambios en la morfología esquelética, dentoalveolar y de los tejidos blandos después de la distalización de los molares maxilares, mediante la terapia con alineadores transparentes e así identificar la significativa eficacia de la distalización de los molares. Se examinó a través de tomografía computarizada de haz cónico (CBCT) antes y después del tratamiento para medir los parámetros angulares y lineales. Todos los sujetos completaron el tratamiento con alineadores transparentes sin extracción mediante la distalización de los molares. Se realizó una prueba t pareada y una prueba t de muestras independientes para observar la diferencia entre antes y después del tratamiento y la diferencia entre el primer molar y el segundo molar, respectivamente. Los valores de p<0,05 se consideraron estadísticamente significativos. La tasa de movimiento prevista se calculó mediante la fórmula: (movimiento real (mm)/movimiento planificado (mm)) x 100 %. La mayoría de las variables de pre y postratamiento no mostraron diferencia estadística (P<0,05), excepto el ángulo SNA (P<0,05) y el labio superior/línea E lineal (P<0,01) debido a la retracción del incisivo. El primer y segundo molar revelaron un movimiento de traslación sin inclinación significativa y movimiento vertical. Los alineadores transparentes proporcionaron una alta previsibilidad (83,44 %) de la distalización del primer molar superior y del 85,14 % del segundo molar superior. Los alineadores transparentes pueden lograr efectivamente el desplazamiento distal de los molares.


Subject(s)
Humans , Tooth Movement Techniques/methods , Cephalometry , Malocclusion/therapy , Molar , Orthodontic Appliances, Removable , Retrospective Studies , Cone-Beam Computed Tomography
17.
Int. j. morphol ; 40(5): 1321-1327, 2022. ilus, tab
Article in English | LILACS-Express | LILACS | ID: biblio-1405275

ABSTRACT

SUMMARY: temporary mandibular molars in panoramic radiographs of pediatric patients with unilateral posterior crossbite (UPCB). This cross-sectional and retrospective study analyzed 114 orthopantomograms of patients between 6 - 9 years of age with unilateral posterior crossbite diagnosis. The first and second mandibular molars were analyzed. Their root resorption stage was typified, and the root lengths were measured; to later compare the data obtained depending on the malocclusion side. 86.4 % of molars showed a linear resorption pattern, and atypical resorption prevalence in patients with UPCB was 13.5 %. The total length average of the first molars on the side of the malocclusion was 8.20 mm, while the contralateral exhibited a mean of 9.29 mm. Lastly, the second molars had a mean length of 11.12 mm in crossbite side and 12.30 mm in the normal occlusion side. UPCB could affect physiological resorption by observing a resorption alteration in those mandibular molars located on the malocclusion side.


RESUMEN: El trabajo de este estudio se realizó en molares mandibulares temporales en radiografías panorámicas de pacientes pediátricos con mordida cruzada posterior unilateral (MCPU). Este estudio transversal y retrospectivo analizó 114 ortopantomografías de pacientes entre 6 - 9 años de edad con diagnóstico de mordida cruzada posterior unilateral. Se analizaron los primeros y segundos molares mandibulares. Se tipificó su estado de reabsorción radicular y se midió la longitud de las raíces; para luego comparar los datos obtenidos según el lado de la maloclusión. El 86,4 % de los molares mostró un patrón de reabsorción lineal y la prevalencia de reabsorción atípica en pacientes con MCPU fue del 13,5 %. El promedio de longitud total de los primeros molares del lado de la maloclusión fue de 8,20 mm, mientras que el contralateral exhibió una media de 9,29 mm. Por último, los segundos molares tenían una longitud media de 11,12 mm en el lado de mordida cruzada y de 12,30 mm en el lado de oclusión normal. La MCPU podría afectar la reabsorción fisiológica al observar una alteración de la reabsorción en aquellos molares mandibulares ubicados en el lado de la maloclusión.


Subject(s)
Humans , Male , Female , Child , Root Resorption/diagnostic imaging , Tooth, Deciduous/diagnostic imaging , Malocclusion/diagnostic imaging , Radiography, Panoramic , Cross-Sectional Studies , Retrospective Studies , Age and Sex Distribution , Molar/anatomy & histology , Molar/diagnostic imaging
18.
Rev. cir. traumatol. buco-maxilo-fac ; 21(4): 6-13, out.-dez. 2021. ilus
Article in Portuguese | LILACS, BBO | ID: biblio-1391244

ABSTRACT

Complicações pós-operatórias como edema, dor e trismo são comuns em cirurgias orais. Terapias, como o uso de analgésicos e anti-inflamatórios, são indicadas para estas complicações. No entanto, intervenções pré-operatórias podem ser alternativas. Desta forma, o presente estudo avaliou o efeito da dexametasona no edema, intensidade de dor e abertura de boca (trismo) no pós-operatório de retirada de terceiros molares inferiores. Pacientes (n=14, 9 mulheres) foram incluídos em um estudo clínico, cruzado, cego, randomizado, placebo-controlado e boca dividida. Pacientes receberam aleatoriamente medicação preemptiva (dexametasona 8mg, intramuscular, músculo masseter) ou placebo (soro fisiológico) uma hora antes da primeira cirurgia. O procedimento contralateral foi realizado 21 dias após. Avaliou se o edema e a abertura bucal nos momentos pré-operatórios e no 3º e 7º dias pós-operatórios, além de dor espontânea (imediatamente, 2 e 24 horas, 3 dias e 7 dias). Os dados foram analisados usando anova de medidas repetidas seguida do teste post hoc LSD de Fisher. Comparado ao placebo, a medicação reduziu edema (3 dias), dor (2 e 24 horas) e trismo (3 dias). Os resultados sugerem que o uso preemptivo da dexametasona intramuscular é capaz de aumentar o bem-estar dos pacientes submetidos a cirurgias orais, tendo o potencial de reduzir os custos pós-operatórios... (AU)


Postoperative complications such as edema, pain, and trismus are common in oral surgery. Therapies, such as the use of painkillers and anti inflammatory drugs, are indicated for the reversal of these complications. However, preoperative (preemptive) interventions can be alternatives. Thus, the present study aimed to evaluate the effect of dexamethasone on edema, pain intensity, and mouth opening (trismus) in the postoperative period of removal of impacted lower third molars. Patients (n = 14, 9 women) were included in a clinical, crossover, blinded, randomized, placebo-controlled, and divided mouth study. Preemptive mediation (dexamethasone 8mg, intramuscular, masseter muscle) or placebo (saline) was randomly given before the first surgery. The contralateral procedure was performed 21 days later. In the postoperative period, edema, mouth opening (preoperative, 3 and 7 days), and spontaneous pain (immediately, 2 and 24 hours, 3 days and 7 days) were analyzed. The data were analyzed using the one-way repeated measures ANOVA followed by Fisher's LSD post hoc. Compared to placebo, the medication reduced edema (3 days), pain (2 and 24 hours), and trismus (3 days). The results suggest that the preemptive use of dexamethasone is able to increase the well-being of patients undergoing oral surgeries, with the potential to reduce postoperative costs... (AU)


Las complicaciones posoperatorias como hinchazón, dolor y trismo son comunes en las cirugías orales. Las terapias, como el uso de analgésicos y antiinflamatorios, están indicadas para estas complicaciones. Sin embargo, las intervenciones preoperatorias pueden ser alternativas. Así, el presente estudio evaluó el efecto de la dexametasona sobre el edema, la intensidad del dolor y la apertura de la boca (trismo) en el postoperatorio de remoción del tercer molar inferior. Los pacientes (n = 14, 9 mujeres) se incluyeron en un estudio clínico, cruzado, ciego, aleatorizado, controlado con placebo y de boca dividida. Los pacientes recibieron aleatoriamente medicación preventiva (8 mg de dexametasona, intramuscular, músculo masetero) o placebo (solución salina) una hora antes de la primera cirugía. El procedimiento contralateral se realizó 21 días después. Se evaluó el edema y la apertura de la boca en el preoperatorio y en el tercer y séptimo días postoperatorios, además del dolor espontáneo (inmediato, 2 y 24 horas, 3 días y 7 días). Los datos se analizaron utilizando anova de medidas repetidas seguido de la prueba post hoc de LSD de Fisher. En comparación con el placebo, el medicamento redujo el edema (3 días), el dolor (2 y 24 horas) y el trismo (3 días). Los resultados sugieren que el uso preventivo de dexametasona intramuscular puede aumentar el bienestar de los pacientes sometidos a cirugía oral, con el potencial de reducir los costos posoperatorios... (AU)


Subject(s)
Humans , Male , Female , Adolescent , Adult , Pain , Pain, Postoperative , Postoperative Complications , Postoperative Period , Surgery, Oral , Trismus , Dexamethasone , Molar, Third , Pain Measurement , Edema , Analgesics , Anti-Inflammatory Agents , Molar , Molar, Third/surgery
20.
Braz. j. oral sci ; 20: e210432, jan.-dez. 2021. ilus
Article in English | LILACS, BBO | ID: biblio-1254269

ABSTRACT

Aim: The aim of this study was to evaluate, by micro-computed tomography (micro-CT) analysis, the remaining filling material during endodontic retreatment performed with Protaper retreatment without solvent. Methods: Forty mandibular molars were divided into two groups (n = 20) according to the sealer used in the obturation: the bioceramic TotalFill BC (TF) or the resin-based AH Plus (AHP). The specimens were scanned before instrumentation, after obturation and after filling removal. Only the mesial roots were analysed. The filling volumes and the remaining filling material were calculated in the entire root canal and in the cervical, middle and apical thirds. Results: The volume of obturation and the volume of remaining filling material in the entire root canal and in the cervical, middle and apical thirds of the canal between the groups were not statistically different (independent t-test, p > 0.05). In the AHP group, there was a higher percentage of remaining filling material in the middle third than in the cervical third (p < 0.05). Conclusion: The filling material could not be entirely removed from any specimen


Subject(s)
Root Canal Filling Materials , Retreatment , X-Ray Microtomography , Molar
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