Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 17.336
Filtrar
1.
J Oral Sci ; 62(2): 236-238, 2020 Mar 28.
Artigo em Inglês | MEDLINE | ID: mdl-32161232

RESUMO

Qualified diagrams of removable partial denture (RPD) designs created by dentists provide technicians with clear and dynamic information. Generating RPD design in the clinical decision support system (CDSS) can be achieved by producing the RPD design in a textual format and then transferring the design onto diagrams. The drawing of RPD diagrams automatically and efficiently for the given textual designs is still under investigation. A new workflow consisting of three major steps is developed to produce and visualize two-dimensional RPD design diagrams. Annotations and orientations of teeth are established from the base maps in the first step, and built-in rules are then incorporated to describe the variations caused by the interactions of the RPD components. Finally, the software draws each component using a series of curve functions. To validate the performance of the software, 112 RPD clinical design plans are randomly selected as inputs for the software, and the outputs are independently verified by experienced clinicians. The proposed methods are proven to be efficient and accurate and thus can be used to improve clinical quality.


Assuntos
Sistemas de Apoio a Decisões Clínicas , Prótese Parcial Removível , Dente , Planejamento de Dentadura , Software
2.
Braz Dent J ; 31(1): 37-43, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32159704

RESUMO

The objective of this in vivo study was to assess the effect of the root canal irrigation by negative and positive apical pressure on the expression of molecules that are an indicative of cell differentiation with mineralizing phenotype in teeth of dogs with incomplete rhizogenesis and induced periapical lesion. A total of 30 teeth (60 roots) were distributed into 3 groups (n=20): EndoVac®, Conventional and Control. After 90 days, the routine histotechnical procedures were performed and the sections were submitted to immunohistochemical technique for the staining of osteopontin (OPN), alkaline phosphatase (ALP) and the RUNX2 transcription factor in the apical and periapical regions of the roots. A semi-quantitative analysis of the positive immunostaining was performed and the intensity of the expression was classified in absent (0), mild (1), moderate (2), or intense (3). Scores data were statistically analyzed by the Kruskal-Wallis non-parametric test and Dunn post-test, and the significance level was set at 5%. RUNX2 immunostaining revealed that in the negative pressure group there was a significantly stronger (p<0.05) immunostaining in comparison to the control group. Regarding the OPN expression, it was not possible to detect a statistically significant difference between the groups (p>0.05). After analyzing ALP immunostaining, a statistically significant difference was observed between the groups (p<0.05), and the negative pressure group showed a markedly stronger mark immunostaining than the control group. The results of the present in vivo study allowed concluding that negative apical pressure irrigation presents mineralizing potential in immature teeth with apical periodontitis.


Assuntos
Periodontite Periapical , Dente , Animais , Cães , Irrigantes do Canal Radicular , Preparo de Canal Radicular , Tratamento do Canal Radicular
4.
Stomatologiia (Mosk) ; 99(1): 38-42, 2020.
Artigo em Russo | MEDLINE | ID: mdl-32125300

RESUMO

AIM: To evaluate the effectiveness of the innovative concept of dental medical technologies in patients with resected (amputated) roots of teeth with and without periodontal diseases. MATERIAL AND METHODS: Of the 516 examined patients with periapical destructive foci of infection of various genesis, 4 clinical groups of 24 people were randomly formed: (1) with a diagnosis of apical periodontitis of incisors, canines or premolars with individual milled transdental implants made of zirconium dioxide; (2) patients with a similar diagnosis and concomitant periodontitis of moderate severity with the same implants; (3) patients with periapical destructive process of molars without periodontitis with the same implants. Control group (4) included patients with similar diagnoses with resection of the root apex without implantation. Patients of the study groups were operated in accordance with the developed clinical protocols, including the manufacture and installation of individual transdental implants with fixation in the postoperative period, developed within the framework of tooth-preserving technologies of immobilizing structures. RESULTS: The reinforcement of teeth with resected roots with transdental implants together with immobilization of these teeth in the postoperative period restores the biomechanical characteristics of the tooth 2.7 times more effectively. However, there is a slight change in the mobility of the operated teeth in an earlier period (after 3 months), which is associated with the resorption of the bone-replacing agent used to fill the intraoperative defect and with the defective formation of bone tissue. The values of peritelomeric 6 months after the operation differ from the control by 1.4 units only.


Assuntos
Implantes Dentários , Periodontite Periapical , Periodontite , Humanos , Dente
5.
Compend Contin Educ Dent ; 41(3): 164-169, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32125169

RESUMO

This case of a patient with a significant history of caries, single-tooth restorations, and multiple extractions demonstrates the potential problems that may be associated with intermittent, single-tooth care and the importance of restorative clinicians thoroughly assessing the patient's medical and dental history. Patients may present with a failing biological system that could lead to unforeseen circumstances during treatment. When such a case presents itself, systematic and comprehensive risk assessment can play an instrumental role in enabling the clinician to adapt to any unexpected changes to the treatment plan and achieve the best possible outcome. Completed over the course of three phases, the treatment provided in this case was aimed primarily at managing structural and caries biomechanical risk and restoring acceptable function for the patient.


Assuntos
Cárie Dentária , Dente , Assistência Odontológica , Restauração Dentária Permanente , Humanos
6.
Am J Orthod Dentofacial Orthop ; 157(3): 422-428, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32115120

RESUMO

INTRODUCTION: This study aimed to investigate whether a digital light processing (DLP) printer could perform efficiently and with adequate accuracy for clinical applications when used with different settings and variations in the orientation of models on the build plate. METHODS: Digital impressions of the oral environment were collected from 15 patients. Subsequently, digital impressions were used to make 3-dimensional printed models using the DLP printing technique. Three variables of the printing technique were tested: placement on the build plate (middle vs corner), thickness in the z-axis (50 microns vs 100 microns), and hollow vs solid shell. After being printed with different printing techniques and orientations on the same printer, a total of 240 maxillary and mandibular arches were measured. These variables generated 8 printing combinations. Tooth and arch measurements on each model type were compared with each other. Intraobserver reliability of the repeated measurement error was assessed using intraclass correlation coefficient. RESULTS: All mean differences among the printing variations were statistically insignificant. The Bland-Altman plots verified a high degree of agreement among all model sets and printing variations. In addition, the measurements were highly reproducible; this was demonstrated by the high intraclass correlation coefficient for all measurements recorded. CONCLUSIONS: The DLP printer produced clinically acceptable models in all areas of the build plate, with hollow and solid model shells, and at its high-speed setting of 100 microns. The applications of the DLP printer tested should be a viable option for printing in a clinical environment at a high-speed setting while filling the build plate and printing with less resin.


Assuntos
Modelos Dentários , Impressão Tridimensional , Dente , Humanos , Maxila , Reprodutibilidade dos Testes
7.
Minerva Stomatol ; 69(1): 55-62, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32214067

RESUMO

INTRODUCTION: Dentistry, therefore implantology, prosthetics, implant prosthetics or orthodontics in all their variants, are medical and rehabilitative branches that have benefited greatly from these methods of investigation to improve the predictability of rehabilitations. We will examine the Finite Element Method and Finite Element Analysis in detail. This method involves the simulation of mechanical forces from an environment with infinite elements, the real one, to a simulation with finite elements. EVIDENCE ACQUISITION: The study searched MEDLINE databases from 2008 to 2018. Human use of FEM in vitro studies reported a contribution on oral rehabilitation through the use of FEM analysis. The initial search obtained 296 citations. After a first screening, the present revision considered the English-language works referred to human application of the FEM published in the last 10 years. Finally, 34 full texts were available after screening. EVIDENCE SYNTHESIS: The ultimate aim of this review is to point out all the progress made in the field of bioengineering and therefore, thanks to this, in the field of medicine. Instrumental investigations such as FEM are an excellent tool that allows the evaluation of anatomical structures and any facilities for rehabilitation before moving on to experimentation on animals, so as to have mechanical characteristics and satisfactory load cycle testing. CONCLUSIONS: FEM analysis contributes substantially to the development of new technologies and new materials in the biomedical field, being able to perform a large number of simulations without the need for patients or to perform human tests. Thanks to the 3D technology and to the reconstructions of both the anatomical structures and eventually the alloplastic structures used in the rehabilitations it is possible to consider all the mechanical characteristics, so that they can be analyzed in detail and improved where necessary. It is possible thanks to these methods to know what are the ideal characteristics of a material to promote an oral rehabilitation, so we know the characteristics, it remains only to take a step in the field of the industry for the construction of materials close to these characteristics.


Assuntos
Ortodontia , Dente , Bioengenharia , Odontologia , Análise de Elementos Finitos , Humanos , Estresse Mecânico
8.
Dental Press J Orthod ; 25(1): 80-88, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32215482

RESUMO

INTRODUCTION: The aesthetic analysis of a smile may be facilitated by the use of a template that provides several dental aesthetic references and support for the diagnosis, simplifying it and defining guidelines for the aesthetic planning of orthodontic and integrated treatments. OBJECTIVE: To describe a simple and objective procedure for the evaluation of smile aesthetics using the SmileCurves digital template (SCT), based on the superimposition of intraoral photographic images and close-up views of a smile. CONCLUSION: SCT is a simple and objective tool for the aesthetic analysis of a smile.


Assuntos
Estética Dentária , Dente , Registros , Sorriso
9.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(2): 86-92, 2020 Feb 09.
Artigo em Chinês | MEDLINE | ID: mdl-32074668

RESUMO

Objective: To investigate the influential factors related to the long-term effect of periodontal-orthodontic treatment in patients with aggressive periodontitis (AgP). Methods: A retrospective analysis was conducted in 25 AgP patients, who have received periodontal-orthodontic treatment in Peking University School and Hospital of Stomatology. Changes in the ratio of the residual alveolar bone height (RBH) was measured at three time points: baseline (T0), post orthodontic treatment (T1), and the last re-visit 3 years after orthodontic treatment (T2). Root abnormity was evaluated by observing periapical radiographs, and its relationship with alveolar bone loss after orthodontic treatment was analyzed. A multi-level analysis on factors related to the clinical outcome (alveolar bone height change) was performed. Results: Totally 693 teeth of 25 patients at T0 and T1 and 368 teeth of 14 patients at T2 were investigated. During the periodontal-orthodontic treatment, the RBH was mainly influenced by root abnormity (estimation value -2.392), tooth position (estimation value for upper teeth vs. lower teeth 3.139, and anterior teeth vs. posterior teeth -3.469) and the baseline RBH at T0 (estimation value -0.391) (P<0.05). Teeth with root abnormity, teeth in mandibular and anterior area, and teeth with higher RBH showed less change in T1-T0 RBH values. In the long-term follow-up, RBH was mainly influenced by tooth position (estimation value for upper teeth vs. lower teeth 3.735, and anterior teeth vs. posterior teeth -5.318), the baseline RBH and probing depth (PD) at T0. Teeth in mandibular and anterior area, teeth with higher RBH (estimation value -0.498) and PD (estimation value -1.594) (P<0.05) showed less change in T0-T2 RBH values. Conclusions: During orthodontic treatment, teeth with abnormal root, lower teeth, anterior teeth, and teeth with high RBH were unfavorable factors for bone gain. In the long-term observation, lower teeth, anterior teeth, teeth with high RBH and PD at first visit were unfavorable factors for bone gain.


Assuntos
Periodontite Agressiva/terapia , Má Oclusão/terapia , Dente/patologia , Perda do Osso Alveolar , Humanos , Ortodontia Corretiva , Estudos Retrospectivos
10.
Artigo em Inglês | MEDLINE | ID: mdl-32032415

RESUMO

This article reports a comprehensive restorative treatment using bulk-fill composites and discusses their properties and clinical performance. A 20-year-old man sought dental treatment due to the dark shade of his smile and multiple old amalgam fillings. Based on clinical and radiographic findings, and the patient's demand for tooth-colored fillings, treatment comprised enamel microabrasion and in-office dental bleaching, followed by the replacement of amalgam fillings by bulk-fill composites. Bulk-fill composites exhibit modifications in the filler size and shape or in the chemistry of monomers that allow them to be applied in thicker layers (4 to 5 mm), creating opportunities for simpler, faster, and more-efficient clinical procedures, as seen in the present report.


Assuntos
Resinas Compostas , Dente , Adulto , Materiais Dentários , Humanos , Teste de Materiais , Adulto Jovem
11.
Artigo em Inglês | MEDLINE | ID: mdl-32032416

RESUMO

This study aimed to create papilla with concentrated growth factor (CGF) in cases in which the interdental papilla was not able to fill the interproximal space (IPS) due to physiologic factors. A three-dimensional digital model of this space with the digital impression obtained from direct intraoral scanning of IPS was created. This study aimed to evaluate the efficacy of CGF in the regeneration of multiple adjacent papillary losses (MAPL), with the change in the IPS area calculated on intraorally scanned images obtained with digital impressions. This study included 160 teeth from 40 patients with 120 papillary losses. Patients were randomly allocated to the test group (TG) (n = 20), with 60 MAPL (three adjacent, lost interdental papillae per patient) receiving minimally invasive surgery with CGF, or the control group (CG) (n = 20), with 60 MAPL without surgery. A total of 480 images were uploaded to a software. The patients' age, gender, Plaque Index, bleeding on probing, and mean probing pocket depth values were evaluated. Papillary area (PA) were calculated between the two central, lateral-central, and lateral-canine teeth at baseline and posttreatment periods of 3, 6, and 12 months in both groups. Papillary filling percentage, keratinized-gingiva width, papillary thickness, thrombocyte, count and mean platelet volume were recorded in TG. Considering the variables in TG and CG, there was no difference in terms of age, gender, and periodontal parameters (P > .05). PA at 3, 6, and 12 months showed statistically significant differences from baseline values in TG (P < .001) but not in CG (P > .05). In TG, a moderate positive correlation was found between the midline papillary thickness and the 3-, 6-, and 12-month filling percentages (r: 0.506, P = .023; r: 0.509, P = .022; and r: 0.515, P = .02, respectively), and a high positive correlation was determined between thrombocyte count and the 6- and 12-month filling percentages (r: 0.733, P < .001; and r: 0.744, P < .001, respectively). CGF provided papillary regeneration in the treatment of MAPL and supported three-dimensional structure of the regenerated interdental papilla throughout 1 year.


Assuntos
Gengiva , Dente , Índice de Placa Dentária , Humanos , Retalhos Cirúrgicos
12.
Am J Dent ; 33(1): 17-24, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32056410

RESUMO

PURPOSE: To review and assess the literature on in vitro studies evaluating tooth bleaching efficacy considering the use of a negative control, type of tooth substrate, storage medium, color evaluation methods, and evaluation time points. METHODS: The following databases were searched: PubMed (MEDLINE), Web of Science. Search used Medical Subject Headings (MeSH) in PubMed in addition to free text. The following limits were applied: English, articles published between January 1989 and October 2017. Additional free text key terms included: in vitro, tooth bleaching, placebo, negative control, overall CIELAB color change (ΔE*ab), change in shade guide units (ΔSGU), tooth color stabilization, evaluation time points, bovine teeth, and staining. Search was repeated in Web of Science but no additional articles were identified. A total of 11 studies were included for qualitative and quantitative analysis. RESULTS: The meta-analysis of nine included studies that reported ΔE*ab values, revealed that the NC statistically exceeded the perceptibility threshold (PT) of 1.2 (P< 0.05). The estimate was 2.872 with lower and upper bounds of 1.955 and 3.790, respectively. CLINICAL SIGNIFICANCE: Randomized controlled trials are gold standards to evaluate bleaching efficacy of different materials. However, in vitro studies offer a way to screen for potential bleaching efficacy. It is vital to determine an appropriate cut-off value for determining bleaching efficacy in vitro and further apply for clinical relevance.


Assuntos
Sensibilidade da Dentina , Clareadores Dentários , Clareamento Dental , Descoloração de Dente , Dente , Animais , Bovinos , Cor , Peróxido de Hidrogênio
13.
Int J Prosthodont ; 33(2): 229-231, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32069349

RESUMO

Currently, 3D printers, especially digital light processing (DLP) printers, are widely used in clinical dentistry. However, due to the shrinkage property of resin, their accuracy is not optimal for full-arch dental model printing. To overcome these limitations, fused deposition modeling (FDM) with filament that undergoes minimum shrinkage was introduced. Accordingly, a combination of FDM printing with the specific tooth die output of DLP printing for the full-arch dental model is proposed in the present report.


Assuntos
Modelos Dentários , Dente , Impressão Tridimensional
14.
Am J Orthod Dentofacial Orthop ; 157(2): 194-204, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32005471

RESUMO

INTRODUCTION: This study aimed to compare the effects of a novel magnetic palatal expansion appliance (MPEA) during the expansion and maintenance period with that of a screw expansion appliance. METHODS: Based on previous research, the MPEA had a reactivation system that was modified for a broader working range and more stable expansion. Thirty-six male beagle dogs were assigned to a magnetic expansion (ME; n = 12), screwed expansion (SE; n = 12) or control (n = 12) group. Half of the dogs from each group were evaluated only during 5 weeks of activation, whereas the rest were evaluated for 5 weeks of activation and 8 additional weeks of retention. Nonmagnetic metal marking implants were implanted on both sides of the midpalatal suture of all dogs. Three-dimensional assessment of treatment and posttreatment dental and skeletal effects were conducted using cone-beam computed tomography. The width of the midpalatal suture, mineralization and deposition rate of bone, and fluorescence integral optical density were calculated during the expansion and retention periods using tetracycline fluorescence labeling. RESULTS: There were increases in the value of all cone-beam computed tomography parameters in the SE and ME groups during the expansion period, and the increase was significantly greater than that of the control group (P <0.01). However, there was no significant difference in the values of any parameters during the retention period. The width of the midline sutures, mineralization and deposition rate of bone, and integral optical density in the 2 experimental groups were significantly higher than those of the control group (P <0.01), and there was no significant difference between the SE and ME groups. After the retention period, the values of all tetracycline fluorescence evaluation parameters of the experimental groups decreased significantly. CONCLUSIONS: The novel MPEA with a reactivation system was able to expand the midpalatal suture effectively. Dental and skeletal expansion effects are similar to those of the screw expansion appliance. Wearing the appliance as a retainer can effectively maintain the expansion effect. The new bone formation rate was accelerated during the expansion process and decreased to normal levels during the retention period.


Assuntos
Fenômenos Magnéticos , Técnica de Expansão Palatina , Animais , Tomografia Computadorizada de Feixe Cônico , Suturas Cranianas , Cães , Masculino , Maxila , Palato , Dente
15.
Am J Orthod Dentofacial Orthop ; 157(2): 218-227, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32005474

RESUMO

INTRODUCTION: The aim of this study was to investigate the vestibular anatomy of teeth in samples of adult Italian and Mozambican subjects in ideal occlusion and permanent dentition and identify any anatomic characteristics that may influence bonding in the straight-wire technique. METHODS: Linear measurements and coordinates of each curve representing the clinical crown height and width of each tooth were acquired from digital models of each subject categorized to 1 of 2 groups: Italian (18 males, 22 females; mean age, 29.6 ± 5.7 years) or Mozambican (14 males, 15 females; mean age, 23.4 ± 5.9 years). All subjects had normal dentition and no previous orthodontic treatment, fillings, or prostheses. Method error and systematic error were calculated according to the Dahlberg formula (S2 = ∑ d2/2n) and dependent Student t test (P <0.05), respectively. Tooth symmetry was investigated through a paired-samples t test (P <0.05) and sex difference via an independent-samples t test (P <0.05). After neither asymmetry nor sexual dimorphism was found, all data were pooled, inverting the signs of the X coordinates and then mirroring data. Subsequently, a 2-samples t test (P <0.05) and a multivariate cluster analysis were performed on the mirrored data to compare the 2 groups and to identify any within-group diversity for number of clusters for each tooth. Means of all linear measurements and coordinates (crown height and width) calculated for each cluster were reported and compared using a standard 2-samples t test (P <0.05). RESULTS: Two clusters were identified for the maxillary second premolars and molars in Italian subjects, whereas in the Mozambican subjects, there were 2 clusters for the maxillary first premolars and lateral incisors and 3 clusters for the maxillary canines and central incisors. The mandibular arch was remarkably homogeneous, with only 1 cluster per tooth in each group. In the mandibular arch, statistical differences were recorded between ethnic groups in crown height at the central incisors and second molars and in crown width in the sector from the second premolar to the second molar. CONCLUSIONS: There were considerable differences both between and within racial groups in crown height, crown width, and numbers of clusters, which should be taken into account during bonding. Although single-bracket placement guides specific for ethnicity may be feasible for the mandibular arch, the significant diversity in number of clusters in the maxillary arch indicates that more accurate bracket placement guides that take into account such heterogeneity are required.


Assuntos
Odontometria , Dente , Adolescente , Adulto , Dente Pré-Molar , Dente Canino , Feminino , Humanos , Itália , Masculino , Dente/anatomia & histologia , Coroa do Dente , Adulto Jovem
16.
J Appl Oral Sci ; 28: e20190103, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32049131

RESUMO

OBJECTIVE: This study aimed to assess the association between tooth size and root canal morphology by using CBCT analysis. METHODOLOGY: In this retrospective study, tooth anatomic lengths (crown and root lengths, buccolingual and mesiodistal dimensions) of 384 patients were assessed and correlated with Vertucci's root canal morphology classification. Data was analyzed for gender-related differences using the independent sample t-test, ANOVA, and the Pearson's correlation for a possible relation between anatomic lengths and canal morphology. RESULTS: The maxillary first and second premolars showed a greater predilection for Type IV and II variants, respectively, while the mandibular first premolar showed a greater predilection for Type II canal system. The root canal system of the mandibular second premolar showed maximal diversity (47% Type I, 30% Type II, and 20% Type III). The dimensions were greater in men regardless of tooth type. The most significant relation (p<0.05) between the anatomic size and canal morphology was observed in the maxillary first premolars, followed by the mandibular canines (buccolingual dimension) and the lower second premolars (crown length). Negative correlations existed between the crown length and the patient's age for the anterior teeth and mandibular second premolar (r=-0.2, p<0.01). CONCLUSIONS: The most common canal formation for anterior teeth was the Type I. The anatomic lengths had the strongest influence on the canal configuration of the maxillary first premolar, with Type IV being the most common root canal system. The mandibular second premolars showed maximal diversity in the canal classification terms and had a significant correlation with their crown lengths. CLINICAL RELEVANCE: The complex relationship between the canal morphology and anatomic tooth sizes need meticulous awareness and recognition during endodontic procedures, in conjunction with the demographic variabilities.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Cavidade Pulpar/anatomia & histologia , Dente/anatomia & histologia , Adulto , Idoso , Análise de Variância , Cavidade Pulpar/diagnóstico por imagem , Feminino , Humanos , Masculino , Mandíbula/anatomia & histologia , Mandíbula/diagnóstico por imagem , Maxila/anatomia & histologia , Maxila/diagnóstico por imagem , Pessoa de Meia-Idade , Odontometria/métodos , Valores de Referência , Estudos Retrospectivos , Fatores Sexuais , Dente/diagnóstico por imagem , Estados Unidos
17.
J Appl Oral Sci ; 28: e20190148, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32049133

RESUMO

OBJECTIVE: The site of the sinus tract depends on the rate of resistance against abscess exudate drainage, bone morphology, and distance from the root apex to the outer cortical bone. To assess apical bone thickness in buccal and palatal/lingual aspects of maxillary and mandibular teeth, using a high-resolution cone-beam computed tomography (CBCT) system. METHODOLOGY: In total, 422 CBCT examinations were included in the study, resulting in a sample of 1400 teeth. The scans were acquired by PreXion 3D, with a high-resolution protocol. The bone thickness was taken as the distance between the center of the apical foramen and the buccal and lingual/palatal cortical bone. The quantitative variables were expressed as mean values±standard deviation. The independent samples were analyzed using the t-test or the Mann-Whitney test (p<0.05). RESULTS: The lowest mean value of bone thickness was observed in the buccal cortical bone of the upper canines (1.49 mm±0.86) and in the upper central incisors (1.59 mm±0.67). In premolar teeth, the lowest values were found in the buccal cortical bone of upper first premolars (1.13 mm±0.68). In the posterior teeth, the lowest values were found in the buccal cortical bone of upper first molars (1.98 mm±1.33). In the lower second molar region, the buccal cortical bone (8.36 mm±1.84) was thicker than the lingual cortical bone (2.95 mm±1.16) (p<0.05). CONCLUSIONS: The lowest mean values of bone thickness are in the buccal cortical bone of the maxillary teeth. In the mandible, bone thickness is thinner in the buccal bone around the anterior and premolar teeth, and in the lingual aspect of mandibular molars. All these anatomic characteristics could make the occurrence of the sinus tract more susceptible in these specific regions of the maxillary and mandibular alveolar bone.


Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Mandíbula/anatomia & histologia , Maxila/anatomia & histologia , Dente/anatomia & histologia , Adulto , Feminino , Humanos , Masculino , Mandíbula/diagnóstico por imagem , Maxila/diagnóstico por imagem , Odontometria/métodos , Valores de Referência , Estatísticas não Paramétricas , Dente/diagnóstico por imagem
18.
J Oral Sci ; 62(1): 103-106, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-31996511

RESUMO

This study aims to evaluate the effect of mouth rinses on the color, microhardness, and surface roughness of tooth enamel. Sixty dental blocks were collected from human third molars and divided in five groups (n = 12): the control group (CG) without immersion in mouth rinse, Listerine Zero, Colgate Plax Fresh Mint, Listerine Whitening, and Colgate Luminous White. The groups were subjected to initial color analysis; the microhardness and roughness of the enamel surfaces were evaluated. Next, the samples were subjected to immersion in mouth rinses or brushing with conventional fluoride toothpaste (CG) according to the manufacturer's instructions; after a 12-week treatment, the color, microhardness, and roughness were once again assessed and compared with the initial analysis. Data were tabulated and analyzed through a two-way analysis of variance (ANOVA) (color and roughness) followed by Tukey's test. Microhardness was analyzed through the Kruskal-Wallis test followed by Dunn's test; the level of significance was 5%. All groups immersed in mouth rinses had a higher level of microhardness loss than CG; additionally, all groups showed changes in the enamel surface. Enamel surface loss was observed using a roughness test, and the mouth rinses promoted a higher level of color changes than CG. Given the results, it can be concluded that the mouth rinses led to significant changes in tooth enamel.


Assuntos
Clareamento Dental , Dente , Esmalte Dentário , Humanos , Antissépticos Bucais , Cremes Dentais
19.
Head Face Med ; 16(1): 1, 2020 Jan 27.
Artigo em Inglês | MEDLINE | ID: mdl-31987041

RESUMO

INTRODUCTION: Cone-Beam Computed Tomography (CBCT) images can be superimposed, allowing three-dimensional (3D) evaluation of craniofacial growth/treatment effects. Limitations of 3D superimposition techniques are related to imaging quality, software/hardware performance, reference areas chosen, and landmark points/volumes identification errors. The aims of this research are to determine/compare the intra-rater reliability generated by three 3D superimposition methods using CBCT images, and compare the changes observed in treated cases by these methods. METHODS: Thirty-six growing individuals (11-14 years old) were selected from patients that received orthodontic treatment. Before and after treatment (average 24 months apart) CBCTs were analyzed using three superimposition methods. The superimposed scans with the two voxel-based methods were used to construct surface models and quantify differences using SlicerCMF software, while distances in the landmark-derived method were calculated using Excel. 3D linear measurements of the models superimposed with each method were then compared. RESULTS: Repeated measurements with each method separately presented good to excellent intraclass correlation coefficient (ICC ≥ 0.825). ICC values were the lowest when comparing the landmark-based method and both voxel-based methods. Moderate to excellent agreement was observed when comparing the voxel-based methods against each other. The landmark-based method generated the highest measurement error. CONCLUSIONS: Findings indicate good to excellent intra-examiner reliability of the three 3D superimposition methods when assessed individually. However, when assessing reliability among the three methods, ICC demonstrated less powerful agreement. The measurements with two of the three methods (CMFreg/Slicer and Dolphin) showed similar mean differences; however, the accuracy of the results could not be determined.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Imagem Tridimensional , Dente , Adolescente , Cefalometria , Criança , Assistência Odontológica , Humanos , Ortodontia , Reprodutibilidade dos Testes , Dente/diagnóstico por imagem
20.
J Prosthodont ; 29(2): 114-123, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31893566

RESUMO

PURPOSE: In-laboratory assessment by laboratory technicians may offer insight to increase clinical success of dental crowns, and research in this area is lacking. MATERIALS AND METHODS: Dentists in the National Dental Practice-Based Research Network enrolled patients in a study about single-unit crowns; laboratory technicians evaluated the quality of tooth preparations and impressions. The primary outcome for each crown was clinical acceptability (CAC), as judged by the treating dentist. A secondary outcome was "Goodness of Fit (GOF)," a composite score of several aspects of clinical fit, also judged by the study dentist. A mixed-effects logistic regression was used to analyze associations between laboratory technician ratings and the CAC and GOF. RESULTS: Dentists (n = 205) evaluated 3731 crowns. Technicians ranked the marginal detail of impressions as good or excellent in 92% of cases; other aspects of the impression were ranked good or excellent 88% of the time. Regarding tooth preparation, about 90% of preparations were considered adequate (neither excessive nor inadequate reduction). Factors associated with higher CAC were more preparation taper, and use of optical imaging. Factors associated with better GOF were higher impression quality, greater occlusal reduction, more preparation taper, and optical imaging. CONCLUSIONS: Overall quality of preparations and impressions was very high, as evaluated by laboratory technicians. Several clinical parameters were associated with higher CAC and GOF. Clinicians who struggle with crown remakes might consider less conservative tooth preparation, as well as using digital impression technology.


Assuntos
Pessoal de Laboratório , Dente , Coroas , Técnica de Moldagem Odontológica , Planejamento de Prótese Dentária , Odontólogos , Humanos
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA