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1.
Am J Dent ; 33(4): 187-190, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32794392

RESUMO

PURPOSE: To evaluate in vitro the effect of a continuous mechanical polishing protocol, performed in different periods, on the surface roughness of acrylic resin teeth subjected to toothbrushing (Br). METHODS: Artificial acrylic teeth (n=30) were randomly divided into three groups according to the polishing protocol and toothbrushing (Br): Br; Br+Pol15 (Br associated with a biweekly polishing); Br+Pol30 (monthly polishing). Br group was subjected to a total of 89,000 brushing cycles. Polishing was performed by applying aluminum oxide paste to the specimens with a felt wheel coupled to an electric motor (5 seconds, 3,000 rpm) after each 741 and 1482 brushing cycles for Br+Pol15 and Br+Pol30 groups, respectively. A contact profilometer and an analytical balance were used to measure surface roughness and mass changes before (T0) and after 1, 2, 3, and 5 years (T4) of simulated toothbrushing. Scanning electron microscopy (SEM) images were obtained. Differences among groups were tested by means of two-way ANOVA/Bonferroni tests (P= 0.05). RESULTS: Toothbrushing gradually increased surface roughness [T0 - 0.16 (0.01); T4 - 0.30 (0.10); P< 0.001]. The tested polishing promoted a significant roughness reduction (P< 0.001) for both biweekly [T4 - 0.09 (0.01) ] and monthly [T4 - 0.13 (0.02) ] regimes, and it did not influence the mass alterations caused by toothbrushing. SEM showed a smoother aspect of the material surface subjected to biweekly polishing with less defects caused by brushing abrasiveness. CLINICAL SIGNIFICANCE: In order to reduce the effects of various deleterious factors on the properties of acrylic resin for removable prostheses during their period of use, a frequent mechanical polishing protocol could increase clinical performance and extend the lifespan of these appliances. Furthermore, a polishing protocol by means of a simple technique could be employed by patients in a home environment.


Assuntos
Polimento Dentário , Escovação Dentária , Resinas Acrílicas , Resinas Compostas , Humanos , Teste de Materiais , Microscopia Eletrônica de Varredura , Propriedades de Superfície , Dente Artificial
2.
Niger J Clin Pract ; 23(3): 434-436, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32134047

RESUMO

In today's dentistry, with the development of adhesive techniques and the improvement of resin-based materials, invasive restorative treatments have been replaced by minimally invasive or noninvasive restorative procedures. Fiber-reinforced adhesive bridges are minimal-invasive or noninvasive restorations that can be applied for definitive restoration in single tooth loss or short spans, where teeth or implant-supported fixed partial prosthesis cannot be applied. This case series describes the rehabilitation of three patients with anterior single tooth loss using the direct fiber-reinforced adhesive bridge. In all patients, esthetic and functional deficiencies in the missing tooth regions were solved with this minimally invasive technique, which is both cost-effective and conservative of tooth structures. During the three-year follow-up of these cases, there was neither fracture nor decementation in the restorations. Also, no caries or sensitivity was noted in the support teeth.


Assuntos
Resinas Compostas , Restauração Dentária Permanente/métodos , Prótese Parcial , Perda de Dente/cirurgia , Humanos , Procedimentos Cirúrgicos Minimamente Invasivos , Dente Artificial
3.
Eur J Prosthodont Restor Dent ; 28(1): 28-35, 2020 Feb 27.
Artigo em Inglês | MEDLINE | ID: mdl-32057198

RESUMO

The purpose of this study was to evaluate two-body wear and hardness of new generation artificial resin teeth. Ten specimens of four different artificial resin teeth (nanofill composite, nanohybrid composite, microfiller reinforced acrylic and highly modified acrylic) were prepared. Specimens were thermodynamically loaded in a dual-axis chewing simulator (50N, 240,000 cycles, 1.6 Hz, 5/55°C thermocycle). The wear loss was analyzed by using plaster replicas and 3D laser scanner. Vickers hardness was determined before and after thermodynamic loading. Mean Vickers hardness values of highly modified acrylic resin teeth were statistically significantly lower than nanohybrid composite (p⟨0.001), nanofilled composite (p⟨0.001) and microfiller reinforced acrylic resin teeth (p⟨0.001). Mean wear loss of highly modified and microfiller reinforced acrylic resin teeth were statistically significantly lower than nanohybrid composite (p⟨0.001) and nanofilled composite (p⟨0.001) resin teeth. There was a statistically significant difference in wear among the materials. The correlation between hardness and wear was not statistically significant.


Assuntos
Resinas Compostas , Desgaste de Restauração Dentária , Porcelana Dentária , Análise do Estresse Dentário , Dureza , Teste de Materiais , Propriedades de Superfície , Dente Artificial
4.
Dent Mater J ; 39(3): 435-443, 2020 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-31932547

RESUMO

The purpose of this study was to use a new scratch test and tensile test to evaluate the bond strength between artificial erosive enamel or dentin and self-adhesive resin composites as a coating material. Coronal enamel or dentin surface was exposed to an erosive cycle (artificial saliva [AS], pH:7.0 for 6.5 h and acidic carbonated beverages for 5 min, alternated 3 times per day) for the eroded-surface or stored in AS for the remineralized-surface. Two self-adhesive flowable resin composites, Fusio and LLB-CR6 (prototype), and a conventional flowable resin composite, BEAUTIFIL FLOW with self-etching primer system, Clearfil Mega Bond, were applied to enamel or dentin surfaces; and then the bond strengths were measured. For the eroded-surface, there were no significant differences in bonding strength among all materials, as assessed by the new scratch test. Thus, these self-adhesive flowable resin composites might be useful for coating materials on acid-eroded tooth surfaces.


Assuntos
Colagem Dentária , Adesivos Dentinários , Resinas Compostas , Cimentos Dentários , Dentina , Teste de Materiais , Cimentos de Resina , Propriedades de Superfície , Resistência à Tração , Dente Artificial
5.
Gerodontology ; 37(1): 72-77, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31820507

RESUMO

OBJECTIVE: This study aimed to compare the denture space of edentulous glossectomy patients with that of a control group from the perspective of artificial teeth positioning by using three-dimensional techniques. BACKGROUND: It is known that the shape of the denture space may be affected by tongue resection or reconstruction. However, the details of artificial teeth positioning in these patients remain unclear. MATERIALS AND METHODS: Six edentulous glossectomy patients aged 73-83 years and six normal participants aged 74-85 years participated in the study. Piezography was used to elucidate the characteristics of the denture space. For visualisation, piezographic records were scanned using cone beam computed tomography and the data were converted into stereolithographic format. Three-dimensional images of piezographic records were then constructed. Bucco-lingual widths of the mandibular occlusal surface were reproduced, and the camber line of the occlusal surface was set so as to simulate the position of the artificial teeth. The maximum chord of the occlusal surface on the left and right sides was recorded and measured. The discrepancy and ratio of the larger chord to the smaller chord between the right and left sides was calculated and subjected to statistical analyses using the Mann-Whitney U test. RESULTS: There were significant differences in discrepancy and ratio between the left and right in the control group and the glossectomy patients (P Ë‚ .01). The glossectomy patients showed a greater discrepancy and ratio than the control group. CONCLUSIONS: The simulated artificial teeth positions on the occlusal surface between the right and left side were asymmetric in glossectomy patients.


Assuntos
Boca Edêntula , Dente Artificial , Idoso , Idoso de 80 Anos ou mais , Planejamento de Dentadura , Prótese Total , Glossectomia , Humanos
6.
J Prosthodont Res ; 64(2): 231-234, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31699615

RESUMO

PURPOSE: This paper describes a method for making a customized denture flask using fused deposition modeling (FDM) by three-dimensional (3D) printing. We have proposed a new digital dental prosthesis using conventional dental base materials and artificial teeth. METHODS: Using the universal development system software, a denture-designed Standard Tessellation Language (STL) file and a denture flask STL file were superimposed, and the denture region was set as an empty space. After setting the offset value to 200µm between the denture base and teeth for artificial tooth positioning, the flask was created by FDM 3D printing. Conventional artificial teeth were inserted into the 3D-printed flask, and resin packing, finishing, and polishing were performed using the conventional method for fabricating the complete denture. CONCLUSIONS: The 3D printing materials used to make digital dental prostheses have not yet been fully validated. Therefore, the production of a 3D-printed denture flask, which can use conventional complete denture materials, presents a new alternative to the digital fabrication of dentures.


Assuntos
Desenho Assistido por Computador , Impressão Tridimensional , Planejamento de Dentadura , Prótese Total , Dente Artificial
7.
J Prosthet Dent ; 123(2): 236-238, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-31104811

RESUMO

Duplication of complete dentures by using digital technology is now widely practiced. However, the method of accepting only the cameo surface of dentures and forming a new artificial tooth arrangement by using analog techniques is still complex and time-consuming. A method for creating a new denture by implementing various artificial tooth arrangements by using a computer-aided design (CAD) software program after importing the existing denture cameo surface as is into the software is introduced. The technique helps solve patient discomfort due to occlusal problems in patients with complete dentures.


Assuntos
Dente Artificial , Fluxo de Trabalho , Desenho Assistido por Computador , Prótese Total , Humanos , Software
8.
J Prosthet Dent ; 121(6): 967.e1-967.e6, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31109725

RESUMO

STATEMENT OF PROBLEM: Analysis of the wear coefficient (k) of the superficial and deep layers of acrylic resin teeth can help predict denture durability, but little has been published on the wear coefficient of denture teeth. PURPOSE: The purpose of this in vitro study was to determine the k value for the superficial and deep layers of the acrylic resin teeth of 6 different brands by using the fixed-ball microabrasive wear method. MATERIAL AND METHODS: Six artificial tooth specimens of 4 commercial brands were tested: Artiplus IPN (Ar), Biotone IPN (Bi), Magister (Ma), Premium (Pr), Trilux (Tr), and SR Vivodent (Vi). Two specimens from each brand were created, one for the superficial layer and the other for the deep layer. The test was performed on fixed-ball microabrasive wear equipment set to operate at a constant normal force of 0.5 N and a rotation speed of 100 rpm. The test time periods were 5.00, 8.33, and 11.66 minutes. The characteristics of the wear craters were measured by using an optical microscope at a magnification of ×50 and Leica Microsystems software. Wear coefficient (k) values were deduced by using the Archard equation for abrasive wear, Q=k·N, and were analyzed by using 1-way analysis of variance, complemented by the Tukey HSD test (α=.05). A different analysis was used for each layer. RESULTS: The analysis of variance of the wear coefficient revealed significant differences among the groups regarding the superficial layers (P=.009). The Tukey HSD test showed that the k values for the superficial layers of Artiplus specimens were significantly lower than those of the Vivodent and Magister specimens. CONCLUSIONS: One brand (Ar) presented significantly lower wear coefficient value for the surface layer. No difference in wear coefficient values was found among the tooth brands for the deep layer.


Assuntos
Resinas Acrílicas , Dente Artificial , Dentaduras , Teste de Materiais , Propriedades de Superfície
9.
J Contemp Dent Pract ; 20(1): 94-100, 2019 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-31058620

RESUMO

AIM: To compare and evaluate the shear bond strength of the tooth-denture base junction when three different commercially available acrylic resin base bonded to acrylic teeth with and without application of methyl methacrylate monomer on ridge lap area. MATERIALS AND METHODS: A three-stepped cylindrical shaped die was customized. Sixty samples were fabricated with heat cure and self-cure acrylic resin with and without monomer application. A total of 60 samples were divided into three groups and six subgroups. • Group A-Twenty samples of Trevlon-HI heat-activated acrylic resin. • Subgroup A1-Ten samples of acrylic teeth bonded with Trevlon-HI heat-activated acrylic resin with the application of monomer on ridge lap area. • Subgroup A2-Ten samples of acrylic teeth bonded with Trevlon-HI heat-activated acrylic resin without application of monomer on ridge lap area. • Group B-Twenty samples of Trevalon heat-activated acrylic resin. • Subgroup B1-Ten samples of acrylic teeth bonded with Trevlon heat-activated acrylic resin with the application of monomer on ridge lap area. • Subgroup B2-Ten samples of acrylic teeth bonded with Trevlon heat-activated acrylic resin without application of monomer on ridge lap area. • Group C-Twenty samples of Trevlon-RR self-activated acrylic resin. • Subgroup C1-Ten samples of acrylic teeth bonded with Trevlon-RR self-activated acrylic resin with the application of monomer on ridge lap area. • Subgroup C2-Ten samples of acrylic teeth bonded with Trevlon-RR self-activated acrylic resin without monomer application on ridge lap area. RESULTS: Samples obtained from high impact heat cure acrylic resin with monomer application shows higher bond strength when tested under the universal testing machine. CONCLUSION: With and without monomer application on high impact polymethylmethacrylate (PMMA) resin and Heat cured resin it was found that high impact shows better bond strength. Trevlon HI monomer shows a greater increase in strength due to the presence of cross-linking agents. CLINICAL SIGNIFICANCE: The incorporation of mechanical surface treatments followed by monomer application significantly influences the bonding between denture teeth and denture base resin.


Assuntos
Colagem Dentária , Resinas Acrílicas , Análise do Estresse Dentário , Bases de Dentadura , Dentaduras , Teste de Materiais , Resistência ao Cisalhamento , Propriedades de Superfície , Dente Artificial
10.
Clin Implant Dent Relat Res ; 21(3): 473-481, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31067003

RESUMO

OBJECTIVE: To assess the clinical outcomes of implant-supported full-arch immediate prosthesis over 6 months of functions and analyze the risk factors of prosthetic complications. MATERIALS AND METHODS: This retrospective cohort study included patients who were treated with implant-supported full-arch restoration under immediate loading protocol between April 2008 and June 2016, and who wore the immediate prosthesis for more than 6 months. Medical charts were reviewed for the patients' general information, implant information, prosthetic information, and details of any prosthetic complications. Prosthetic complications were classified as follows: class I, prosthesis loosening; class II, fewer than three artificial teeth fractured; class III, three or more artificial teeth fractured; and class IV, resin base fractures. A cox proportional hazards ratio model was adopted to analyze the potential risk factors for class IV complications. RESULTS: A total of 114 patients (mean age, 56.73 ± 10.19 years) and 144 prostheses were included. The average wearing time for the immediate prosthesis was 21.9 months, and 62 (54.39%) patients experienced prosthetic complications, 30 of whom suffered from complications more than once. The most common complications were class II complications (12.3%) during the first 6 months of functioning and class IV complications (28.1%) during the entire function period. Class II complications were more common in the anterior region, while class IV complications occurred more often in the posterior region. The multivariable Cox proportional hazards regression model showed that a prosthesis in the maxilla (HR = 3.37, P = .001) and fiber reinforcement (HR = 0.39, P = .021) were significantly related to class IV complications. CONCLUSIONS: Implant-supported full-arch immediate prosthesis functioning over 6 months have a high prevalence of prosthetic complications. Fiber-reinforcement could reduce the prevalence of class IV complications when acrylic immediate prosthesis functioned longer than 6 months. Avoiding using the anterior teeth of the immediate prosthesis to tear pliable but strong food may prevent tooth fracture.


Assuntos
Prótese Dentária Fixada por Implante , Carga Imediata em Implante Dentário , Idoso , Falha de Restauração Dentária , Seguimentos , Humanos , Maxila , Pessoa de Meia-Idade , Estudos Retrospectivos , Dente Artificial , Resultado do Tratamento
11.
Am J Dent ; 32(1): 14-20, 2019 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-30834726

RESUMO

PURPOSE: To evaluate the hardness, roughness and color stability of artificial teeth after immersion in liquid disinfectant soaps. METHODS: Artificial teeth (Vipi Dent Plus, ArtiPlus and Biolux) were divided into four groups (n=15), according to the type of immersion solution: distilled water/control group (DW); liquid disinfectant soap Dettol (SD); liquid disinfectant soap Protex (SP); and liquid disinfectant soap Lifebuoy (SL). The immersion cycles occurred every day, for 8 hours at room temperature in each disinfectant solution, following immersion in distilled water for 16 hours at 37°C. All solutions were changed daily. Properties were evaluated after 0, 7, 14, 21 and 28 days of immersion. The data were analyzed with a mixed three-way ANOVA followed by the Bonferroni post-hoc test (α= 0.05). RESULTS: Vipi teeth presented significant reduction (P< 0.05) in hardness and roughness prior to 7 days of immersion in all solutions, including control group. These values, in general, were maintained during the 28 days. Biolux teeth, in general, did not present significant changes in hardness prior to immersion in any of the time intervals. The roughness of these teeth increased after 21 and 28 days of immersion (P< 0.05) in all the solutions. ArtiPlus teeth maintained stable roughness and hardness during the assessment period, regardless of the type of soap used. Color alterations were considered clinically acceptable. The liquid soaps may be an alternative for the disinfection of partial or total removable dentures. CLINICAL SIGNIFICANCE: The liquid disinfectant soaps tested did not significantly alter the hardness, roughness and color stability of the artificial teeth tested and may be an alternative for the disinfection of partial or total removable dentures.


Assuntos
Desinfetantes , Dente Artificial , Resinas Acrílicas , Imersão , Teste de Materiais , Sabões , Propriedades de Superfície
12.
Int Endod J ; 52(8): 1153-1161, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-30883828

RESUMO

AIM: To compare the educational outcomes using artificial teeth versus extracted teeth for pre-clinical endodontic training. DATA SOURCES: Literature searches of PubMed, Scopus, Cochrane Library, Trip Database, Web of Science and Open Grey databases were conducted from their inception until November 2018 with no language restriction. Hand searching of most likely relevant journals was performed. The review followed the PRISMA guidelines. STUDY ELIGIBILITY CRITERIA, PARTICIPANTS AND INTERVENTIONS: Studies that compared pre-clinical endodontic training using extracted teeth and artificial teeth were included. STUDY APPRAISAL AND SYNTHESIS METHODS: The quality of included studies was appraised by Joanna Briggs Institute Critical Appraisal tools. The findings were tabulated and summarized according to their outcomes with distinct narrative syntheses. RESULTS: Five studies were included. The component studies included 359 operators in total, mainly consisting of undergraduate students (97%, n = 349) and 10 endodontists (3%). Forty-seven per cent (n = 170) operated on artificial teeth only, whilst 19% (n = 67) worked primarily on extracted teeth, with the final treatment outcome being evaluated by independent observers using objective criteria. Operators in two studies (34%, n = 122) used both artificial teeth and ET and compared their experiences in surveys. Regarding technical outcomes, no significant differences between training with artificial teeth and extracted teeth were found, but the performance tended to be better in artificial teeth than extracted teeth. Operators trained solely on artificial teeth appeared to be adequately educated for subsequent root canal treatment (RCT) in the clinical setting. LIMITATIONS: Due to the scarcity of research on the topic overall, and the methodological variation between the studies, it was not possible to perform a quantitative analysis (meta-analysis). CONCLUSIONS AND IMPLICATIONS OF KEY FINDINGS: Based on the available evidence, the use of artificial teeth for pre-clinical endodontic training achieved similar educational outcomes compared to extracted teeth. However, the experiences reported by the operators diverged. Further studies assessing other artificial teeth available in the market testing other RCT procedures are necessary.


Assuntos
Endodontia , Tratamento do Canal Radicular , Dente Artificial , Endodontia/educação , Humanos , Tratamento do Canal Radicular/métodos , Dente
13.
J Prosthodont ; 28(1): e110-e117, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29888488

RESUMO

PURPOSE: Acrylic resin properties are susceptible to change over the duration of use, thereby decreasing prosthesis longevity. To make the material less susceptible to the action of external agents such as stain-causing liquids and cleaning solutions, polishing procedures are recommended. A specific mechanical polishing procedure performed regularly was evaluated regarding the biofilm adhesion, surface roughness (Ra), color stability (ΔE), and mass changes in acrylic resin artificial teeth. MATERIALS AND METHODS: Sixty artificial teeth divided into two groups (n = 30) were immersed in distilled water (WT) and coffee (CF). These groups were then subdivided (n = 10) according to the type of polishing procedure administered: no polishing, biweekly polishing (once every 2 weeks) (pol 1), or monthly polishing (once a month) (pol 2), using aluminum oxide paste and a felt polishing wheel attached to an electric motor at a speed of 3000 rpm. Properties were evaluated at baseline and after 4, 8, 12, and 24 months of simulated immersion. At the end, the adhesion of Candida albicans and Streptococcus mutans multispecies biofilm in all groups was assessed. RESULTS: The CF group showed an increased Ra and weight, and a significantly greater ΔE compared to the WT group. The polishing procedure reduced Ra and minimized the stains caused by coffee, without losing mass, with the biweekly regime more effective than the monthly regime. Also, polishing reduced the adhesion of biofilm in the CF groups, again with the biweekly regime the most effective. CONCLUSIONS: When performed regularly, the mechanical polishing procedure tested reduces the changes in artificial teeth subjected to immersion in coffee, with the biweekly frequency most effective regarding the properties evaluated.


Assuntos
Resinas Acrílicas/uso terapêutico , Aderência Bacteriana , Biofilmes , Polimento Dentário , Pigmentação em Prótese , Dente Artificial , Candida albicans/crescimento & desenvolvimento , Polimento Dentário/efeitos adversos , Polimento Dentário/métodos , Streptococcus mutans/crescimento & desenvolvimento , Propriedades de Superfície
14.
J Prosthodont ; 28(1): e148-e158, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29741216

RESUMO

This second part of a four-part series concerned with the development of nonanatomic denture occlusion follows nonanatomic tooth design from the time of Victor Sears' first nonanatomic tooth patent through the mid-1930s. Many of the designs featured in this series exhibit genius, while others are pure nonsense. Sears claimed that a new nonanatomic tooth design appeared every 9 months on average during the first 30 years of nonanatomic tooth production. Many current nonanatomic tooth patents are further refinements of those earlier designs. Part II reviews pioneering designs that appeared during the first dozen or so years of this paradigm shift in denture occlusion philosophy.


Assuntos
Articuladores Dentários/história , Planejamento de Dentadura/história , Dente Artificial/história , Dente/anatomia & histologia , Articuladores Dentários/tendências , Oclusão Dentária , Oclusão Dentária Balanceada , Planejamento de Dentadura/tendências , Prótese Total/história , Prótese Total/tendências , Dentaduras/história , Dentaduras/tendências , História do Século XX , Humanos , Mastigação , Dente Artificial/tendências , Estados Unidos
15.
J Prosthodont ; 28(1): e138-e147, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29508469

RESUMO

Part III of this four-part series about nonanatomic denture tooth development traces the evolution of this movement from the mid-1930s through the World War II era up to the early 1950s. By this time, the general preference for posterior denture occlusion had shifted from anatomic to nonanatomic teeth, and all the major denture tooth manufacturing companies listed at least one nonanatomic design in their inventories.


Assuntos
Articuladores Dentários/história , Planejamento de Dentadura/história , Dente Artificial/história , Dente/anatomia & histologia , Articuladores Dentários/tendências , Oclusão Dentária , Oclusão Dentária Balanceada , Planejamento de Dentadura/tendências , Prótese Total/história , Prótese Total/tendências , Dentaduras/história , Dentaduras/tendências , História do Século XX , Humanos , Dente Artificial/tendências , Estados Unidos
16.
J Prosthodont ; 28(1): e159-e171, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-29785794

RESUMO

This fourth and final part of a four-part series concerned with the development of nonanatomic denture occlusion follows nonanatomic tooth design from the time of Victor Sears' first nonanatomic tooth patent through the end of the 20th century. Part IV concentrates on nonanatomic teeth developed during the last five decades of the 20th century. Many of the designs featured in this series exhibited genius, while others are pure nonsense. Sears claimed that a new nonanatomic tooth design appeared every 9 months on average during the first 30 years of nonanatomic tooth production. Many current nonanatomic tooth patents are further refinements of those earlier designs.


Assuntos
Articuladores Dentários/história , Planejamento de Dentadura/história , Prótese Total/história , Dente Artificial/história , Dente/anatomia & histologia , Articuladores Dentários/tendências , Oclusão Dentária , Oclusão Dentária Balanceada , Planejamento de Dentadura/tendências , Prótese Total/tendências , História do Século XX , Humanos , Dente Artificial/tendências , Estados Unidos
17.
J Contemp Dent Pract ; 20(11): 1254-1259, 2019 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-31892675

RESUMO

AIM: To compare in vitro the remineralizing effect of toothpastes with casein phosphopeptide-amorphous calcium phosphate (FPC-FCA) and sodium fluoride on the artificial erosion of tooth enamel. MATERIALS AND METHODS: For the first phase of artificial erosion, group I was considered as the control group without treatment or erosion. For groups II and IV, the drink was used (Coca-Cola®), for groups III and V, the drink (Inca-Kola®), and the four groups were demineralized four times a day (every 3 hours for 2 minutes) for 5 days. In the treatment phase in groups II and III, brushing was performed with sodium fluoride paste (Colgate®), groups IV and V received brushing with FPC-FCA complex (MiPaste®), and for all groups, the same procedure was performed four times a day (every 3 hours for 5 minutes) for 90 days. At the end, the microroughness of the surfaces of all the groups was evaluated by means of a Rugosimeter (Mitutoyo). RESULTS: It was evidenced that the group of sodium fluoride presented a microroughness of 2.79 µm being the group of least remineralization, but the FPC-FCA complex showed a microroughness of 1.96 µm; however, the control group presented a microroughness of 3.20 µm, and the groups sodium fluoride, FPC-FCA compared to the control group proved to be statistically significant with a p < 0.05. CONCLUSION: The remineralizing effect of FPC-FCA (MiPaste®) complex proved to be greater than sodium fluoride paste (Colgate®) under artificial enamel erosive conditions. CLINICAL IMPORTANCE: The results of this research serve as a basis for industries to generate products that have the potential for remineralization against various erosive beverages that are consumed daily. How to cite this article: Pirca K, Balbín-Sedano G, Romero-Tapia P, et al. Remineralizing Effect of Casein Phosphopeptide-Amorphous Calcium Phosphate and Sodium Fluoride on Artificial Tooth Enamel Erosion: An In Vitro Study. J Contemp Dent Pract 2019;20(11):1254-1259.


Assuntos
Caseínas , Erosão Dentária , Fosfatos de Cálcio , Esmalte Dentário , Humanos , Fosfopeptídeos , Fluoreto de Sódio , Remineralização Dentária , Dente Artificial
18.
Stomatologiia (Mosk) ; 97(6): 57-60, 2018.
Artigo em Russo | MEDLINE | ID: mdl-30589427

RESUMO

The aim of the study was to improve the prosthetic treatment of patients with complete absence of teeth, taking into account the development of an algorithm for determining the size of artificial teeth by the morphometric parameters of the face. The study involved 76 elderly and senile adults with a full adentia of permanent teeth, who turned to the clinic for a prosthetic treatment. The results of examination and orthopedic treatment of this category of patients made it possible to develop an algorithm for determining the size of artificial teeth during prosthetics of dentition defects, taking into account the original correction factors obtained by calculation and analytical methods using mathematical-graphic modeling. The algorithm is based on the optimal ratio of diagonal facial parameters on both sides and the sum of the mesial-distal dimensions of 14 artificial teeth on the upper jaw, taking into account the correction factor of 2.2. The sum of the width of the artificial teeth of the frontal part on the upper jaw correlates with the total width of the crowns of 14 artificial teeth, taking into account the correction coefficient of 2.45. The value of the intermaxillary correction factor at a ratio of the width of 14 artificial teeth on the upper jaw to the similar dimensional characteristics of artificial teeth on the lower jaw is 1.07. Thus, to determine the size of artificial teeth in the design of denture prostheses, it is mathematically tested and clinically justified the advisability of using diagonal facial parameters and corresponding original correction factors.


Assuntos
Algoritmos , Dentição , Maxila , Dente Artificial , Adulto , Idoso , Face , Humanos , Maxila/anatomia & histologia
19.
Eur J Oral Sci ; 126 Suppl 1: 67-71, 2018 10.
Artigo em Inglês | MEDLINE | ID: mdl-30178557

RESUMO

Remarkable breakthroughs in the fields of developmental biology and stem cell biology during the last 15 yr have led to a new level of understanding regarding how teeth develop and how stem cells can be programmed. As a result, the possibilities of growing new teeth and of tooth bioengineering have been explored. Currently, a great deal is known about how signaling molecules and genes regulate tooth development, and modern research using transgenic mouse models has demonstrated that it is possible to induce the formation of new teeth by tinkering with the signaling networks that govern early tooth development. A breakthrough in stem cell biology in 2006 opened up the possibility that a patient's own cells can be programmed to develop into pluripotent stem cells and used for building new tissues and organs. At present, active research in numerous laboratories around the world addresses the question of how to program the stem and progenitor cells to develop into tooth-specific cell types. Taken together, the remarkable progress in developmental and stem cell biology is now feeding hopes of growing new teeth in the dental clinic in the not-too-distant future.


Assuntos
Bioengenharia , Dente Artificial , Dente/crescimento & desenvolvimento , Bioengenharia/métodos , Humanos , Regeneração , Células-Tronco/fisiologia , Dente/fisiologia
20.
Mater Sci Eng C Mater Biol Appl ; 92: 374-380, 2018 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-30184763

RESUMO

This work presents a novel approach for evaluating the occlusal examination of artificial tooth based on the mechanoluminescence (ML) materials. The rare earth doped strontium aluminate (SrAl2O4: Eu2+, Dy3+; SAOED) was chosen as the ML material, which was further composited with the commercial denture base resin (DBR) to determine its feasibility for the mechanics analysis of artificial tooth occlusion. To eliminate negative factors for occlusal analysis, SAOED was first optimized to exhibit a rapid decay of afterglow and enhanced ML intensity. The luminescent characterizations of the SAOED/DBR composites suggest DBR is a desirable elastic-supporter for nondestructive ML generation. Furthermore, the introduction of SAOED improved the mechanical performance of DBR, and its biocompatibility was maintained at the same time. These results suggest the feasibility of the idea to detect the mechanics in occlusal examination of artificial tooth based on ML. The bright and sensitive ML from the constructed standard artificial tooth models could guide clinicians to purposefully adjust the occlusal surface until a balanced occlusion established.


Assuntos
Oclusão Dentária , Luminescência , Estrôncio/química , Dente Artificial , Animais , Linhagem Celular , Disprósio/química , Európio/química , Dureza , Camundongos , Difração de Raios X
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