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1.
Quintessence Int ; 51(7): 538-544, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32500861

RESUMO

The prototyping protocol to evaluate and make the potential adjustments prior to finalization of the monolithic restorations was described by two clinical situations. In the first case report, following the digital impressions using an intraoral scanner (3Shape Trios, 3Shape) for an implant-supported four-unit fixed dental prosthesis, a digital design (3Shape Dental System, 3Shape) was performed and a prototype using subtractive CAM (milling) (PMMA, Telio CAD, Ivoclar Vivadent) was fabricated. The second case highlights the 3D-printed prototyping (additive CAM) (Sheraprint Model Plus UV, Shera) following digital impressions using an intraoral scanner and digital design in a patient requiring two opposing open-end three-unit fixed dental prostheses. By means of prototyping, the esthetic, fitting, and functional properties could be tested and the adjustments were completed on the prototypes. It is suggested that prototyping is an efficient tool that minimizes the clinical adjustment need for the final restoration while improving the communication between the dental practitioner and the technician.


Assuntos
Desenho Assistido por Computador , Planejamento de Prótese Dentária , Cerâmica , Coroas , Porcelana Dentária , Odontólogos , Humanos , Impressão Tridimensional , Papel Profissional
2.
Shanghai Kou Qiang Yi Xue ; 29(1): 13-18, 2020 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-32524114

RESUMO

PURPOSE: To study the optical properties of two common dental light curing units and the optical properties of the transmitted light after transmitting glass ceramics. METHODS: Two types of glass-ceramic disc named IPS e.max CAD and IPS Empress CAD were produced by CAD/CAM technology, and the colors of A2 and A3 were chosen for each type of glass ceramic, then divided into 4 groups. Eight discs were made 0.5 mm to 4.0 mm thick in each group, the total number was 32. Spectra irradiance meter and power meter were used to measure the central wavelengths and irradiance of 3 power modes of 2 new LED light curing units before and after transmitting glass-ceramic discs. Statistical analysis was performed using SPSS 25.0 software package. RESULTS: Under different power modes of light curing units, different types and colors of glass ceramics, the central wavelengths of transmitted light were significantly different (P<0.05). Under different power modes of light curing units, different types, colors and thicknesses of glass ceramics, the irradiance of transmitted light was significantly different (P<0.05). CONCLUSIONS: The power mode of light curing unit, the type and color of the glass ceramic have influence on the central wavelength of the transmitted light, but the thickness of the glass ceramic has no influence on the central wavelength of the transmitted light. The power mode of the light curing unit, the type, color, and thickness of the glass ceramic have influence on the irradiance of the transmitted light, in which glass ceramic thickness has the most significant effect on the attenuation of the irradiance of the transmitted light.


Assuntos
Cerâmica , Luzes de Cura Dentária , Cor , Desenho Assistido por Computador , Porcelana Dentária , Teste de Materiais , Cimentos de Resina , Propriedades de Superfície
3.
Shanghai Kou Qiang Yi Xue ; 29(1): 65-68, 2020 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-32524124

RESUMO

PURPOSE: It was aimed to apply computer virtual design and digital surgical templates to simulate postoperative position of tooth and guide the accuracy of socket preparation during tooth autotransplantation. METHODS: The study enrolled 10 patients who underwent tooth autotransplant surgery. Cone-bean CT (CBCT) data were imported into Proplan CMF 3.0 software. The donor tooth was transferred to the recipient site according to the occlusion and space situation. A digital template was designed to guide socket preparation. Computer-aided rapid prototyping (RP) technique was used to print the surgical template and tooth model. RESULTS: With computer virtual design and digital template, it was possible to accurately guide socket preparation in recipient site. The six-month follow-up results showed the periodontal space in the radiographs was continuous and intact. There was no mobility in all cases and the probing depth of the tooth was <4 mm. The related data showed a favorable survival and success rates of the donor teeth. CONCLUSIONS: Computer virtual design can successfully simulate postoperative position in tooth autotransplantation while simplifying the surgical procedure, and enhance the accuracy of socket preparation.


Assuntos
Cirurgia Assistida por Computador , Dente , Desenho Assistido por Computador , Tomografia Computadorizada de Feixe Cônico , Humanos , Impressão Tridimensional , Alvéolo Dental , Transplante Autólogo
4.
Shanghai Kou Qiang Yi Xue ; 29(1): 102-104, 2020 Feb.
Artigo em Chinês | MEDLINE | ID: mdl-32524132

RESUMO

PURPOSE: To evaluate the accuracy of implant digital impression,in order to provide guidance in digital implant prosthesis. METHODS: According to the requirements, 115 patients undergoing implantation were randomly selected. The implantation impression cap was placed and scanned with CBCT after esteosenesis. Oral cavity was scanned to make the 3D digital implantation model. The model data were obtained by scanning the digital resin implantation models. Based on the remaining teeth, the model data and CBCT data were matched in Nobel Clinicion software. RESULTS: The implantation impression cap in the patient's CBCT was completely matched and overlapped with the digital model in all of the occlusal, coronal and sagittal planes,which meant that the position, direction and angle of the implantation in the oral cavity were exactly the same as those in the digital model made by oral scanning. CONCLUSIONS: 3D digital resin model of oral scanning printing is completely accurate and can be popularized and applied in clinic.


Assuntos
Implantes Dentários , Técnica de Moldagem Odontológica , Desenho Assistido por Computador , Modelos Dentários , Humanos , Imageamento Tridimensional , Impressão Tridimensional , Software
5.
J Contemp Dent Pract ; 21(4): 367-371, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32584270

RESUMO

AIM: The aim of this study was to compare the adaptation of complete denture base (CDB) manufactured by three different techniques: conventional, milling, and three-dimensional (3-D) printing. MATERIALS AND METHODS: A master cast was duplicated to create 60 gypsum casts. Twenty casts (n = 20) were attributed to each group. In the computer-aided design and computer-aided manufacturing (CAD/CAM) groups (milling and 3-D printing), the 40 gypsum casts reserved for these two groups were scanned. An STL file was obtained and a master CDB was designed and then fabricated according to each technique. In the conventional group, a polyvinyl siloxane putty mold was obtained from the milled CDB, and this mold was used to fabricate 20 conventional denture bases by compression molding using the silicon-gypsum technique in a bronze flask. The inner surfaces of the obtained 60 CDB were scanned and superimposed over their corresponding master cast. Deviation analyses were calculated using digital subtraction technique. Five functional areas (posterior palatal seal, anterior border seal, crest of the ridge, maxillary tuberosities, and palate) were selected to evaluate the variations in CBD adaptation. RESULTS: Based on the results and color maps of all selected regions, milling technique offers the best adaptation. The crest of ridge in the conventional technique showed the least adaptation and the posterior palatal seal in the 3-D printing technique showed the best adaptation. CONCLUSION: Within the limitations of this study, the CAD/CAM fabrication techniques seem to offer better adaptation of CDB compared to the conventional fabrication technique. Milled CDBs presented the most homogeneous distribution of adaptation, yet the 3-D printing process seems a promising techniques that needs to be addressed and perfected. CLINICAL SIGNIFICANCE: The CAD/CAM technologies can help overcome many limitations related to conventional impressions and therefore should be well investigated to improve the edentulous patient's quality of life.


Assuntos
Bases de Dentadura , Planejamento de Dentadura , Desenho Assistido por Computador , Prótese Total , Humanos , Impressão Tridimensional , Qualidade de Vida
6.
IEEE Pulse ; 11(3): 38-40, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32559167

RESUMO

At this time many (if not all) colleges and universities are on lockdown, students have returned home, and classes have transitioned to online instruction. Students in capstone design courses around the country have no access to their school's maker spaces and test equipment. Their prototype parts may be stored in a locked maker space, making it difficult to build, test, and deliver prototypes to sponsors or clients at the end of the semester.z.


Assuntos
Engenharia Biomédica/educação , Infecções por Coronavirus/epidemiologia , Desenho de Equipamento , Pandemias , Pneumonia Viral/epidemiologia , Betacoronavirus , Engenharia Biomédica/instrumentação , Desenho Assistido por Computador , Currículo , Humanos , Estudantes , Universidades
7.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 38(3): 263-269, 2020 Jun 01.
Artigo em Chinês | MEDLINE | ID: mdl-32573132

RESUMO

OBJECTIVE: To investigate the effects of preparation height and cement space on the fit and retention of computer aided design (CAD)/computer aided manufacturing (CAM) zirconia crown, and to provide reference for the clinical design and fabrication of CAD/CAM crowns. METHODS: 3D printing system was used to fabricate resin abutment teeth with convergence angle of 2° and height of 1-3 mm. The models' optical impressions were collected by the three-shape scanner. Then, the cement spaces were set by Cradle CAD/CAM system at 10-50 µm to create an all-ceramic zirconia crown. The fit of the crowns was measured by using silicone rubber interstitial impression method. The retention of the crowns was measured by pull-off test with uniaxial tensile force after the crown was bonded. The data were analyzed by SPSS 22.0 soft-ware. RESULTS: When the preparation height was fixed, the fitness values of different cement space groups have statistical difference (P<0.05), whereas the retention values of different cement space groups have no statistical difference (P>0.05). The fitness values of different preparation height groups have no statistical difference (P>0.05), and the retention values of different preparation height groups have statistical difference (P<0.05) when the cement space was fixed. No interaction was observed between the cement space and the preparation height (P>0.05). CONCLUSIONS: When cradle CAD/CAM system is used to create a full crown in the clinic, the preparation height should be set to more than 3 mm, and the cement space should be set at 30 µm.


Assuntos
Coroas , Planejamento de Prótese Dentária , Desenho Assistido por Computador , Porcelana Dentária , Zircônio
9.
Compend Contin Educ Dent ; 41(6): i1-i4, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32551718

RESUMO

When properly implemented and with adequate clinician training, a complete digital workflow, from scanning, to designing, to milling, can provide a productive, cost-effective benefit to dental practitioners. As digital dentistry becomes increasingly prolific, same-day workflows, as demonstrated in a quadrant dentistry case, are improving efficiencies and reducing costs for dentists while producing exceptional outcomes.


Assuntos
Desenho Assistido por Computador , Fluxo de Trabalho , Planejamento de Prótese Dentária , Odontólogos , Estética , Humanos , Papel Profissional
10.
Int J Comput Dent ; 23(2): 129-138, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32555766

RESUMO

AIM: Despite the expanding implementation of intraoral scanning (IOS) devices, indirect digitization of conventional impressions or casts still represents the primary access to CAD/CAM. The aim of this study was to evaluate the accuracy of data acquired from impression scans and cast scans with respect to impression material and type of cast used. MATERIALS AND METHODS: A standardized titanium model for a four-unit fixed dental prosthesis (FDP) served as a testing model. Industrial computed tomography (CT) was applied, generating a reference data set. Four different impression materials were utilized (n = 12 per material): 1) Impregum Penta (polyether/group PE); 2) Imprint 4 Penta Super Quick Heavy + Super Quick Light (polyvinyl siloxane (PVS)/group PVS-I); 3) Dimension Penta H Quick + L (PVS/group PVS-D); and 4) Imprint 4 Preliminary Penta Super Quick (PVS/group PVS-P). Data were obtained from three different model situations, ie, impressions (group IMP), unsectioned plaster casts (group UNSEC), and sectioned casts (group SEC). The surfaces were digitized three times each using a laboratory scanner. The resulting test data were superposed with the reference data using a best-fit algorithm to evaluate accuracy. Statistical analysis was conducted using the Kolmogorov-Smirnov, Kruskal-Wallis, and Mann-Whitney tests (level of significance: P < 0.050). RESULTS: Imprint 4 Penta presented the highest overall accuracy, while Imprint 4 Preliminary Penta Super Quick displayed the poorest results. Regarding the model situation (impression scan vs cast scan), impression scans from Impregum Penta and Imprint 4 Penta showed superior results. CONCLUSION: Impression scans in combination with high-precision impression material results in the most accurate data.


Assuntos
Técnica de Moldagem Odontológica , Prótese Dentária , Desenho Assistido por Computador , Materiais para Moldagem Odontológica , Modelos Dentários , Humanos
11.
Int J Comput Dent ; 23(2): 161-181, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32555769

RESUMO

AIM: The purpose of this article is to present the preliminary clinical results obtained with a novel hybrid digital-analog technique, the solid index impression protocol (SIIP), which uses a solid index to capture accurate impressions of multiple implants for the fabrication of implant-supported fixed full arches (FFAs). MATERIALS AND METHODS: This pilot study was based on five patients, each treated with a FFA supported by four implants. Three months after implant placement, impressions were taken for all patients with an intraoral scanner (IOS) (direct digital impression) and with the SIIP, using a custom tray consisting of four hollow cylinders connected with a bar. This index was linked to the implant transfers and transferred to the laboratory, and the definitive FFAs were fabricated based on it. The outcomes of the study were the passive fit of implant superstructures and the accuracy of the models generated by the SIIP, inspected using a coordinate measuring machine (CMM) and reverse engineering software, and compared with the accuracy of direct digital impressions. RESULTS: Excellent clinical precision and passive fit were obtained in all five implant-supported FFAs fabricated with the SIIP. One year after delivery, all FFAs were functional without any complication. Differences in accuracy were found between the SIIP and direct intraoral scanning. CONCLUSIONS: The SIIP seems to represent a viable option for capturing accurate impressions for the fabrication of clinically precise implant-supported FFAs with a hybrid digital-analog workflow. Further studies are needed to confirm these results.


Assuntos
Implantes Dentários , Técnica de Moldagem Odontológica , Desenho Assistido por Computador , Modelos Dentários , Humanos , Projetos Piloto , Fluxo de Trabalho
12.
J Adhes Dent ; 22(3): 275-283, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32435768

RESUMO

PURPOSE: To evaluate the effect of surface conditioning methods and aging on the repair bond strength between resin composite and nanoceramic CAD/CAM resin. MATERIALS AND METHODS: Twenty-four blocks of nanoceramic CAD/CAM resin (NCR) (Lava Ultimate, 3M Oral Care) (10 x 5 x 2 mm3) and resin composite (Filtek Z350, 3M Oral Care) (RC) were made, embedded in acrylic resin, polished (#600, #800, #1200) and randomly divided into 8 groups (n = 12 each) according to surface conditioning methods (air abrasion with 30-µm CoJet [CJ] or air abrasion with 50-µm Al2O3 [AB]) and aging prior to repair (without aging, 24 h in water at 37°C; with aging 6 months in water at 37°C). The blocks were air abraded (20 s, 2.5 bar, 10 mm) using a standardized device. A layer of adhesive resin (Scotchbond Universal) was applied (20 s) and photopolymerized for 20 s. RC cylinders (Ø = 2 mm; h = 2 mm) were then bonded to the NCR substrates using a Teflon matrix and photopolymerized for 40 s. All specimens were thermocycled (10,000 cycles, 5°C-55°C) and submitted to the shear bond test (50 kgf, 0.5 mm/min) to measure repair strength. Data (MPa) were analyzed using 3-way ANOVA and Tukey's test (α = 0.05). Failure analysis was performed using stereomicroscopy (20X). RESULTS: ANOVA revealed a significant effect of only the "material" factor (p = 0.00). The group NCR6mCJ presented bond strengths (29.37 ± 5.41) which were significantly higher than those of the NCR24hCJ (20.88 ± 5.74) and RC groups (p < 0.05). The group RC24hCJ (19.71 ± 4.21) presented the lowest shear bond strength (p < 0.05). Failure analysis revealed predominantly type B mixed failures (adhesive+cohesive in the substrate material) except for the groups NCR24hCJ and NCR6mAB, where mainly type C failure (adhesive+cohesive at the RC) was observed. CONCLUSION: Air abrasion with Al2O3 particles or silicatization with CoJet followed by adhesive resin application are effective surface conditioning methods for the repair of nanoceramic CAD/CAM resin with resin composite.


Assuntos
Abrasão Dental por Ar , Resinas Compostas , Resinas Acrílicas , Desenho Assistido por Computador , Propriedades de Superfície
13.
J Prosthodont Res ; 64(3): 319-325, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32423658

RESUMO

PURPOSE: The purpose of this study was to evaluate the effectiveness of both a resin primer containing methyl methacrylate (MMA) and a silanizing agent on bonding to indirect resin composite blocks, using two types of build-up hybrid resin composites. METHODS: SHOFU BLOCK HC (Shofu) specimens were blasted with alumina, after which one of two surface treatments was applied: CERA RESIN BOND (Shofu, the Silane group) or HC primer (Shofu, the MMA group). Resin composites made using either Solidex Hardura (SDH, Shofu) or Ceramage Duo (CMD, Shofu) were built up and micro-tensile bond strength (µTBS) values were measured after storage in water for either 24h or 6 months (n=24 per group). The fracture surfaces after µTBS measurements and the resin block/build-up resin interfaces were observed by scanning electron microscopy (SEM). RESULTS: The bond strength of the Silane/SDH group significantly decreased after 6 months (p<0.001), whereas in the MMA group there was no significant loss after 24h or 6 months (p=0.99). In the CMD group, the bond strength after 6 months was significantly lowered in both the Silane group (p<0.001) and the MMA group (p<0.001), but the latter still showed greater adhesion. SEM images demonstrated that the matrix resin was partially destroyed at the fracture surfaces of the MMA group and fracture surface unevenness was observed. CONCLUSIONS: A primer containing MMA produced stronger bonding to CAD/CAM resin even after long-term aging compared to a silane treatment.


Assuntos
Colagem Dentária , Cimentos de Resina , Resinas Compostas , Desenho Assistido por Computador , Teste de Materiais , Microscopia Eletrônica de Varredura , Silanos , Propriedades de Superfície , Resistência à Tração
14.
J Contemp Dent Pract ; 21(3): 249-252, 2020 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-32434969

RESUMO

AIM: The purpose of this study was to survey all United States Air Force (USAF) general dentists regarding their experience with computer-aided design/computer-aided manufacturing (CAD/CAM) while in a dental school. Dental school graduation year and location was compared to the type and amount of CAD/CAM training and clinical experience during dental school to better understand the differences and influence of this technology. MATERIALS AND METHODS: A survey consisting of six questions was sent through e-mail to 546 general dentists in the AF Dental Corps in 2018 of which 306 replied (56% response rate). RESULTS: Dentists who graduated in 2005 or earlier and between 2006 and 2009 stated they did not receive CAD/CAM training in dental school, while more respondents in the group of graduation years 2014-2017 stated that they did receive training. About 11% of the respondents who graduated in 2014-2017 completed 6-10 restorations and 9% completed 11 or more restorations compared to the other year groups. More respondents who graduated from a dental school in the southwest and southeast regions of the United States reported completing more restorations compared to other school regions. CONCLUSION: Computer-aided design/computer-aided manufacturing is now becoming a prevalent curriculum in US dental schools, both as a core requirement and an elective. Its training platforms varied from lectures and literature reviews to preclinical laboratory. CLINICAL SIGNIFICANCE: More respondents in the groups of graduation years 2014-2017 had completed more CAD/CAM restorations compared to other year groups; however, most of the respondents did not feel their training was sufficient enough to use CAD/CAM technology independently.


Assuntos
Desenho Assistido por Computador , Planejamento de Prótese Dentária , Odontologia Militar , Odontólogos , Humanos , Faculdades de Odontologia , Inquéritos e Questionários , Estados Unidos
15.
Am J Dent ; 33(3): 157-160, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32470242

RESUMO

PURPOSE: To compare the gloss retention of four resin based materials, two direct resin composites (Tetric EvoCeram and Filtek Supreme) and two indirect resin composite CAD-CAM blocks (Tetric CAD and Lava Ultimate). METHODS: 36 samples of 1 mm thickness were readied of each test material and manually polished with polishing discs (Sof-Lex) up to the finest grit size. Three gloss measurements per sample were taken (one every 120 degrees of sample rotation) by means of a glossmeter (Novo-Curve) for a total of 60 values obtained per tested material. Samples of each material were then randomly divided into three equal groups and aged with 75% alcohol (Group 1), amine fluoride gel (Elmex gelée) (Group 2) or mechanical brushing (Group 3). Another set of gloss measurements was performed on all samples after 1 hour of aging. Gloss values were statistically evaluated by means of repeated measures ANOVA and Fisher's LSD post-hoc tests. RESULTS: Gloss retention values ranged from 59.0 (Tetric EvoCeram) to 70.9 (Lava Ultimate) for alcohol, from 59.3 (Filtek Supreme) to 67.5 (Lava Ultimate) for Elmex gelèe and from 33.3 (Tetric EvoCeram) to 53.4 (Lava Ultimate) for mechanical brushing. Statistical analysis revealed: (1) significant difference between intial and final gloss values for all materials and groups; (2) significant difference between final gloss values of all the materials in the alcohol group; (3) significant difference between final gloss values of Lava Ultimate and all the other materials in the Elmex gelèe group; (4) significant difference between final gloss values of Lava Ultimate and Tetric CAD with the other tested materials in the brushing group. CLINICAL SIGNIFICANCE: Direct resin composites in general are widely used, and CAD-CAM resin composite materials are becoming progressively more accessible. Making the choice between direct and indirect techniques is still a challenge, and understanding the advantages of CAD-CAM resin composites in the form of higher gloss retention, which translates into higher durability of esthetics, may be one the parameters facilitating the decision.


Assuntos
Resinas Compostas , Desenho Assistido por Computador , Polimento Dentário , Teste de Materiais , Propriedades de Superfície , Escovação Dentária
16.
Int J Esthet Dent ; 15 Suppl 1: S46-S53, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32467934

RESUMO

New digital technologies have significantly improved patient treatment modalities, especially in interdisciplinary cases. Tooth morphology can be modified at different stages of orthodontic treatment. Defining and achieving the final tooth form at the beginning or during the treatment can help the orthodontist to move teeth into the correct position quickly and more easily. The reshaping of anterior teeth can be obtained using digital technologies and CAD/CAM procedures. Composite resins are preferred to ceramics because they can be modified and adjusted whenever necessary. The parameters to assess the timing of restorative intervention are related to the age of the patient, degree of tooth eruption, and space availability in the interproximal area, especially if an additive approach is indicated to enlarge teeth.


Assuntos
Anormalidades Dentárias , Dente , Resinas Compostas , Desenho Assistido por Computador , Humanos , Planejamento de Assistência ao Paciente
17.
Artigo em Inglês | MEDLINE | ID: mdl-32233198

RESUMO

A technology called Trace Registration (TR) has been introduced to allow dynamic navigation of implant placement without the need for a thermoplastic stent. This study was undertaken in order to validate the accuracy of the TR protocol for dynamically guided implant surgery. A retrospective, observational, in vivo study was performed using dynamic navigation via the TR protocol. The preoperative cone beam computed tomography (CBCT) plan was superimposed and registered (aligned) with the postoperative CBCT scan to assess accuracy parameters. A total of 136 implants were placed in 59 partially edentulous arches. Mean deviation between the planned and actual position for all implants was 0.67 mm at the coronal level (entry point), 0.9 mm at the apical level, and 0.55 mm in depth, with an angle discrepancy of 2.50 degrees. Tracing 5 to 6 teeth tended to improve accuracy results compared to tracing 3 to 4 teeth. TR is as accurate as traditional registration and statically guided methods for implant surgery.


Assuntos
Implantes Dentários , Boca Edêntula , Cirurgia Assistida por Computador , Desenho Assistido por Computador , Tomografia Computadorizada de Feixe Cônico , Implantação Dentária Endo-Óssea , Humanos , Imageamento Tridimensional , Estudos Retrospectivos
18.
Am J Dent ; 33(2): 59-63, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32259408

RESUMO

PURPOSE: To evaluate Streptococcus mutans biofilm formation over different restorative dental materials. METHODS: Using a bioreactor over 72 hours, four commercially available ceramics were evaluated: IPS E-max Press, IPS E-max CAD, Lava Ultimate CAD-CAM, Vita Enamic and two resin composites (SR Nexco Paste and Brilliant NG). The results were evaluated using atomic force microscopy and confocal microscopy, the biofilm was stained and the arbitrary fluorescence units (AFU) quantified. RESULTS: The results showed that IPS E-max CAD had the lowest roughness values (4.29±1.79 nm), while the highest values were observed for Vita Enamic discs ( (77.13±17.35 nm). Analysis of S. mutans biofilm formation by AFU revealed lower values for IPS E-max CAD (6.77±1.67 nm); the highest values were found for Lava Ultimate (79.99±22.23 nm). Regarding the composite groups, SR Nexco Paste showed roughness values of 15.07±2.77 nm and lower arbitrary fluorescence units of 30.92±12.01 nm than Brilliant NT. There was a correlation between the surface roughness of ceramics and composite with S. mutans biofilm formation. CLINICAL SIGNIFICANCE: The adhesion of oral bacteria to restorative dental materials plays a key role in the success of dental treatment; the surface roughness influences the S. mutans biofilm formation.


Assuntos
Materiais Dentários , Streptococcus mutans , Biofilmes , Cerâmica , Desenho Assistido por Computador , Porcelana Dentária , Teste de Materiais , Propriedades de Superfície
19.
Int J Prosthodont ; 33(3): 272-276, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32320179

RESUMO

PURPOSE: To analyze the clinical behavior of screw-retained monolithic lithium disilicate (LDS) implant-supported single crowns (ISSCs) over a 1-year follow-up. MATERIALS AND METHODS: A total of 28 patients were restored with 45 screw-retained monolithic LDS (press-fabricated) ISSCs bonded to titanium bases in posterior sites. Modified United States Public Health Service criteria and Kaplan-Meier survival and success rates were evaluated. RESULTS: A total of 27 patients with 44 ISSCs were evaluated 12 months (mean ± standard deviation: 13.02 ± 2.28) after prosthesis delivery. No implant or crown failures occurred. The Kaplan-Meier survival and success rates were each 100% after 1 year. Minorly increased surface roughness was noted in the occlusal contact point areas of 9 ISSCs (20.5% Bravo rating). Marginal adaptation, color match, and anatomical form stayed favorable over time. CONCLUSION: Press-fabricated LDS monolithic screw-retained implant crowns appear to be a promising treatment option for posterior implants under short-term observation.


Assuntos
Desenho Assistido por Computador , Coroas , Parafusos Ósseos , Porcelana Dentária , Planejamento de Prótese Dentária , Prótese Dentária Fixada por Implante , Falha de Restauração Dentária , Humanos , Dados Preliminares , Estudos Prospectivos
20.
Int J Prosthodont ; 33(3): 333-340, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32320188

RESUMO

This report presents a digital technique for the fabrication of a two-piece hollow bulb maxillary obturator prosthesis. The procedure described resulted in an accurate prosthesis while avoiding the discomfort associated with analog impressions. The manipulation of a routine postoperative CT scan in conjunction with a 3D printer allowed for the fabrication of a 3D-printed anatomical cast, from which the two-piece hollow bulb obturator was fabricated. The obturator prosthesis framework was digitally designed and milled from a modified PEEK material, resulting in a lightweight prosthesis with excellent biocompatibility. The clinical and laboratory steps involved are described.


Assuntos
Desenho Assistido por Computador , Prótese Maxilofacial , Planejamento de Prótese Dentária , Cetonas , Polietilenoglicóis , Impressão Tridimensional
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