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1.
Scanning ; 2019: 1289570, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31741697

RESUMEN

The aim of this study was to evaluate the accuracy of two intraoral scanners used in the dental office. A molar fixed in a typodont was prepared for a ceramic onlay. The preparation was scanned using a high-resolution scanner (reference scanner) and saved as stereolithography (STL) format. The prepared resin molar was scanned again using the intraoral scanners, and all the scans were saved as well in STL format. All STL files were compared using metrology software (Geomagic Control X). Overlapping the meshes allowed the assessment of the scans in terms of trueness and precision. Based on the results of this study, the differences of trueness and precision between the intraoral scanners were minimal.


Asunto(s)
Almacenamiento y Recuperación de la Información/normas , Microscopía Confocal/métodos , Diente Molar/diagnóstico por imagen , Tomografía de Coherencia Óptica/métodos , Cerámica/química , Humanos , Incrustaciones/métodos , Rayos Láser , Microscopía Confocal/instrumentación , Microscopía Confocal/normas , Resinas Sintéticas/química , Programas Informáticos , Tomografía de Coherencia Óptica/instrumentación , Tomografía de Coherencia Óptica/normas
2.
J Appl Oral Sci ; 26: e20180004, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-30133672

RESUMEN

Objective This study aimed to evaluate the effect of the cavity preparation and ceramic type on the stress distribution, tooth strain, fracture resistance and fracture mode of human molar teeth restored with onlays. Material and Methods Forty-eight molars were divided into four groups (n=12) with assorted combinations of two study factors: BL- conventional onlay preparation with boxes made from leucite ceramic (IPS-Empress CAD, Ivoclar Vivadent); NBL- conservative onlay preparation without boxes made from leucite ceramic; BD- conventional onlay preparation with boxes made from lithium disilicate glass ceramic (IPS e.max CAD, Ivoclar Vivadent); NBL- conservative onlay preparation with boxes made from lithium disilicate glass ceramic cuspal deformation (µS) was measured at 100 N and at maximum fracture load using strain gauge. Fracture resistance (N) was measured using a compression test, and the fracture mode was recorded. Finite element analysis was used to evaluate the stress distribution by modified von Mises stress criteria. The tooth strain and fracture resistance data were analyzed using the Tukey test and two-way ANOVA, and the fracture mode was analyzed by the chi-square test (α=0.05). Results The leucite ceramic resulted in higher tooth deformation at 100 N and lower tooth deformation at the maximum fracture load than the lithium disilicate ceramic (P<0.001). The lithium disilicate ceramic exhibited higher fracture resistance than the leucite ceramic (P<0.001). The conservative onlay resulted in higher fracture strength for lithium disilicate ceramic. Finite element analysis results showed the conventional cavity preparation resulted in higher stress concentration in the ceramic restoration and remaining tooth than the conservative onlay preparation. The conservative onlays exhibited increased fracture resistance, reduced stress concentration and more favorable fracture modes. Conclusion Molars restored with lithium disilicate CAD-CAM ceramic onlays exhibited higher fracture resistance than molars restored with leucite CAD-CAM ceramic onlays.


Asunto(s)
Silicatos de Aluminio/química , Cerámica/química , Diseño Asistido por Computadora , Preparación de la Cavidad Dental/métodos , Porcelana Dental/química , Incrustaciones/métodos , Fracturas de los Dientes , Resinas Acrílicas/química , Análisis de Varianza , Resinas Compuestas/química , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Módulo de Elasticidad , Análisis de Elementos Finitos , Humanos , Ensayo de Materiales , Diente Molar , Poliuretanos/química , Valores de Referencia , Reproducibilidad de los Resultados , Estadísticas no Paramétricas
3.
Br Dent J ; 225(3): 223-228, 2018 08 10.
Artículo en Inglés | MEDLINE | ID: mdl-30072789

RESUMEN

Aims: To evaluate whether bonded resin composite restorations can effectively immobilise the tooth segments in teeth with a synthesised crack under loading, by exploring the impact of the restoration type (direct versus indirect composite resin) and restoration design (inlay versus onlay) on the fatigue resistance. Methods: Sound human third molars underwent large mesio-occluso-distal preparations and a groove was cut to simulate a crack. Standardised procedures were adopted and measures were taken during teeth selection so that systematic error and methodology bias were minimised. The teeth were randomly assigned to four groups. The specimens were submitted to cyclic loading and loaded until fracture or to a maximum of 185,000 cycles. The failure mode was recorded. Results: No failure was observed in 'direct' groups up to the 1000 N force. Survival analysis revealed statistically significant higher survival rates for 'direct' groups compared to 'indirect' groups (χ2 = 11.352, df = 1, p = 0.001) while there was no significant difference between 'inlay' and 'onlay' groups (χ2 = 0.015, df = 1, p = 0.901) (pooled data). Conclusions: Within the limitations of this in-vitro study, it can be concluded that the direct composite resin restorations sufficiently protected the cracked teeth regardless of the cavity design. As there was no statistically significant difference in survival rates between inlays and onlays it is not possible to favour one design type over the other.


Asunto(s)
Resinas Compuestas , Incrustaciones/métodos , Fracturas de los Dientes/terapia , Preparación de la Cavidad Dental , Análisis del Estrés Dental , Humanos , Incrustaciones/efectos adversos
4.
Gen Dent ; 66(4): 51-55, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-29964249

RESUMEN

This in vitro study evaluated the marginal microleakage of composite inlays luted with 3 different cement systems. The null hypothesis was that the luting materials would not influence dye penetration, showing the same degree of microleakage. Thirty-six sound molars were selected, mesio-occlusodistal cavities were prepared, and the teeth were randomly divided into 3 groups (n = 12). Composite resin inlay restorations were made and cemented using a dual-curing resin cement (Calibra), a light-curing flowable composite (Charisma Flow), or a self-adhesive resin cement (RelyX Unicem). The restored teeth were subjected to fatigue cycles and immersed in 0.5% basic fuchsin dye for 24 hours. Two orthogonal cuts were made to enable evaluation of dye penetration at the cervical and occlusal margins. The sections were evaluated with a 4-point scale ranging from 0 (no penetration) to 3 (penetration up to the cavity floor [occlusal margins] or axial wall [cervical margins]). The Calibra and Charisma Flow groups showed greater microleakage, notably at the cervical margins, whereas RelyX Unicem specimens showed the least dye penetration. Significant differences were found between the Calibra and Charisma Flow groups and between the Charisma Flow and RelyX Unicem groups (P < 0.05). No statistically significant differences were detected between the Calibra and RelyX Unicem groups. The microleakage associated with the flowable composite was significantly greater than that associated with both resin cements, results that discourage its use for luting of Class II composite inlays.


Asunto(s)
Filtración Dental/etiología , Incrustaciones/efectos adversos , Resinas Compuestas/efectos adversos , Resinas Compuestas/uso terapéutico , Cementos Dentales/uso terapéutico , Fracaso de la Restauración Dental , Humanos , Técnicas In Vitro , Incrustaciones/métodos , Diente Molar/cirugía , Cementos de Resina/efectos adversos , Cementos de Resina/uso terapéutico
5.
Niger J Clin Pract ; 21(6): 687-691, 2018 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-29888712

RESUMEN

Objective: The purpose of this study was to evaluate the fracture resistance and failure modes of onlay restorations prepared with different preparation designs. Materials and Methods: A total of 42 extracted, mandibular first molars (36, 46) were used and divided into six groups according to preparation design, as follows 1A: Anatomic preparation of cusps/rounded shoulder margin/occlusal groove; 1B: Flat preparation of cusps/rounded shoulder margin/occlusal groove; 2A: Anatomical preparation of cusps/occlusal groove; 2B: Flat preparation of cusps/occlusal groove; 3A: Complete anatomical reduction of cusps/rounded shoulder margin; 3B: Complete flat reduction of cusps/rounded shoulder margin groups; intact tooth: No preparation. Onlays were constructed with 0.5-mm copings of Zirconia ceramic. The copings were veneered with porcelain (IPS e. max Ceram). All samples were subjected to fracture resistance testing. Data were analyzed with Kruskal-Wallis and Bonferroni-Dunn tests. Results: Fracture resistance varied significantly according to preparation design. Among the anatomic occlusal preparation designs, fracture resistance was significantly lower in Group 3 when compared to Groups 1 and 2 (P < 0.05). Among the flat occlusal preparation designs, fracture resistance was significantly higher in Group 1 when compared to Groups 2 and 3 (P < 0.05). Conclusion: Preparation design affected the fracture resistance of onlay restorations. Cavities with flat occlusal preparation designs, a groove and shoulder margins (1B) resulted in the highest fracture resistance, whereas teeth prepared with a complete reduction of cusps and shoulder margins (3A) had the lowest fracture resistance.


Asunto(s)
Cerámica , Preparación de la Cavidad Dental/métodos , Porcelana Dental/química , Incrustaciones/métodos , Fracturas de los Dientes/prevención & control , Circonio , Cementación/métodos , Cerámica/química , Caries Dental , Humanos , Diente Molar , Preparación Protodóncica del Diente/métodos
6.
J Prosthet Dent ; 120(3): 396-402, 2018 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-29551386

RESUMEN

STATEMENT OF PROBLEM: Factors that may affect the marginal adaptation of computer-aided design and computer-aided manufacturing (CAD-CAM) restorations include preparation design, impression technique, and CAD-CAM system. The influence of impression technique and preparation design on CAD-CAM partial coverage restorations has not been fully addressed. PURPOSE: The purpose of this in vitro study was to investigate the influence of direct and indirect digital scanning techniques and 2 preparation designs on the marginal adaptation of CAD-CAM onlays. MATERIAL AND METHODS: Two mesio-occlusal buccal onlay preparations with reduction of the mesiobuccal cusp were made: conventional preparation (CP) with a 1.2-mm modified shoulder margin and modified preparation (MP) flat cuspal reduction without shoulder. Virtual models were generated from each preparation by using a digital scanner (BlueCam; Dentsply Sirona) from the plastic teeth (direct digital scan) or from the stone dies (indirect digital scan). Onlays were designed using a CAD-CAM system (CEREC 4.0; Dentsply Sirona), and nanoceramic resin blocks (Lava Ultimate Restorative; 3M ESPE) were milled using the CEREC MCX milling machine. Marginal discrepancy was evaluated using an optical stereomicroscope at ×25 magnification in 18 locations distributed along the margins of the preparation. The data were analyzed by using 3-way ANOVA followed by the Tukey HSD test (α=.05). RESULTS: CP presented a statistically significant reduced average marginal adaptation (59 ±50 µm) than did MP (69 ±58 µm) (P<.001). The Tukey HSD test showed the presence of a significantly larger marginal discrepancy in the mesial and buccal locations of MP when compared with CP. Regarding impression techniques, the buccal location presented the smallest average marginal discrepancy in restorations fabricated with indirect impression when compared with direct impression (42 ±33 µm and 60 ±39 µm) (P<.001). CONCLUSIONS: The results showed that conventional preparation with a modified shoulder margin presented improved marginal adaptation compared with modified preparation with flat cuspal reduction. Direct and indirect digital scanning techniques produced restorations within a clinically acceptable range; however, the indirect scanning technique resulted in the fabrication of restorations with superior marginal adaptation on the buccal location.


Asunto(s)
Diseño Asistido por Computadora , Técnica de Impresión Dental , Adaptación Marginal Dental , Diseño de Prótesis Dental/métodos , Incrustaciones/métodos , Preparación Protodóncica del Diente/métodos , Humanos
7.
Braz Oral Res ; 32: e005, 2018 Feb 01.
Artículo en Inglés | MEDLINE | ID: mdl-29412222

RESUMEN

Optical coherence tomography (OCT) has generally been used as a nondestructive technique to evaluate integrities of composite restorations. We investigated marginal and internal adaptations of ceramic inlay restorations with OCT and compared them to results with the silicone replica technique. Round-shaped class I cavities were prepared on 16 human maxillary first premolar teeth. Ceramic inlays were fabricated. Silicone replicas from inlays were obtained and sectioned to measure marginal and internal adaptations with a stereomicroscope (Leica Dfc 295, Bensheim, Germany). Inlays were cemented on respective teeth. Marginal and internal adaptations were then measured with the OCT system (Thorlabs, New Jersey, USA) in 200- µm intervals. Replica and OCT measurements were compared with independent samples t-tests. A paired t-test was used to evaluate the marginal and internal adaptations of each group (p < 0.05). Marginal and internal adaptations were 100.97 ± 31.36 and 113.94 ± 39.75 µm, respectively, using the replica technique and 28.97 ± 17.86 and 97.87 ± 21.83 µm, respectively, using OCT. The differences between the techniques were significant (p = 0.00 and p = 0.01, respectively). On evaluation within the groups, internal adaptation values were found to be significantly higher than the marginal adaptation values for the replica technique (p = 0.00) and OCT (p = 0.00). Therefore, the replica and OCT techniques showed different results, with higher values of marginal and internal adaptation found with the replica technique. Marginal and internal adaptation values of ceramic inlays, whether measured by replica or OCT techniques, were within clinically acceptable limits.


Asunto(s)
Cerámica/química , Adaptación Marginal Dental , Incrustaciones/métodos , Técnicas de Réplica/métodos , Tomografía de Coherencia Óptica/métodos , Humanos , Ensayo de Materiales , Estándares de Referencia , Valores de Referencia , Reproducibilidad de los Resultados , Cementos de Resina/química , Propiedades de Superficie
8.
Oral Maxillofac Surg ; 22(1): 65-69, 2018 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-29313149

RESUMEN

CONTEXT: Cranioplasty is a frequently performed procedure that uses a variety of reconstruction materials and techniques. In this technical note, we present refinements of computer-aided design-computer-aided manufacturing inlay cranioplasty. OBJECTIVE, DESIGN, AND SETTING: In an attempt to decrease complications related to polyether-ether-ketone (PEEK) cranioplasty, we gradually made changes to implant design and cranioplasty techniques. These changes include under-contouring of the implant and the use of segmented plates for large defects, microplate fixation for small temporal defects, temporal shell implants to reconstruct the temporalis muscle, and perforations to facilitate the drainage of blood and cerebrospinal fluid and serve as fixation points. RESULTS: From June 2016 to June 2017, 18 patients underwent cranioplasty, and a total of 31 PEEK and titanium implants were inserted. All implants were successful. CONCLUSIONS: These changes to implant design and cranioplasty techniques facilitate the insertion and fixation of patient-specific cranial implants and improve esthetic outcomes.


Asunto(s)
Diseño Asistido por Computadora , Incrustaciones/métodos , Cetonas , Polietilenglicoles , Cráneo/cirugía , Placas Óseas , Estética
9.
Dent Mater ; 34(4): 587-597, 2018 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-29366492

RESUMEN

OBJECTIVE: To compare mechanical performance and enamel-crack propensity of direct, semi-direct, and CAD/CAM approaches for large MOD composite-resin restorations. METHODS: 45 extracted maxillary molars underwent standardized slot-type preparation (5-mm depth and bucco-palatal width) including immediate dentin sealing (Optibond FL) for the inlays (30 teeth). Short-fiber reinforced composite-resin (EverX Posterior covered by Gradia Direct Posterior) was used for the direct approach, Gradia Direct Posterior for the semi-direct, and Cerasmart composite resin blocks for CAD/CAM inlays. All inlays were adhesively luted with light-curing composite-resin (preheated Gradia Direct Posterior). Shrinkage-induced enamel cracks were tracked by transillumination photography. Cyclic axial isometric chewing (5-Hz) was simulated, starting with a load of 200N (5000 cycles), followed by stages of 400, 600, 800, 1000, 1200, and 1400N (maximum 30,000 cycles each) until fracture or to a maximum of 185,000 cycles. Survived specimens were subjected to cyclic-load-to-failure test at 30-degree angle on the palatal cusp. RESULTS: Only small shrinkage-induced cracks were found in 47% of the direct restorations compared to 7% and 13% of semi-direct and CAD/CAM inlays, respectively. Survival to accelerated fatigue was similar for all three groups (Kaplan-Meier p>.05) and ranged between 87% (direct) and 93% (semi-direct and CAD/CAM). Cyclic-load-to-failure tests did not yield significant differences either (Life Table analysis, p>.05) with median values of 1675N for CAD/CAM inlays, 1775N for fiber-reinforced direct restorations and 1900N for semi-direct inlays. SIGNIFICANCE: All three restorative techniques yielded excellent mechanical performance above physiological masticatory loads. Direct restorations performed as good as inlays when a short-fiber reinforced composite-resin base was used.


Asunto(s)
Resinas Compuestas/química , Restauración Dental Permanente/métodos , Incrustaciones/métodos , Diseño Asistido por Computadora , Esmalte Dental/química , Materiales Dentales/química , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Humanos , Técnicas In Vitro , Ensayo de Materiales , Diente Molar , Cementos de Resina , Propiedades de Superficie , Transiluminación
10.
Braz. oral res. (Online) ; 32: e005, 2018. tab, graf
Artículo en Inglés | LILACS | ID: biblio-889474

RESUMEN

Abstract Optical coherence tomography (OCT) has generally been used as a nondestructive technique to evaluate integrities of composite restorations. We investigated marginal and internal adaptations of ceramic inlay restorations with OCT and compared them to results with the silicone replica technique. Round-shaped class I cavities were prepared on 16 human maxillary first premolar teeth. Ceramic inlays were fabricated. Silicone replicas from inlays were obtained and sectioned to measure marginal and internal adaptations with a stereomicroscope (Leica Dfc 295, Bensheim, Germany). Inlays were cemented on respective teeth. Marginal and internal adaptations were then measured with the OCT system (Thorlabs, New Jersey, USA) in 200- μm intervals. Replica and OCT measurements were compared with independent samples t-tests. A paired t-test was used to evaluate the marginal and internal adaptations of each group (p < 0.05). Marginal and internal adaptations were 100.97 ± 31.36 and 113.94 ± 39.75 μm, respectively, using the replica technique and 28.97 ± 17.86 and 97.87 ± 21.83 μm, respectively, using OCT. The differences between the techniques were significant (p = 0.00 and p = 0.01, respectively). On evaluation within the groups, internal adaptation values were found to be significantly higher than the marginal adaptation values for the replica technique (p = 0.00) and OCT (p = 0.00). Therefore, the replica and OCT techniques showed different results, with higher values of marginal and internal adaptation found with the replica technique. Marginal and internal adaptation values of ceramic inlays, whether measured by replica or OCT techniques, were within clinically acceptable limits.


Asunto(s)
Humanos , Cerámica/química , Adaptación Marginal Dental , Incrustaciones/métodos , Técnicas de Réplica/métodos , Tomografía de Coherencia Óptica/métodos , Ensayo de Materiales , Estándares de Referencia , Valores de Referencia , Reproducibilidad de los Resultados , Cementos de Resina/química , Propiedades de Superficie
11.
Oper Dent ; 42(5): E134-E138, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28829930

RESUMEN

Although rare, subcutaneous air emphysema can occur during dental procedures such as endodontic treatment, surgical extractions, and preparing a tooth for an indirect or direct dental restoration. We report the development of a subcutaneous air emphysema that was introduced through the periodontal ligament of an untreated premolar after the use of an air syringe to dry the tooth.


Asunto(s)
Diente Premolar/cirugía , Equipo Dental de Alta Velocidad/efectos adversos , Enfisema Subcutáneo/etiología , Humanos , Incrustaciones/efectos adversos , Incrustaciones/métodos , Masculino , Maxilar , Persona de Mediana Edad , Boca
12.
Artículo en Inglés | MEDLINE | ID: mdl-28402341

RESUMEN

This study presents a novel technique based on guided bone regeneration and onlay grafts for three-dimensional bone augmentation. This two-stage technique uses an autogenous cortical bone plate and collagen membranes to form a barrier containing a mixture of deproteinized bovine bone matrix, autologous blood, and bone grafted from intraoral sites. Five patients were treated. At 6 months postsurgery, a mean increase in bone volume of 1,062 mm³ was shown. Mean maximum linear augmentation was 3.65 mm. Histologic analysis of the regenerated areas revealed the presence of compact newly formed bone with no sign of inflammation. A total of 13 implants were placed. The patients were satisfied, and complications were not observed.


Asunto(s)
Aumento de la Cresta Alveolar/métodos , Placas Óseas , Trasplante Óseo/métodos , Implantación Dental Endoósea/métodos , Regeneración Tisular Guiada Periodontal/métodos , Incrustaciones/métodos , Membranas Artificiales , Anciano , Colágeno , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Reoperación
13.
J Am Dent Assoc ; 148(9): 671-676, 2017 09.
Artículo en Inglés | MEDLINE | ID: mdl-28366225

RESUMEN

BACKGROUND AND OVERVIEW: Besides indirect use in the laboratory and direct use for restorations, composites can be used in semidirect procedures. The authors describe the semidirect composite restoration technique by using a flexible die for large lesions in posterior teeth. CASE DESCRIPTION: The authors present illustrations of the clinical steps and the outcomes immediately after the procedures. The authors placed chairside inlay, onlay, and overlay composite restorations. The final esthetic outcome, along with function and anatomic form recovery, demonstrated that this might be a viable cost-effective alternative technique to laboratory-fabricated indirect restorations. CONCLUSIONS AND PRACTICAL IMPLICATIONS: Clinicians can restore large preparations in posterior teeth successfully with semidirect composite restorations in a single appointment by using the flexible die technique, resulting in satisfactory function and esthetic outcome.


Asunto(s)
Resinas Compuestas/uso terapéutico , Restauración Dental Permanente/métodos , Adulto , Técnica de Impresión Dental , Humanos , Incrustaciones/métodos , Persona de Mediana Edad , Diente Molar/cirugía
15.
Clin Oral Implants Res ; 28(1): 76-85, 2017 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-26749300

RESUMEN

OBJECTIVES: The aim of this study was to observe the sequential healing of onlay grafts in terms of the volumetric and histologic changes using different bone substances and absorbable membranes according to the presence of collagen cross-linking. MATERIAL AND METHODS: Four groups involving onlay grafting with different materials were randomly assigned to both sides of the maxillae of 15 beagle dogs: (i) control group without any treatment; (ii) group NN, bovine hydroxyapatite incorporated into a non-cross-linked collagen matrix (BHC) + non-cross-linked collagen membrane (NCCM); (iii) group NC, BHC + cross-linked collagen membrane (CCM); and (iv) group CC, porcine hydroxyapatite incorporated into a cross-linked collagen matrix + CCM. Radiographic and histological analyses were performed after three different healing periods: 4, 8 and 12 weeks. RESULTS: At week 4, the bone substances were well localized under the barrier membrane in groups NC and CC, while the bone substances became spread out and flattened in group NN. Similarly, the augmented height was significantly greater in groups NC and CC (2.55 and 2.51 mm, respectively; median) than in group NN (1.96 mm, P < 0.001, both). The percentages of newly formed bone were significantly higher at week 12 than at weeks 4 and 8 in all of the groups. The NCCM showed an earlier angiogenesis pattern than the CCM; however, earlier degradation was observed at week 12. CONCLUSION: Combining biomaterials with cross-linked collagen might contribute to maintaining its initial morphology with excellent biocompatibility in early healing period of lateral onlay grafts.


Asunto(s)
Materiales Biocompatibles , Trasplante Óseo/métodos , Colágeno/administración & dosificación , Incrustaciones/métodos , Cicatrización de Heridas/fisiología , Animales , Reactivos de Enlaces Cruzados , Perros , Maxilar/anatomía & histología , Maxilar/diagnóstico por imagen , Maxilar/cirugía , Microtomografía por Rayos X
16.
J Prosthet Dent ; 117(4): 459-462, 2017 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-27881326

RESUMEN

The esthetics and biocompatibility of ceramic resin-bonded fixed dental prostheses (RBFDPs) are regarded as better than those of their metal ceramic counterparts. However, a high incidence of complications in the posterior arches of ceramic RBFDPs initiated a process of continuous and evolving design development. This clinical report describes 2 successful restorations of a missing posterior tooth with monolithic zirconia RBFDPs with 2 different retainer designs: retentively prepared adhesive wings and inlays.


Asunto(s)
Dentadura Parcial Fija con Resina Consolidada , Incrustaciones/métodos , Pérdida de Diente/cirugía , Anciano , Cetirizina , Recubrimiento Dental Adhesivo/métodos , Diseño de Dentadura , Estética Dental , Femenino , Humanos , Persona de Mediana Edad , Procedimientos Quirúrgicos Mínimamente Invasivos/métodos
17.
Implant Dent ; 26(2): 232-237, 2017 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-27984336

RESUMEN

PURPOSE: The present study was undertaken to evaluate the healing pattern of xenogenic demineralized dentin onlay grafts in comparison with autogenous bone grafts to the rabbit tibia. MATERIAL AND METHODS: Eight 6-month-old New Zealand male rabbits were used in the experiments. Standardized sized dentin blocks from human premolars and similar autogenous bone blocks harvested from tibia were grafted as onlay blocks on each tibia (n = 8 × 2). All animals were killed after a healing period of 12 weeks. RESULTS: Healing was uneventful for all animals. In general, both the dentin and bone block grafts were fused to the bone, resorbed, and replaced by bone and connective tissue to a varying degree. Both types of grafts were still present after 12 weeks, on an average to approximately one third of the original sizes. Resorption cavities could be seen in the dentin with bone formation. Zones of osseous replacement resorption of the dentin could be noted. In both graft types, higher rate of bone formation was seen at the interface between graft and recipient site. CONCLUSION: Demineralized xenogenic dentin onlay grafts showed similar resorption characteristics as autogenous bone onlay grafts, being resorbed in a similar rate during 12 weeks. New bone formation occurred mainly in terms of replacement resorption in the interface between dentin/bone graft and native bone.


Asunto(s)
Dentina/cirugía , Incrustaciones/métodos , Tibia/trasplante , Animales , Autoinjertos , Trasplante Óseo/métodos , Xenoinjertos , Humanos , Masculino , Osteogénesis , Conejos
18.
Braz. dent. sci ; 20(4): 149-156, 2017. ilus
Artículo en Inglés | LILACS, BBO - Odontología | ID: biblio-878183

RESUMEN

The digital workflow in dentistry allows for complete digital processing of the restoration starting with the digital impression using an intraoral scanner to until the fabrication of final reconstruction. Recent advances in 3D printing technologies opened new possibilities also for dental technicians through which wax-up and casting procedures in the laboratories could be eliminated. In this clinical report, a technique is described where the pattern was fabricated using additive manufacturing for pressed lithium disilicate onlay restorations. (AU)


O fluxo de trabalho digital em odontologia permite o processamento digital completo da restauração começando com a impressão digital usando um scanner intraoral até a fabricação da peça final. Os avanços recentes nas tecnologias de impressão 3D abriram novas possibilidades também para os técnicos em prótese dentária através dos quais os procedimentos de cera e fundição nos laboratórios poderiam ser eliminados. Neste relato de caso clínico, descreve-se uma técnica onde o padrão foi fabricado usando a fabricação de aditivos para restaurações do tipo onlay em dissilicato de lítio injetadas. (AU)


Asunto(s)
Humanos , Masculino , Adulto , Impresión Tridimensional , Síndrome de Diente Fisurado/diagnóstico por imagen , Incrustaciones/métodos
19.
Biomed Res Int ; 2016: 4292761, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27830145

RESUMEN

Objective. The aim of this study was to compare to fracture resistance test of inlay restorations prepared using direct inlay technique (Gradia® Direct Composite) and Indirect Restoration System® (Gradia Indirect Composite) and CAD/CAD system (Vita Enamic® Block). Study Design. 48 noncarious extracted maxillary second primary molars were randomly divided into 4 groups with 12 in each group. All the teeth were prepared based on inlay class II preparations except for the control group. Other groups were restored with Gradia Direct Composite, Gradia Indirect Composite, and Vita Enamic Block, respectively. All restorations were cemented self-adhesive dual cure resin (3M Espe, RelyX™ Unicem Aplicap). A fracture test was performed using a compressive load. Results were analyzed using one-way analysis of variance and Duncan's post hoc multiple comparison tests (α = 0.05). Results. Vita Enamic Block and Gradia Indirect Composite showed significantly higher fracture resistance than Gradia Direct Composite (p < 0.05). There was no significant difference fracture resistance between Vita Enamic Block and Gradia Indirect Composite (p > 0.05). All restorations tested led to a significant reduction in fracture resistance (p < 0.05). Conclusion. In inlay restorations, Indirect Restoration Systems and CAD/CAM systems were applied successfully together with the self-adhesive dual cure resin cements in primary molars.


Asunto(s)
Incrustaciones/métodos , Diente Molar/fisiopatología , Fracturas de los Dientes , Diente Primario/fisiopatología , Diseño Asistido por Computadora , Humanos
20.
Arch. esp. urol. (Ed. impr.) ; 69(8): 485-493, oct. 2016. tab, ilus
Artículo en Español | IBECS | ID: ibc-156794

RESUMEN

Ureteral stents are the most commonly used urological implants. They are used for temporary as well as for long-term ureteral stenting. Amongst others, complications of ureteral stenting are encrustation and cellular adherence which, in turn, promotes urinary tract infection and can induce impaired healing in case of ureteral damage. Biofilm formation on urological implants leads to the protection of persisting bacteria from local defense mechanisms, thereby rendering persistent urinary tract infections more common. It seems clear that antibiotics cannot penetrate into biofilms adequately. Also, bacteria persist in biofilms in a state of reduced metabolism which further reduces antibiotic efficacy. Furthermore, bacteria develop resistance more quickly in biofilms. This paper tries to give an overview of the complex pathophysiological mechanisms that underlie stent encrustation as far as we know to date


Los catéteres ureterales son los implantes urológicos más utilizados. Se utilizan de forma temporal o a largo plazo. Entre otras complicaciones la utilización de catéteres ureterales incluye la incrustación y la adherencia celular que a su vez promueven la infección del tracto urinario y pueden empeorar la cicatrización en caso de lesión ureteral. La formación de biofilms en los implantes urológicos conlleva la protección de las bacterias persistentes de los mecanismos de defensa locales, haciendo de ese modo mas común la infección urinaria. Parece claro que los antibióticos no pueden penetrar adecuadamente en los biofilms. Además, las bacterias en los biofilms persisten en un estado de metabolismo reducido que disminuye más aún la eficacia de los antibióticos. Asimismo, las bacterias en los biofilms desarrollan resistencias más rápido. Este artículo intenta ofrecer una visión de conjunto sobre los mecanismos fisiopatológicos complejos que subyacen a la incrustación de catéteres hasta donde se conoce hoy en día


Asunto(s)
Humanos , Masculino , Femenino , Incrustaciones/instrumentación , Incrustaciones/métodos , Incrustaciones , Stents , Biopelículas , Infecciones Urinarias/diagnóstico , Infecciones Urinarias/terapia , Catéteres Urinarios/tendencias , Catéteres Urinarios , Cicatrización de Heridas/fisiología , Infecciones Urinarias/microbiología , Infecciones Urinarias/fisiopatología , Oxalato de Calcio/uso terapéutico , Factores de Riesgo , Ureasa/análisis
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