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1.
Niger J Clin Pract ; 23(12): 1643-1647, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-33355815

RESUMEN

Aims: The aim of this study is to evaluate the gap distance of two cementation techniques for laminate veneers fabricated on maxillary anterior teeth using heat-pressed ceramic, finger pressure, and ultrasonic cementation techniques. Material and Methods: A total number of 42 extracted natural central incisors were prepared to receive ceramic laminate veneers, laminate veneers were constructed in the laboratory using heat-pressed ceramic according to manufacturer's instructions (IPS e.max). Ceramic veneers were divided into two groups and cemented using two different cementation techniques (Ultrasonic, finger pressure). Marginal gap distance was measured in microns at the margins using a stereomicroscope and special computer software (quantitative assessment). Results: The ultrasonic cementation technique recorded 63.3 ± 27.8 µm, which was significantly lower than the finger pressure technique (91.5 ± 21.4 µm). Conclusions: The ultrasonic cementation technique improved the gap distance at the tooth/ceramic interface when compared to the finger pressure technique using the light cure cement.


Asunto(s)
Cementación , Decoloración de Dientes , Cerámica , Coronas con Frente Estético , Calor , Humanos , Ensayo de Materiales , Cementos de Resina
2.
Shanghai Kou Qiang Yi Xue ; 29(3): 312-315, 2020 Jun.
Artículo en Chino | MEDLINE | ID: mdl-33043351

RESUMEN

PURPOSE: To compare the aesthetic effects of all-ceramic micro-veneer and minimally invasive ultra-thin veneer in repairing deformed anterior teeth. METHODS: One hundred and twenty patients with deformed anterior teeth were selected for aesthetic restoration. According to the patient's personal condition, a suitable repair protocol was selected. Patients in the experimental group (60 cases) were repaired with all-ceramic micro-adhesive surface, while patients in the control group (60 cases) were treated with minimally invasive ultra-thin veneer. The US Public Health Administration's Evaluation Criteria (USPHS) scores were recorded and compared 6 months, 12 months, and 24 months after restoration. Statistical analysis was performed using SPSS 25.0 software package. RESULTS: There was no significant difference in the integrity, color, marginal closeness, translucency and marginal staining of the restorations between the two groups 24 months after operation (P>0.05). The satisfaction rate of the aesthetics of the experimental group was significantly lower than that of the control group (71.60% vs 93.83%, P<0.05). The incidence of complications such as broken, detached and secondary caries during the follow-up period was significantly lower in the experimental group than in the control group (1.23% vs 11.11%, P<0.05). CONCLUSIONS: The results showed that there is no significant difference in the success rate between the two methods. All-ceramic micro-veneer technique has good long-term effect, fewer complications, easy to collapse and stain the lip margin, but it has a small amount of teeth preparation and a low incidence of pulpitis in the later period. Minimally invasive super-thin veneer has high aesthetic value, so it is necessary to choose appropriate aesthetic repair methods according to the patients' needs.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Cerámica , Color , Estética Dental , Humanos
3.
Chin J Dent Res ; 23(3): 183-189, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32974618

RESUMEN

OBJECTIVE: To design and fabricate 3D-printed rigid constraint guides for the tooth preparation for laminate veneers and to evaluate the accuracy of guide-assisted preparation. METHODS: Twenty maxillary right central incisor resin artificial teeth were randomly divided into two equal groups and prepared for laminate veneers. Tooth preparations were performed, assisted by guides in the test group and by depth gauge burs in the control group, and both were finished by freehand operation. The typodonts were 3D scanned before preparation, after initial preparation and after final preparation. The tooth preparation depths at each step, including initial preparation depth, final preparation depth and loss of tooth tissue during polishing, were measured by 3D deviation analysis. Statistical analyses were conducted to investigate differences. RESULTS: The initial preparation depth was 0.488 mm (median, quartile 0.013 mm) in the test group and 0.521 mm (median, quartile 0.013 mm) in the control group. A statistically significant difference was found between them (P < 0.05). The final preparation depth in the test group (0.547 ± 0.029 mm) was significantly less than that in the control group (0.599 ± 0.051 mm) (P < 0.05), and closer to the predesigned value (0.5 mm). There was no statistically significant difference in the loss of tooth tissue during polishing between the test group (0.072 ± 0.023 mm) and the control group (0.089 ± 0.038 mm) (P > 0.05). CONCLUSION: In maxillary central incisors, the tooth preparation for laminate veneers could be conducted using 3D-printed rigid constraint guides, the accuracy of which is better than that of depth gauge burs.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Incisivo , Rayos Láser , Preparación del Diente
4.
Rev. Odontol. Araçatuba (Impr.) ; 41(2): 15-21, maio-ago.2020. ilus
Artículo en Portugués | LILACS, BBO - Odontología | ID: biblio-1102664

RESUMEN

Atualmente é constante a demanda por sorrisos harmoniosos nos procedimentos clínicos odontológicos, resultando em estímulos no desenvolvimento de técnicas minimamente invasivas, sistemas adesivos e materiais que sejam capazes de reproduzir as características naturais dos elementos dentários. Para as reabilitações estéticas, em especial nas unidades anteriores, os laminados cerâmicos apresentam destaque, em virtude das suas características físicas e ópticas. Como procedimento alternativo, as facetas pré-fabricadas em resina composta foram reintroduzidas na Odontologia Restauradora, exibindo versatilidade, facilidade e relação custo/benefício satisfatórias. Objetivo: Relatar um caso, demostrando uma das opções viáveis para solucionar problemas estéticos, como diastemas e desproporções dentárias. Relato de caso: A paciente procurou atendimento odontológico especializado relatando insatisfação com o sorriso. Durante avaliação, foram observados desarmonia nas proporções dentárias, diastemas múltiplos, restaurações deficientes em resina composta e fraturas nas bordas incisais. Diante disso, após o registro fotográfico, foi realizado a seleção do formato e cor das facetas pré-fabricadas, assim como, do agente de cimentação. A seguir, foi feito o isolamento relativo, remoção das restaurações deficientes e os ajustes das facetas ao dente. Para preparação da peça, foi realizado a limpeza e aplicação do adesivo; nos preparos dentários, após asperização da superfície, houve o condicionamento e aplicação do adesivo, a seguir procedeu-se a etapa de cimentação e, acabamento e polimento. Conclusão: O tratamento realizado conseguiu suprir as necessidades estéticas do sorriso da paciente, mostrando que as facetas préfabricadas em resina composta apresentam estética satisfatória, facilidade de instalação, baixo custo em relação as peças em cerâmica e conservação da estrutura dentária(AU)


Introduction: In present days, there is a constant demand for harmonious smiles in the dental clinical procedure, resulting in encouragement on development in minimally invasive techniques, adhesives systems and materials that can be capable to reproduce natural dental elements. For aesthetic rehabilitation in special in the anterior units, the ceramic laminates are highlighted due to their optical and physical features. As an alternative procedure, prefabricated composite resigns have been reintroduced into restorative dentistry, showing satisfactory versatility, ease and cost-effectiveness. Objective: Report a case, showing one of the viable options to solve aesthetical problems as diastemas and dental disproportions. Case Report: The patient sought specialized dental care reporting dissatisfaction with the smile. During evaluation, disharmony in tooth proportions, multiple diastemas, composite deficient resigns restorations and incisal edges fractures were observed. Therefore, after the photographic register, the shape and colour of the prefabricated facets, as well as cementing agent were selected. Hereinafter, relative isolation, removal of the deficient restorations and adjustments of tooth's veneers were then performed. For the piece preparation, cleaning and adhesive application were performed; on dental preparations, after the surface roughening, the adhesive was etched and applied followed by finishing and polishing cementation. Conclusion: The treatment was able to supply the aesthetical needs of the patient's smile, showing that prefabricated composite resigns veneers present satisfactory aesthetics, ease installation, low cost compared to ceramic pieces and conservation of the dental structure(AU)


Asunto(s)
Femenino , Adulto , Resinas Compuestas , Coronas con Frente Estético , Diastema , Sonrisa , Estética Dental
5.
Rev. cient. odontol ; 8(2): e022-e022, mayo-ago. 2020. ilus
Artículo en Español | LILACS, LIPECS | ID: biblio-1119300

RESUMEN

El aumento en la demanda de tratamientos de odontología estética ha conducido al desarrollo de una comunicación multidisciplinaria entre las diferentes especialidades para lograr el éxito. La sonrisa gingival es un problema estético frecuente que consiste en una exposición excesiva de la encía durante la sonrisa y cuyas modalidades de tratamiento van desde una gingivectomía hasta el levantamiento de un colgajo para la remoción de hueso excedente. Las restauraciones con carillas directas de resinas compuestas son adecuadas para la conservación y la mejora estética del sector anterior, con óptima estética y durabilidad, además de ser consideradas un tratamiento mínimamente invasivo debido a sus conceptos conservadores de preservar la estructura dentaria.El presente caso clínico describe el tratamiento de un paciente joven con sonrisa gingival y alteración en forma y color de los dientes anteriores, mediante procedimientos mínimamente invasivos tales como la gingivectomía y la rehabilitación con carillas directas de resinas compuestas, con el objetivo máximo de preservar la estructura dentaria y una mayor predictibilidad estético-funcional. (AU)


The increasing demand of patients for esthetics dentistry treatments has led to the development of multidisciplinary communication between approaches among different specialties to achieve treatment success. The gummy smile is a frequent esthetic problem, which consists of excessive exposure of the gum when smiling. Treatment modalities range from gingivectomy to flap lift for the removal of excess bone. Restoration with direct veneers of composite resins is suitable for the preservation and esthetic improvement of the anterior sector, with optimal aesthetics and durability. In addition, minimally invasive treatment can be considered due to its conservative concepts of preserving the dental structure.The present case describes the treatment of a young patient with gummy smile and alteration in shape and color of the anterior teeth, through minimally invasive procedures such as gingivectomy and rehabilitation with direct veneers of composite resins with the objective of preserving the dental structure and greater esthetic - functional predictability. The present case report describes the treatment of a young patient with gummy smile. The shape and color of the anterior teeth were altered by minimally invasive procedures including gingivectomy and rehabilitation with direct veneers of composite resins with the objective of preserving the dental structure and providing greater esthetic - functional predictability. (AU)


Asunto(s)
Humanos , Femenino , Adolescente , Sonrisa , Resinas Compuestas , Coronas con Frente Estético , Estética Dental , Gingivectomía , Rehabilitación Bucal
6.
Shanghai Kou Qiang Yi Xue ; 29(2): 133-137, 2020 Apr.
Artículo en Chino | MEDLINE | ID: mdl-32626874

RESUMEN

PURPOSE: To analyze the effect of porcelain layer thicknesses and substrates on color properties and translucency of IPS e.max LT porcelain laminate veneers used to restore tetracycline stained teeth. METHODS: Porcelain specimens with different core and veneer thickness (veneer/core thickness: 0.25 mm/0.25 mm, 0.50 mm/0.25 mm, 0.25 mm/0.50 mm, 0.50 mm/0.50 mm, and 0.25 mm/0.75 mm) were fabricated by heat-press layering technique. CIE L*a*b* parameters were measured under simulated tetracycline backgrounds and black and white backgrounds by a spectrophotometer, color differences ΔE001 between specimens on simulated tetracycline backgrounds and backgrounds themselves and ΔE002 between specimens on simulated tetracycline backgrounds and white background were calculated. The translucent parameter(TP) was also calculated. The data were submitted to statistical analysis with SPSS 17.0 software package. RESULTS: ΔE001 increased with increase of thickness of the core and veneer layer, but there was no significant difference between 0.25 mm and 0.50 mm core thickness groups with 0.50 mm veneer in thickness (P>0.01). Except for light grey, ΔE002 decreased over other substrates with increase of thickness of the core and veneer layer, but there was no significant difference between 0.50 mm and 0.75 mm core thickness groups with 0.25 mm veneer in thickness (P>0.01). Both ΔE001 and ΔE002 were significantly different over different substrates(P<0.01). TP decreased as the increase of core and veneer thickness and TP was significantly different with different core and veneer thickness(P<0.01). CONCLUSIONS: Both the core/veneer thickness and the substrate have significant influence on color matching and masking ability of IPS e.max LT porcelain laminate veneers used to restore tetracycline stained teeth. As for IPS e.max LT porcelain veneers, the color property was the best when yellowish tetracycline stained teeth were restored, while the light grey was worst. The thickness of core and veneer has significant influence on the translucency of porcelain laminate veneers.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Cerámica , Color , Ensayo de Materiales , Tetraciclina
7.
Braz Oral Res ; 34: e063, 2020 Jun 24.
Artículo en Inglés | MEDLINE | ID: mdl-32609232

RESUMEN

This in vitro study aimed to evaluate the effects of different luting protocols on the thickness of luting interface of ceramic laminate veneers. Thirty-six lithium disilicate blocks (7 × 8 × 0.6 mm) were cemented onto bovine enamel. They were divided into 6 groups based on the luting protocol (no previous photoactivation of the dental adhesive; previous activation of the dental adhesive only on enamel surface; and previous photoactivation of the dental adhesive on both the enamel surface and inner surface of ceramic laminate) and the luting materials used (Single Bond Universal/RelyX Veneer and Tetric N Bond/Variolink Veneer). The luting interface thickness of ceramic laminate veneers was evaluated using a laser scanning confocal microscope (n = 6). The luting interface measurements were analyzed using 2-way ANOVA and the Tukey least significant difference test (α = 0.05). Prior activation of the adhesive on the dental enamel and inside the ceramic laminate exhibited higher luting interface thickness than that with no prior photoactivation of both luting materials (p < 0.05). Specimens cemented with Tetric N Bond/Variolink Veneer, submitted for prior photoactivation of the adhesive on the dental enamel and on both dental enamel and inner surface of ceramic, exhibited lower luting interface thickness than those luted with Single Bond Universal/RelyX Veneer (p < 0.05). The prior photoactivation of dental adhesives influenced the thickness of luting interface in laminate restorations. Tetric N Bond/Variolink Veneer yielded more satisfactory results than Single Bond Universal/RelyX Veneer when the adhesive was light activated.


Asunto(s)
Cerámica , Animales , Bovinos , Recubrimiento Dental Adhesivo , Cementos Dentales , Coronas con Frente Estético , Ensayo de Materiales , Cementos de Resina
9.
Zhonghua Kou Qiang Yi Xue Za Zhi ; 55(6): 373-377, 2020 Jun 09.
Artículo en Chino | MEDLINE | ID: mdl-32486565

RESUMEN

The minimal tooth reduction, esthetic appeal and biocompatibility of porcelain laminate veneers have made them one of the mainstream technologies for minimal invasive esthetic dental restorations. Cementation is a crucial step in ensuring retention, marginal seal and influencing the clinical longevity of veneer restorations. Experts from Society of Prosthodontics, Chinese Stomatological Association formulated operational specifications for the cementation of porcelain laminate veneers, so as to standardize the clinical operating procedures, achieve the long-term success of veneer restorations, and promote the application of porcelain laminate veneers.


Asunto(s)
Cementación , Coronas con Frente Estético , Porcelana Dental , Estética Dental
10.
Dent Med Probl ; 57(2): 177-183, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32559024

RESUMEN

BACKGROUND: Yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) is used as a core material in all-ceramic restorations. The delamination and chipping of a veneering ceramic are the most common complications in the case of zirconia-based restorations. OBJECTIVES: The aim of the study was to investigate the effect of the combined treatment of the zirconium dioxide (ZrO2) surface (airborne-particle abrasion with liner application) on the shear bond strength (SBS) of a veneering ceramic. MATERIAL AND METHODS: Thirty pre-sintered ZrO2 cuboidal specimens (VITA YZ® HT) were sub-divided into 3 groups: group C consisted of 10 specimens without treatment at the sintering stage; group SZ1 consisted of 10 specimens treated with airborne-particle abrasion (50-micrometer paricles of aluminum oxide - Al2O3; Korox® 50), and then coated with a 0.1-millimeter liner (IPS e.max® Ceram ZirLiner) after sintering; group SZ2 consisted of 10 specimens treated with airborne-particle abrasion (50-micrometer particles of Al2O3), and then coated with a 0.2-millimeter liner after sintering. Ceramic veneers (IPS e.max Ceram Dentin) were then applied using the layering technique. After that, the SBS tests were conducted. RESULTS: The results showed that the combined treatment of the ZrO2 surface significantly affected SBS (p < 0.01). The highest mean value was shown in group C (12.441 ±2.284 MPa), followed by group SZ2 (7.889 ±0.794 MPa), whereas the lowest mean value was observed in group SZ1 (5.580 ±0.843 MPa). CONCLUSIONS: The combined treatment of the pre-sintered ZrO2 surface significantly reduced the SBS of a veneering ceramic. However, the combined surface treatment with a liner thickness of 0.2 mm significantly enhanced the SBS of a veneering ceramic compared to the same combined treatment but with a liner thickness of 0.1 mm.


Asunto(s)
Recubrimiento Dental Adhesivo , Circonio , Cerámica , Coronas con Frente Estético , Ensayo de Materiales , Propiedades de Superficie
11.
J Esthet Restor Dent ; 32(5): 505-511, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-32564471

RESUMEN

OBJECTIVE: To assess the influence of time period on strength for different conventional Y-TZP porcelains. MATERIALS AND METHODS: Four types of porcelain were used. Porcelain powders were pressed in a steel die and fired in a furnace as recommended by the manufacturer. The blocks were sectioned into 2 mm-thick discs. Seventy specimens were fabricated from each type of porcelain. Of six jars, three contained 40 mL of dH2 O and three were dry. Ten specimens were placed in each jar and stored in an incubator at 37°C. A biaxial flexural strength test was performed for all specimens at the baseline and each succeeding year for all groups, for 3 years, using an Instron with a crosshead speed of 0.5 mm/min. RESULTS: The data were analyzed by ANOVA and Tukey at α = .05. At the baseline, the biaxial flexural strength of VitaVM9 was significantly higher than that of NobelRondo; however, there were no significant differences among Vita VM9 and Noritake CZR or NobelRondo, Lava Ceram, and Noritake CZR. There were significant reductions in the biaxial flexural strengths of all porcelains. CONCLUSIONS: After 3 years, all porcelain groups showed a significant decrease in biaxial flexural strength. The medium used is found to have no significant effects on the mean biaxial flexural strength. CLINICAL SIGNIFICANCE: Certain commercially available Y-TZP porcelains are susceptible to decrease in strength over time, which might impact the integrity of veneered zirconia restorations. This reduction in strength is among the most common reasons for the failure of veneered zirconia as reported in several studies.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Análisis del Estrés Dental , Resistencia Flexional , Ensayo de Materiales , Propiedades de Superficie , Circonio
12.
Eur J Prosthodont Restor Dent ; 28(3): 113-120, 2020 Aug 31.
Artículo en Inglés | MEDLINE | ID: mdl-32363813

RESUMEN

To evaluate fracture resistance of occlusal veneers made of glass-ceramic and zirconia with and without fatigue. Occlusal overlays (N=80; n=10 per group) were milled out of CAD/CAM materials, namely: a)LD:Lithium disilicate glass ceramic, b)LDS:Lithium-disilicate- strengthened aluminosilicate glass ceramic, c)ZLT:Zirconium dioxide ceramic and d)ZMT:Zirconium dioxide ceramic. The overlays were cemented on polymeric duplicates, randomly distributed to aging or non-aging conditions and loaded until fracture. Ultimate catastrophic failure strength(Fmax) and Initial crack formation load(Finitial) values were analysed using two-way ANOVA. For Finitial, material type and aging and their interaction resulted in significant values (p =⟨0.001). Finitial mean±SD values ranged from ZMTa (593 N ±205 N) to LDSb (118 N ±42 N). As for Fmax, the material type significantly affected the outcome (p⟨0.001), while aging type did not show an influence (p=0.795). The non-aged Fmax specimens values presented were: LDSa (877 N ±253 N)⟨LDa (2029 N ±412 N)⟨ZLTa (2049 N ±379 N)⟨ZMTa (2144 N ±333 N), LDSa being significantly lower (p⟨0.001). The aged Fmax values were: LDSb (1313 N ±599 N)⟨ ZLTb (1715 N ±453 N)⟨ZMTb (2018 N ±300 N)⟨LDb (2134 N ±289 N). LDS yielded significantly lower Fmax values without and non-significant less favourable results with aging. The mechanical properties following aging and lack of additional firing makes LDS an interesting restorative material for clinical application.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Cerámica , Diseño Asistido por Computadora , Análisis del Estrés Dental , Ensayo de Materiales , Circonio
13.
Dent Mater ; 36(6): 724-732, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32359850

RESUMEN

OBJECTIVES: to evaluate the probability of survival and failure modes of lithium-disilicate, feldspathic-ceramic, and resin-nanoceramic anterior veneers cemented on dentin analog substrates after sliding-contact step-stress accelerated life testing (SSALT). METHODS: A virtual incisor tooth preparation was produced with a reduction of 1.5mm at the incisal edge and of 0.7mm buccally. A .STL file of the preparation was generated and CAD/CAM based G10 dentin-analog material was used for testing. Laminate veneers were milled in three different materials: lithium-disilicate (LDS, E.max CAD), resin-nanoceramic (RN, Lava Ultimate), and feldspathic-ceramic (FELDS, Vita Blocks). SSALT was employed where a spherical indenter contacted the veneer, slided along its interface with G10 to lift off and start a new cycle at 2Hz in water. Qualitative fractography was performed. The probability of survival (90% confidence-bounds) was calculated for several load/cycle missions. RESULTS: The probability of survival for a mission of 50,000 cycles decreased from 50 up to 150N equally for all groups and were not different between them. At 200N, the probability of survival was significantly lower for FELDS (10%) compared to RN veneers (41%), whereas LDS presented intermediate values (22%). The characteristic strength of RN (247N) was significantly higher than LDS (149N), and FELDS (151N). In FELDS and LDS, hackles, wake hackles and twist hackles indicated the direction of crack propagation. In RN, hackles were observed. CONCLUSIONS: Differences in probability of survival were observed only at 180 and 200N between groups. Failure modes were similar with veneer fracture down to the tooth-analog substrate.


Asunto(s)
Diseño Asistido por Computadora , Porcelana Dental , Cerámica , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Coronas con Frente Estético , Ensayo de Materiales , Reproducibilidad de los Resultados
14.
Int J Esthet Dent ; 15 Suppl 1: S68-S87, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32467938

RESUMEN

An unfavorable relationship between the form and dimension of the dental arch and the number, dimension, and shape of the existing teeth can pose several esthetic, biologic, and functional problems. In this article, the various restorative options are discussed based on clinical and scientific evidence: Gap closure and substitution of missing teeth: restorative transformation of substituted teeth into homologous teeth with odontoplasty, direct composite, etched pieces or porcelain veneers. Gap opening and tooth replacement with all-ceramic adhesive bridges, including pontic site development. Gap distribution and restorative compensation with direct composite restorations, etched pieces or porcelain veneers. Gap shifting and restorative compensation with all-ceramic adhesive bridges, composite, etched pieces or veneers. Gap compensation by reconstructive compensation without orthodontics. The reconstructive tools including composite restorations, ceramic veneers, and adhesive bridges are discussed, and numerous cases are presented to illustrate the concepts.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Cerámica , Resinas Compuestas , Cementos Dentales , Estética Dental
15.
J Esthet Restor Dent ; 32(5): 487-495, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-32452164

RESUMEN

PURPOSE: A retrospective evaluation of extended anterior ceramic laminate veneers (EACVs) after a mean observational period of 10 years. METHODS: Thirty-one patients (20 females/11 males) underwent restoration with 101 adhesively luted, heat-pressed EACVs (maxilla, n = 65; mandible, n = 36). RESULTS: The 10 year survival rate was 91.8% (95% confidence interval [95%-CI]: 0.87;0.97). Eight ceramic fractures, one biological failure, and one change in treatment plan caused the observed failures. Seventy-seven of the 101 restorations remained intervention-free in service (success rate: 78.6% [95%-CI: 0.70;0.88]). Fourteen interventions were needed (nine recementations, two endodontic treatments, two composite fillings, and one fracture polishing). The jaw position (maxilla/mandible, survival P = .578/success P = .056) had no influence on the clinical performance. EACVs covering large areas of exposed dentin (>50%) were associated with a significantly increased risk (hazard ratio 2.98, P = .019) of needing a clinical intervention (success rate: 68.0% [95%-CI: 0.52; 0.84]). However, the degree of dentin exposure had no effect on the survival rate (P = .761). CONCLUSIONS: After a mean observational period of 10 years, mandibular and maxillary EACVs exhibited survival and success rates that were comparable. Significantly lower success rates were associated with large areas of exposed dentin (>50%). CLINICAL SIGNIFICANCE: Mandibular and maxillary EACV revealed 10-year survival rates comparable to those published for anterior metal-ceramic and glass-ceramic full-coverage crowns. Precaution should be taken not to expose dentin, and when large areas of dentin are exposed, different conditioning/luting strategies should be used.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Cerámica , Fracaso de la Restauración Dental , Femenino , Humanos , Masculino , Cementos de Resina , Estudios Retrospectivos
16.
Int J Prosthodont ; 33(3): 307-314, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32320184

RESUMEN

PURPOSE: To analyze the impact of different veneering techniques on the fracture load of telescopic secondary crowns made of a high-performance polymer (Ultaire aryl ketone polymer [UAKP]). MATERIALS AND METHODS: Zirconia primary crown models (taper of 0 degrees) were prepared (N = 48), polished, scanned, and divided into four veneering groups (n = 12 each): premanufactured, digital, full anatomical, and vestibular. For all groups except vestibular, a standardized telescopic secondary crown (thickness: 0.6 mm, circular margin: 1 mm) was constructed, adapted to the corresponding primary crown, milled from UAKP, and veneered. The veneered master crown was developed based on the premanufactured group. After surface polishing, all specimens were artificially aged in a chewing simulator (1.2 million cycles, 50 N, 1.1 Hz, between 5°C and 55°C). Fracture load was tested in a universal testing machine with a piston (Ø = 6 mm, 1 mm/minute). Fracture patterns were analyzed. For statistical analysis, Kolmogorov-Smirnov test and descriptive statistics followed by one-way ANOVA with post hoc Scheffé test were conducted (P < .05). RESULTS: Significant differences in fracture load were found between different veneering techniques (P < .001), with the highest values for the vestibular and digital groups, followed by the premanufactured group. Full anatomical veneering showed the significantly lowest fracture load (1,885 ± 397 N). For all specimens, cohesive brittle fractures with similar fracture patterns occurred, irrespective of the veneering technique. CONCLUSION: The veneering technique of telescopic secondary crowns made of high-performance polymer affects overall stability. All veneering techniques provided sufficient fracture load values for telescopic secondary crowns made of UAKP. Digital veneers seem the most recommendable.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Coronas , Diseño de Prótesis Dental , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Ensayo de Materiales , Polímeros , Circonio
17.
Gen Dent ; 68(3): 34-39, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32348241

RESUMEN

This case report describes the treatment of a patient who had molar-incisor hypomineralization associated with dental fluorosis, a diagnosis established through a comprehensive review of the clinical record, an intraoral clinical examination, and assessment of photographic records. First, dental hypersensitivity was treated with fluoride varnish, which was applied separately to each dental quadrant. Subsequently, the functional and esthetic reconstruction of the permanent maxillary central incisors was completed in a single session through the placement of direct composite resin veneers. After the treatment, the patient was reexamined monthly for 12 months to evaluate the durability of the restorations. At the 12-month follow-up, no fractures or pigmentations were observed, and only a slight loss of brightness of the restorations was noted. The dental hypersensitivity had been eliminated. When an adhesive restorative technique with composite resin is well executed, it is possible to obtain satisfactory and long-lasting esthetics and relief of painful symptoms.


Asunto(s)
Hipoplasia del Esmalte Dental , Fluorosis Dental/terapia , Resinas Compuestas , Restauración Dental Permanente , Coronas con Frente Estético , Estética Dental , Humanos , Incisivo , Diente Molar
18.
J Dent ; 97: 103346, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32325176

RESUMEN

OBJECTIVES: The fracture strengths of four types of occlusal veneers and a traditional full crown ceramic restoration and the influence of preparation design on the stress of restorations were examined. METHODS: Forty intact maxillary premolars randomly divided into five groups were prepared based on the demands of type O (occlusal surface coverage), OF (occlusal and lingual surface coverage), POF (occlusal, lingual, and mesial surface coverage), and POFP (occlusal, lingual, mesial, and distal surface coverage) veneers and full crown, and then restored by glass ceramic. Specimens were subjected to fracture resistance tests after cyclic loading. The fracture strengths and modes were analyzed statistically. The level of significance was set at α = 0.05. One maxillary premolar was prepared for type O, OF, POF, POFP veneer and full crown, and then scanned to establish finite element models. The mean fracture load was applied vertically to calculate the maximum principal stress on the ceramic. RESULTS: Type O veneer showed higher fracture strength than type POF and POFP veneers (P < 0.05). Both type O and OF veneers exhibited higher fracture strength than full crown (P < 0.05). No significant difference in failure mode was observed. The maximum principal stress for type O, OF, POF, POFP veneers, and full crown increased progressively and concentrated at the bonding surface directly beneath the loading area. CONCLUSIONS: Four types of occlusal veneer showed fracture strengths that considerably exceeded normal biting forces. They represent conservative alternatives to full crowns and present a viable treatment for severely worn teeth. CLINICAL SIGNIFICANCE: The occlusal veneers with different preparation designs, including type O, OF, POF and POFP veneers, show higher fracture resistances than traditional full coverage crowns that considerably exceed the normal biting forces. Therefore, these represent conservative alternatives to crown restorations and present a viable treatment for restoring severely worn teeth.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Diente Premolar , Cerámica , Coronas , Análisis del Estrés Dental , Ensayo de Materiales
19.
Oper Dent ; 45(5): 467-472, 2020 Sep 01.
Artículo en Inglés | MEDLINE | ID: mdl-32243254

RESUMEN

This article describes an indirect composite restoration technique for diastema closure and tooth lengthening with a noninvasive approach using regularly available materials such as silicone, composite resin, and an adhesive system. The procedure resulted in occlusal and functional improvement, with diastema closure, protrusive guide adjustment, and an increase in central incisor length. The procedure provided an adequate proportion of the central incisors with an esthetically natural appearance. It also resulted in simple, fast, and accurate manufacturing with a noninvasive esthetic indirect rehabilitation compared with more invasive preparation of ceramic veneers.


Asunto(s)
Coronas con Frente Estético , Diastema , Resinas Compuestas , Diastema/terapia , Estética Dental , Humanos , Incisivo
20.
J Esthet Restor Dent ; 32(4): 424-432, 2020 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-32270920

RESUMEN

OBJECTIVE: This in vitro study aims to evaluate load-to-failure of ceramic veneers with butt joint (BJ) and feathered edge (FE) incisal preparation designs, and to correlate these results to the failure mode of the restorations. MATERIALS AND METHODS: One hundred and forty-eight typodont teeth (customized Nissin A25A-UL19B) were divided into two different preparation configurations BJ and FE and two different loading angulations, 0° and 20°. Lithium disilicate ceramic veneers (IPS e.max CAD, Ivoclar Vivadent) were milled using computer-aided-design-and-computer-aided-manufacturing (CAD/CAM) techniques. Veneers were bonded to typodont teeth with resin cement (IPS Variolink Esthetic, Ivoclar Vivadent). Each group was loaded at the incisal edge using an Instron Universal Testing Machine at a crosshead speed of 0.01 mm/s till failure. RESULTS: Pairwise comparison showed veneers from the BJ groups had a significantly higher load-to-failure value compared to the FE groups. Veneers with a FE preparation design loaded at 20° angulation had the lowest load-to-failure value. CONCLUSIONS: Within the limitations of the present study, both incisal preparation designs and loading angulations have significant effects on the load-to-failure values of ceramic veneers. BJ group exhibits a significantly higher load-to-failure value compared to the FE group. CLINICAL SIGNIFICANCE: BJ incisal preparation is preferred over FE preparation design.


Asunto(s)
Porcelana Dental , Coronas con Frente Estético , Cerámica , Diseño Asistido por Computadora , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Ensayo de Materiales , Cementos de Resina
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