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1.
Int J Oral Maxillofac Implants ; 36(3): 503-519, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34115065

RESUMEN

PURPOSE: To review the evidence from the clinical outcomes of immediately loaded implants with fixed prostheses in edentulous maxillae. MATERIALS AND METHODS: An electronic search was performed in PubMed/MEDLINE, Embase, and Cochrane to identify studies investigating the outcome of implants subjected to immediate loading with fixed dental prostheses in edentulous maxillae. Only clinical studies with more than 10 patients and a mean follow-up time of more than 12 months were included. Meta-analysis was utilized to compare the clinical outcomes between immediately loaded implants and conventionally loaded implants. For immediately loaded implants, a cumulative implant survival rate (ISR) was weighted by the duration of follow-up and number of implants. The weighted marginal bone loss (MBL) was also assessed. RESULTS: A total of 33 studies (16 retrospective studies and 17 prospective studies) were included, which involved 2,635 patients and 12,480 implants. Meta-analysis did not reveal a significant difference of ISR or MBL between the two loading groups. For immediately loaded implants, the weighted cumulative ISR was 95.53% (median: 97.50%) with a mean follow-up of 46.07 months (SD: 30.92). Fourteen studies reported on the MBL of implants, and the mean MBL was 1.19 mm (SD: 0.88) with a mean period of 57.70 months (SD: 32.56). The results should be interpreted with caution due to the lack of randomized controlled trials (RCTs) and the heterogeneity of the data. CONCLUSION: Despite the lack of RCTs, immediate implant loading with a fixed prosthesis in the edentulous maxilla seems to be a reliable treatment alternative with a high ISR, when appropriate inclusion/exclusion criteria are followed.


Asunto(s)
Implantes Dentales , Carga Inmediata del Implante Dental , Arcada Edéntula , Implantación Dental Endoósea , Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental , Estudios de Seguimiento , Humanos , Arcada Edéntula/cirugía , Maxilar/cirugía , Resultado del Tratamiento
2.
Int J Oral Maxillofac Implants ; 36(3): 581-586, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34115075

RESUMEN

PURPOSE: The aim of this study was to evaluate the clinical use of a high-performance polymer, polyether ether ketone (PEEK), as a material for use in provisional fixed dental prostheses (FDPs) that can be retained by reciprocated guide surfaces of hexagonal-shaped healing abutments during dental implant treatment. MATERIALS AND METHODS: Patients requiring teeth replacement with dental implants for partially and fully edentulous cases in the maxilla and mandible were included. The provisional FDP was fabricated with hex castable copings and PEEK granules using the lost wax technique. The common path of insertion was established by reducing the coping that is in obstruction to the healing abutment. Retention was provided by the reciprocated guide surfaces of multiple hexagonal-shaped healing abutments. RESULTS: Twenty-three custom provisional PEEK FDPs supported by 166 implants in 20 partially and fully edentulous patients were provided during the treatment period. The mean functional periods of the provisional PEEK FDPs for maxillary and mandibular cases were 6.95 ± 0.84 months and 1.90 ± 0.62 months, respectively. All provisional PEEK FDPs functioned as intended for the entire treatment period. There were a total of 10 complications: 4 cases had resin and denture veneers debond from the PEEK framework; 3 partially edentulous cases required supplementary screw retention; and 3 implants in separate cases did not osseointegrate, requiring extended use of the provisional prosthesis. Two provisional mandibular PEEK FDPs with prolonged usage (over 2 years) were excluded from calculations. No fracture of the PEEK framework was observed. CONCLUSION: The results from this study suggest that PEEK can be a suitable material for use in provisional FDPs during dental implant treatment. Prosthetic complications were frequent but were resolved intraorally. The reciprocated guide surfaces of multiple hexagonal-shaped healing abutments can provide adequate retention and resistance for edentulous cases during the implant treatment period. However, in partially edentulous cases, a prosthesis without cross-arch stabilization supplementary screw retention was required.


Asunto(s)
Implantes Dentales , Pilares Dentales , Diseño de Prótesis Dental , Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental , Estudios de Seguimiento , Humanos , Cetonas , Polietilenglicoles
3.
Artículo en Inglés | MEDLINE | ID: mdl-34076642

RESUMEN

The aim of this retrospective study was to evaluate the long-term performance of the supercritical CO2 (Supercrit, BIOBank) viral-inactivated bone allografts in maxillary sinus augmentation. Thirty-four consecutive patients underwent 50 maxillary sinus augmentation procedures, and 103 implants were placed. At a mean of 8.8 years after graft surgery, 95 implants were well osseointegrated and functioning. Eight implants failed, and the overall implant survival rate at 10 years was 92.2%. The marginal bone loss averaged 1.2 ± 1.3 mm. Within the limitations of this study, the supercritical CO2 viral-inactivated bone allograft is a valuable bone graft material, achieving long-term satisfying outcomes when used alone.


Asunto(s)
Implantes Dentales , Elevación del Piso del Seno Maxilar , Trasplante Óseo , Dióxido de Carbono , Implantación Dental Endoósea , Fracaso de la Restauración Dental , Humanos , Maxilar/cirugía , Seno Maxilar/diagnóstico por imagen , Seno Maxilar/cirugía , Estudios Retrospectivos
4.
Int J Periodontics Restorative Dent ; 41(3): e121-e128, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34076648

RESUMEN

The posterior maxilla has traditionally presented a challenge for successful placement of dental implants due to a combination of poor bone quality, ridge atrophy, and pneumatization of the sinus floor following tooth extraction. However, with the successful and predictable surgical outcomes reported in the literature, more clinicians and patients are choosing an implant-supported restoration in the edentulous posterior maxilla. Consequently, sinus elevation and augmentation have gained more popularity. Extensive research has been conducted on types of bone graft materials and implants, less-invasive techniques to perform sinus augmentation, and timing for implant placement for sinus grafting. Despite the predictability of the techniques and biomaterials employed in sinus grafting procedures, intra- and postoperative complications are common. Much of the current literature discusses the local risk factors related to sinus augmentation, with few studies focusing on the patient-related risk factors. The purpose of this review is to identify, evaluate, and discuss the possible management of patient-related risk factors to allow for more predictable maxillary sinus floor augmentation outcomes.


Asunto(s)
Aumento de la Cresta Alveolar , Implantes Dentales , Elevación del Piso del Seno Maxilar , Trasplante Óseo , Implantación Dental Endoósea , Fracaso de la Restauración Dental , Humanos , Maxilar/cirugía , Seno Maxilar/diagnóstico por imagen , Seno Maxilar/cirugía , Factores de Riesgo
5.
Georgian Med News ; (313): 51-56, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-34103430

RESUMEN

THE AIM OF THE STUDY: Development of a technique for transferring the parameters of a temporary removable prosthesis to a permanent prosthesis based on dental implants. Examination and complex treatment of 55 people with complete loss of teeth were carried out. In the I-study group of patients (n = 30), the treatment was carried out according to the developed prototyping method, in the control group II (n = 25), the patients were treated using the standard method: after the implants were opened, the central ratio of the jaws and the setting of the teeth were re-determined. The transfer of the parameters of the removable prosthesis to the temporary crowns was carried out using an individual tray made by 3D printing. One-jaw prosthetics were performed in 45 patients, and 10 patients received prosthetics on both jaws. In the study group, where prosthetics were performed according to the developed prototyping technique, the number of visits for the manufacture and subsequent corrections of temporary crowns was significantly less than in the control group, and the number of days of adaptation of the patient to temporary crowns also decreased. Treatment of patients with complete absence of teeth using the developed prototyping technique made it possible to increase the accuracy of the manufacture of temporary prostheses based on dental implants, made it possible to shorten the time of prosthetics, reduce the time of adaptation to the prosthesis and achieve high aesthetic results, which makes this technique promising.


Asunto(s)
Implantes Dentales , Coronas , Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental , Prótesis de Recubrimiento , Humanos , Resultado del Tratamiento
6.
Shanghai Kou Qiang Yi Xue ; 30(2): 214-218, 2021 Apr.
Artículo en Chino | MEDLINE | ID: mdl-34109366

RESUMEN

PURPOSE: To investigate the 5-year survival and complication rates of implants placed in grafted sinuses with different surgical approaches and analyze the causes for failure. METHODS: This study retrospectively observed the prognosis of patients who underwent maxillary sinus augmentation by means of lateral window technique(LWT) or transalveolar osteotomy technique (TOT) and simultaneously installed implants performed, in Hefei Stomatological Hospital. The primary predictor variables were surgical approaches, including LWT and TOT. The primary outcome measurement was the 5-year implant survival rate, complication rates and failure causes. Potential confounders included diabetes, age at surgery, gender, smoking habit, oral hygiene, tooth position, length and diameter of implants and type of prosthesis. Chi-square test and logistic regression analysis were performed with SPSS 21.0 software package. RESULTS: Fifty-nine patients (31 males and 28 females), installed with 93 implants, with a mean age of (61.3±10.1) years old, were enrolled. Over (5±1.2) years of follow-up, five implants failed, with a total survival rate of 94.6%. In detail, there were 3 failed implants in the LWT group and 2 failed implants in the TOT group, for a survival rate of 85.7% and 97.2%, respectively. Chi-square test showed that smoking habit (P=0.010), oral hygiene(P=0.037) as well as operative approach(P=0.040) were significantly associated with the final survival rates, multivariate logistic regression analysis displayed that smoking habit (OR=0.030, 95%CI: 0.002-0.493, P=0.014) was still associated with the finial survival rates. Surgical approach(P=0.025) was markedly related to causes for the failed implants. Of which, three (100%) failed implants in the LWT group was due to poor osseointegration and implant mobility 3 months after sinus augmentation, and 2(100%) in the TOT group was because of persistent peri-implantitis and loss of the graft or alveolar bone 4 years after sinus augmentation. Smoking habit was also significantly relevant to complication rates(P=0.014), and the occurrence incidence of controllable peri-implantitis in patient having a smoking habit was relatively higher, accounting for 6.8%(6/88), compared with patients without smoking habit. Significant relationship between surgical approaches and implant complications was not observed(P=0.051). CONCLUSIONS: Different surgical approaches for maxillary sinus augmentation do not significantly correlate with implant survival rates and implant complications. However, surgical approach is markedly related to the causes of failed implants. Smoking will lead to a decreased implant survival rate and controllable peri-implantitis.


Asunto(s)
Implantes Dentales , Elevación del Piso del Seno Maxilar , Anciano , Implantación Dental Endoósea , Fracaso de la Restauración Dental , Femenino , Estudios de Seguimiento , Humanos , Masculino , Maxilar/cirugía , Seno Maxilar/cirugía , Persona de Mediana Edad , Estudios Retrospectivos , Elevación del Piso del Seno Maxilar/efectos adversos , Resultado del Tratamiento
8.
Int J Esthet Dent ; 16(2): 144-167, 2021 May 10.
Artículo en Inglés | MEDLINE | ID: mdl-33969972

RESUMEN

AIM: To investigate whether: 1) in the adhesive era, a full-crown restoration in a molar tooth is more resistant compared with an overlay-type restoration; b) a posterior indirect adhesive restoration (PIAR) is similar to a sound tooth from a mechanical point of view. MATERIALS AND METHODS: Seventy extracted molars were divided into five groups (1. Butt Joint; 2. Full Bevel; 3. Shoulder; 4. Full Crown; 5. Sound Tooth (control); N = 14) and prepared with four different PIAR overlay design types (according to an adhesthetics classification). Seven expert dentists performed all the preparation and cementation phases with codified protocols. A CAD/CAM workflow was used to realize the 56 monolithic lithium disilicate restorations. The samples were tested with thermomechanical aging (margin quality data will be given in Part 2 of this article series), and the resistance to fracture was then tested and analyzed. RESULTS AND CONCLUSIONS: In terms of fracture resistance in a situation of overload and within the limitations of the present study, it is possible to conclude that the Full Bevel group showed higher fracture strength than all the other groups. All PIAR restorations performed equally or better than the natural control tooth in the Sound Tooth group. The Full Crown group did not perform better than partial overlay PIAR. The fracture types were limited to the crown in 50% or more of the samples; the rest involved the cervical part of the root. The preparation design that involved the root the least was the Full Crown group (14%).


Asunto(s)
Cementos Dentales , Porcelana Dental , Cementación , Diseño Asistido por Computadora , Coronas , Diseño de Prótesis Dental , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Humanos , Ensayo de Materiales , Diente Molar
9.
Compend Contin Educ Dent ; 42(4): 178-180, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33960802

RESUMEN

Abutment screw loosening (ASL) is a fairly common problem that adversely affects the longterm success of a dental implant restoration. Dental laboratory error can play a role in the etiology of ASL. This article presents three cases that demonstrate how laboratory errors in the fabrication of implant restorations and mismanagement of abutment surfaces can result in ASL. It describes a method for examination of the abutment surface.


Asunto(s)
Implantes Dentales , Fracaso de la Restauración Dental , Tornillos Óseos , Pilares Dentales , Diseño de Implante Dental-Pilar , Implantes Dentales/efectos adversos , Prótesis Dental de Soporte Implantado , Análisis del Estrés Dental , Laboratorios Odontológicos , Torque
10.
Compend Contin Educ Dent ; 42(5): 236-241, 2021 May.
Artículo en Inglés | MEDLINE | ID: mdl-33980022

RESUMEN

While various zirconia-based alternatives are available today for the restoration of teeth and implants in the esthetic zone, each treatment approach could result in different optical behavior. To clinically demonstrate these differences, this case report describes a rehabilitation in the esthetic zone using several options of teeth- and implant-supported restorations. Conventional veneered zirconia crowns, high-translucent monolithic zirconia crowns, and minimally veneered high-translucent zirconia crowns were proposed and assessed under different light sources before cementation. The patient and clinical team achieved consensus on the minimally veneered high-translucent zirconia crowns, which were then cemented and have performed well over both tooth and implant substrates.


Asunto(s)
Implantes Dentales , Coronas , Fracaso de la Restauración Dental , Estética Dental , Humanos , Circonio
11.
J Contemp Dent Pract ; 22(1): 93-100, 2021 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-34002717

RESUMEN

AIM: The present review aimed to summarize and evaluate the available literature regarding the survival rate and outcomes of dental implants in patients with Papillon-Lefèvre syndrome (PLS). MATERIALS AND METHODS: An extensive search of the literature was conducted on PubMed, Scopus and Web of Science databases for all data published from January 1996 till April 2020 using a combination of the following keywords: 'Papillon Lefévre Syndrome', 'prosthodontic rehabilitation' and 'dental implant' according to the PRISMA guidelines for the focused research question constructed using the PICO criteria. Clinical trials and observational studies on implant placement in PLS patients reported in English language were included in the study. RESULTS: A total of 10 studies (nine case reports and one case series) comprising 124 dental implants placed in 13 PLS patients were included. The follow-up period ranged from 4 months to 9 years. With regard to implant loading, 9 studies reported delayed loading, while one study did not provide any information regarding the nature of implant loading. The design of prosthodontic superstructure was either a removable or fixed prosthesis. Out of the 124 inserted implants, 20 (16%) were reported as failed. The overall survival rate was 84%. CONCLUSION: The limited available evidence suggests that the survival rate of dental implants in patients with PLS is lower than that among healthy individuals. Nevertheless, no strict contraindication for implant-supported prosthesis seems to be justified in this group of patients. Further longitudinal studies with adequate follow-up periods are highly warranted. CLINICAL SIGNIFICANCE: The prognosis of implant treatment for PLS patients has not yet been established. Dental practitioners should follow a careful approach in planning the dental implant treatment for this cohort of patients.


Asunto(s)
Implantes Dentales , Enfermedad de Papillon-Lefevre , Implantación Dental Endoósea , Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental , Odontólogos , Estudios de Seguimiento , Humanos , Rol Profesional , Tasa de Supervivencia
12.
J Contemp Dent Pract ; 22(1): 101-104, 2021 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-34002718

RESUMEN

AIM: This clinical technique report aimed to describe a composite resin repair technique performed in an implant-supported prosthesis. BACKGROUND: Veneering ceramic fracture or chipping is one of the most frequent clinical failures in dentistry. Therefore, the use of less time- and cost-consuming ceramic repair techniques is helpful in clinical practice. TECHNIQUE: Briefly, to treat the ceramic surface, the glaze was removed at the margins of the fracture area, then, air-abrasion and acid-etching were performed. To promote chemical adhesion, a silane coupling agent and adhesive system were applied over the ceramic surface, and the composite resin was applied by incremental technique. Finally, the polish was performed. CONCLUSION: In conclusion, the applied composite resin repair of feldspathic porcelain chipping in implant-supported prosthesis was a simple, easy, affordable, and minimally invasive treatment. CLINICAL SIGNIFICANCE: The causes of veneer materials failures in metal-ceramic crowns are considered a challenge for the dentist and a problem that displeases patients. Repairs are indicated to prevent cracks from spreading and to prevent the accumulation of biofilm on the damaged surface. Therefore, different repair protocols have been proposed to enhance the esthetic, functionality, and longevity of the implant-supported prosthesis. Additionally, the success of the clinical cases depends on the capability to identify ceramic failures and the ability to indicate/perform the correct repair protocol. Since the described repair technique of the fractured screw-retained implant-supported prosthesis was a simple, easy, affordable, and minimally invasive treatment, with excellent esthetic and masticatory results, it represents an interesting clinical option.


Asunto(s)
Implantes Dentales , Porcelana Dental , Tornillos Óseos , Coronas , Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental , Estética Dental , Humanos , Circonio
13.
Int J Comput Dent ; 24(1): 41-51, 2021 Feb 26.
Artículo en Inglés | MEDLINE | ID: mdl-34006062

RESUMEN

AIM: To evaluate the fracture resistance and failure pattern of endodontically treated teeth with post and cores made of different CAD/CAM materials in comparison with cast post and cores. MATERIALS AND METHODS: A total of 40 maxillary central incisors were divided into four groups. Post and cores were fabricated using the following materials: fiber-reinforced composite, high-density polymer, polymer-infiltrated ceramic network, and nonprecious metal alloy as a control group. Specimens were covered with lithium disilicate crowns and subjected to thermomechanical cyclic loading followed by fracture resistance testing until failure. One-way ANOVA followed by Bonferroni multiple comparison tests were used to determine significant differences between the four groups. The significance level was set at 0.05. 3D finite element analysis was then performed, and results were analyzed based on the von Mises stress distribution criteria and the maximum principal stress for the possible failure areas. RESULTS: No statistically significant differences were found in the fracture resistance between the four groups. In terms of unrestorable failures, no significant differences were found among the tested groups. CONCLUSION: The tested post and cores have comparable fracture resistance to that of metallic cast post and cores in the anterior region. CLINICAL SIGNIFICANCE: Post and cores made of CAD/CAM materials offer an acceptable alternative for the restoration of anterior teeth.


Asunto(s)
Técnica de Perno Muñón , Diente no Vital , Cerámica , Diseño Asistido por Computadora , Coronas , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Humanos , Incisivo , Ensayo de Materiales
14.
Int J Oral Implantol (Berl) ; 14(1): 67-76, 2021 Mar 16.
Artículo en Inglés | MEDLINE | ID: mdl-34006072

RESUMEN

PURPOSE: To compare immediate and delayed implant replacement at failed implant sites to evaluate the factors associated with early failure of second implants after replacement. MATERIALS AND METHODS: Data regarding early implant failure followed by replacement with another fixture in a private practice setting between 2003 and 2019 were analysed retrospectively. Early failure was defined as loss of the dental implant within 6 months of placement. The impact of patient-level (age, sex, diabetes, smoking history) and implant-level (timing of implant replacement, timing of prosthetic loading, bone grafting) variables on the early failure rate of second implants after replacement was evaluated. Due to the hierarchical structure of the data, a multivariate multilevel mixed-effects Poisson regression analysis was performed. RESULTS: A total of 109 patients (63 men and 46 women) diagnosed with early implant failure at 124 implant sites were included in the present study. Fifty-eight implants were immediately replaced at the time of removal of the failed implant (test group), whereas 66 were replaced after a healing period of 2 to 4 months (delayed approach; control group). A total of 15 implants failed after replacement in 11 patients during the first 6 months of follow-up. Of these, nine failures (15.25%) occurred in seven patients (13.21%) after immediate replacement, and six (9.09%) occurred in four patients (7.02%) who underwent delayed replacement. No statistically significant differences were detected between the two groups (P = 0.431). CONCLUSIONS: No significant differences in implant survival at sites of previous failure were found according to the timing of implant replacement.


Asunto(s)
Implantes Dentales de Diente Único , Implantes Dentales , Implantación Dental Endoósea , Implantes Dentales/efectos adversos , Fracaso de la Restauración Dental , Femenino , Humanos , Masculino , Estudios Retrospectivos , Resultado del Tratamiento
15.
Int J Oral Implantol (Berl) ; 14(1): 101-112, 2021 Mar 16.
Artículo en Inglés | MEDLINE | ID: mdl-34006075

RESUMEN

PURPOSE: To compare 100% deproteinised bovine bone matrix grafts (DBBM, test group) and 100% autogenous bone grafts (AB, control group) for lateral maxillary sinus floor elevation in a blinded, parallel-group, randomised clinical trial. MATERIALS AND METHODS: Patients with 1 to 3 mm of residual bone height were randomised for sinus floor elevation with DBBM or AB grafts and simultaneous implant placement. The outcome variables were implant failure, complications, subjective satisfaction and radiographic peri-implant bone level 7 years after loading. RESULTS: A total of 20 patients (27 implants) were randomised to the test group and 20 (32 implants) to the control group. Ten patients from the test group and seven from the control group dropped out. Two implant failures occurred in the test group, whereas none were observed in the control group (P = 0.178). One complication occurred in the test group and two were recorded in the control group (P = 1.000). The radiographic peri-implant crestal bone level was 2.5 ± 1.3 mm in the test group and 0.9 ± 0.9 mm in the control group. The difference was 1.6 mm, favouring the control group (95% confidence interval 0.7-2.6; P = 0.002). The difference in vertical bone height was -0.4 mm, favouring the control group (95% confidence interval -1.9-1.1; P = 0.590). The difference in satisfaction measured using a visual analogue scale 7 years after loading was 0.0 mm (95% confidence interval -1.0-0.0; P = 0.639). CONCLUSIONS: Differences between treatments were found for crestal bone level, favouring the control group. No differences were observed for the other variables evaluated.


Asunto(s)
Elevación del Piso del Seno Maxilar , Senos Transversos , Animales , Matriz Ósea , Bovinos , Implantación Dental Endoósea , Fracaso de la Restauración Dental , Humanos , Maxilar/diagnóstico por imagen
16.
Beijing Da Xue Xue Bao Yi Xue Ban ; 53(2): 402-405, 2021 Mar 01.
Artículo en Chino | MEDLINE | ID: mdl-33879918

RESUMEN

OBJECTIVE: To evaluate the effects of different edge compensation angles on the fracture strength of multilayer zirconia all-ceramic crowns and traditional uniform zirconia all-ceramic crowns. METHODS: The resin tooth preparation specimen of the mandibular first molar with a knife-edge was fabricated. A 3D digital model of the specimen was obtained by scanning it with a 3D dental model scanner. The 3D digital model was imported into computer aided design (CAD) software, and three 3D digital models of the full crown with the same surface shape are designed with the edge compensation angles of 30°, 45° and 60°, respectively. Then, the designed 3D digital model is imported into computer aided manufacturing (CAM) software. Three kinds of multilayer and homogeneous zirconia all-porcelain crowns with different edge compensation angles were fabricated, 10 each for a total of 60. The fracture load of each crown was measured under the electronic universal testing machine. RESULTS: Fracture load of multilayer and uniform zirconia all-ceramic crowns, (4 322.86±610.07) N and (5 914.12±596.80) N in the 30° group, (5 264.82±883.76) N and (5 220.83±563.38) N in the 45° group and (4 900.42±345.41) N and (5 050.22±560.24) N in the 60° group, respectively. The fracture load of multi-layer zirconia all-ceramic crowns in the 30° group was significantly lower than that of homogeneous zirconia all-ceramic crowns(P < 0.05); there was no statistical significance in 45° group and 60° group(P>0.05). In the multi-layer zirconia all-ceramic crowns: the fracture load of the 30° group was significantly lower than that of the 45° group (P < 0.05); there was no significant difference between the 30° group and the 60° group, the 45° group and the 60° group (P>0.05).In uniform zirconia full crown group: the 30° group was higher than the 45° group, the 30° group was higher than the 60° group (P < 0.05), and there was no significant difference between the 45° group and the 60° group (P>0.05). CONCLUSION: The fracture loads of three kinds of uniform and multilayer zirconia all ceramic crowns with different edge compensation angles can meet the clinical requirements. A smaller edge compensation angle is recommended when using traditional zirconia all-ceramic crowns, while 45° is recommended when using multi-layer zirconia all-ceramic crowns.


Asunto(s)
Cerámica , Resistencia Flexional , Diseño Asistido por Computadora , Coronas , Porcelana Dental , Diseño de Prótesis Dental , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Ensayo de Materiales , Circonio
17.
Artículo en Inglés | MEDLINE | ID: mdl-33819333

RESUMEN

This study aimed to rehabilitate shortened maxillary dental arch with splinted crowns by connecting ultra-short implants with longer ones. In the posterior maxilla of 11 patients, one 10-mm (n = 11) and one or two ultra-short 4-mm (n = 17) dental implants were inserted. The insertion torque was lower than 20 Ncm in 55% of the 10-mm implants and in 94% of the 4-mm implants (P > .05). Median (range) implant stability quotients at the time of insertion and after 6 months were 61 (14 to 72) and 68 (51 to 79), respectively, for 4-mm implants, and 66 (52 to 78) and 78 (60 to 83), respectively, for 10-mm implants (P < .05). One 4-mm implant failed to integrate. All patients were restored with splinted metal-ceramic crowns connecting 4- and 10-mm implants. Median (range) clinical crown/implant ratios of 4-mm and 10-mm implants were 2.79 (1 to 3.66) and 1.06 (0.85 to 1.46), respectively (P < .05). Six months after prosthetic rehabilitation, the median (range) crestal bone loss was 0.3 mm (-0.7 to 1.7 mm) for 4-mm implants and was 0.5 mm (-0.8 to 3.5 mm) for 10-mm implants (P > .05). Splinted crowns combining 4- and 10-mm implants may contribute to a better force distribution in the treatment with ultra-short implant-supported prosthesis in the posterior maxilla.


Asunto(s)
Implantes Dentales , Maxilar , Coronas , Implantación Dental Endoósea , Diseño de Prótesis Dental , Prótesis Dental de Soporte Implantado , Fracaso de la Restauración Dental , Humanos , Maxilar/diagnóstico por imagen , Maxilar/cirugía , Seno Maxilar/cirugía
19.
Oper Dent ; 46(1): 75-86, 2021 Jan 01.
Artículo en Inglés | MEDLINE | ID: mdl-33882135

RESUMEN

CLINICAL RELEVANCE: Post and core crowns and endocrowns perform similarly on fracture strength, but endocrowns have more repairable fractures.


Asunto(s)
Incisivo , Técnica de Perno Muñón , Coronas , Cementos Dentales , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Dentina
20.
Int J Prosthodont ; 34(2): 163-172, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33882563

RESUMEN

PURPOSE: To systematically evaluate and compare the clinical performance of lithium disilicate (LDS)- and zirconium dioxide (ZrO2)-based ceramic monolithic crowns in the posterior dentition. MATERIALS AND METHODS: Treatment was administered by two experienced general dental practitioners in two public dental health care clinics. Forty-four patients received 60 crowns randomized to be either LDS or ZrO2 and cemented with resin cement. Evaluations were performed after 3 years using California Dental Association criteria. RESULTS: The mean follow-up time was 40 months (range: 31 to 50). No crown fractured during the observation time, and no chip-off fractures occurred. The success rate for ZrO2 was 80%, and the survival rate was 93.3%. For LDS, the success rate was 89.7%, and the survival rate was 100%. Survival after 3 years for all crowns together was 96.6%, and success was 84.7%. There was no significant difference between the two materials. CONCLUSION: Crowns made of monolithic translucent ZrO2 and LDS show equal and promising clinical results from a short-term perspective. There seems to be a difference between how patients and professionals rate crowns concerning esthetics (color and shape), with patients rating the restorations more favorably.


Asunto(s)
Diseño de Prótesis Dental , Odontólogos , Diseño Asistido por Computadora , Coronas , Porcelana Dental , Fracaso de la Restauración Dental , Estudios de Seguimiento , Humanos , Rol Profesional , Estudios Prospectivos , Circonio
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