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1.
Rev. Odontol. Araçatuba (Impr.) ; 42(2): 24-29, maio-ago. 2021. ilus
Artículo en Portugués | LILACS, BBO - Odontología | ID: biblio-1252903

RESUMEN

Na Odontologia, o tratamento adequado depende da condição clínica de cada paciente, do conhecimento do profissional e dos materiais empregados. As coroas com sistemas cerâmicos puros se apresentam como excelente alternativa restauradora, demonstrando potencial estético superior ao das coroas metalocerâmicas. Este presente estudo teve como objetivo, relatar um caso clínico onde se realizou uma reabilitação estética de dentes anteriores com coroas de cerâmica pura à base de dissilicato de lítio. O paciente apresentava falta de harmonia e estética entre os dentes anteriores 12,11,21 e 22, na qual foi planejado e executado a reabilitação com coroas E-max desses elementos, bem como a substituição das restaurações dos dentes inferiores anteriores, e também foi realizado a confecção de coroa E-max do dente 35. Concluímos que as reabilitações estéticas de dentes anteriores com coroas de sistemas cerâmicos puros à base de dissilicato de lítio se apresentam como uma excelente alternativa reabilitadora, na qual o tratamento multidisciplinar é um fator considerado essencial, possibilitando restabelecer a estética e a funcionalidade do sorriso do paciente, a fim de alcançar o êxito do tratamento reabilitador(AU)


In dentistry, the appropriate treatment depends on the clinical condition of each patient, the knowledge of the professional and the materials used. Crowns with pure ceramic systems are an excellent restorative alternative, demonstrating an aesthetic potential superior to that of metalloceramic crowns. This present study aimed to report a clinical case where an aesthetic rehabilitation of anterior teeth was performed with crowns of pure ceramic based on lithium disilicate. The patient had a lack of harmony and aesthetics between the anterior teeth 12,11,21 and 22, in which the rehabilitation with E-max crowns of these elements was planned and performed, as well as the replacement of the anterior lower teeth restorations, and was also made the E-max crown of tooth 35. We conclude that the aesthetic rehabilitation of anterior teeth with crowns of pure ceramic systems based on lithium disilicate is an excellent alternative for rehabilitation, in which multidisciplinary treatment is considered an essential factor, making it possible to restore the aesthetics and functionality of the patient's smile, in order to achieve the success of the rehabilitation treatment(AU)


Asunto(s)
Humanos , Masculino , Adulto , Cerámica , Coronas , Rehabilitación Bucal , Restauración Dental Permanente , Estética Dental , Incrustaciones
2.
Int J Oral Maxillofac Implants ; 36(3): 485-491, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34115062

RESUMEN

PURPOSE: To evaluate the factors that could influence the fracture resistance of implant-supported posterior monolithic zirconia crowns. MATERIALS AND METHODS: Sixty zirconia molar crowns with three different occlusal thicknesses of 0.5, 1.0, and 1.5 mm (20 samples per group) were prepared for implant abutments using a CAD/CAM system. In each group, 10 crowns were luted on the abutment with resin cement (Panavia F), and the other 10 crowns were luted with resin-modified glass-ionomer cement (Ketac Cem Plus). Dynamic loading (1.2 × 106 cycles; 70 N) and thermal cycling were applied to the samples using a chewing simulator before evaluating their fracture resistance with a universal testing machine and examining their fracture type using a stereomicroscope. One-way analysis of variance (ANOVA), the Duncan test, and two-way ANOVA were used for data evaluation (α = .05). RESULTS: The occlusal thickness (P < .001) and cement type (P < .01) affected the fracture load of the monolithic zirconia crowns. The highest fracture resistance was found in 1.5-mm-thick crowns luted with resin cement (4,212 ± 501 N), and the lowest fracture resistance was found in 0.5-mm and 1-mmthick crowns luted with resin-modified glass-ionomer cement (1,198 ± 116 N and 1,197 ± 66 N). A significant difference was not found in the mean maximum fracture load between the 1.5-mm-thick crowns cemented with resin cement and glass-ionomer resin cement. CONCLUSION: Both the occlusal thickness and cement type remarkably affected the fracture resistance of the crowns, but occlusal thickness was more significant. Implant-supported posterior zirconia crowns can withstand physiologic occlusal forces even with a thickness as low as 0.5 mm. Resin luting cement is recommended for implant-supported posterior zirconia crowns with reduced occlusal thickness.


Asunto(s)
Implantes Dentales , Porcelana Dental , Diseño Asistido por Computadora , Coronas , Diseño de Prótesis Dental , Análisis del Estrés Dental , Cementos de Ionómero Vitreo , Ensayo de Materiales , Cementos de Resina , Circonio
3.
Int J Oral Maxillofac Implants ; 36(3): 561-568, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34115072

RESUMEN

PURPOSE: To evaluate the clinical outcomes of unsplinted implant-supported single crowns placed in adolescents, ages 10 to 19 years, and followed up from 5 to 15 years. MATERIALS AND METHODS: This retrospective case series evaluated the outcomes of implant-supported single crowns placed in adolescents between June 2002 and January 2015. The patients were treated with locking-taper connection implants under a two-stage rehabilitation technique. The variables assessed included patient identification, age and reason for implant placement, implant dimensions, follow-up time, status at follow-up, and event description. To analyze peri-implant changes, bone crest level relative to the adjacent tooth was measured from periapical radiographs taken after implantation and the latest follow-up. A paired t test was performed to determine initial and follow-up differences, and data are shown as mean and 95% confidence interval. Cumulative Kaplan-Meier survival rates for implants and prostheses were calculated. RESULTS: Twenty-one adolescent patients with ages ranging from 14 to 19 years, mainly 16 to 18 years, received a total of 37 implant-supported single crowns more frequently placed in the anterior maxilla as a result of congenital aplasia and trauma. Mean changes in bone crests were 1.99 (± 0.4) mm at the day of crown insertion and 2.23 (± 0.4) mm at the latest follow-up (average: 10 years; P = .08). No implant was lost during the follow-up period, leading to 100% implant survival. A total of 34 surviving crowns and 3 crown failures at the time of the latest follow-up led to a cumulative survival rate of 70%. The most commonly observed event was loss of proximal contacts and infraocclusion, which were handled chairside by adding resin composite. CONCLUSION: Unsplinted implant-supported single crowns placed in adolescents showed high implant and prosthesis survival rates, with a mean bone crest level increase of approximately 0.23 mm relative to the adjacent teeth.


Asunto(s)
Pérdida de Hueso Alveolar , Implantes Dentales de Diente Único , Implantes Dentales , Adolescente , Adulto , Niño , Coronas , Implantación Dental Endoósea/efectos adversos , Implantes Dentales/efectos adversos , Diseño de Prótesis Dental , Prótesis Dental de Soporte Implantado , Estudios de Seguimiento , Humanos , Estudios Retrospectivos , Adulto Joven
4.
Niger J Clin Pract ; 24(6): 828-832, 2021 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-34121729

RESUMEN

Background: Temporary stage in crowns and bridgework plays an important role in the success and failure of the final restorations. Lack of marginal seal of the temporary restorations can lead to further complications. Recently, digital dentistry has been improved in terms of marginal integrity. Aims: The aim of this study was to evaluate and compare the marginal leakage between CAD/CAM and conventionally made Polymethyl methacrylate (PMMA) interim crowns cemented with different temporary luting cements. Materials and Methods: Sixty resin dies of a maxillary right first premolar were prepared according to the protocol of the tooth preparation for all-ceramic crown. Interim crowns were then fabricated and assigned to two main groups according to the fabrication technique (CAD/CAM technique and conventional technique). Furthermore, the samples were sub-grouped (n = 10) according to the type of the luting cements: Zinc oxide eugenol (RelyX temp E), Zinc oxide non-eugenol (RelyX temp NE), and Zinc polycarboxylate cement (pentron). The specimens were then subjected to thermocycling at 5°C and 55°CC for 30 sec and transfer time of 15 seconds for 1500 cycles. After that, the specimens were immersed in a 2% methylene blue solution for 24 hours. The cemented specimens were sectioned buccolingually and the amount of marginal leakage was evaluated under digital microscope at magnification 50x. The scores of dye penetration were recorded and analyzed using one-way ANOVA at P < 0.05 for all tests. Results: For the fabrication technique, CAD/CAM-made interim crowns had significantly better performance in terms of lower microleakage in comparison to conventionally built interim crowns (P < 0.001). Overall, Zinc Oxide non-eugenol also showed significantly least microleakage as a luting cement then Zinc Oxide Eugenol and the most microleakage was found with Zinc Polycarboxylate regardless of the fabrication method. Conclusion: Interim crowns fabricated by CAD-CAM system are better suited for temporization. Zinc-oxide non-eugenol cements showed the least amount of microleakage in both types of crown.


Asunto(s)
Diseño Asistido por Computadora , Coronas , Cementación , Cementos Dentales , Cementos de Ionómero Vitreo , Ensayo de Materiales , Cementos de Resina , Preparación del Diente
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.
Int J Comput Dent ; 24(2): 195-205, 2021 Jun 04.
Artículo en Inglés | MEDLINE | ID: mdl-34085504

RESUMEN

AIM: The aim of the present study was to compare the marginal gap of teeth restored with crowns using six different CAD/CAM materials with two different milling units. MATERIALS AND METHODS: Ten mandibular molar teeth were collected after surgical extractions and prepared with two different diamond-coated instruments to receive full veneer crowns. The teeth were optically scanned, designed in CAD/CAM software, and milled in two different milling units. The marginal gap was measured using an optical microscope at 200x magnification. The restricted maximum likelihood (REML) method was used to estimate unknown parameters, and the statistical calculation was performed using R software. RESULTS: The model used to answer the primary study question involved a significant (P < 0.001) instrument versus material interaction. No other interaction was statistically significant (P = 0.146). Finally, significant within-crown heteroscedasticity was found (P < 0.001) for the two different diamond-coated instruments and was taken into account in the model used. CONCLUSIONS: The marginal gaps achieved by the crowns across all groups were within a clinically acceptable range.


Asunto(s)
Adaptación Marginal Dental , Diseño de Prótesis Dental , Diseño Asistido por Computadora , Coronas , Porcelana Dental , Humanos , Diente Molar
7.
Wiad Lek ; 74(5): 1130-1133, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34090277

RESUMEN

OBJECTIVE: The aim: To study the odontoglific and odometometric parameters of molar crowns of the upper and lower jaws in males and females. PATIENTS AND METHODS: Materials and methods: To achieve the aim of the research was used odontoglyphic, odometometric and statistical methods of research. RESULTS: Results: We have found that male molars of the upper jaw are characterized by approximately the same ratio between the vestibular-palatal and mesial-distal diameters of the crown, so the teeth are square-formed. For female large angular teeth of the upper jaw the predominance of vestibular-palatal over mesial-distal diameters of the crown is characteristic, which results in an oval form of the teeth. On having analyzed the forms of the third lower molars, it can be affirmed that for this group of teeth various variational forms of crowns, from three- to five-tuber forms, are characteristic. Vestibular-lingual and mesio-distal sizes also vary according to the type of odontoglific pattern of occlusal crown surface. CONCLUSION: Conclusions: We consider it expedient to take into account the abovementioned characteristics of the masticatory surface of molars of the upper and lower jaws of male and female persons for the creation of qualitative orthopedic structures that would fully restore the masticatory function.


Asunto(s)
Clínicas Odontológicas , Diente Molar , Coronas , Femenino , Humanos , Masculino , Mandíbula , Maxilar
8.
Shanghai Kou Qiang Yi Xue ; 30(2): 191-195, 2021 Apr.
Artículo en Chino | MEDLINE | ID: mdl-34109361

RESUMEN

PURPOSE: To investigate the clinical performance of chairside monolithic lithium disilicate glass-ceramics computer-aided design(CAD)-computer aided manufacturing(CAM) crowns, and to analyze the influencing factors of cumulative survival rate. METHODS: Two hundred and fourteen patients who had chairside posterior lithium disilicate glass-ceramic CAD-CAM crowns in Peking University Shenzhen Hospital from March 2015 to March 2017 were enrolled. The crown preparations were milled using Cerec Omnicam system. The clinical and esthetic effects of the crowns were analyzed at 3, 6, 12, 24, and 36 months. The cumulative survival rate of crowns was calculated, and the effects of gender, age, pulp condition, tooth position and adhesive type on the cumulative survival rate were analyzed. SPSS 20.0 software package was used for statistical analysis. RESULTS: After a 36-month follow-up, the failed crowns were mainly caused by marginal integrity, crown fracture and loss of retention. During the observation period of 3, 6, 12, 24 and 36 months, the scores of color, shape, quality of proximal contact, and chewing ability were greater than 9. The cumulative survival rates were 100.00%, 96.17%, 94.89%, 92.77% and 91.06% at 3, 6, 12, 24 and 36 months, respectively. The cumulative survival rate had no significant difference among different gender, age, and dental pulp status(P>0.05). CONCLUSIONS: Chairside monolithic lithium disilicate glass-ceramic CAD-CAM crowns have a high 3-year cumulative survival rate and good esthetic outcome, which is not affected by gender, age, and pulp status with high clinical value.


Asunto(s)
Diseño de Prótesis Dental , Estética Dental , Cerámica , Diseño Asistido por Computadora , Coronas , Porcelana Dental , Humanos , Ensayo de Materiales
9.
J Prosthet Dent ; 125(5): 804.e1-804.e6, 2021 May.
Artículo en Inglés | MEDLINE | ID: mdl-33934821

RESUMEN

STATEMENT OF PROBLEM: Agreement on the perfect virtual cement space value for computer-aided design and computer-aided manufacturing (CAD-CAM) implant-supported resin-ceramic crowns with the best marginal adaptation is lacking. The range of cement gap settings in some CAD design software programs is wide (0 to 200 µm), and manufacturer recommendations regarding the best cement gap setting for certain types of ceramics is not specific. PURPOSE: The purpose of this in vitro study was to evaluate the effect of virtual cement gap settings on the marginal fit of cemented resin-ceramic crowns on implant abutments. MATERIAL AND METHODS: Thirty implant analogs and matching stock abutments were coupled and implanted into autopolymerizing acrylic resin blocks. Three groups (n=10) of resin-ceramic molar crowns with 3 different virtual cement space settings (40, 60, and 100 µm) were designed by using a CAD design software program. The crowns were cemented over their corresponding abutments under a static load by using a specially designed cementing device. A scanning electron microscope was used to measure the mean vertical marginal gap (MG) for each group, where a total of 120 measurements for each of the 3 groups (12 sites per crown and 10 crowns per group) were evaluated. One-way analysis of variance and the post hoc Tukey pairwise comparison tests were used to analyze the data (α=.05). RESULTS: A significant difference (P<.001) was found between the MG values of the resin-ceramic implant-supported crowns fabricated by using the 3 cement space settings. The smallest MG was obtained with the 60-µm setting as compared with the 40-µm and 100-µm settings. CONCLUSIONS: A limited inverse relation was found between the MGs of CAD-CAM-fabricated resin-ceramic implant-supported crowns and the cement gap settings in the exocad software program. The smallest MGs were obtained when a 60-µm cement space value was used (P<.001).


Asunto(s)
Implantes Dentales , Adaptación Marginal Dental , Cerámica , Diseño Asistido por Computadora , Coronas , Porcelana Dental , Diseño de Prótesis Dental
10.
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
11.
Compend Contin Educ Dent ; 42(4): 158-162, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33960801

RESUMEN

Over time, patients treated in developmental stages of implantology may need additional treatment,as teeth adjacent to implants may fail and require replacement themselves with new implants. Blending newer implant rehabilitations into a dentition with existing implant-supported restorations can be challenging. The use of implants with a subcrestal angle correction (SAC) enables predictable screw-retained anchorage of temporary and definitive restorations. An SAC implant often can be placed into the palatal bone of an extraction socket, along the incisal angle of the crown, allowing screw retention of the prosthesis. This case report demonstrates the use of both straight and SAC implants combined with hard- and soft-tissue augmentation and serial provisionalization to replace hopeless teeth adjacent to pre-existing implants and improve esthetics in the anterior maxilla.


Asunto(s)
Implantes Dentales de Diente Único , Implantes Dentales , Coronas , Implantación Dental Endoósea , Prótesis Dental de Soporte Implantado , Estética Dental , Humanos , Maxilar/cirugía , Resultado del Tratamiento
12.
Compend Contin Educ Dent ; 42(4): 188-191, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33960804

RESUMEN

Enduring glass-ceramic restorations greatly depend on the quality of adhesion of the crown to enamel and dentin. Proper isolation is vital to the success of bonded ceramic restorations. The rubber dam has long been considered the primary method of preventing contamination of the operating field, a crucial requisite for adhesion. However, many dentists do not use rubber dam isolation due to its penchant for slowing down procedures. The authors present a case report that describes a technique for the indirect bonding of a ceramic restoration to a maxillary first molar using rubber dam isolation in conjunction with a floss ligature,a method that is aimed at optimizing operator effectiveness and efficiency.


Asunto(s)
Litio , Dique de Goma , Cerámica , Coronas , Esmalte Dental , Porcelana Dental , Humanos , Diente Molar , Cementos de Resina
13.
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
14.
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
15.
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
16.
BMC Oral Health ; 21(1): 214, 2021 04 27.
Artículo en Inglés | MEDLINE | ID: mdl-33906655

RESUMEN

BACKGROUND: The influence of different hypoglycemic agents on peri-implant variables among type 2 diabetes mellitus patients is still unclear. Therefore, the aim of this study was to assess the radiographic marginal bone loss and clinical parameters around implants in patients using different hypoglycemic agents. METHODS: In this retrospective cohort study, the dental implant records of type 2 diabetes mellitus patients who met the inclusion criteria were collected. The patients using only single medication as follows: insulin, metformin, or glucagon-like peptide-1 (GLP-1) drugs, were grouped according to their medication. These patients received implant placement with the same initial status, and all the prosthesis restorations were cement-retained ceramic crowns. The peri-implant marginal bone levels were evaluated by periapical radiographs immediately after implant placement and at 1 and 2-year follow-up visits. The baseline characteristics were compared among groups. The peri-implant radiographic marginal bone loss and clinical parameters were preliminarily compared using the Kruskal-Wallis test, and then the covariates were controlled by covariance analysis. Bonferroni post hoc adjustment test was performed for the multiple comparisons. RESULTS: After a review of more than 7000 medical records, a total of 150 patients with 308 implants at 1-year follow-up were assessed. The peri-implant marginal bone loss in the GLP-1 drug group was significantly smaller than the insulin group and metformin group (P < 0.01). The radiographic bone loss in the metformin group was higher than the insulin group (P < 0.05). Some of these included patients were lost to follow-up. Only 74 patients with 129 implants completed the 2-year follow-up. The radiographic bone loss in the metformin group was still higher than the insulin group (P < 0.05) and GLP-1 group (P < 0.01). There was no significant difference in the BOP (+) and the mean PD among groups (P > 0.05). CONCLUSIONS: The radiographic variables were not exactly the same among the patients with different hypoglycemic agents at both the 1 and 2-year follow-ups. After ensuring consistency in baseline characteristics, the positive effect of GLP-1 drugs on peri-implant bone remodeling may be no less than insulin or metformin. More studies are needed to verify the direct effect of these drugs on peri-implant bone. Clinical trial registration number ChiCTR2000034211 (retrospectively registered).


Asunto(s)
Pérdida de Hueso Alveolar , Implantes Dentales , Diabetes Mellitus Tipo 2 , Pérdida de Hueso Alveolar/diagnóstico por imagen , Pérdida de Hueso Alveolar/etiología , Coronas , Implantación Dental Endoósea , Prótesis Dental de Soporte Implantado , Diabetes Mellitus Tipo 2/tratamiento farmacológico , Estudios de Seguimiento , Humanos , Hipoglucemiantes/uso terapéutico , Estudios Retrospectivos , Resultado del Tratamiento
17.
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
18.
Int J Periodontics Restorative Dent ; 41(5146): 217-224, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33819326

RESUMEN

One of the chronic problems with traditional cement or screw retention of crowns to implants is the development of biologic and technical complications, including soft tissue complications, bone loss, screw loosening, loss of retention, and veneering material fractures. The purpose of this case series report is to document preliminary results, specifically crown retention, using a friction-fit connection of crown to abutment. A sample composed of patients who had one or more implants restored between July 1, 2019, and October 30, 2019, were enrolled in this retrospective case-control series. Each patient had their crown connected to the implant abutment using a friction-fit system. Patients were seen for routine follow-up for documentation of crown retention, and 24 crowns were followed. After 6 months of follow-up, 100% of the crowns retained retention and did not become loose under normal masticatory function. The use of a friction-fit connection provided excellent retention of the crown to the abutment over the 6-month follow-up period.


Asunto(s)
Coronas , Cementos Dentales , Tornillos Óseos , Pilares Dentales , Prótesis Dental de Soporte Implantado , Fricción , Humanos , Estudios Retrospectivos
19.
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
20.
Artículo en Inglés | MEDLINE | ID: mdl-33819335

RESUMEN

This study aimed to evaluate facial peri-implant tissue dimensions for implants connected to either convex or concave final abutments. Patients (n = 28) were randomly allocated to receive a single implant with an abutment of either convex (Group CX) or concave (Group CV) emergence shape. Twelve months after implant placement, CBCT scans were taken and reference points were identified: first visible bone-to-implant contact, implant shoulder (IS), bone crest (BC), and marginal mucosal level (MML). Mucosal thickness was evaluated at the level of IS (MT1), above the level of BC (MT2), and at the mid-distance of BC-MML (MT3). The mean total vertical peri-implant mucosa height was 3.26 ± 0.77 mm for Group CX and 3.70 ± 0.99 mm for Group CV (P = .23). The mean vertical peri-implant mucosa height below the bone crest was 0.62 ± 0.57 mm for Group CX and 1.26 ± 0.95 mm for Group CV (P = .04). Group CV had greater mean MT2 (4.09 ± 0.72 mm vs 3.36 ± 0.81 mm; P = .02) and MT3 (2.81 ± 0.66 mm vs 2.03 ± 0.60 mm; P = .005) compared to Group CX. Abutment macrodesign may have an effect on vertical and horizontal peri-implant tissue dimensions.


Asunto(s)
Pérdida de Hueso Alveolar , Implantes Dentales , Tomografía Computarizada de Haz Cónico Espiral , Coronas , Pilares Dentales , Implantación Dental Endoósea , Humanos , Membrana Mucosa
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