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1.
Stomatologiia (Mosk) ; 99(4): 43-46, 2020.
Artículo en Ruso | MEDLINE | ID: mdl-32692518

RESUMEN

The objective of the research was to determine odontological (odontometric and odontoscopic) and morpho-aesthetic variations of the upper central and lateral incisors in 14-year-old children residing in Udmurt Republic. 200 adolescent respondents (100 boys and 100 girls) were included in the study. We accessed morphological aspects of the permanent upper right and left central incisors (URCI and ULCI) in 14-year-old children born and permanently residing in conditionally ecologically favorable districts of the Udmurt Republic. Odontological variations of the permanent tooth crown shapes in early adolescent children (14-year-old) are shown; morphological, ethnic, age and gender, aesthetic features are determined. The determined odontoscopic and odontometric features of the permanent tooth crown shapes matter of scientific and practical terms and can be used to clarify ethnicity and possibly gender. The identified patterns can change and multiply the information-statistical interpretation of the ethnic and morpho-aesthetic features of the permanent teeth, and hence have an important impact when restoring damaged teeth crowns, which affect the permanent dentition smile harmony in 14-year-old adolescents born and permanently residing in the Udmurt Republic.


Asunto(s)
Dentición Permanente , Corona del Diente , Adolescente , Niño , Coronas , Femenino , Humanos , Incisivo , Masculino , Odontalgia
3.
Shanghai Kou Qiang Yi Xue ; 29(2): 183-186, 2020 Apr.
Artículo en Chino | MEDLINE | ID: mdl-32626883

RESUMEN

PURPOSE: To determine the age medians for crown and root length completion stages of permanent teeth (except for the third molars) and to study gender differences in crown and root length completion stages by radiographic examinations. METHODS: The development of permanent teeth (except for the third molars) was evaluated from 3304 panoramic radiographs of children aged between 3 and 18 years by Haavikko's method. Statistical analysis was performed using SPSS 25.0 software package. Age medians for crown and root length completion stages of permanent teeth were calculated. Gender differences were analyzed by Mann-Whitney U test. RESULTS: There were no significant gender differences in crown completion stages of central incisor and first molar, of which P values were 0.143 (for maxillary central incisor), 0.122 (for maxillary first molar), 0.191 (for mandibular central incisor) and 0.558 (for mandibular first molar), while girls were found to be ahead of boys for crown completion stages of other teeth. In maxilla, girls were found to be ahead of boys for root length completion stages except for lateral incisor, second premolar and second molar, of which P values were 0.057, 0.130 and 0.294; in mandible, except for second premolar and second molar, girls were observed to be ahead of boys for root length completion stages, of which P values were 0.428 and 0.057. CONCLUSIONS: It is concluded that girls are advanced than boys for crown and root length completion stages in most teeth. There is a similarity in gender differences for crown and root length completion stages between maxilla and mandible.


Asunto(s)
Dentición Permanente , Corona del Diente , Adolescente , Niño , Preescolar , Coronas , Femenino , Humanos , Masculino , Maxilar , Diente Molar , Radiografía Panorámica
4.
Int J Prosthodont ; 33(4): 373-379, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32639696

RESUMEN

PURPOSE: To evaluate the influence of the cervical crown contour on marginal bone loss and soft tissue health around platform-switched, posteriorly placed, two-piece implants. MATERIALS AND METHODS: A dataset from two previously conducted studies was used. Patients with single two-piece, platform-switched implants in between two natural teeth or adjacent to one natural tooth were included. Clinical parameters and standardized periapical radiographs from 1 month and 5 years after final crown placement were assessed. A new measurement method was developed to analyze geometric values of the cervical crown contour. Inter- and intraexaminer reliability were assessed. Emergence angles were measured at 1, 2, and 3 mm above the implant shoulder. Linear correlations between variables were determined by calculating Pearson correlation coefficients. RESULTS: A total of 64 patients with 67 posterior implants met the inclusion criteria. At 1, 2, and 3 mm above the implant shoulder, mean emergence angles at the mesial implant sites were 0.5 ± 2.8, 12.8 ± 12.8, and 18.0 ± 11.3 degrees, respectively. At the distal sites, the corresponding values were 2.8 ± 8.3, 16.2 ±16.6, and 18.7 ± 13.8 degrees, respectively. Mean marginal bone loss between 1 month and the 5-year evaluations was 0.14 ± 0.34 mm at the mesial aspect and 0.26 ± 0.47 at the distal aspect of implants. No correlation with peri-implant bone loss or soft tissue health could be found. No implants showed signs of peri-implantitis. CONCLUSION: The cervical crown contour at platform-switched, posteriorly placed, two-piece implants showed no correlation with peri-implant marginal bone loss or soft tissue health up to 5 years after implant placement.


Asunto(s)
Pérdida de Hueso Alveolar , Implantes Dentales de Diente Único , Implantes Dentales , Estudios Transversales , Coronas , Estudios de Seguimiento , Humanos , Reproducibilidad de los Resultados
5.
Int J Prosthodont ; 33(4): 410-417, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32639701

RESUMEN

PURPOSE: To evaluate the dimensional accuracy of impressions made using a new fast-setting polyether material. MATERIALS AND METHODS: A metallic reference model with two crown preparations, one inlay preparation, and three stainless steel precision balls was digitized to create a digital reference model. Sixteen one-step impressions were made for each of the four study groups, differing in impression material (regular-setting polyether [RSP] vs fast-setting polyether [FSP]) and technique (monophase vs dualphase), for a total of 64 specimens. Plaster casts fabricated from these impressions were digitized using 3D scans. Global accuracy was studied by evaluating distance and angle deviations between the replica and the reference model. Local accuracy was described in terms of trueness and precision of the aligned individual abutment tooth surfaces. RESULTS: For all impression materials and techniques, the local accuracy at the abutment tooth level was excellent. For surfaces prepared for crowns, mean trueness was < 10 µm, and mean precision < 12 µm. Inlay surfaces were associated with higher inaccuracies (mean trueness < 21 µm and mean precision < 37 µm). The greatest global inaccuracies were generally measured for the cross-arch span, with mean distance changes between -55 µm and -94 µm. For all aspects of studied accuracy, impressions with FSP were at least comparable to those fabricated with RSP. CONCLUSION: Within the limitations of this study, all tested polyether materials would allow for clinically acceptable impression making. The new fast-setting material could be an alternative to regular-setting polyether materials, especially for single crowns and small fixed partial dentures.


Asunto(s)
Técnica de Impresión Dental , Modelos Dentales , Coronas , Materiales de Impresión Dental , Incrustaciones
6.
Shanghai Kou Qiang Yi Xue ; 29(1): 36-39, 2020 Feb.
Artículo en Chino | MEDLINE | ID: mdl-32524118

RESUMEN

PURPOSE: To investigate the effect of ultrasonic scaling on micro-leakage of all-ceramic crowns. METHODS: 48 first premolars of the similar shape and size were collected and prepared by one attending doctor. Two groups were randomly divided (zirconia crown group and glass ceramic crown group, with 24 in each group), and each group was randomly divided into two subgroups (resin cement group and resin modified glass cement subgroup, n=6). After the crowns were bonded and solidified for 24 h, 3 samples were randomly selected from each subgroup for ultrasonic scaling for 60 s, and the other 3 samples were used as the negative control group. After all samples were soaked in 5% fuchsin solution at room temperature for 48 h, buccal and lingual incisions were made, and double-blind scoring was performed for micro-leakage at the crown edge of each sample. SPSS 17.0 software package was used for statistical analysis. RESULTS: There were significant differences between the negative group and the ultrasonic group in micro-leakage of crowns which were cemented with resin modified glass cement(P<0.05), but there was no significant difference between the negative group and the ultrasonic group in micro-leakage of crowns which were cemented with resin cement(P>0.05). When the same adhesive was used, there was significant difference in microleakage between the zirconia crown and the glass-ceramic crown, whether ultrasonic supragingival scaling was performed or not(P<0.05). CONCLUSIONS: Ultrasonic scaling had significant effect on micro-leakage of crowns which were cemented with resin modified glass cement, and but had no significant effect on micro-leakage of crowns which were cemented with resin cement.


Asunto(s)
Filtración Dental , Cementación , Cerámica , Coronas , Cementos Dentales , Cementos de Ionómero Vitreo , Humanos , Ensayo de Materiales , Cementos de Resina , Ultrasonido
7.
Quintessence Int ; 51(7): 538-544, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32500861

RESUMEN

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


Asunto(s)
Diseño Asistido por Computadora , Diseño de Prótesis Dental , Cerámica , Coronas , Porcelana Dental , Odontólogos , Humanos , Impresión Tridimensional , Rol Profesional
8.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 38(3): 263-269, 2020 Jun 01.
Artículo en Chino | MEDLINE | ID: mdl-32573132

RESUMEN

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


Asunto(s)
Coronas , Diseño de Prótesis Dental , Diseño Asistido por Computadora , Porcelana Dental , Circonio
9.
Int J Comput Dent ; 23(2): 109-117, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32555764

RESUMEN

AIM: To evaluate width loss of the alveolar ridge three years after implant placement in a fresh extraction socket following two different tissue healing methodologies: conventional healing procedure vs CAD/CAM technology for a customized healing abutment. MATERIALS AND METHODS: Post-extraction sockets underwent immediate dental implant placement without the voids being filled between the implant surface and the socket wall. Samples (one implant per patient) were retrospectively enrolled in each group according to the type of healing procedure: implants in the conventional group underwent standard closed healing with a cover screw, while in the customized group the healing abutment was immediately screwed onto the head of the implant, mimicking the look of the extracted tooth fabricated by CAD/CAM technology. The width of the alveolar ridge was measured on 3D radiographs at baseline (before surgery) and three years postsurgery. Nonparametric statistics were performed with a significance level of 0.01. RESULTS: A total of 54 dental implants were selected. An implant survival rate of 100% was reported for all implants after 36 months. Three years after implant placement, loss in bone width was registered for both the conventional and customized groups, being 2.2 (1.1) and 0.2 (0.7) mm, respectively. Changes in the customized group were significantly lower than in the conventional group. Significant differences were again found between the groups for each of the tooth sites. Loss of bone width appeared negligible (from incisor to premolar), with values ranging between 0.2 and 0.4 mm in the customized group, whereas in the conventional group all tooth sites underwent wide shrinkage (with a bone loss ranging from 1.6 to 3.0 mm). CONCLUSION: The CAD/CAM procedure might provide the following advantages: 1) Stabilization of the gingival setting and bone volume in a fresh socket implant; 2) Maintaining the same emergence profile of teeth for restorative crowns, avoiding laboratory approximation of the emergence profile of the definitive restoration; and 3) Optimal prosthetic-surgical planning and minimally invasive extraction to preserve the integrity of the supporting tissue.


Asunto(s)
Implantes Dentales de Diente Único , Implantes Dentales , Carga Inmediata del Implante Dental , Coronas , Implantación Dental Endoósea , Estudios de Seguimiento , Humanos , Estudios Retrospectivos , Extracción Dental , Alveolo Dental/cirugía , Resultado del Tratamiento
10.
Artículo en Inglés | MEDLINE | ID: mdl-32559032

RESUMEN

Subgingival margins are often associated with adverse periodontal reactions, such as recession and gingival inflammation. The purpose of this cross-sectional dual-center study was to evaluate the periodontal health and stability of intrasulcular margins, comparing two prosthetic margin preparations: subgingival chamfer (SC) and subgingival feather-edge (SF) with gingival curettage. Ninety-six patients with 205 crowns (buccal margin 0.5 mm into the gingival sulcus) were included in the study. SF, gingival curettage, and intrasulcular restorative margin were prepared on 109 crowns; SC was prepared on 96. Restorations were in place for a mean of 55.9 months (range: 12 months to 10 years). No significant differences were found regarding probing depth between the two groups (mean buccal: 1.6 mm; mean interproximal: 2.3 mm). Significant increased recession was present around SCs, showing a higher margin-exposure frequency (buccal: 19.8% vs 3.7%; interproximal: 5.2% vs 1.4%). SC showed 8.5 times the risk of margin exposure compared to SF, men 5.5 times compared to women, and smokers 3.7 times compared to nonsmokers. Follow-up time was not a significant factor. SC sites showed a tendency for reduced buccal bleeding on probing compared to SF sites (3.0% vs 12.1%), but no significant difference was seen in a regression model. Plaque presence increased the risk of bleeding (4.1×), and women presented a higher risk of bleeding than men (3×). Subgingival margins can provide adequate periodontal health and stability if restorative procedures are well controlled and if patients are enrolled in an adequate maintenance program. SF with intrasulcular margin favors facial soft tissue stability, as reduced gingival recession was observed. The technique should be carefully applied to promote an adequate periodontal response.


Asunto(s)
Coronas , Recesión Gingival , Cerámica , Estudios Transversales , Femenino , Humanos , Masculino , Índice Periodontal
11.
J Oral Sci ; 62(3): 245-249, 2020 Jun 23.
Artículo en Inglés | MEDLINE | ID: mdl-32522913

RESUMEN

A systematic review was conducted to identify the biological responses, allergic reaction, hypersensitivity, toxicity, and ion release profile associated with pediatric stainless steel crowns (SSCs) in the existing literature. A systematic search was undertaken according to the Preferred Reporting Items for Systematic Reviews and Meta-analyses guidelines. The inclusion criteria consisted of patients younger than 20 years of age with SSC placement on primary or permanent teeth and in vivo and in vitro exposure to SSCs. Outcomes measures included adverse oral/mucosal effects; removal/failure/replacement of the SSC; type of allergic reaction; nickel (Ni) or other ion levels in bodily fluids, cellular, genotoxic, cytotoxic, mutagenic or carcinogenic effects related to the SSC. After an initial search of 764 studies in the database, 17 articles were included in the analysis. Evidence of allergic reactions to SSCs in children is limited and obtained from mostly low-quality research. Some studies showed that the amount of Ni detected was less than the amount ingested in the daily diet. In contrast, other studies reported a significantly higher release of Ni occurred into the saliva in acidic environments. There is some concern about the leaching of metal ions such as Ni from SSCs in children at high risk for caries. Further long-term studies are required to investigate this phenomenon.


Asunto(s)
Coronas , Caries Dental , Adulto , Niño , Dentición Permanente , Humanos , Níquel , Acero Inoxidable , Diente Primario , Adulto Joven
12.
J Evid Based Dent Pract ; 20(2): 101415, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32473801

RESUMEN

ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Effect of cement type on the clinical performance and complications of zirconia and lithium disilicate tooth-supported crowns: A systematic review. Report of the Committee on Research in Fixed Prosthodontics of the American Academy of Fixed Prosthodontics. Maroulakos G, Thompson GA, Kontogiorgos ED. J Prosthet Dent 2019;121:754-65. SOURCE OF FUNDING: Unknown. TYPE OF STUDY/DESIGN: Systematic review.


Asunto(s)
Coronas , Cementos Dentales , Porcelana Dental , Diseño de Prótesis Dental , Humanos , Prostodoncia , Estados Unidos , Circonio
13.
Pediatr Dent ; 42(3): 187-192, 2020 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-32522320

RESUMEN

Purposes: The purposes of this prospective trial were to: (1) compare the clinical and radiographic outcomes of three restorative methods -modified atraumatic restorative treatment (mART), the Hall technique (HT), and stainless steel crown (SSC)-in primary molars with multi-surface carious lesions; and (2) assess child behavior throughout these treatments. Methods: In this randomized controlled trial (RCT), 123 primary molars in four- to nine-year-old children were randomly divided into treatment groups (HT, mART, and SSC). Variables, including signs of failure, treatment time, child's discomfort, child's behavior, and canine overbite relationship in HT, were recorded immediately after the treatment and at six- and 12-month recalls. Results: Failures occurred most significantly for mART at all recalls (P=0.001). The treatment time was significantly higher in SSC. There was no significant difference in the child-assessment of discomfort (P=0.814). The child's behavior, as evaluated by the dentist, however, was significantly better for the SSC group. Alterations to the canine overbite relationship of HT decreased significantly during recalls (P<0.001). Conclusions: The high success and shorter treatment time of the Hall technique support its consideration as an alternative to the conventional technique for the treatment of carious primary teeth with multisurface lesions. The results for modified atraumatic restorative treatment were not as satisfying.


Asunto(s)
Coronas , Caries Dental , Acero Inoxidable , Niño , Preescolar , Fracaso de la Restauración Dental , Restauración Dental Permanente , Humanos , Diente Molar , Diente Primario , Resultado del Tratamiento
14.
Pediatr Dent ; 42(3): 208-211, 2020 May 15.
Artículo en Inglés | MEDLINE | ID: mdl-32522324

RESUMEN

Purpose: The preferred epidemiological caries assessment method is the decayed, missing, and filled surfaces (dmfs) score, which records all crowned/missing primary teeth's surfaces as carious. The purpose of this study was to evaluate the dmfs score's accuracy in capturing caries-affected (versus treated) surfaces of crowned/extracted teeth. Methods: A high-caries risk cohort of children, eight to 18 months old at baseline, were recruited from a nonfluoridated, rural, minority, and low-income community. Oral examinations occurred every 12 months for five years, identifying children with at least one caries-related crown/extraction (N equals 45). Observed scoring counted all crowned/extracted surfaces as carious. Private dentists' clinical records were also reviewed to determine how many surfaces were carious at crown/extraction appointments (53 actual scores for n equals 19). Differences in actual and observed scoring were evaluated (sign test; α equals 0.05 with two-tailed P-values). Results: Most children in the study group had more than one crown/extraction. Actual scoring revealed two to three fewer carious surfaces per tooth than observed scoring; cumulatively, observed scoring added two to 27 more surface counts per participant (P<0.001). Conclusions: Observed scoring exaggerated early childhood caries burdens when crowns/extractions were prevalent. Modified dmfs scoring, individualized or population-corrected crown/extraction counts, could more accurately estimate disease.


Asunto(s)
Caries Dental , Pérdida de Diente , Niño , Preescolar , Coronas , Índice CPO , Humanos , Lactante , Prevalencia , Extracción Dental
15.
J Contemp Dent Pract ; 21(4): 383-389, 2020 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-32584273

RESUMEN

AIM: This study aimed to investigate the influence of using dual-cure composite core materials for fiber post luting on the fracture resistance of endodontically treated maxillary central incisors. MATERIALS AND METHODS: Fifty sound and recently extracted maxillary central incisors were endodontically treated and distributed into five groups. In the control group, access cavities were restored with the composite resin. Experimental groups had the coronal structure trimmed 2 mm above the cementoenamel junction. Teeth were restored with fiber posts and different combinations of luting and core materials: RelyX Unicem for post luting and MultiCore for core buildup; MultiCore for post luting and core buildup; RelyX Unicem for post luting and LuxaCore for core buildup; or LuxaCore for post luting and core buildup. All teeth were restored with zirconium crowns and subjected to thermocycling (6000 cycles 5/55°C). Loading of the teeth was applied at 135° to the palatal surface, using a universal testing machine at a cross-speed of 0.5 mm/minute until failure. The mode of failure was analyzed under a digital microscope. RESULTS: The fracture resistance of the control group was significantly higher than the experimental groups (p < 0.05). There was no significant difference between the experimental groups (p > 0.05). All teeth demonstrated nonrestorable failures. CONCLUSION: With the presence of the ferrule effect and crown restoration, the selected materials for post luting and core buildup have no significant influence on the fracture resistance of the endodontically treated teeth. CLINICAL SIGNIFICANCE: The use of the same dual-cure composite core materials for fiber post luting and core buildup would simplify the clinical procedure without enhancement of the fracture resistance of the endodontically treated tooth.


Asunto(s)
Técnica de Perno Muñón , Fracturas de los Dientes , Diente no Vital , Resinas Compuestas , Coronas , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Humanos , Incisivo
16.
West Afr J Med ; 37(3): 253-259, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32476119

RESUMEN

BACKGROUND: Stainless steel crown (SSC) restoration is one of the restorative treatment options in the management of carious primary molars. The Hall technique is a biologic method of managing carious primary teeth by sealing in the caries with SSCs without the routine local anaesthesia and tooth preparations. The objectives of this study was to compare the treatment assessments of the conventional stainless steel crown restoration with Hall technique using subjects' discomfort during treatments and parents' treatment perception, treatment acceptability and satisfaction with the treatment. METHODS: The study was a comparative analytical study involving the placement of 25 SSC restorations using the conventional method and 25 SSC restorations using the Hall technique in 25 subjects aged 3-8 years with a pair or pairs of unrestored enamel or dentinal carious primary molars matched for tooth type, dental arch and extent of caries. Discomfort during the placements of the SSCs was assessed by the subjects while treatment perception, acceptability and satisfaction were assessed by the parents with the use of questionnaires. RESULTS: There was statistically significant difference (p-value 0.00001) between the conventional method and the Hall technique for the discomfort outcomes. There was no statistically significant difference for treatment perception (p=0.73), acceptability (0.72) and satisfaction (0.60). CONCLUSION: The Hall Technique compared favourably well with the conventional method in treatment perception, acceptability and satisfaction but it gave higher level of discomfort in some of the subjects. The Hall Technique appears to be a good method for managing dental caries in primary molar teeth especially in a resource challenged environment where electricity and access to care are contending issues.


Asunto(s)
Coronas , Atención Dental para Niños/métodos , Caries Dental/terapia , Restauración Dental Permanente/métodos , Cementos de Resina/uso terapéutico , Acero Inoxidable , Niño , Preescolar , Aleaciones Dentales , Humanos , Diente Molar/patología , Diente Primario/patología , Resultado del Tratamiento
18.
J Esthet Restor Dent ; 32(5): 472-479, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-32369271

RESUMEN

OBJECTIVES: The purpose of this in vitro study was to compare the effect of simulated endodontic access preparation on the failure loads of lithium disilicate crowns and resin-matrix ceramic (RMC) crowns. MATERIALS AND METHODS: Eighty maxillary first premolar crowns were manufactured by using four different CAD/CAM blocks (n = 20): lithium disilicate (LD; IPS e.max CAD), resin nanoceramic (RNC; Lava Ultimate), flexible nanaoceramic (FNC; GC Cerasmart), and polymer-infiltrated ceramic (PIC; VITA Enamic). Half of each group was accessed and repaired to simulate endodontic treatment. After cyclic loading, all specimens were loaded to failure. Data were analyzed with two-way ANOVA followed by Tukey-HSD test (α = .05). RESULTS: The load to failure results showed significant differences for material types (P < .001), but not for endodontic access simulation (P = .09). The highest and lowest mean failure loads were obtained for LD (1546 N) and PIC (843 N), respectively. CONCLUSION: The endodontic access preparation was not found to affect the fracture strength of LD and RMC crowns. The LD showed higher fracture strength than RMC crowns. Even though significant differences were noted for failure loads regarding different crown materials, all could reasonably withstand masticatory forces. CLINICAL SIGNIFICANCE: The endodontic access preparation through a restoration is known to be a common challenge in clinical practice. Maintaining a repaired LD or RMC crown is feasible and replacement may not be necessary.


Asunto(s)
Resistencia Flexional , Litio , Cerámica , Resinas Compuestas , Diseño Asistido por Computadora , Coronas , Porcelana Dental , Fracaso de la Restauración Dental , Análisis del Estrés Dental , Ensayo de Materiales
19.
J Prosthodont ; 29(6): 542-545, 2020 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-32394458

RESUMEN

Digital workflow expedites the procedure of retrofitting a surveyed crown against an existing removable partial denture (RPD). This article describes a simple and straightforward technique of digital workflow where an existing RPD is scanned as an antagonist to design the rest seat, guide plane, and height of contour of a surveyed crown.


Asunto(s)
Dentadura Parcial Removible , Diseño Asistido por Computadora , Coronas , Flujo de Trabajo
20.
J Evid Based Dent Pract ; 20(1): 101413, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-32381415

RESUMEN

ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Antagonist enamel wear of tooth-supported monolithic zirconia posterior crowns in vivo: A systematic review. Gou M, Chen H, Kang J, Wang H. J Prosthet Dent 2019;121:598-603. SOURCE OF FUNDING: This study was funded by the authors. TYPE OF STUDY/DESIGN: Systematic review and meta-analysis.


Asunto(s)
Alisadura de la Restauración Dental , Desgaste de los Dientes , Coronas , Esmalte Dental , Humanos , Circonio
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