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1.
Maria Auxiliadora Pereira Reginaldo Batista dos Santos-Júnior Johnny Alexandre Tavares Alaíde Hermínia Oliveira Pollyana Caldeira Leal Wilton Mitsunari Takeshita Antônio Márcio Barbosa-Júnior Luiz Eduardo Braga Bertassoni André Luis Faria-e-Silva 《Journal of the American Dental Association (1939)》2017,148(6):369-376
Background
Clinicians often use calcium hydroxide liners during stepwise treatment of advanced caries. In this randomized clinical trial, the authors compared the short-term outcome of stepwise caries removal with and without use of a calcium hydroxide liner in conjunction with provisional resin-modified glass ionomer (RMGI) restorations.Methods
The authors included in the trial 98 patients aged 15 to 30 years who had a deep carious lesion in a posterior tooth. The authors measured the dentin thickness radiographically and recorded its color, consistency, and moisture, as well as the bacterial count of the lesions. After partial caries removal, the authors assigned patients randomly to have their caries provisionally restored using RMGI with (control group) or without (test group) a calcium hydroxide liner. The primary outcome measure was tooth vitality after 90 days. Secondary outcomes included changes in dentinal, radiographic, and microbiological characteristics of the lesions.Results
The authors found no statistically significant difference between the test and control groups in tooth vitality after 90 days. Irrespective of calcium hydroxide liner use, the authors observed darker, harder, drier, and less contaminated dentin after the provisional restorations, but dentin thickness remained unchanged.Conclusions
On the basis of this 3-month clinical trial’s results, the use of a calcium hydroxide liner during stepwise caries excavation and provisional restoration did not provide any additional benefit.Practical Implications
After 3 months, using a calcium hydroxide liner does not appear to offer any additional benefit when clinicians use RMGI provisional restorations during stepwise caries removal. Longer studies are needed to confirm these results. 相似文献2.
Krysta Sellers John M. Powers Sudarat Kiat-amnuay 《The Journal of prosthetic dentistry》2017,117(2):247-252
Statement of problem
The optimal retention of implant-supported ceramic crowns on zirconia abutments is a goal of prosthodontic treatment.Purpose
The purpose of this in vitro study was to evaluate the retentive strength of implant-supported IPS e.max CAD-CAM (e.max) crowns bonded to custom zirconia implant abutments with different cements.Material and methods
An optical scan of a zirconia custom abutment and a complete-coverage modified crown was designed using an intraoral E4D scanner. One hundred twenty lithium disilicate crowns (IPS e.max CAD) were cemented to 120 zirconia abutment replicas with 1 of 6 cements: Panavia 21 (P21), Multilink Hybrid Abutment (MHA), RelyX Unicem 2 (RXU), RelyX Luting Plus (RLP), Ketac Cem (KC), and Premier Implant (PI). The specimens were stored at 37°C in 100% humidity for 24 hours. Half of the specimens were thermocycled for 500 cycles. The retentive force was measured using a pull-out test with a universal testing machine. Mean retentive strengths (MRS) were calculated using 2-way ANOVA and the Tukey-Kramer test (α=.05).Results
The MRS (MPa) after 24-hour storage were P21 (3.1), MHA (2.5), RXU (2.5), RLP (1.3), KC (0.9), and PI (0.5). The MRS after thermocycling were MHA (2.5), P21 (2.2), RLP (1.8), KC (1.4), RXU (1.1), and PI (0.3). P21 had the highest MRS after 24-hour storage (P<.001), but after thermocycling MHA had the highest MRS (P<.001). RXU showed a significant decrease in MRS after thermocycling (P<.05). Cement residue was mostly retained on the zirconia abutments for P21, while for the other cements’ residue was retained on the lithium disilicate crowns.Conclusions
The cements tested presented a range of retentive strengths, providing the clinician with a choice of more or less retentive cements. MHA was the most retentive cement after thermocycling. Thermocycling significantly affected the retentive strengths of the P21 and RXU cements. 相似文献3.
Gary Goldstein Mark Andrawis Mijin Choi Jonathan Wiens Malvin N. Janal 《The Journal of prosthetic dentistry》2017,117(3):426-429
Statement of problem
The definition of centric relation (CR) has been both controversial and divisive, with little consensus.Purpose
The purpose of this study was to determine whether agreement can be reached on a definition for CR among the Fellows of the Academy of Prosthodontics, the organization that writes the Glossary of Prosthodontic Terms.Material and methods
A survey of the Fellows of the Academy of Prosthodontics was conducted at the organization’s annual business meeting.Results
Of the 83 eligible Fellows in attendance, 72 responded to the survey, a response rate of 86%. Of those, the 5 responders who did not indicate a preferred definition and the 2 that chose 2 definitions were censored, yielding an analyzable sample of 65 for the definitions. The most common definition received 19 votes, the next 16, and the third 13, with the other 6 definitions receiving from 2 to 5 votes. Some of the variability in definition depended on the era of training.Conclusions
Disagreement and confusion continues regarding the definition of centric relation. Some of this disagreement can be explained by training era. 相似文献4.
5.
Statement of problem
Reports on computer-engineered complete dentures (CECDs) continue to increase. Systematic reviews on clinical outcomes and applications associated with CECDs are lacking in the literature.Purpose
The purpose of this systematic review was to determine the clinical outcomes and applications of CECDs.Material and methods
Electronic searches of the English literature from January 1984 to May 2016 were performed in MEDLINE and Cochrane databases, with the results enriched by hand searches and citation mining to address 2 relevant population intervention comparison outcome (PICO) questions: What are the clinical outcomes associated with CECDs? Are there specific applications and significant advantages for CECDs?Results
A review of the selected articles on CECDs revealed significantly better retention and reduced clinical time for the milled CECDs compared with conventional complete dentures. An advantage associated with CECDs is the possibility of electronically archiving data using digital technology for rapid fabrication. Applications reported in the literature with CECDs were also identified.Conclusions
A positive trend was seen in the outcomes with CECDs, although patient selection might have also contributed to favorable outcomes. Significantly reduced clinical time, improved retention, and digital archiving were the main advantages associated with CECDs. 相似文献6.
Ronald E. Goldstein Wendy Auclair Clark 《Journal of the American Dental Association (1939)》2017,148(6):387-391
Background
Awake bruxism is a common clinical condition that often goes undetected, often leading to pain or damaged teeth and restorations.Methods
The authors searched electronic databases regarding the treatment and effects of awake bruxism compared with those of sleep bruxism. The authors used the search terms diurnal bruxism and oral parafunction. The authors combined information from relevant literature with clinical experience to establish a recommended protocol for diagnosis and treatment.Results
The authors found articles regarding the diagnosis and treatment of bruxism. The authors combined information from the articles with a review of clinical cases to establish a treatment protocol for awake bruxism.Conclusions
Literature and clinical experience indicate a lack of patient awareness and, thus, underreporting of awake bruxism. As a result, myriad dental consequences can occur from bruxism. The authors propose a need for increased awareness, for both patients and professionals, particularly of the number of conditions related to awake bruxism.Practical Implications
Clinicians should look for clinical signs and symptoms of awake bruxism and use minimally invasive treatment modalities. 相似文献7.
Bjørn Einar Dahl Hans Jacob Rønold Jon E. Dahl 《The Journal of prosthetic dentistry》2017,117(3):400-404
Statement of problem
Whether single crowns produced by computer-aided design and computer-aided manufacturing (CAD-CAM) have an internal fit comparable to crowns made by lost-wax metal casting technique is unknown.Purpose
The purpose of this in vitro study was to compare the internal fit of single crowns produced with the lost-wax and metal casting technique with that of single crowns produced with the CAD-CAM technique.Material and methods
The internal fit of 5 groups of single crowns produced with the CAD-CAM technique was compared with that of single crowns produced in cobalt-chromium with the conventional lost-wax and metal casting technique. Comparison was performed using the triple-scan protocol; scans of the master model, the crown on the master model, and the intaglio of the crown were superimposed and analyzed with computer software. The 5 groups were milled presintered zirconia, milled hot isostatic pressed zirconia, milled lithium disilicate, milled cobalt-chromium, and laser-sintered cobalt-chromium.Results
The cement space in both the mesiodistal and buccopalatal directions was statistically smaller (P<.05) for crowns made by the conventional lost-wax and metal casting technique compared with that of crowns produced by the CAD-CAM technique.Conclusions
Single crowns made using the conventional lost-wax and metal casting technique have better internal fit than crowns produced using the CAD-CAM technique. 相似文献8.
Gerardo Maupomé Juan F. Yepes Madison Galloway Qing Tang George J. Eckert Timothy Downey LaQuia Vinson 《Journal of the American Dental Association (1939)》2017,148(10):760-766
Background
The effectiveness of stainless steel crowns (SSCs) versus direct restorations when placed in primary mandibular molars (teeth nos. L and S) is uncertain. The authors evaluated effectiveness by gauging longevity of treatment.Methods
The authors obtained private dental insurance claims (2004-2016) from a national dental data warehouse. Paid insurance claims records (n = 1,323,489) included type of treating dentist, treatment placed, and patient age.Results
Dentist specialty, type of treatment, and patient age were significant in predicting failure after the first restoration. The authors found high survival rates for all treatments (> 90%) after 5 years; however, as soon as within 3 years after treatment, SCCs had approximately 6% better survival.Conclusions
Teeth nos. L and S first treated with SSCs lasted longer without new treatment compared with teeth first treated with direct restorations; the difference was small. Teeth treated by pediatric dentists had better survival rates.Practical Implications
Primary mandibular first molars initially treated with SSCs lasted longer without new treatment compared with direct restorations. Overall dental care costs of the former were considerably higher. 相似文献9.
Dental plan premiums in the Affordable Care Act marketplaces trended downward from 2014 through 2016
Background
Pediatric dental benefits must be offered in the health insurance marketplaces created under the Affordable Care Act. The authors analyzed trends over time in premiums and the number of dental insurers participating in the marketplaces.Methods
The authors collected dental benefit plan data from 35 states participating in the federally facilitated marketplaces in 2014, 2015, and 2016. For each county, they counted the number of issuers offering stand-alone dental plans (SADPs) and medical plans with embedded pediatric dental benefits. They also analyzed trends in premiums.Results
From 2014 through 2016, the number of issuers of stand-alone dental plans and medical plans with embedded pediatric dental benefits either did not change or increased in most counties. Average premiums for low–actuarial-value SADPs declined from 2014 through 2016.Conclusions
The increase in the number of issuers of stand-alone dental plans and medical plans with embedded dental benefits may be associated with lower premiums. However, more research is needed to determine if this is the case.Practical Implications
Affordable dental plans in the marketplaces could induce people with lower incomes to sign up for dental benefits. Newly insured people could have significant oral health needs and pent-up demand for dental care. 相似文献10.
Jason Clague Thomas R. Belin Vivek Shetty 《Journal of the American Dental Association (1939)》2017,148(6):377-386
Background
The authors clarified the causal mechanisms underlying the high prevalence of dental disease encountered in people who habitually use methamphetamine (meth).Methods
Using a stratified sampling approach, the authors conducted comprehensive oral examinations and psychosocial assessments for 571 study participants who used meth. Three calibrated dentists, who used National Health and Nutrition Examination Survey (NHANES) protocols, characterized the study participants’ dental disease. The authors also collected data related to study participants’ history of meth use and other attributes linked to dental disease.Results
Study participants who used meth manifested higher rates of xerostomia and caries experience compared with NHANES control participants. Participants who used meth had a higher level of daily consumption of sugary beverages compared with NHANES control participants. Smoking meth did not increase caries experience over other modes of intake. Dental hygiene was a significant determinant of dental health outcomes.Conclusions
Mode of intake and frequency of meth use have a minimal impact on dental health outcomes. Behaviors, such as sugary beverage consumption and poor oral hygiene, better explain dental health outcomes.Practical Implications
Having a better understanding of the causal mechanisms of “meth mouth” sets the stage for clinicians to provide more personalized interventions and management of dental disease in people who use meth. 相似文献11.
Naichuan Su Yunmao Liao Hai Zhang Li Yue Xiaowen Lu Jiefei Shen Hang Wang 《The Journal of prosthetic dentistry》2017,117(1):150-157
Statement of problem
Indirect composite resins (ICR) are promising alternatives as veneering materials for zirconia frameworks. The effects of core-to-dentin thickness ratio (C/Dtr) on the mechanical property of bilayered veneer ICR/yttria-tetragonal zirconia polycrystalline (Y-TZP) core disks have not been previously studied.Purpose
The purpose of this in vitro study was to assess the effects of C/Dtr on the biaxial flexural strength, reliability, and fracture mode of bilayered veneer ICR/ Y-TZP core disks.Material and methods
A total of 180 bilayered 0.6-mm-thick composite resin disks in core material and C/Dtr of 2:1, 1:1, and 1:2 were tested with either core material placed up or placed down for piston-on-3-ball biaxial flexural strength. The mean biaxial flexural strength, Weibull modulus, and fracture mode were measured to evaluate the variation trend of the biaxial flexural strength, reliability, and fracture mode of the bilayered disks with various C/Dtr. One-way analysis of variance (ANOVA) and chi-square tests were used to evaluate the variation tendency of fracture mode with the C/Dtr or material placed down during testing (α=.05). Light microscopy was used to identify the fracture mode.Results
The mean biaxial flexural strength and reliability improved with the increase in C/Dtr when specimens were tested with the core material either up and down, and depended on the materials that were placed down during testing. The rates of delamination, Hertzian cone cracks, subcritical radial cracks, and number of fracture fragments partially depended on the C/Dtr and the materials that were placed down during testing.Conclusion
The biaxial flexural strength, reliability, and fracture mode in bilayered structures of Y-TZP core and veneer ICR depend on both the C/Dtr and the material that was placed down during testing. 相似文献12.
Olavo B. de Oliveira-Neto Fabiano Timbó Barbosa Célio Fernando de Sousa-Rodrigues Fernando José C. de Lima 《The Journal of prosthetic dentistry》2017,117(5):601-605
Statement of problem
With the increased number of published systematic reviews and in view of their wide clinical applicability, these studies must be carefully assessed before professionals begin to use their recommendations in daily practice, and above all, the methodological quality of this study design must be considered. In implant dentistry, one topic that has been arousing particular interest is the immediate placement of dental implants into infected sites.Purpose
The purpose of this systematic review was to determine the methodological quality of systematic reviews that evaluated the immediate placement of dental implants into infected sites.Material and methods
A systematic search was performed by 2 independent reviewers of PubMed, LILACS, and ISI Web of Knowledge up to March 2016. All selected articles were published in the English language. Systematic reviews of original papers that assessed the immediate placement of dental implants into infected sites were eligible for the overview. Narrative reviews, randomized clinical trials, and case reports were excluded. Methodological quality assessment was performed using A Measurement Tool to Assess Systematic Reviews.Results
Of the 5 selected systematic reviews, 3 were low methodological quality and 2 were assessed as moderate. None were high methodological quality. The first systematic review of the topic was published in 2010, and the most recent, published in 2015, was the only one that performed meta-analysis.Conclusions
The systematic reviews that assessed the immediate placement of dental implants into infected sites were assessed as low or moderate methodological quality. The topic focus remains controversial because the implant survival rate, the main outcome considered for the implant placement prognosis, presents contradictory results. 相似文献13.
Dan Feng Haihuan Gong Jiahui Zhang Xiaowei Guo Min Yan Song Zhu 《The Journal of prosthetic dentistry》2017,117(1):171-177
Statement of problem
Denture base resin may be exposed to different conditions for long periods, resulting in the loss of monomer by exudation and a decrease in mechanical properties.Purpose
The purpose of this in vitro study was to evaluate monomer loss by exudation from denture base resins doped with antibacterial coatings and their mechanical properties after long-term water immersion.Material and methods
Four kinds of dental base resin materials were used as experimental materials. The specimens of each resin were divided into an experimental group (coated) and a control group (uncoated). Monomer exudation was tested at 7 and 28 days by gas chromatography after materials were immersed in distilled water or a solution of 75% alcohol/distilled water. Flexural strength and elastic modulus were tested with a universal testing machine after immersion for 2 and 180 days. The surface morphology was characterized with atomic force microscopy. The data were analyzed using 3-way ANOVA followed by the Tukey-Kramer honest significant difference test (α=.05).Results
In both of the immersion media, each of the 3 factors (materials, coating, and immersion time) significantly affected the monomer exudation (P<.05). In addition, the interaction between any 2 of those factors or among the 3 factors had a significant interaction effect on the monomer exudation of the denture base (P<.05). The mechanical properties of the tested materials were different, and the immersion time had a significant effect on the flexural properties (P<.05). For flexural strength, a significant interaction effect occurred among the 3 factors (material, coating, and immersion time) (P<.05). The coating has a significant effect on the elastic modulus of denture base resin (P<.05) and on the interaction between the material and immersion time (P<.05).Conclusions
The silver-loaded mesoporous silica antibacterial coating can effectively reduce monomer exudation and enhance the flexural properties of denture base resin after immersion. 相似文献14.
15.
Abdulaziz AlHelal Hamad S. AlRumaih Mathew T. Kattadiyil Nadim Z. Baba Charles J. Goodacre 《The Journal of prosthetic dentistry》2017,117(2):233-238
Statement of problem
Clinical studies comparing the retention values of milled denture bases with those of conventionally processed denture bases are lacking.Purpose
The purpose of this clinical study was to compare the retention values of conventional heat-polymerized denture bases with those of digitally milled maxillary denture bases.Material and methods
Twenty individuals with completely edentulous maxillary arches participated in this study. Definitive polyvinyl siloxane impressions were scanned (iSeries; Dental Wings), and the standard tessellation language files were sent to Global Dental Science for the fabrication of a computer-aided design and computer-aided manufacturing (CAD-CAM) milled denture base (group MB) (AvaDent). The impression was then poured to obtain a definitive cast that was used to fabricate a heat-polymerized acrylic resin denture base resin (group HB). A custom-designed testing device was used to measure denture retention (N). Each denture base was subjected to a vertical pulling force by using an advanced digital force gauge 3 times at 10-minute intervals. The average retention of the 2 fabrication methods was compared using repeated ANOVA (α=.05).Results
Significantly increased retention was observed for the milled denture bases compared with that of the conventional heat-polymerized denture bases (P<.001).Conclusions
The retention offered by milled complete denture bases from prepolymerized poly(methyl methacrylate) resin was significantly higher than that offered by conventional heat- polymerized denture bases. 相似文献16.
17.
Introduction
Human dental pulp stem cells (hDPSCs) are ideal candidates for regenerating damaged dental tissue. To examine the possibility that hDPSCs may be used to regenerate pulp, we tested their in vitro effects on acute allogeneic immune responses.Methods
A peripheral blood mononuclear cell (PBMC) proliferation assay and immunoglobulin (Ig) production assay were performed to evaluate the immunosuppressive properties of hDPSCs.Results
The mixed lymphocyte reaction was suppressed by incubation with hDPSCs. Transforming growth factor beta (TGF-β) was the major soluble factor responsible for inhibiting the allogeneic proliferation of PBMCs. The production of IgM and IgG by allogeneic activation of responder B lymphocytes was also completely abrogated by TGF-β released from hDPSCs via interferon gamma in response to activation of the responder T lymphocytes.Conclusions
hDPSCs inhibit acute allogeneic immune responses by their release of TGF-β as a result of allogeneic stimulation of T lymphocytes. This study provides an insight into the potential clinical use of hDPSCs for allogeneic transplantation. 相似文献18.
Nehal Solanki Balendra Pratap Singh Pooran Chand Ramashankar Siddharth Deeksha Arya Lakshya Kumar Suryakant Tripathi Hemant Jivanani Abhishek Dubey 《The Journal of prosthetic dentistry》2017,117(1):67-72
Statement of problem
The use of mandibular advancement devices (MADs) in the treatment of sleep bruxism is gaining widespread importance. However, the effects of MADs on sleep bruxism scores, sleep quality, and occlusal force are not clear.Purpose
The purpose of this clinical study was to analyze the effect of MADs on sleep bruxism scores, sleep quality, and occlusal force.Material and methods
This uncontrolled before and after study enrolled 30 participants with sleep bruxism. Outcomes assessed were sleep quality, sleep bruxism scores (sleep bruxism bursts and sleep bruxism episodes/hour), and occlusal force before and after 15 and 30 days of using a MAD. Sleep bruxism scores were assessed by ambulatory polysomnography and sleep quality by using the Pittsburgh sleep quality index (PSQI). Occlusal force was recorded by using a digital gnathodynamometer in the first molar region on both sides. Statistical analysis was done by 1-factor repeated measures ANOVA (α=.05).Results
Statistically significant reductions in sleep bruxism bursts/h, sleep bruxism episodes/h, and PSQI scores were found after 15 and 30 days of using a MAD (P<.001). Statistically significant reduction in occlusal force on both sides was found only after 15 days (P<.001) but not after 30 days of using a MAD (P=.292 on left side, and P=.575 on the right side).Conclusions
The study showed a short-term improvement in sleep bruxism scores, sleep quality, and reduction in occlusal force in sleep bruxism participants after using MADs. 相似文献19.
Antigoni Stylianou John O. Burgess Perng-Ru Liu Daniel A. Givan Nathaniel C. Lawson 《The Journal of prosthetic dentistry》2017,117(1):116-123
Statement of problem
The clinical challenge of adhering cement to intracanal dentin is transmitting light to the most apical parts of root canals to allow more efficient polymerization of the cement.Purpose
The purpose of this in vitro study was to compare the cement-polymerizing ability, microstructure, and radiopacity of a new fiber optic post (iLumi fiber optic Post) with a clinically successful fiber post (DT Light Post).Material and methods
Polymerizing ability was compared using a modified depth-of-polymerization protocol. A split aluminum mold with a 12-mm cylindrical hole (diameter=4.7 mm) was filled with light-polymerized resin cement (Variolink Esthetic LC). Each fiber post (n=12) was positioned and light-polymerized on the coronal end for 60 seconds with a light-emitting diode polymerization light. Unpolymerized resin was dissolved with an organic solvent, and the weight and length of the polymerized resin cement were measured. Scanning electron microscopy was used to examine vertical and horizontal cross-sections. The radiopacity values of both the posts and 5 additional reference posts were evaluated using an aluminum step wedge.Results
The weight and length of the polymerized resin cement were significantly greater (P<.05) with the fiber optic post, which scanning electron microscopy showed to have a higher density of parallel fibers. The iLumi post demonstrated greater radiopacity among the tested fiber posts and a titanium alloy post.Conclusions
The iLumi fiber optic posts have a unique structural fiber composition and excellent radiopacity and light-transmitting ability that produce more complete polymerization of the resin cement than the DT Light posts. 相似文献20.
Faye Mascarenhas Burak Yilmaz Edwin McGlumphy Nancy Clelland Jeremy Seidt 《The Journal of prosthetic dentistry》2017,117(6):749-754