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Niek J.M. Opdam

Bio: Niek J.M. Opdam is an academic researcher from Radboud University Nijmegen. The author has contributed to research in topics: Medicine & Dentistry. The author has an hindex of 39, co-authored 110 publications receiving 5829 citations. Previous affiliations of Niek J.M. Opdam include Radboud University Nijmegen Medical Centre.


Papers
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Journal ArticleDOI
TL;DR: A long survival rate for posterior composite restorations can be expected provided that patient, operator and materials factors are taken into account when the restorATIONS are performed.

762 citations

Journal ArticleDOI
TL;DR: The regression analyses showed a significantly higher risk of failure for restorations in high-caries-risk individuals and those with a higher number of restored surfaces and main reasons for failure were caries and fracture.
Abstract: The aim of this meta-analysis, based on individual participant data from several studies, was to investigate the influence of patient-, materials-, and tooth-related variables on the survival of posterior resin composite restorations. Following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, we conducted a search resulting in 12 longitudinal studies of direct posterior resin composite restorations with at least 5 years' follow-up. Original datasets were still available, including placement/failure/censoring of restorations, restored surfaces, materials used, reasons for clinical failure, and caries-risk status. A database including all restorations was constructed, and a multivariate Cox regression method was used to analyze variables of interest [patient (age; gender; caries-risk status), jaw (upper; lower), number of restored surfaces, resin composite and adhesive materials, and use of glass-ionomer cement as base/liner (present or absent)]. The hazard ratios with respective 95% confidence intervals were determined, and annual failure rates were calculated for subgroups. Of all restorations, 2,816 (2,585 Class II and 231 Class I) were included in the analysis, of which 569 failed during the observation period. Main reasons for failure were caries and fracture. The regression analyses showed a significantly higher risk of failure for restorations in high-caries-risk individuals and those with a higher number of restored surfaces.

478 citations

Journal ArticleDOI
TL;DR: Comparing the longevity of three- and four-/five-surface amalgam and composite restorations relative to patients’ caries risk and survival in the combined population and in the low-risk group, amalgam showed better survival.
Abstract: Information about the long-term clinical survival of large amalgam and composite restorations is still lacking. This retrospective study compares the longevity of three- and four-/five-surface amalgam and composite restorations relative to patients' caries risk. Patient records from a general practice were used for data collection. We evaluated 1949 large class II restorations (1202 amalgam/747 composite). Dates of placement, replacement, and failure were recorded, and caries risk of patients was assessed. Survival was calculated from Kaplan-Meier statistics. After 12 years, 293 amalgam and 114 composite restorations had failed. Large composite restorations showed a higher survival in the combined population and in the low-risk group. For three-surface restorations in high-risk patients, amalgam showed better survival.

453 citations

Journal ArticleDOI
TL;DR: Cox-regression analysis resulted in a significant effect of the amount of restored surfaces on the survival of the restorations, and two dentists obtained comparable longevity for amalgam and composite resin restoration.

348 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the longevity of posterior restorations placed in a single general practice using two different composites in filler characteristics and material properties: P-50 APC (3M ESPE) with 70vol.% inorganic filler loading (midfilled) and Herculite XR (Kerr) with 55vol.%.

281 citations


Cited by
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Journal ArticleDOI
TL;DR: There is no one ideal material available to the clinician, but the commercial materials that comprise the current armamentarium are of high quality and when used appropriately, have proven to deliver excellent clinical outcomes of adequate longevity.

1,525 citations

Journal ArticleDOI
TL;DR: The aim of this article is to systematically review the ingredients commonly used in current dental adhesives as well as the properties of these ingredients.

1,218 citations

Journal ArticleDOI
TL;DR: A long survival rate for posterior composite restorations can be expected provided that patient, operator and materials factors are taken into account when the restorATIONS are performed.

762 citations

Journal ArticleDOI
01 Jun 1988-Chest

678 citations

Journal ArticleDOI
TL;DR: Researchers compare the properties of flowable and hybrid composites and conclude that flowable materials should be used with caution in high-stress applications for restorative dentistry.
Abstract: A plethora of new low-viscosity composite resin materials, or flowable composites, have been marketed during the last two years, but little has been published about them. The authors describe research in which they compared the properties--filler, depth or cure, flow, wear, compressive strength, diametral tensile strength, indented biaxial flexure strength and toughness--of flowable and hybrid composites. Mechanical property tests (ISO 4049, ISO/DIS 6872) of eight flowable composites and two hybrid composites were conducted. The flowable composite with the least flow was similar to traditional composites. Mechanical properties were generally about 60 to 90 percent of those of conventional composites. The authors conclude that flowable materials should be used with caution in high-stress applications for restorative dentistry.

535 citations