The default list of filter categories in the left hand sidebar does not include all options. Click on the link labeled "Choose additional filters" to add categories to the list. Filters are available to focus your search results by article types, text availability, publication dates, species, languages, sex, subjects, journal categories, ages, and search fields.
Type of Article, Species, Sex, and Ages filters are based on terms added by indexers. When these filters are selected they remove very recent articles that have not yet been indexed. Always look at the most recent search results before adding these filters.
Activated Filters Display on Search Result Pages. Filters stay selected during the current search session until you change or clear them.
Do not use this filter for most dental searches. Dental research may be published in non-dental journals.
Use this filter to explore the dental implications of a disease or the dental application of a process used in other fields, and then do a search using words for the specfic implications or applications you discover.
For example, the Dental Journals filter can be helpful in an exploratory search to identify research about the dental implications of eating disorders.
Research Study Filters
Add options to the "Article types" list by clicking on the "More" link at the bottom and selecting ones you want to use.
Therapy, intervention, and prevention search results can be limited to articles reporting clinical research by selecting Cllinical Trial, Meta-Analysis, Randomized Control Trial or Systematic Reviews from the "Articles types" list.
Clinical Trial: "Work that is the report of a pre-planned clinical study of the safety, efficacy, or optimum dosage schedule of one or more diagnostic, therapeutic, or prophylactic drugs, devices, or techniques in humans."
Meta-Analysis: "Works consisting of studies using a quantitative method of combining the results of independent studies (usually drawn from the published literature) and synthesizing summaries and conclusions which may be used to evaluate therapeutic effectiveness, plan new studies, etc. It is often an overview of clinical trials."
Randomized Control Trial: "Work consisting of a clinical trial that involves at least one test treatment and one control treatment, concurrent enrollment and follow-up of the test- and control-treated groups, and in which the treatments to be administered are selected by a random process, such as the use of a random-numbers table."
Systematic Reviews--retrieves "citations identified as systematic reviews, meta-analyses, reviews of clinical trials, evidence-based medicine, consensus development conferences, guidelines, and citations to articles from journals specializing in review studies of value to clinicians." Systematic Review Filter Search Strategy
Other Research Article Type Filters
Comparative Study--"comparison of outcomes, results, responses, etc for different techniques, therapeutic approaches or other inputs."
Evaluation Studies--"studies determining the effectiveness or utility of processes, personnel, and equipment."
Research Support, ...--"organizational source for funding of research activity"