Quality of cluster randomized controlled trials in oral health: a systematic review of reports published between 2005 and 2009.

Objectives: To assess the quality of methods and reporting of recently published cluster randomized trials (CRTs) in oral health.

Methods: We searched PubMed for CRTs that included at least one oral health-related outcome and were published from 2005 to 2009 inclusive. We developed a list of criteria for assessing trial quality and reporting.