This 12-week, randomized, double-blind, parallel-group study was conducted at the State Key Laboratory of Oral Diseases, Sichuan University, Chengdu, China. The clinical study protocol and informed-consent forms were reviewed and approved by the institutional review board at the West China College of Stomatology at Sichuan University.~Prospective patients aged 18 to 70 years in good oral and general health were examined during the screening visit.Patients were included according to inclusion and exclusion criteria.~The study participants refrained from all oral hygiene procedures for at least 12 hours as well as from eating, drinking and smoking for 4 hours prior to the baseline examinations. Eligible patients were randomly assigned to receive a commercially available dentifrice containing 0.6% Ilicis Rotundae Cortex extract (experimental group) or a dentifrice without any active ingredient (control group). Random assignment to groups was performed externally by another dentist, using a computer-generated randomization sequence; all other study personnel were neither involved in the randomization process nor aware of treatment assignments in any outcome evaluation.~All dentifrices were supplied in their original packaging (the experimental and control dentifrices were identical in appearance [including size, color, and shape] and taste). The dentifrices were covered to mask their identity and provided with a unique code that was not decoded until the conclusion of the study. The test product was distributed in a separate area, and all other study personnel and study participants were blinded to treatment assignment.~Patients were provided with their assigned product and the same soft-bristled toothbrush for unsupervised brushing for 12 weeks. Patients were instructed to brush their teeth twice a day (in the morning and in the evening) for 1 minute, using enough toothpaste to cover the entire brush, and to refrain from any other oral hygiene procedures throughout the duration of the study. There were no restrictions regarding diet or smoking habits during the course of the study. Patients were requested to return to the clinic after 6 weeks and 12 weeks for follow-ups, having refrained from all oral hygiene procedures for at least 12 hours before, and from eating, drinking and smoking for 4 hours before, the scheduled visit.~Patients were evaluated at baseline, after 6 weeks, and after 12 weeks of use. At each point, patients received oral examinations of their hard and soft tissues, followed by an evaluation of gingivitis and dental plaque. Patients were asked whether they had the presence of adverse events such as any discomfort while brushing and alterations in taste. All examinations were performed by the same investigator throughout the study. However, after each examination, the gingivitis and plaque scores were kept by the facilitator, and the investigator did not have access to the scores of the patients.~Dental plaque examination: Supra-gingival plaque on the facial and lingual surfaces of each tooth was scored according to the Turesky modification of the Quigley-Hein Plaque Index.~Gingivitis examination: Gingivitis was scored according to the Löe-Silness Gingival Index.~Adverse Events: Clinical evaluations by an investigator at each scheduled visit included assessments of both oral hard and soft tissue. Patients were interviewed during these examinations for any adverse events or changes in their health status. All patients underwent their final clinical examination at the conclusion of the study.
The objective of the present study was to compare the anti-plaque and anti-gingivitis effects of a commercially available dentifrice containing 0.6% Ilicis Rotundae Cortex extract to those of a control dentifrice without any active ingredient in 12 weeks of home use.