OBJECTIVE: To evaluate the effect of informed consent format on preoperative anxiety of patients. MATERIAL AND METHODS: We performed a prospective study (91 patients) undergoing lower third molar extraction. Patients were distributed into three groups. Informed consent for surgery was obtained through a written document, an oral interview or a video recording. Afterwards, patients were asked about their anxiety level and the effect the informed consent had had on it. RESULTS: Whereas the information conveyed both in oral and written formats relieved the patient to some extent (in a scale of -3 to +3) 0.97 +/- 1.21 and 0.29 +/- 0.97, respectively), the video recording increased patient's anxiety in a statistically significant way (in a scale of -3 to +3, -0.57 +/- 1.43). The difference obtained between the values obtained in oral and written information was not statistically significant. DISCUSSION: The most adequate format, according to our study, would be the oral format.
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