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IRCT20260502069240N1 IRCT 2026-05-10 Tehran University of Medical Sciences The effect of lemon and lavender aromatherapy on exam anxiety in dental students Evaluating the Effect of Aromatherapy on Anxiety Among Dental Students During Orthodontic Exam at TehranUniversity of Medical Sciences 2026-08-06 anticipated 86 Complete https://irct.ir/trial/89872 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Randomization description: Randomization will be performed at the individual level, and each eligible dental student will be considered as the unit of randomization. After assessment of eligibility criteria and obtaining written informed consent, participants will be allocated in a 1:1:1 ratio to three groups: lemon aromatherapy, lavender aromatherapy, and control group. Randomization will be performed using permuted blocks with variable block sizes of 3 and 6.Within each stratum, an independent randomization list will be generated by the statistical consultant using a random number table or statistical software, Blinding description: Due to the nature of the aromatherapy intervention, complete blinding of participants and intervention providers is not feasible, because lemon and lavender aromas are recognizable and the control group receives odorless water vapor. However, the statistician/data analyst will be blinded to group allocation. For this purpose, study groups will be coded in the dataset using non-identifiable labels such as A, B, and C, and statistical analysis will be performed without knowledge of the actual intervention assigned to each code. N/A Test-related situational anxiety in dental students. Intervention 1: Control group: Participants in this group will be exposed to odorless water vapor in the examination classroom. Fifteen minutes before students enter the classroom, an electric diffuser containing distilled water will be turned on, and vapor without essential oil will be dispersed in the classroom environment. After entering the classroom, students will remain exposed to the water vapor for 15 minutes. The diffuser will remain on until completion of outcome measurements. Intervention 2: Intervention group 1: Participants in this group will receive aromatherapy with lemon essential oil. Fifteen minutes before students enter the classroom, an electric diffuser containing water and 10 drops of pure lemon essential oil will be turned on, and the aroma will be dispersed in the classroom environment. After entering the classroom, students will remain exposed to the lemon aroma for 15 minutes. The diffuser will remain on until completion of outcome measurements. Intervention 3: Intervention group 2: Participants in this group will receive aromatherapy with lavender essential oil. Fifteen minutes before students enter the classroom, an electric diffuser containing water and 10 drops of pure lavender essential oil will be turned on, and the aroma will be dispersed in the classroom environment. After entering the classroom, students will remain exposed to the lavender aroma for 15 minutes. The diffuser will remain on until completion of outcome measurements. Yes - There is a plan to make this available What will be shared: All data can be shared after de-identifying the individuals participating in the study. When: Access period starts 6 years after results are published. To whom: The data is available for use in all professions. Conditions: The data can be used to conduct research and improve the general health of the community. Data and documentation will be provided to them if needed. Where to obtain: Contact Amir Hossein Lohrasbipour for data and documentation. Contact number: 0098 912 4427629 Email: amirlohi80@gmail.com How to obtain: By calling the contact information provided, the applicant can specify their request and the type of data and documents required, and then the documents will be provided to them within one to several weeks. Comments:
public Amirhossein Lohrasebi Poor
Unit 4, Block B, Yas Complex, No. 34, Next to Chaman Alley, Opposite Rahbar, Dr. Ali Mohammadi St., Mirzapour St., Shariati St.
Tehran Iran (Islamic Republic of) 1933665635 +98 21 2223 6974 amirlohi80@gmail.com Tehran University of Medical Sciences scientific Amirhossein Lohrasebi poor
Unit 4, Block B, Yas Complex, No. 34, Next to Chaman Alley, Opposite Rahbar, Dr. Ali Mohammadi St., Mirzapour St., Shariati St
Tehran Iran (Islamic Republic of) 1933665635 +98 21 2223 6974 amirlohi80@gmail.com Tehran University of Medical Sciences Iran (Islamic Republic of) The participant should be an undergraduate dental student. The participant should be taking or have taken the Practical Orthodontics 1 course. The participant should be a student at Tehran University of Medical Sciences. The participant should provide written informed consent to participate in the study. no limit no limit Both The participant has a common cold at the time of enrollment. The participant has asthma or other respiratory diseases. The participant has a known allergy to lemon or lavender essential oils. The participant uses medications that may affect anxiety or heart rate, such as beta-blockers, sedatives, or anxiolytic drugs. The participant has diseases that may affect anxiety or heart rate, such as anxiety disorders or cardiovascular diseases. F41.9 Anxiety disorder, unspecified Rehabilitation Rehabilitation Rehabilitation Control group: Participants in this group will be exposed to odorless water vapor in the examination classroom. Fifteen minutes before students enter the classroom, an electric diffuser containing distilled water will be turned on, and vapor without essential oil will be dispersed in the classroom environment. After entering the classroom, students will remain exposed to the water vapor for 15 minutes. The diffuser will remain on until completion of outcome measurements. Intervention group 1: Participants in this group will receive aromatherapy with lemon essential oil. Fifteen minutes before students enter the classroom, an electric diffuser containing water and 10 drops of pure lemon essential oil will be turned on, and the aroma will be dispersed in the classroom environment. After entering the classroom, students will remain exposed to the lemon aroma for 15 minutes. The diffuser will remain on until completion of outcome measurements. Intervention group 2: Participants in this group will receive aromatherapy with lavender essential oil. Fifteen minutes before students enter the classroom, an electric diffuser containing water and 10 drops of pure lavender essential oil will be turned on, and the aroma will be dispersed in the classroom environment. After entering the classroom, students will remain exposed to the lavender aroma for 15 minutes. The diffuser will remain on until completion of outcome measurements. State anxiety score of students measured by the state anxiety subscale of the STAI questionnaire. The score ranges from 20 to 80, and a higher score indicates higher state anxiety. Timepoint: At baseline, before students enter the classrooms.Fifteen minutes after entering the classroom and before the start of the exam, after exposure to lemon aroma, lavender aroma, or water vapor in the control group.Immediately after the end of the exam. Method of measurement: Spielberger State-Trait Anxiety Inventory, State Anxiety Subscale. Tehran University of Medical Sciences Approved 2026-02-16 Research Ethics Committee of the School of Dentistry, Tehran University of Medical Sciences, Tehran, End of North Kargar Street, next to the Atomic Energy Organization, before reaching the Hakim Shargh Highway exit, Faculty of Dentistry, Tehran University of Medical Sciences Tehran Tehran Iran (Islamic Republic of)