Objective: To compare the cementation precision of self-ligating brackets between two indirect bonding materials: polyvinylsiloxane and thermal glue.

Methods: Split-mouth randomized clinical trial study, with 15 participants. The study will be divided into two groups, Group 1: Polyvinylsiloxane and Group 2: Thermal glue.

Patients from the self-ligation clinic who meet the inclusion criteria will be invited to participate and sign the informed consent. For the cementation of the brackets in each patient, the upper arch (right and left) will be divided from the second premolar on the right side to the second premolar on the left side, randomly assigned, to be cemented with a polyvinylsiloxane transfer tray and the other with thermal glue (materials selected for the study).

Inclusion Criteria:

• Permanent dentition with the presence of teeth 15-25 with
• Crowding in the upper arch according to Little's irregularity index,
• Teeth with healthy enamel (without hypoplasias, fluorosis, amelogenesis imperfecta),
• Fully erupted teeth

Exclusion Criteria:

• Absence of teeth selected for the study or that required premolar extractions before starting alignment and leveling
• Patients with rehabilitation such as crowns, veneers, fractured dentition, atypical morphology
• Teeth whose bracket loosens at the time of the procedure due to failure of the union
• Poor oral hygiene
• Patients with any significant displacement of the tooth that could prevent seating of the transfer tray
• Study models with bubbles.

A double-blind study will be carried out, where the patient and the operators who will record the results will be blinded. It is not possible to blind the clinician who performs the indirect bonding process. The processing of the registration of the linear measurements and the statistical advisor will be blinded, this will be done by means of codes for each group.