تأثير تطبيق بارامترات مختلفة من ليزر الإريبيوم ياغ في كومبوزت الإلصاق التقويمي

الملخص EN

Background and Objective: Er: YAG laser is considered a promising tool for remnant composite removal following bracket debonding.

However, earlier studies utilizing Er: YAG laser were not based on logic evidence for selecting Er: YAG parameters, and thus the results were unsatisfying.

This research was conducted to set the standards for selecting Er: YAG laser parameters during bracket Debonding, and consequently obtaining the best outcomes and minimizing the negative ones.

Therefore, the objective in this work is to reach the best parameters of Er: YAG laser for orthodontic bracket debonding.

Materials and Methods: 45 identical molds of orthodontic composite comprised the sample investigated in this work.

The sample was divided into three groups, 15 molds for each group, 50 µs pulse duration group, 100 µs pulse duration group, 300 µs pulse duration group.

The range of energy is 100 mj to 300 mj.

All the composite specimens were exposed to Er: YAG laser for 20 seconds, with the same air and water cooling conditions.

Q-switched Er: YAG laser system (Light Walker ST-E), manufactured by Fotona Inc, was used in this work.

This laser is situated at the Higher Institute for Laser Research and Applications, Damascus University.

Crater dimensions on each composite mold were calculated with the aid of microscopic examination.

Statistical analysis tests included ANCOVA and Pearson correlation coefficient, with the P value of ≤ 0.05 .

Results: The results of this study revealed the super passing performance of 50µs Er:YAG laser pulse duration among the groups regarding the percentage of removed composite and the time required for composite removal.

The study also showed that the removed composite volume is directly proportional to the laser energy .

This would decrease the time for orthodontic removal after bracket debonding.

Conclusions: Under the conditions of this study, Er: YAG laser pulse duration of 50 µs may be the preferred method for effective orthodontic bracket debonding.