Background of study: In Orthodontics, welding is a technique for joining stainless steel strips to create bands for both fixed and removable appliances. The main disadvantage is that they are susceptible to corrosion under various oral cavity environments. Therefore, the major goals of this study was to evaluate the release of metal ions from spot welded/Laser welded orthodontic attachments when immersed in various mouthwashes and also to compare the corrosion resistance of spot-welded with laser welded orthodontic attachments.

Materials and Methods: The 72 samples used in this investigation were split into two groups according to the following methodology: 36 laser-welded attachments for Group I. 36 spot-welded attachments for Group II. Each welded group's samples were subsequently separated into four subgroups. Artificial saliva (AS) was used as a control group, in which the samples were submerged for 24 hours before being withdrawn, and each subgroup had 9 samples from its respective group. ICP-MS (Scientific's inductively coupled plasma mass spectrometry) was used to calculate the sample's metal ion release.

Results: The attachments that were laser-welded produced less ions than those that were spot-welded. Both the laser-welded and spot-welded attachments emitted Fe, Ni, and Cr ions, but when the releases were compared, it was discovered that the Fe and Ni ions releases were significantly higher than the Cr ions releases. Additionally, it was determined that CHX (Chlorhexidine) mouthwash should be used as it released metal ions the least compared to the other mouthwashes.

Conclusion: When immersed in various mouth washes, the results showed that the laser-welded attachments discharged less ions than the spot-welded attachments. Comparing CHX mouthwash to others, it was discovered that it released less ions.