Correlation between dental enamel chemical composition and bracket debonding, comparing adhesive systems through a...

Area of Science:

• Dental Materials Science
• Orthodontic Research
• Biomaterials Analysis

Background:

• Enamel damage during bracket removal is a documented concern in orthodontics.
• Understanding the factors influencing enamel loss is crucial for improving debonding procedures.

Purpose of the Study:

• To compare the shear bond strength (SBS) and tooth enamel loss associated with four different orthodontic adhesive systems.
• To determine the calcium/phosphorus (Ca/P) ratio of the enamel after bracket removal and assess its correlation with enamel damage.

Main Methods:

• Twenty premolars were divided into four groups, each bonded with a different adhesive system (Transbond MIP, Transbond PLUS SEP, Enlight, Stylus).
• Shear bond strength was measured using a universal testing machine.
• Enamel loss was quantified using scanning electron microscopy (SEM) and AutoCAD.
• Enamel composition, specifically the Ca/P ratio, was analyzed using energy-dispersive X-ray spectroscopy (EDS).

Main Results:

• The overall average SBS was 7.94 ± 2.26 MPa.
• Ninety percent of samples exhibited no enamel loss; only 10% showed minor loss (0.34–0.80 mm²), primarily with Transbond PLUS SEP.
• No statistically significant differences were found in the Ca/P ratio among the groups (ranging from 1.59 to 1.64).

Conclusions:

• The Ca/P ratio of tooth enamel does not appear to be associated with enamel damage during bracket removal.
• While minor enamel loss can occur, it is not consistently linked to the Ca/P ratio or the specific adhesives tested in this study.
• Further research may explore other microstructural or chemical factors influencing enamel integrity during orthodontic debonding.