In terms of bond strength, how should self-etch one-step, self-etch two-step, and total-etch two-step be arranged?

Self-etch systems are designed to simplify the bonding process by incorporating acidic primers that ensure demineralization and infiltration of the bonding agent. The bond strength typically varies based on the type of etching system used.

In this arrangement, self-etch one-step systems are positioned as having the lowest bond strength. This is primarily due to the fact that these systems combine the etching and bonding steps into a single application, which can lead to a less effective interaction with the tooth structure since it does not allow for optimal acid exposure and subsequent bonding.

Self-etch two-step systems are placed in the middle of the arrangement because they consist of a separate etching step followed by a bonding step. This separation allows better control over the etching process and can improve bond strength compared to the one-step approach. The second step ensures that more effective bonding occurs, leading to greater strength.

Total-etch two-step systems are recognized for achieving the highest bond strength among these options. They employ a phosphoric acid etch that thoroughly demineralizes enamel and dentin, creating a very reactive surface for the bonding agent. This effective etching leads to a stronger micromechanical bond due to the increased surface area for adhesion.

Thus, when arranged according to bond