PrimaDry vs PQ1: Choosing the Right Bonding Primer
By Ultradent Products, Inc. | Published: 2026-10-28
Category: Comparisons
Compare Ultradent's PrimaDry drying agent and PQ1 bonding resin to decide which bonding primer fits your moisture-control and adhesive needs.
Quick Answer
For moisture control before sealants, choose PrimaDry; for a reliable bonding resin that cures with any light, choose PQ1. Both are essential, but they serve different stages of the bonding process.
Different Jobs, Different Timing
PrimaDry and PQ1 are not interchangeable. PrimaDry is a drying agent that volatilizes residual moisture before you place sealants or bonding agents. PQ1 is a single-resin bonding agent that creates the adhesive layer itself. You might use both in the same procedure, but each solves a distinct problem.
The key difference is timing: PrimaDry preps the tooth surface, while PQ1 bonds the restorative material. If you skip moisture control, your bonding resin may fail. If you skip the bonding resin, your restoration won't adhere. Understanding this sequence helps you choose which product to reach for and when.
Moisture Control: The Foundation of Bonding
A dry, clean field is critical for any adhesive procedure. Residual moisture can compromise the bond strength of sealants and bonding agents. PrimaDry addresses this by volatilizing that moisture, ensuring your sealants stay put.
If you work in a high-humidity environment or struggle with isolation, a drying agent like PrimaDry becomes a valuable step. It's not a substitute for proper isolation, but it adds a layer of security before you apply your bonding resin.
Bonding Resin: The Adhesive Layer
PQ1 is a single-resin bonding agent that is easy to use and cures with all lights. This means you don't need a specific curing light to achieve a reliable bond. Whether you're placing a sealant, composite, or other restoration, PQ1 provides a consistent adhesive foundation.
Its simplicity is a major advantage: fewer steps, less room for error, and compatibility with your existing curing equipment. If you want a straightforward bonding agent that works across your practice, PQ1 is a strong choice.
Trade-Offs at a Glance
- Moisture Control vs. Adhesion: PrimaDry handles moisture control; PQ1 handles adhesion. You may need both for a successful bond, but if you can only choose one, determine your primary failure point: wet surfaces or weak adhesion. Assess your most common bonding failure to prioritize which product to add first.
- Simplicity vs. Extra Step: PQ1 is a single-resin bonding agent that simplifies the adhesive process. PrimaDry adds an extra step but can improve outcomes in moisture-prone cases. Weigh the added time against the potential for better retention. If you often face isolation challenges, the extra step may be worth it.
- Curing Light Compatibility: PQ1 cures with all lights, so you don't need to worry about light-specific requirements. This is a clear advantage if you have multiple curing lights in your practice. Verify that your curing lights are compatible with your other bonding agents for consistency.
Product Facts
- PrimaDry™-Drying Agent: PrimaDry is a drying agent that volatilizes residual moisture to help sealants stay put. This ensures a dry bonding surface, which is essential for long-lasting sealant and adhesive performance.
PrimaDry™-Drying Agent - PQ1™-Single-Resin Bonding: PQ1 is a single-resin bonding agent that is easy to use and cures with all lights. This provides a reliable adhesive layer without requiring a specific curing light, simplifying your bonding workflow.
PQ1™-Single-Resin Bonding
Which Should You Choose?
Best for
- Dental professionals who need to control residual moisture before placing sealants or bonding agents
- Practices that want a simple, light-compatible bonding resin for everyday restorative work
Not for
- Clinicians seeking a single product that both dries and bonds (these are two separate steps)
- Procedures that do not require a separate bonding agent (e.g., some bulk-fill restoratives)
