XP Bond Universal Total-Etch Adhesive?The Future of Bonding

Author : Dental Product Shopper
Published Date 01/31/2012
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XP Bond Universal Total-Etch Adhesive?The Future of Bonding

Can an adhesive achieve a balance of incorporating the advantages of successful past materials while eliminating their negative challenges? A solution is promising with DENTSPLY Caulk?s XP Bond, an etch-and- rinse adhesive.

XP Bond?s technique involves etching with phosphoric acid followed by rinsing. The bonus news: XP Bond does not show clinically reduced bond strength if dentin is either over-dried or not properly hydrated. Unlike some of the other totaletch adhesives, XP Bond can draw resin down the tubule while combining with the smear layer to form a hybrid layer. Bond strengths of 19 MPa and higher have been documented.

A Little Bonding History

Direct adhesion to tooth structure became a reality in the mid-1970s. Originally, adhesion was successfully accomplished by enamel bonding. This process was indispensable for free-hand bonding and veneering, where restorations could be created without tooth preparation. In the 1990s, the introduction of dentin bonding expanded the applications of adhesive dentistry.

Today, most discussions and research focus on dentin bonding, but the high success rates and longevity of enamelbonded restorations should not be ignored; enamel bonding is just as valuable and important as it has always been.

Enamel vs Dentin Basics

Enamel and dentin bonding techniques are familiar to most restorative dentists, but it is probably helpful to review a few basics.

The enamel bonding environment is ?clean and dry? while the dentin bonding environment is ?wet and dirty.? Bonding agents flow readily and efficiently into etched enamel?s narrow prisms. Dentinal tubules need additional mechanisms to attract bonding agents. Enamel bonding is not affected by over-etching, over-drying, or heat, but dentin bonding is techniquesensitive and prone to hypersensitivity or damage to odontoblasts. The average minimum bond strengths are 23 MPa for enamel bonding and 19 MPa for dentin bonding.

The Latest Generation

Total-etch systems have been the most popular dentin bonding systems for the past 15 years. The newer term?etch-andrinse? actually refers to that same bonding procedure. Original total-etch systems were comprised of separate bottles of primer and adhesive. Later systems combined primer and adhesive into a single bottle. The XP Bond total etch-and-rinse system incorporates some of the advantages of self-etch systems.

Strong and Predictable

Enamel bonding exhibits the most predictable and strongest bond to tooth surface. The original total-etch systems are dependable, with long-term data to support efficacy. Self-etch systems show the strongest bond to dentin, but may be somewhat suspect in their ability to bond enamel.

Using XP Bond streamlines the workflow in my practice and offers my patients reliable and comfortable outcomes. Incorporating bonded enamel remains the best bet for ensuring dependable, longlasting adhesive restorations.

Editor?s note: This article is excerpted from a comprehensive, detailed white paper by Dr. Goldfogel.

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