Filler Loading
The proportion of inorganic filler particles incorporated into a resin-based dental material, typically expressed as a percentage by weight or volume.
Full Definition
Filler loading refers to the quantity and distribution of inorganic filler particles—such as silica, barium glass, or zirconia—within the resin matrix of composite or adhesive dental materials. Higher filler loading generally correlates with improved mechanical properties, reduced polymerisation shrinkage, and enhanced wear resistance. It is commonly reported as wt% (weight percent) or vol% (volume percent), and editors must ensure the method of measurement is specified, as the two values differ significantly. Filler loading is a key differentiator among composite categories (e.g., nanofill, microhybrid, bulk-fill). The term should not be used interchangeably with 'particle size,' which is a related but separate descriptor.
Usage
Usage note: Always clarify wt% vs vol% in copy; the two values for the same material can differ by 10–15 percentage points.
In Context
- "The bulk-fill composite achieved a filler loading of 82 wt%, contributing to its low shrinkage stress values." — Product technical datasheet
- "Editors should confirm whether filler loading figures are expressed by weight or volume, as authors frequently omit this distinction." — Manuscript review guidance