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Tensile Bond Strength of Auto-Polymerizing and Heat-Polymerizing Denture Reliners

Now online in the Journal of Prosthodontics, a research article co-authored by ACP members Amal Alfaraj BDS, MSD, Hesham Alouthah BDS, Chao-Chieh Yang DDS, MSD, and Wei-Shao Lin DDS, PhD, MBA.

Relining is a procedure used to resurface the intaglio of a removable dental prosthesis with a new base material and a successful relining procedure relies on the satisfactory bond strength between the relining material and the denture base.

The focus of this study was to compare the tensile bond strength (TBS) of auto-polymerizing and heat-polymerizing denture reliners on conventional (compression-molding and injection-molding) and computer-aided design and computer-aided manufacturing (milled and 3D-printed) denture base materials.

Eighty standard dogbone-shaped specimens were fabricated from four materials: compression-molding, injection-molding, milled, and 3D-printed denture base materials. A 3-mm cutoff was removed from each specimen at the midsection, and all specimens were reattached with either auto-polymerizing or heat-polymerizing reliner. The TBS was measured on a universal testing machine.

Compression-molding denture base material connected with a heat-polymerizing reliner showed the highest TBS, whereas 3D-printed denture base material connected with an auto-polymerizing reliner showed the lowest TBS.

When the auto-polymerizing reliner is used with 3D-printed denture base material, clinicians should be aware of lower TBS value and possible cohesive failures, and the detachment of the reliner from the denture base.

Alfaraj A, Chu T-MG, Alouthah H, Yang C-C, Lin W-S. Tensile bond strength of auto-polymerizing and heat-polymerizing denture reliners on the conventional and CAD–CAM denture base materials. J Prosthodont. 2023; 1– 9. https://doi.org/10.1111/jopr.13642

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