Shear bond strength of denture teeth to base: a comparative study

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Prosthodontics

Background:

• Fracture and debonding of artificial teeth from denture bases are frequent clinical complications.
• Ensuring the mechanical integrity of the tooth-denture base junction is crucial for denture longevity and function.

Purpose of the Study:

• To evaluate and compare the bond strength of a high-impact, heat-cured denture base material to three commercial brands of artificial denture teeth: Bioform, Dentacryl, and TNR.
• To determine the failure mode (adhesive vs. cohesive) at the tooth-denture base interface.

Main Methods:

• A shear or peeling load was applied to the junction between the denture teeth and the denture base.
• Ninety-three percent of tested specimens were analyzed for failure modes.
• Cohesive bond strength was assessed for Dentacryl, Bioform, and TNR denture teeth.

Main Results:

• The vast majority of failures (93%) occurred cohesively within the denture tooth material, not adhesively at the tooth-denture base junction.
• Dentacryl exhibited the highest cohesive bond strength among the tested brands.
• Bioform and TNR showed lower cohesive bond strengths compared to Dentacryl, with some teeth displaying brittle fracture and others distortion upon loading.

Conclusions:

• The bond between the tested denture teeth and the denture base is generally strong, with failure occurring within the tooth structure.
• Dentacryl demonstrates superior cohesive bond strength, suggesting greater resistance to fracture and improved durability in clinical applications.
• Material selection of denture teeth can significantly impact the mechanical performance and longevity of complete dentures.