Assessing shade differences in acrylic resin denture and natural teeth

Area of Science:

• Dentistry
• Dental Materials Science
• Biomedical Engineering

Background:

• Accurate shade matching is crucial for the aesthetic success of acrylic resin denture teeth.
• Existing shade guides may present challenges for dentists in achieving optimal shade selection.
• Understanding natural tooth shade variation is essential for effective prosthetic restorations.

Purpose of the Study:

• To evaluate perceptual errors dentists make when using shade guides for acrylic resin denture teeth.
• To assess the shade variations in natural teeth based on demographic factors.
• To determine if a rearranged shade guide improves shade selection for complete dentures.

Main Methods:

• Two experiments assessed dentists' use of a manufacturer's shade guide, including order verification and tab discrimination.
• A third experiment analyzed natural tooth shades across different ages, genders, and complexions using a rearranged Biotone shade guide.
• A fourth experiment compared denture tooth shades with natural tooth shades.

Main Results:

• The numbered progression of shade tabs does not consistently follow a light-to-dark order, and dentists experience difficulty discriminating between some tabs.
• Natural teeth significantly darken with age, while denture tooth shade selection remains relatively constant.
• Rearranging the shade guide tabs based on empirical data can facilitate shade selection.

Conclusions:

• The current shade guide system for acrylic resin denture teeth requires revision due to ordering and discrimination issues.
• Age is a significant factor in natural tooth darkening, necessitating consideration during prosthetic shade selection.
• A systematically rearranged shade guide improves the accuracy of shade selection for complete dentures, enhancing clinical outcomes.