In vivo Measurement of Color Relationships between the Maxillary Central Incisor and Canine as a Function of Age

<p><strong>Abstract</strong></p> <p><strong><em>Introduction</em></strong></p> <p>It has long been taught that the basic shade (hue) of the patient can be taken from the canine (i.e. that tooth thought to have the highest chroma of a particular hue) and then that hue can be applied to other anterior teeth but at a lower chroma. However, this concept does not appear to derive from published measurements or observations. This study documented the color relationship between <em>in vivo</em> maxillary central incisors and canines to examine: (1) whether they share the same hue, but have different chromas (as commonly taught); and, (2) whether color differences (∆E values) change as a function of age.</p> <p><strong><em>Materials and methods</em></strong></p> <p>The L*a*b* values and Vita Classic shades of the maxillary central incisor and canine (62 subjects) were determined using a handheld spectrophotometer. Linear regression analysis and t-tests were used to describe the relationships of the L*a*b* values of these teeth within each patient and as a function of age.</p> <p><strong><em>Results </em></strong></p> <p>Linear regression analysis with a 95% confidence demonstrated a significant decrease in ∆E with age (p = 0.056). There was a significant age difference (p = 0.019) for the ∆E value between the central incisor and canine for those patients whose ∆E was greater than 3.3 (average age = 38.8) compared to patients with a ∆E less than 3.3(average age = 58.8) (t-test, p = 0.19). ∆C decreases significantly with age (p < 0.001). ∆H demonstrated a trend to decrease as a function of age (p = 0.2). ∆L remained the same over age (p = 0.21). The difference seen for all three color coordinates (hue, value and chroma) were due to a significant change in the central incisor while the canine remained constant with increasing age.</p>

Name thesis:degree_name

Master of Dental Science

Discipline thesis:degree_discipline

Dental Science

Year dc:date.available

2011

Author dc:creator

• Falcone, Marie E

Contributors dc:contributor

• John Agar; Patchanee Rungruanganut; Douglas Adams
• Robert Kelly

• Shade
• Age
• Chroma
• delta E
• Shade family
• Central incisor
• Canine
• Color Differences
• Color
• Tooth

Repository record dc:identifier

https://digitalcommons.lib.uconn.edu/gs_theses/148

OAI identifier oai:identifier

oai:digitalcommons.lib.uconn.edu:gs_theses-1162