Moazam, Ryhana Mohammad Zakir Hiyat
(2022)
The relationship between upper
anterior teeth colour and skin
colour in both genders among
Malaysians in USM Health Campus population.
Masters thesis, Universiti Sains Malaysia.
Abstract
Shade matching is the method used in dentistry to select artificial teeth colour.
However, shade matching is not possible in some cases where the adjacent tooth is
missing, discoloured, or unhealthy. Therefore, tooth colour shade selection according
to adjacent facial features were suggested by previous studies to be used. One of these
features was skin colour. The aim of this study was to find and model the relationship
between tooth colour and skin colour in a way that can be used in dentistry.
A convenience sampling was done to select 150 Malaysian staff and students
of the Hospital Universiti Sains Malaysia, Health Campus, with equal sex distribution
(75 males/ 75 females) to participate in this study. Digital photography was used to
measure skin colour and maxillary central and lateral incisors’ colour by taking photos
of participants’ faces and teeth in standardized settings. Photos were calibrated in
Adobe Lightroom, and then colour measurement was done in Adobe Photoshop. Vita
Easyshade spectrophotometer was also used to measure maxillary incisors’ colour.
The form of colours was described in CIELab system. Microsoft Excel was used to
develop the prototypes of Skin Shades Colour Chart, and Skin-Tooth Colour Chart by
considering the colour differences ΔE as the controlling factor of colour classifications.
The results of the t-test showed that there were significant differences in colour
readings between Vita Easyshade Spectrophotometer and digital photography in all
tests.
The t-test also showed that spectrophotometer did not show any significant differences
between males and females tooth colour. On the other hand, digital photography
showed that females had lighter teeth than males in central incisors (p < 0.05) and in
lateral incisors (p = 0.05) at significant level of 0.05.
Three equations resulted from multiple regression analysis that described the
direct relationship in digital camera’s readings between tooth colour (dependent
variable), and skin colour, tooth type, and gender (independent variables) to predict
tooth colour.
Two prototypes of colour charts were developed in this study, Skin-Tooth
colour chart that was driven from the Skin Shades Colour Chart. These two charts may
be used as a guiding tool in clinics for selecting tooth colour by matching the charts
with skin colour.
By considering these results, tooth colour can be predicted by using the
equations of this study, or by using the skin-tooth colour chart. Further studies should
be done to investigate the skin-tooth colour chart variations in larger and diverse
samples.
Actions (login required)
 |
View Item |
