Novel Trends in Dental Color Match Using Different Shade Selection Methods: A Systematic Review and Meta-Analysis

Since color matching is considered a subjective procedure, accurate shade choice is often the most challenging stage of recreating the natural appearance of teeth. Furthermore, accurate determination of tooth color is imperative for the final outcome of dental restorations. The purpose of this research is to assess the accuracy of color match between diverse shade selection methods throughout a systematic review and meta-analysis. Two independent investigators (L.H. and R.B.) screened the literature in five electronic databases. Randomized controlled trials or in vitro papers studying the effect of using either digital shade selection or visual shade selection on the accuracy of color match were included. A total of 13 manuscripts comprised the meta-analysis. Color difference (ΔE) between restorations where the shade matching was performed by the conventional method was greater than those where the shade matching was performed by computerized methods (p = 0.007). According to the subgroup analysis, only the use of digital photographs for shade matching showed a reduction in the (ΔE) (p < 0.0001), while the use of a spectrophotometer has no advantages over the use of visual shade guide tabs (p = 0.57). On the other hand, global analysis showed that incorrect shade matching was higher when the conventional method using shade guide tabs was used (p < 0.001), irrespective of whether a spectrophotometer or a digital camera was used (p < 0.001). This study concluded that the use of digital photography and spectrophotometric measurements led to fewer color differences and less incorrect shade matching than conventional methods using color shade tabs.

The Accuracy and Reliability of Tooth Shade Selection Using Different Instrumental Techniques: An In Vitro Study

This study aimed to investigate and compare the reliability and accuracy of tooth shade selection in the model using 30 milled crowns via five methods: (1) digital single-lens reflex (DSLR) camera with twin flash (TF) and polarized filter (DSLR + TF), (2) DSLR camera with a ring flash (RF) and polarized filter (DSLR + RF), (3) smartphone camera with light corrector and polarized filter (SMART), (4) intraoral scanner (IOS), and (5) spectrophotometer (SPEC). These methods were compared with the control group or manufacturer’s shade. The CIE Lab values (L, a, and b values) were obtained from five of the methods to indicate the color of the tooth. Adobe Photoshop was used to generate CIE Lab values from the digital photographs. The reliability was calculated from the intraclass correlation based on two repetitions. The accuracy was calculated from; (a) ΔE calculated by the formula comparing each method to the control group, (b) study and control groups were analyzed by using the Kruskal–Wallis test, and (c) the relationship between study and control groups were calculated using Spearman’s correlation. The reliability of the intraclass correlation of L, a, and b values obtained from the five methods showed satisfactory correlations ranging from 0.732–0.996, 0.887–0.994, and 0.884–0.999, respectively. The ΔE from all groups had statistically significant differences when compared to the border of clinical acceptance (ΔE = 6.8). The ΔE from DSLR + TF, DSLR + RF, SMART, and SPEC were higher than clinical acceptance (ΔE > 6.8), whereas the ΔE from IOS was 5.96 and all of the L, a, and b values were not statistically significantly different from the manufacturer’s shade (p < 0.01). The ΔE of the DSLR + RF group showed the least accuracy (ΔE = 19.98), whereas the ∆E of DSLR + TF, SMART, and SPEC showed similar accuracy ∆E (ΔE = 10.90, 10.57, and 11.57, respectively). The DSLR camera combined with a ring flash system and polarized filter provided the least accuracy. The intraoral scanner provided the highest accuracy. However, tooth shade selection deserves the combination of various techniques and a professional learning curve to establish the most accurate outcome.

TOOTH SHADE & ITS CORRELATION WITH SKIN COLOR – ITS PERCEPTION ON SMILE ATTRACTIVENESS

Introduction: Shade selection is a crucial step in providing patients with a cosmetic restoration that blends in seamlessly with their dentition. Natural teeth are known to possess different shades. Many factors affect the color of natural teeth. One of the most critical variables and most often ignored is light. Another aspect that can affect the colors of natural teeth is the color imparted by different skin complexions. The objective of this study was to determine if skin tone and tooth color had the same inuence on smile attractiveness. Materials And Methods: A photograph of a woman's smile was digitally modied to obtain 16 images. Using the MAC color code as a reference, the skin tone was changed to four different tones (NW25: light, NC42:light medium, NW43:medium dark, NW50:dark), and the tooth shade was changed to four different tones (A1, A2, A3, A4) using the VITAPAN Classical shade guide. A total of 94 people completed a Google form questionnaire in which they scored each picture on the Visual Analog Scale for attractiveness. Results: Images NW25A1 and NW43A4 obtained the highest and lowest visual analog scale values, respectively. Conclusion: The overall results suggest that, regardless of the skin color, a lighter tooth shade has a major impact on smile attractiveness.

Shade Preference of Artificial Teeth in Denture Wearing Local Population- A Cross-sectional Study

Introduction: No existing local literature and guidance is currently available regarding shade selection by the patients for artificial teeth set of complete denture. Results of studies done in other countries cannot be generalised in our local population; hence there is a need to know the desires of our population. Keeping this research question in mind, this study reflects the behavioural aspects and wishes of patients towards artificial teeth shades. Aim: To observe and compare the shade preferences of artificial teeth during complete denture fabrication in diverse sample of both male and female patients in two different dental colleges. Materials and Methods: A cross-sectional study was conducted in the Department of Prosthodontics and Crown and Bridge, KM Shah Dental College and Hospital, Vadodara and Sri Guru Ram Das Institute of Dental Sciences and Research, Amritsar during the time period of May 2016 to September 2019. A total of 824 participants with complete denture treatment needs, participated from two different dental colleges. Upper anterior molds of Acry Rock (Ruthinium Dental Products Pvt., Ltd.,) acrylic teeth in 18 different shades of A1, A2, A3 A3.5, A4, B1, B2, B3, B4, C1, C2, C3, C4, D2, D3, D4, E1and F1 were used and participants were asked to choose aesthetically pleasing shades for themselves in both the colleges. The frequency distribution was recorded and compared using the Chi-square test for statistical analysis for preference of shades between male and female participants of two colleges. Results: The most preferred shades were A1, B1, D2 and E1 by both male and female participants in both the colleges and the shade selection was statistically significant (p-value=0.0018), while no statistically significant difference was seen in preference of shades between male and female participants at both the colleges. Conclusion: Patients primarily preferred the lighter shades with high values. This should be kept in mind during treatment planning to increase the psychological acceptance of aged patients towards artificial dentures.