Context: Color difference between maxillar and mandibular incisors is an anticipated subject, and it will help dentists during color matching. Aim: The aim of this study was to evaluate color differences of the maxillar and mandibular incisors and to find out relationships between gender and age. Materials and Methods: This study was conducted on 125 participants (51 males and 74 females) between 16-63 age groups and totally over maxillar and mandibular 480 healthy teeth by using spectrophotometer. Color differences between teeth were calculated by using ∆E formula. One way ANOVA statistical analysis determined statistically significant differences between maxiller-central and mandibular-canine teeth for ∆L and ∆b parameters ( P <0.05). Results: According to t-test result there were not a statistically significant color differences for women and men teeth ( P <0.05). Scheffe statistical analysis results showed statistically significant differences between mandibular central and mandibular canine for ∆L parameters on 16-27, 28-39, and 52-63 age groups; for ∆b parameters, there were statistically significant differences between 16-27 and 40-51 age groups ( P <0.05). Conclusion: Women have more lighter teeth than men. Maxillar canines are more yellow and Maxillar centrals are more lighter than other incisors. 16-27, 28-39 age groups have more lighter teeth than 52-63 age groups and 16-27 age groups have more yellow teeth than 40-51 age groups.

ObjectiveThe aim of this study was to determine the effects of preparation vs nonpreparation of tooth surfaces and the types of porcelain laminate veneers (PLVs) on color changes after 300 hours of artificially accelerated aging (AAA).Materials and methodsForty extracted maxillary central incisors were used. The teeth were divided into four groups (n = 10) to evaluate preparation methods and porcelain types: Group A: tooth preparation with IPS e.max computer‐assisted design (CAD), group B: tooth preparation with IPS e.max press, group C: nonpreparation with IPS e.max CAD, and group D: nonpreparation with IPS e.max press. Veneers were fabricated and cemented using a dual‐polimerized cement. Initial color measurement was performed and repeated after AAA. Color changes were calculated with the CIEDE 2000 (ΔE00) formula. Color differences were analyzed with two‐way ANOVA (P < .05).ResultsThe two‐way ANOVA test showed no significant difference among the groups (P > .05). The highest color change value was observed in group C, followed by groups B, A, and D.ConclusionPreparation of veneers caused more color changes in PLVs than nonpreparation. However, IPS e.max CAD systems for fabrication of nonprepared PLVs increased the color change of the PLVs measured after AAA.Clinical SignificanceThe results provide information on the effect of the amount of preparation and the type of porcelain on color change in porcelain laminate veneers. In terms of esthetic dentistry, IPS e.max press and non‐prep treatment should be used in the anterior region, where esthetics are important.

Background Restoration of the teeth with extensive root canals with different post systems is a challenge for clinicians. Evaluation of these systems is important for clinical success. The aim of this study was to compare the fracture resistance and fracture mode of endodontically treated thin-walled teeth which restored with different post systems. Methods Eighty extracted and endodontically treated maxillary canines were divided into 4 groups (n = 20) and the thickness of the radicular dentin walls was reduced by using diamond burs. Each root was embedded in an autopolymerizing resin with a 0.25 mm layer of vinyl polysiloxane material to simulate the periodontal ligament. The subgroups were restored with one of the following post systems: only composite resin (Group 1), cast post (Group 2), glass-fiber post (Group 3), and I-TFC post (Group 4). The samples were subjected to a gradually increasing force (0,5 mm/min). The force required to fracture was recorded, and the data were analyzed with ANOVA, Tukey test's and Chi–Square test (p < 0.05). Results The highest fracture resistance was recorded for Group 2, followed by the Group 3, Group 4, and Group 1. Differences in the fracture resistance of teeth were significant among the groups (p < 0.05). The fracture resistance of Group 4 was significantly different than the other tested post systems (p < 0.05). Conclusions The lowest fracture resistance was recorded for Group 1, but among all post systems, Group 4 had the lowest fracture resistance. The fracture mode of the fiber posts (Radix and I-TFC posts) would permit repair of the tooth.

Objective The aim of this study was to evaluate the effect of the addition of antibacterial agents to composites on color changes after immersion of these composites in different beverages. Materials and Methods Composite resins containing antibacterial agents (bioactive glass [BAG] and nano‐zinc silicium [NZS]) and a control group (no agent) were produced. The treatment groups were as follows: control, BAG, NZS, and BAG + NZS. Forty‐eight disc‐shaped specimens (8 mm in diameter and 2‐mm thick) were prepared, with 12 specimens in each group. Color measurements were measured before and after immersion of the specimens in staining solutions (tea, coffee, and water) for 1, 7, and 30 days. The color measurements were repeated, and changes were calculated using the CIEDE2000 (ΔE00) formula. Results Color differences were analyzed using a two‐way analysis of variance and Tukey's tests. Significant differences were observed among the composite groups and solutions after all days in all the groups (P < .05). Conclusions The addition of the antibacterial agents did not reduce color changes. Color changes of the specimens immersed in coffee were greater than those of the specimens immersed in the other beverages, with the highest color change observed in the BAG groups. Clinical Significance The results provide information on the color stability of composite resins containing BAG and NZS and the staining potential of drinks commonly consumed in daily life. In terms of esthetic dentistry, BAG and NZS containing composites should be used in the posterior region, where there is a high risk of caries due to coloration.

<p><strong>Objectives:</strong> The aim of this study was to assesment of normal color vision and color vision-deficient dentists success ratio on color evaluation.</p> <p><strong>Materials and Methods:</strong> Dentists who have minimum 3 years clinical experience and between 26-63 years old (n=90) were included for this study. Ishihara color blindness test was applied in all dentists before the test applying. Two pieces from each color totally 32 (13 mm x 2.4 mm) porcelain specimens were fabricated. There were 32 tabs were to be matched; the</p> <p>dentists were asked to mark the correct color code</p> <p><strong>Results:</strong> Success rate of matching colors of color blind dentists was 33.92% ratio. The ratio in color vision dentists was 60.09%. Normal color vision dentists showed highest degree in matching at A3.5, B3, C4, D2 colors. Color vision-deficient dentists were unsuccessful in matching A1, B1, C1, B2, D2, A3 colors.</p> <p><strong>Conclusions:</strong> Color vision-deficient dentists were less succesfull than normal color vision dentists in color matching.</p> <p><strong>Keywords: </strong>Dentist, color blind, color selection.</p><p> </p><p><strong>ÖZET</strong></p> <p><strong>Amaç: </strong>Bu çalışmanın amacı,<strong> </strong>renk körü ve renk körü olmayan diş hekimlerinin renk seçimindeki başarı oranlarının değerlendirilmesidir.</p> <p><strong>Gereç ve Yöntem:</strong> En az 3 sene klinik deneyimi olan, yaşları 26 ile 63 arasındaki diş hekimleri (n=90) çalışmaya dahil edilmiştir. Test uygulaması yapılmadan önce tüm bireylere İshihara renk körlüğü testi uygulanmıştır. Ivoclar Klasik renk skalası referans alınarak, her bir renkten 2 şer adet olmak üzere toplam 32 adet disk (13 mm x 2,4 mm) hazırlandı. Aynı renkte olan porselen örneklerin eşleştirilmesi istendi.</p> <p><strong>Bulgular:</strong> Renk körü olan hekimler renkleri eşleştirmede başarı oranı 33,92 % dir. Renk körü olmayan diş hekimlerinde ise bu oran 60,09% dur. Renk körü olmayan diş hekimleri renk eşleştirmesinde sırasıyla A3.5, B3, C4, D2 renklerinde yüksek oranda başarı sağlamışlardır. Renk körü olan hekimler ise A1, B1, C1, B2, D2, A3 renklerinin eşleştirmesinde başarılı olamamışlardır.</p> <p><strong>Sonuç:</strong> Renk körü olan hekimler renk seçiminde, renk körü olmayan hekimlere göre daha başarısız olmuşlardır.</p>