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Background: Sometimes, porcelain restorations experience some degree of colour change in oral environment, which could be related to the quality of diet and surface roughness of these restorations. Objective: The aim of this in-vitro study was to evaluate the influence of Arabic-Coffee on the overall color of glazed or polished porcelain veneers fabricated from four different porcelain materials and two different thicknesses. Materials and Methods: A total of 160 porcelain disc of tested specimens were fabricated to a standardized thickness of 1.00 mm and 0.6mm using the following materials: Feldspathic porcelain, Zircon, E-max Press, and E-max CAD; (80 discs for each thickness and 20 specimens of each material used). Veneer specimens from each material were randomly divided into two subgroups (n = 10): 10 specimens were kept as glazed, were the other 10 tested specimens were adjusted with diamond burs, and then polished with Ivoclar Vivadent ceramic polishing kits using the recommended protocol for polishing provided by the company. A color of all tested specimens was measured using Vita Easy Shade Spectrophotometer. Then, all specimens were immersed in Arabic coffee (Al Mosafer Coffee, Saudi Arabia) and theromcycled for 1 week, and the colors of all tested specimens were then recorded again. Results: It was shown that there is a significant difference in the average color changes before and after immersing in Arabic-Coffee for all materials and thicknesses used in the current study. In-addition, significant differences in color changes were noticed between glazed and polished specimens. Moreover, colour change caused by the coffee was not significantly related to the thickness of the specimens used. Conclusion: Color stability of porcelain materials could be affected by surface treatment whether glazing or polishing. All aesthetic restorations should be deglazed whenever any adjustments have been done to maintain the color match and stability in an oral environment. Also, Arabic-Coffee is considered as a staining drink to a limited extend where patient should be assured to maintain their oral health to maintain the colour stability of their restorations.

Background This spectrophotometric study assessed the color stability of CAD/CAM restorative materials with different exposed surfaces following staining by hot Arabic Qahwa and cold coffee. Material/Methods Ninety-six specimens were fabricated from 3 different CAD/CAM ceramic materials: Vita Suprinity (Vita-S), Vita Enamic (Vita-E), and Vitablocs Mark II (Vitablocs-MII). We divided 32 specimens for each group into glazed or polished surfaces, with 16 specimens in each group, then subdivided them according to staining materials: Arabic Qahwa and Frappuccino Cold Coffee. Color of specimens was measured during immersion in staining materials (BEFORE) as baseline with (Vita classic) and (L, a, b), for average color changes (ΔE 00 ), then remeasured after 2, 4, and 12 weeks, and described as 1 st , 2 nd , and 3 rd measurements for VITAPAN Classic shade and T1, T2, and T3 for ΔE 00 values using the CIE L*a*b* equation. We performed ANOVA and then post hoc testing. Results We found significant differences in ΔE 00 values during immersing in hot Arabic Qahwa and cold coffee for tested materials in glazed or polished specimens. Polished specimens of Vita-S and Vita-E had the highest color changing and staining compared to glazed surfaces. Vitablocs-MII had the best color stability through immersion periods. Moreover, there were changes in relation to VITAPAN Classic shade guide for both Vita-S and Vita-E specimens during different immersion periods. Conclusions Coffee caused staining and contamination of ceramic material. Values of ΔE 00 for tested ceramic materials were significantly different but were within the clinically acceptable range. Polished specimens showed higher staining; therefore, we highly recommend re-glazing of ceramic restorations to maintain color stability.

Aim: This study assessed the prevalence and severity of temporomandibular joint disorders (TMDs) in the absence or presence of teeth of participants in Najran region in comparison with other adult participants in other regions with respect to gender differences and age. Furthermore, it investigates the frequency of symptoms of temporomandibular joint (TMJ) by clinical examination. Materials and methods:The total number of participants was 318 of both genders randomly selected for this study. The participants were divided into three age groups: 14 to 20, 21 to 40, and ≥41 years. The study was based on Fonseca's Anamnestic Index and its questionnaire, which is composed of 10 questions and classifies the severity of TMD. Clinical examination was performed for the patients to investigate the sign of TMJ dysfunctions. The obtained data were coded and entered into Statistical Package for the Social Sciences program for analysis using Chi-square test at significance level of 5%. Results:The participants with mild TMD dysfunction were 35.5%, whereas 18.6 and 3.5% were classified as moderate and severe TMD dysfunction respectively. The most reported TMD problems were related to poor articulation of teeth (23.9 and 25.5%), followed by frequent headache (15.1 and 33.6%), then grinding of teeth (15.4 and 34.9%) in "Yes" and "sometimes" answers respectively. The highest TMJ disorder was a frequent headache at 55.3%, followed by TMJ clicking at 21.1%. The remaining TMJ dysfunctions ranged between 11 and 13%. There was no significant difference between TMDs and gender (p ≤ 0.306). However, the severity of TMDs increased with increasing age (p ≤ 0.001) and was associated with tooth loss (p ≤ 0.000). Conclusion:The majority of the participants had mild-tomoderate TMDs and they were found among the middle-age group. The severity of TMDs increased with age and was associated with tooth loss. No significant difference between males ORIGINAL RESEARCH and females was found. The most reported TMD problems were related to the poor articulation of teeth, frequent headache, and grinding of teeth, while a headache followed by clicking of TMJ was the highest clinical TMJ disorder.