2-Benz­yloxy-1,2,4-triazolo[1,5-a]quinazolin-5(4H)-one

The title compound, C16H12N4O2, is a functionalized triazoloquinazoline with a substituted benz­yloxy group attached at the 2-position of a triazole spacer. The triazoloquinazoline fused-ring system is approximately planar (r.m.s. deviation = 0.016 Å) while the benzyl substituent is perpendicular to the ring system, making a dihedral angle of 65.29 (6)°. The phenyl ring of the benz­yloxy moiety is equally disordered over two sets of sites. A centrosymmetric N—H⋯N hydrogen bond connects mol­ecules into dimers

Oral Health Knowledge, Attitudes, and Behaviors of Qatari People

The purpose of this descriptive study was to determine the oral health knowledge, attitudes, and behaviors of Qatari people. The convenience sample consisted of 859 Qatari people between the ages of 18-72 from Hamad Medical Corporation Dental Department, Public Dental Health Care Centres, University of Qatar, Police and Army Departments, governmental schools, a private dental clinic, and citizens. Participants were asked to complete a self-designed questionnaire titled Oral Health Knowledge, Attitudes, and Behaviors of Qatari People. Prior to the study, 20 Arab college students responded to the questionnaire in a test-retest procedure to establish instrument reliability. The content validity of the questionnaire was established by a panel of dental hygiene experts at Old Dominion University. Questionnaire data were analyzed using frequencies, percentages, the chi-square test of independence, and the analysis of residual test. Findings revealed that 74.4% of the respondents visit a dental clinic for dental cleanings, but of this number, 62.2% did not receive any toothbrushing instructions; and 63.2% did not receive flossing instructions. Forty-eight point eight percent visit the dental hygienist or dentist when they experience pain and the majority (61.8%) brush more than once a day. Most of the respondents arrive late for dental care because of other commitments. The majority of respondents willingly accepted oral hygiene instructions given at each dental visit, demonstrate their home care technique to the dentist or dental hygienist, cooperate in an oral hygiene evaluation of their mouths at each dental appointment, and return for professional teeth cleaning appointments if necessary. Almost half of the respondents (46.9%) feel embarrassed when told that their oral hygiene needs improvement, or when they (38.2%) need to learn oral hygiene techniques from a professional of the opposite gender. Chi-square analysis revealed a statistically significant association among the demographic variables of either age, gender, level of education, or distance between their home and a dental clinic and the following items: the frequency of visiting the dental hygienist/dentist, toothbrushing frequency, the time spent each day cleaning the teeth, the reason for arriving late to the dental clinic, the reaction to oral hygiene instructions given at each dental hygiene appointment, the reaction when asked to demonstrate home care techniques at the dental clinic, the reaction when their oral hygiene is checked at each visit, the reaction when asked to return for several professional teeth cleaning appointments, and the embarrassment when told that oral hygiene needs improvement or when taught oral hygiene instructions. Results suggest an association between the demographic variables of age and level of education and the following items: accepting new oral hygiene concepts from dental hygienist/dentist, and following the hygienist\u27s/dentist\u27s instructions. In all, results suggest that the Qatari people surveyed have positive attitudes toward accepting oral healthcare, little knowledge of contemporary oral health concepts, and positive oral health behaviors

2-Eth­oxy-5-methylbis[1,2,4]triazolo[1,5-a:4′,3′-c]quinazoline

The title compound, C13H12N6O, is a functionalized ditriazoloquinazoline with substituted eth­oxy and methyl groups attached at the 2-position of each triazole spacer. The fused-ring system is essentially planar [r.m.s. deviation = 0.016 (2) Å]. In the crystal, a weak C—H⋯N hydrogen bond connects the mol­ecules into a chain along [101]

3-(Prop-2-en-1-yl)-2-sulfanyl­idene-1,2,3,4-tetra­hydro­quinazolin-4-one

The tetra­hydro­quinazoline fused-ring system of the title compound, C11H10N2OS, is approximately planar (r.m.s. deviation = 0.019 Å). In the crystal, adjacent mol­ecules are linked by N—H⋯O hydrogen bonds, forming a chain running along the b axis

3-Benzyl-8-meth­oxy-2-sulfanyl­idene-1,2,3,4-tetra­hydro­quinazolin-4-one

The tetra­hydro­quinazole fused-ring system of the title compound, C16H14N2O2S, is roughly planar (r.m.s. deviation = 0.039 Å); the phenyl ring of the benzyl substituent is aligned at 78.1 (1)° with respect to the mean plane of the fused-ring system. In the crystal, two mol­ecules are linked by a pair of N—H⋯S hydrogen bonds about a center of inversion, generating a dimer

N-[2,4-Dioxo-3-aza­tricyclo­[7.3.1.05,13]trideca-1(13),5,7,9,11-pentaen-3-yl]thio­urea

In the two independent mol­ecules in the asymmetric unit of the title compound, C13H9N3O2S, the aza­tricyclo­trideca­penta­ene ring system is approximately planar with r.m.s. deviations of 0.022 and 0.033 Å. The urea unit connected to the fused rings is approximately perpendicular [dihedral angles = 82.4 (1) and 82.7 (1)°]. In the crystal, the mol­ecules associate by N—H⋯O hydrogen bonds, forming a chain running along the a axis. The crystal studied was a non-merohedral twin with a fractional contribution of 49.6 (1)% for the minor domain

2-Phen­oxy-1,2,4-triazolo[1,5-a]quinazol­in-5(4H)-one

The triazoloquinazole ring system in the title compound, C15H10N4O2 is approximately planar (r.m.s. deviation = 0.035 Å). The phenyl ring of the phen­oxy substitutent is aligned at 59.3 (1)° with respect to this ring system. In the crystal, two mol­ecules are linked about a center of inversion by a pair of N—H⋯O hydrogen bonds, generating a dimer

2-Methyl­sulfanyl-1,2,4-triazolo[1,5-a]quinazolin-5(4H)-one

The non-H atoms of the title compound, C10H8N4OS, lie approximately in a common plane (r.m.s. deviation = 0.058 Å). In the crystal, two mol­ecules are linked across a center of inversion by a pair of N—H⋯N hydrogen bonds, forming a a dimer

5-Chloro-2-methyl­sulfonyl-1,2,4-triazolo[1,5-a]quinazoline

The triazoloquinazole fused-ring system of the title compound, C10H7ClN4O2S, is essentially planar (r.m.s. deviation = 0.009 Å). In the methyl­sulfonyl substituent, the two S—O bonds are of equal length [1.402 (2) Å]. In the crystal, adjacent mol­ecules inter­act weakly through Cl⋯N contacts [ca 3.197 (2) Å]

3-Benzyl-6-methyl-2-sulfanylidene-2,3-di­hydroquinazolin-4(1H)-one

In the title compound, C16H14N2OS, the quinazoline ring system is essentially planar, with a maximum deviation of 0.029 (3) Å. The dihedral angle between the quinazoline and benzene rings is 88.4 (2)°. In the crystal, adjacent mol­ecules are connected via pairs of N—H⋯S and C—H⋯O hydrogen bonds, which generate R 2 2(8) and R 2 2(10) graph-set motifs, respectively, resulting in a supra­molecular chain along the a axis