Current Issue : October - December Volume : 2013 Issue Number : 4 Articles : 5 Articles
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The red complex, which includes Porphyromonas gingivalis, Treponema denticola, and Tannerella forsythia (formerly Bacteroides\r\nforsythus), are recognized as the most important pathogens in adult periodontal disease. These bacteria are usually found together\r\nin periodontal pockets, suggesting that they may cause destruction of the periodontal tissue in a cooperative manner. This article\r\ndiscusses the interspecies pathogenic interactions within the red complex....
This study assessed the effect of qat chewing on periodontal health, independent of other risk factors. Four hundred qat chewers\r\nand 100 nonchewers (20ââ?¬â??50 years) were included. Demographic data and detailed information about chewing and smoking were\r\nobtained. Periodontal status was assessed using Community Periodontal Index (CPI) and clinical attachment loss (CAL). The qat\r\nchewers were older, included more males and smokers, and had worse oral hygiene but higher education levels; the majority were\r\nheavy chewers (mean duration of 14.45 years and frequency of 6.10 days/week). Regression analysis identified age, oral hygiene,\r\neducation level, and cigarette smoking as independent predictors of periodontal destruction. Adjusted for these, qat chewing\r\nshowed marginally significant association only with CAL (OR = 4.7; ?? = 0.049). The chewing sides showed significantly higher\r\nscores than the nonchewing sides; however, equal scores on both sides or lower scores on the chewing sides (possibly no or beneficial\r\neffect) were still observed in 50% of the chewers. Heavy qat chewing is shown here as an independent risk factor for attachment\r\nloss. However, the possibility that the habit may have beneficial effects in a subset of the chewers cannot be excluded. A holistic\r\nmodel that resolves the existing contradiction is presented....
Objective. To identify participantsâ�� satisfaction with appearance and the desired treatment to improve aesthetics. Materials and\r\nMethods. 220 participants (127 males and 93 females, mean age = 21.4 �± 1.5 years)were recruited into the study. A structured questionnairewas\r\nused to assess patientsâ�� satisfaction with appearance andwhat treatment they desire to improve aesthetics. Participants\r\nscored the level of satisfaction with appearance using visual analogue scale. Results.TheVASmean score of satisfactionwith general\r\nappearance was 6.8 �± 2.3. Half participants were dissatisfied with tooth appearance and 65.9% were dissatisfied with tooth colour.\r\nHigher VAS scores were associated with higher desire for all treatments that improve tooth appearance (P < .05). Dissatisfaction\r\nwith tooth appearance increased with increased dissatisfaction with teeth colour, feeling of poor tooth alignment, presence of\r\nfractured anterior teeth, and increased desire for orthodontic, crowns, and dentures treatments (P? < .05). Dissatisfaction with tooth\r\ncolour was associated with increased desire for tooth whitening and tooth coloured fillings (P < .05). Conclusions. Participants had\r\nhigh levels of dissatisfaction with tooth appearance and tooth colour. Dissatisfaction with tooth colour contributed to the increased\r\ndissatisfaction with tooth appearance. Dissatisfaction with tooth appearance, colour, alignment, and condition was significantly\r\nrelated to high desire for aesthetic treatments....
Introduction.Themechanical strength and the surface hardness of commercially available yttrium-doped zirconiawere investigated.\r\nFurthermore, a comparative study of eight different ceramic veneers, to be used for the production of two-layered all-ceramic\r\nrestorative systems,was carried out. Materials and Methods. Four types of zirconia specimenswere analyzed, according to a standard\r\nISO procedure (ISO 6872). Besides, two-layered zirconia-veneer specimens were prepared for three-point bending tests. Results. A\r\nstrong effect of the surface roughness on the mechanical strength of zirconia specimens was observed. Finally, a comparative study\r\nof eight commercially available veneering ceramics shows different modes of failure between the selected veneers. Conclusion. The\r\nresults indicate that close attention should be paid to the preparation of zirconia-based crowns and bridges by CAD/CAM process,\r\nbecause surface roughness has an important effect on the mechanical strength of the material. Finally, the results of the mechanical\r\ntests on two-layered specimens represent an important support to the choice of the veneering ceramic....
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