Dentistry is a profession established on a strong scientific foundation. To progress and stay viable, creation of new knowledge is mandatory which must be made essential constituent of dental practice and education. The fundamental contrivance used to create new knowledge is research. Research is a creative work undertaken on a methodical basis in order to augment the existing knowledge and the use of this fresh knowledge to invent new applications. Research prevents the professionals from sleeping on their past achievements and glories and protects them from syncing into the depth of mediocrity.

Statement of Problem: Reliable bond to zirconia based materials has proven to be difficult, which is the major limitation against luting zirconia restorations.
Purpose: This in vitro study compared effect of selective infiltration etching (SIE) and tribochemical silica sandblasting (TSS) on microtensile bond strength to zirconia based material before and after different artificial aging intervals.
Materials and Methods: Twenty Lava plus high translucency zirconia disks (3M, ESPE) were randomly divided into two study groups, according to their surface treatment: (a) selective infiltration etching (SIE) and (b) tribochemical silica sandblasting (TSS). Zirconia disks were bonded to composite resin specimens using Panavia F2.0 resin cement. Zirconia resin bond strength was evaluated using the microtensile bond strength test (MTBS) and the test was repeated before and after the following intervals of accelerated artificial aging; 1 week, 2 weeks, 3 weeks and 4 weeks of water storage (37°C). A repeated measures ANOVA and Bonferroni post-hoc tests were used to analyze the data.
Results: The interaction between surface treatments and storage times were statistically significant. Data analysis revealed significant differences between the two surface treatments (P < 0.05). Selective infiltration etched specimens demonstrated relatively higher MTBS values than TSS (48.5 and 24.8 MPa). SEM examination of broken microbars revealed more interfacial failure type for TSS than SIE specimens that showed a predominantly cohesive failure type.
Conclusions: Selective infiltration etching provided superior micro-tensile bond strength results compared to tribo-chemical silica sandblasting. Established bond strength by selective infiltration etching was not affected by artificial aging as tribo-chemical silica sandblasting.

Aim: The aim of the current case-control study was to ascertain if individuals suffering from lung cancer show any difference s in periodontal disease severity compared to non-cancer individuals.
Methods: 172 individuals with lung cancer and 318 matching controls were selected. The measurements used to diagnose periodontal disease included Probing Pocket Depth (PPD), Clinical Attachment Loss (CAL) and Bleeding on Probing (POB). The control group was selected from the same city population with patients and their selection was based on patients’ social environment. Chi-square test and multiple logistic regression analysis model were used to evaluate the data.
Results: Patients with lung cancer showed a significantly high number of periodontal manifestations compared with controls. Lung cancer patients, had worst periodontal indices among all the indices examined such as PPD (p = 0.000), CAL (p = 0.028) and BOP (p = 0.010) after adjustment for smoking and socio-economic status.
Conclusions: Smoking and periodontal disease indices examined were found statistically significant with difference between cancer and non-lung cancer patients.