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A correlation holography technique for quantitative phase imaging from scattered depolarized light is proposed and experimentally demonstrated. To implement this technique, we exploit the depolarization of scattered light with the higher-order Stokes correlation. The higher-order Stokes correlation along with the two-step phase-shifting method is utilized to retrieve the complex Fourier coefficient, this subsequently supports the recovery of the phase in the correlation holography with the fourth-order correlation. A detailed theoretical framework is developed and is also supported by numerical simulation and experimental tests. The applicability of the proposed technique is experimentally demonstrated by quantitatively reconstructing different phase objects from the scattered depolarized light. [ABSTRACT FROM AUTHOR]

Aim: Gingival recession leads to root surface exposure and dentin hypersensitivity, which might cause an aesthetic impairment. This randomized trial was carried out for comparison and evaluation of the utility of bioresorbable collagen membrane (CM) and plateletrich fibrin (PRF) membrane in the treatment of localized gingival recession. Materials and Methods: A total of 36 subjects having localized gingival recession were randomly allocated from Department of Periodontology, Jagadguru Sri Shivarathreeshwara Dental College and Hospital, Mysuru, Karnataka, India, in two treatment groups, namely coronally advanced flap (CAF) combined with bioresorbable CM and CAF combined with PRF membrane. Plaque index, recession height (REC) and width of keratinized gingiva, and clinical attachment level were recorded at baseline, 1, 3, and 5 years. Results: The primary outcomes of the study were REC and complete root coverage (CRC). In the CAF + CM group, at the baseline, the residual REC was 3.01 ± 0.98 mm, after 1 year, it was 1.15 ± 0.88 mm, and 5 years later, it was 1.10 ± 1.04 mm; and in the CAF + PRF group, at the baseline, REC was 2.90 ± 0.52 mm, after 1 year, it was 0.45 ± 0.67 mm, and after 5 years, it was 0.38 ± 0.56 mm. Follow-up of 5 years showed statistically significant differences between the groups. After 5 years of follow up, in CAF + CM group, 60% of teeth showed CRC, and in CAF + PRF membrane group, 70% of teeth showed CRC. When we considered REC, statistical significant difference was observed between both the groups for the localized recession treatment; after 5 years, percentage of teeth presenting CRC showed no significant difference. Follow-up of 5 years showed differences, which was statistically significant between the groups. Conclusion: Though the usage of both the membranes showed satisfactory results, the PRF membrane promised to be a better alternative to CM. Also, PRF membrane could be a cost-effective alternative in the treatment of localized gingival recessions. [ABSTRACT FROM AUTHOR]