The present work deals with the photocatalytic removal of Cr(VI) by zinc oxide particles. Cr(VI) removal capacity of 494.4 mg/g, 369.27 mg/g, and 355.59 mg/g was noted in sunlight, fluorescent, and dark conditions respectively at optimized parameters (pH: 5.0, initial Cr(VI) concentration: 50 mg/L, particle dosage: 10 mg/L, contact time: 60 min). A Langmuir isotherm model and pseudo first order kinetics were observed. The aggregation of Cr(VI) interacted ZnO particles was observed by dynamic light scattering (DLS), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). The results suggest the photon‐assisted reduction of Cr(VI) to Cr(III) on the ZnO particle. The EDX, FTIR, and EELS indicated Cr(VI) removal by an adsorption‐coupled reduction mechanism. Lower aggregation observed in the sunlight condition favoured enhanced Cr(VI) sorption compared to that in fluorescent light. Fourier transform infrared spectroscopy (FTIR) and energy‐dispersive X‐ray spectroscopy (EDX) confirmed the interaction of Cr(VI) on the particle surface and the electron energy loss spectroscopy (EELS) confirmed its subsequent reduction to Cr(III). The applicability of the process was studied with Cr(VI)–Cr(III) binary mixture and the multi–metal solutions.
A
bstract
Aim
The aim of the study was to evaluate the relationship between nasolabial angle (NLA) with maxillary incisor proclination (U1-NA) and upper lip thickness (ULT).
Materials and methods
Pretreatment lateral cephalometric radiographs of 120 patients were taken, and NLA, U1-NA, and basic ULT measurements were obtained for each patient. Descriptive statistics were calculated for all the variables involved in the study. The correlation was found using the Pearson correlation coefficient (r) test.
p
< 0.01 was considered statistically significant.
Results
The mean values of NLA, upper incisor proclination, and ULT were found to be 91.38° ± 7.10°, 34.21° + 5.17°, and 15.38 ± 1.76 mm, respectively. r (r = −0.583) was found between NLA and upper incisor proclination and (r = −0.040) for NLA and ULT.
Conclusion
There is a statistically significant relationship between NLA and U1-NA.
How to cite this article
Garg H, Khundrakpam D, Saini V,
et al.
Relationship of Nasolabial Angle with Maxillary Incisor Proclination and Upper Lip Thickness in North Indian Population. Int J Clin Pediatr Dent 2022;15(5):489-492.
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