[Responses of litter decomposition in two subalpine plantations to simulated nitrogen deposition in central Yunnan, China].

From February 2018 to January 2019, a field experiment of simulated nitrogen (N) depo-sition was conducted in and plantations in the subalpine region of central Yunnan, China. The litterbag method was used for litter (leaf and twig) decomposition experiment in both plantations. Four levels of N addition were applied, .

The clinical study of CBCT imaging technology in the restoration of upper anterior teeth of the elderly.

Objective: To evaluate and analyze the clinical effect of CBCT imaging technology on the restoration of upper anterior teeth of the elderly.

Methods: 36 elderly patients with upper anterior teeth loss in our hospital from January 2018 to January 2020 were selected for implant restoration. Patients were equally randomized into a curved tomographic restoration group (TR group) and a CBCT restoration group (CR group).