Psychological factors and oral health during initial outbreak of COVID-19 in China: A cross-sectional study.

Objectives: To investigate associations between oral health and psychological factors (i.e., depression, anxiety, and resilience) in a group of Chinese individuals who had sought an intervention online during the COVID-19 pandemic.

A retrospective cohort study of peri-implant condition in Chinese patients with different periodontal condition and maintenance frequency.

Objectives: To compare the periodontal and peri-implant conditions of Chinese patients with a history of moderate or severe periodontitis and periodontally healthy patients (PHP); to evaluate the influence of maintenance therapy frequency on the outcome of implant therapy.

Methods: A total of 140 participants with 227 sand-blasted acidetched (SLA) implants were divided into three groups: PHP, moderate periodontally compromised patients (PCP) and severe PCP. The three groups were further categorized into two groups based on the frequency of maintenance (MF): MF ≥ 1 per year and MF < 1 per year.

[Technical complications rates and plaque control of fixed dental prostheses in patients treated for periodontal disease].

Objective: To compare the incidence of technical complications of implant-supported fixed dental prostheses in Chinese patients with a history of moderate or severe periodontitis and periodontally healthy patients(PHP) and analyze the effects of interproximal papillae patterns on food impaction and efficacy of plaque control.

Methods: A total of 103 partially edentulous patients treated with implant-supported fixed dental prostheses between December 2009 and December 2012 for a minimum 1-year follow-up period were recruited from Department of Periodontology, Peking University, School and Hospital of Stomatology. Based on the initial periodontal examination, the participants were divided into three groups: 30 PHP, 36 moderate periodontally compromised patients(mPCP) and 37 severe periodontally compromised patients(sPCP).