Consensus of experts on the medical risk prevention for the patients with cardiovascular diseases during dental treatment (2022 edition) / 中华口腔医学杂志

With the aging process of population in the society, the prevalence of cardiovascular diseases (CVD) in China is increasing continuously and the number of dental patients with CVD is increasing gradually too. Due to the lack of guidelines for dental patients with CVD in our country, how to implement standardized preoperative evaluation and perioperative risk prevention remains a problem to be solved for dentists at present. The present expert consensus was reached by combining the clinical experiences of the expert group of the Fifth General Dentistry Special Committee, Chinese Stomatological Association and respiratory and cardiology experts in diagnosis and treatment for CVD patients, and by systematically summarizing the relevant international guidelines and literature regarding the relationship between CVD and oral diseases and the diagnosis and treatment of dental patients with heart failure, hypertension and antithrombotic therapy. The consensus aims to provide, for the dental clinicians, the criteria on diagnosis and treatment of CVD in dental patients in China so as to reduce the risk and complications, and finally to improve the treatment levels of dental patients with CVD in China.

Consensus of experts on the oral health management and medical risk prevention for the patients with chronic airway diseases (2022 edition) / 中华口腔医学杂志

Today, there is greater awareness on the association between oral diseases and respiration diseases after the outbreak of COVID-19. However, confusion regarding the oral health management and medical risk prevention for patients with chronic airway diseases has been remained among dental clinicians. Therefore, the dental experts of the Fifth General Dentistry Special Committee, Chinese Stomatological Association, combined with the experts of respiratory and critical care medicine, undertook the formation of consensus on the oral health management of patients with chronic airway diseases in order to help dental clinicians to evaluate medical risks and make better treatment decision in clinical practice. In the present consensus report, the relationship of oral diseases and chronic airway diseases, the oral health management and the treatment recommendations of patients with chronic airway diseases are provided.

Biomechanical properties of the complete mandibular subperiosteal implant under different bite loads / 医用生物力学

Objective To investigate biomechanical properties of the complete mandibular subperiosteal implant under four different bite loads, and provide some references for the personalized implant design in clinical cases. Methods Based on the three-dimensional model of human mandible, two kinds of matching complete mandibular subperiosteal implants, meshy base (implant 1) and zonary base (implant 2), were established, respectively. Stress distributions of both the two implants under four different bite loads were calculated and compared. Results The maximum stress of implant 1 was 230.42 MPa under the load Ⅳ and that of implant 2 was 311.11 MPa under the load Ⅰ. The stress distributions and maximum stress showed that the implant with meshy base had better resistance to the vertical loads, while the implant with zonary base had better resistance to the horizontal loads. Conclusions Rational arrangement for the number of posts and the distance between posts can effectively control the stress of implants. Posts should be placed in a vertical direction with the alveolar bone to avoid amplifying the horizontal component. In addition, posts should be well bounded to the bases, so that the stress on the bottom of posts won’t be at a high level. The complete denture should be guaranteed to contact at several spots during centric, protrusive and lateral bites to keep occlusion balance and decrease the maximum tensile stress on the contact surface.

Investigation of the color of anterior teeth, vermilion and attachment gingiva of 151 Uygur youth / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To analyze the characteristics of color of Uygur's oral soft and hard tissue.</p><p><b>METHOD</b>One hundred and fifty-one Uygur medical students (18 to 22 years) were included in this study. The Lab*, Cab*, Hab0, values of subjects' anterior teeth, upper and lower vermilion, attachment gingiva were measured.</p><p><b>RESULTS</b>The mean and distribution of Lab*, Cab*, Hab0, values of Uygur youth' anterior teeth were obtained. The Lab* values of attachment gingiva, upper and lower vermilion in male were 50.50 +/- 3.59, 41.92 +/- 4.10, 45.02 +/- 3.06, and Cab* were 29.94 +/- 3.21, 27.00 +/- 2.47, 30.35 +/- 2.67, and Hab0 were 30.00 +/- 3.27, 31.71 +/- 3.69, 27.73 +/- 3.27, respectively. The Lab* values of attachment gingiva, upper and lower vermilion in female were 54.28 +/- 5.06, 41.73 +/- 3.70, 47.27 +/- 2.97, and Cab* were 27.98 +/- 3.93, 27.23 +/- 2.42, 31.22 +/- 2.59, and Hab0 were 33.39 +/- 3.67, 32.28 +/- 3.68, 27.57 +/- 2.65.</p><p><b>CONCLUSIONS</b>There was a specific color space distribution pattern in oral soft and hard tissue in Uygur youth. There was a trend of decreasing lightness, increasing saturation, and red hue shifting from the center to both distal directions. There was statistical significant gender difference in color of tooth and attachment gingiva. What's more, there was extremely significant difference between upper and lower vermilion.</p>