Effect of porcine collagen matrix versus rotated pedicle palatal connective tissue flap on the soft-tissue closure after the immediate posterior implantation: study protocol for a randomised controlled trial.

Introduction: Soft-tissue defect is commonly seen in immediate maxillary posterior implantation because of tooth extraction wound and tension from bone graft. Bone graft materials exposure has a significant detrimental influence on bone augmentation. However, previous studies lack sufficient evidence to guide wound closure after immediate posterior implantation.

Correlation Analysis of Gut Microbiota and Serum Metabolome With -Induced Metabolic Disorders.

Periodontitis has been demonstrated to increase the risk of metabolic syndrome (MetS), but the underlying mechanism remains unclear. Recent studies have indicated periodontopathic bacteria such as could induce gut microbiota (GM) dysbiosis and aggravate metabolic disorders. However, the effects of microbial metabolites have barely been evaluated.

[A preliminary study on accuracy of implant digital impression].

Purpose: To evaluate the accuracy of implant digital impression，in order to provide guidance in digital implant prosthesis.

Methods: According to the requirements, 115 patients undergoing implantation were randomly selected. The implantation impression cap was placed and scanned with CBCT after esteosenesis.

[Study of angle between maxillary incisor and alveolar bone using cone-beam CT].

Purpose: To measure the angle between maxillary incisor and alveolar bone by the use of cone-beam CT (CBCT), in order to assess preoperative risks and provide guidance in anterior dental implantation.

Methods: A total of 374 patients were included and divided into 3 age groups: group 1 (18-34 years), group 2 (35-59 years) and group 3(above 60 years). All patients underwent CBCT preoperatively, the angle between maxillary incisor and alveolar bone was measured though Kavo eXam Vision software.

[Establishment and management of electronic appointment library for dental implant patients].

Purpose: To design an excel form which can prompt dental implant patient appointment through color change, which can scientifically manage implant EMR library through appropriate interlinkage and number.

Methods: An excel form based on operating system Windows XP was designed and software 2003 Microsoft excel was used, which was configured to change color with the passage of time by the use of command "conditional format".

Results: An excel form was designed.

[Clinical assessment of acceptability of shade mismatch of infiltrated alumina ceramic crowns].

Purpose: To measure and evaluate the acceptability of shade mismatch of infiltrated alumina ceramic crowns directly in clinic.

Methods: Ten cases with restoration of hot casting alumina ceramic crown were collected in clinic. L*, a*, b*, C, H, ΔE values of hot casting alumina ceramic crowns and corresponding natural teeth in natural light were surveyed and calculated, then analyzed with CIE1976L*a*b* color system, digital photography and Photoshop CS2.

[3-D reconstruction of the maxillary central incisor by digital camera].

Purpose: To evaluate the role of digital camera in reconstruction of 3-D solid model of the maxillary central incisor.

Methods: Photographs of each section of the maxillary central incisor were taken with digital camera, then the 3-D model was reconstructed with photoshop software and 3DMAX software.

Results: The precise 3-D solid model of the maxillary central incisor was successfully reconstructed.

[Non-invasive detection of metal casting defects using dental X ray machine].

Purpose: The purpose of this in vitro study is to find the best parameters in detecting the casting defects made of titanium, nickel-chromium and chromium-cobalt using dental X ray machine.

Methods: Casting sheets in different thickness (1.0 mm, 0.