RESUMO
BACKGROUND:Bacterial adhesion is closely related to the surface properties of cobalt-chromium al oys, and therefore, the surface modification technology has become the focus of research in this area. OBJECTIVE:To verify whether the cobalt-chromium al oy with zirconium nitride coating can improve the bacterial adhesion of metal denture materials. METHODS:Magnetron sputtering deposition method was used to plate zirconium nitride film on the surface of cobalt-chromium al oys (experimental group), and cobalt-chromium al oy specimens uncoated served as control group. Streptococcus mutans, Candida albicans, and Actinomyces viscosus were respectively inoculated on the two kinds of test specimen, and at end of culture, the colony counting was done. RESULTS AND CONCLUSION:In the bacterial adhesion test, the number of colonies of three kinds of bacteria in the experimental group was significantly lower than that in the control group (P<0.05). The number of bacterial adhesion in the control group was significantly higher than that in the experimental group. These findings indicate that the cobalt-chromium al oy covered with zirconium nitride coating can significantly reduce the adhesion amount of Streptococcus mutans, Candida albicans and Actinomyces viscosus, and thus improve bacterial adhesion properties of cobalt-chromium al oys.
RESUMO
BACKGROUND:IPS e. max Press porcelain crown has been widely used in clinical restoration because of its aesthetic effect and biological properties. OBJECTIVE:To explore the effect of IPS e. max Press porcelain crown in esthetic restoration of anterior teeth in terms of marginal adaptation and color match. METHODS:Total y 52 patients with 138 defective anterior teeth (20 males and 32 females, 18-45 years old, including 62 anterior tooth defects, 46 tooth traumas, 30 denticles) were divided into two groups randomly:treatment group (26 cases) and control group (26 cases) were given IPS e.max Press porcelain crown and conditional Co-Cr al oy handcuffed ceramic crowns, respectively. Al the cases were asked for a second visit in 1 week after restoration, and the integrity of ceramic veneer, marginal adaptation, gingival health and color match were evaluated during 6-month and 2-year fol ow-ups. RESULTS AND CONCLUSION:The degrees of satisfaction on the color, shape and adaptation in the treatment group were al higher than those in the control group (P<0.05). At 6 months after restoration, the marginal adaptation, gingival health and color match in the treatment group were al better than those in the control group (P<0.05). At 2 years after restoration, there was also a significant difference in the marginal adaptation, gingival health and color match between the two groups (P<0.05). IPS e.max Press porcelain crown has the advantages of aesthetics and biological characteristics, so it can be used as an ideal restoration method for esthetic restoration of anterior teeth.
RESUMO
BACKGROUND:Titanium zirconium niobium tin al oy (Ti-Zr-NB-Sn al oy) has good tissue structure, mechanical properties, corrosion resistance and biocompatibility, which is an ideal dental material. OBJECTIVE:To explore the efficacy and safety of Ti-Zr-NB-Sn al oy in dental restoration. METHODS:A retrospective analysis was performed on clinical data of 87 cases of dental defects, including 43 males and 44 females, aged 22-41 years. Of the 87 cases, 43 cases were repaired with Ti-Zr-NB-Sn al oy as observation group, and the other 44 cases were treated with nichrome as control group. After 36 months of fol ow-up, the therapeutic efficacy, dental restoration conditions, dental prosthesis conditions and patient satisfaction were observed and compared. RESULTS AND CONCLUSION:Al the 87 patients were fol owed up for 36 months. After the fol ow-up, the total effective rate and patient satisfaction were higher in the observation group than the control group (P<0.05). In the control group, there were four cases of swol en gums, four cases of bleeding gums, four cases of al ergies, three cases of gum gray line, and six cases of mucosal pain;in the observation group, there was only one case of swol en gums, and the dental restoration was better in the observation group than the control group (P<0.05). For the dental prosthesis, there were 10 cases of dental stent damage and 20 cases of dental stent loosening in the control group;and only one case of dental stent damage and one case of dental stent loosening in the observation, and the observation group was superior to the control group in the dental prosthesis (P<0.05). Experimental findings suggest that Ti-Zr-NB-Sn al oy for repair of dental defects has good biocompatibility and security.