Hydroxyapatite (HA) bio-ceramics implant tooth was tested through animal experiment and clinical application. HA tooth was placed into the fresh extraction socket. At first, HA tooth was chosen and implanted as fixed ...Hydroxyapatite (HA) bio-ceramics implant tooth was tested through animal experiment and clinical application. HA tooth was placed into the fresh extraction socket. At first, HA tooth was chosen and implanted as fixed maxillary front tooth in domestic rabbit immediately after extraction of tooth. Three to six months later satisfactory osseointegration between implanted HA teeth and periodontinum was observed. Clinically, 28 teeth in 25 patients were implanted with suitable HA teeth, chosen according to dental X-ray and models of different kinds of HA dental root. Crowning prosthesis with visible lightsolidfied material made the HA tooth wholesome and nice looking. Implantation and fixation of the HA teeth into the fresh extraction sockets of all the patients were successful.展开更多
We introduced the hydrophilic groups to acrylic bone cement to improve compliance and achieve more interdigitation between the bone and the acrylic bone cement in order to create better substrates for immediate loadin...We introduced the hydrophilic groups to acrylic bone cement to improve compliance and achieve more interdigitation between the bone and the acrylic bone cement in order to create better substrates for immediate loading. FTIR-ATR, contact angle, and maximum breach torque were employed for measurement. The results reveal that the introduction of hydrophilic functional groups has increased PMMA＇s surface hydrophilicity after contact angle test. FTIR-ATR results suggest the hydrophilic groups participate in the polymerization reactions, and maximum breach torque of the hydrophilic acrylic bone cements is near 110 Ncm torque. Those effects make it possible for conventional acrylic bone cement application in immediate loading of dental implant.展开更多
[Objectives] To explore the flexural strength of 3D printed titanium bone bionic dental implants and provide a scientific basis for the clinical application of 3D printed porous bionic bone dental implants. [Methods] ...[Objectives] To explore the flexural strength of 3D printed titanium bone bionic dental implants and provide a scientific basis for the clinical application of 3D printed porous bionic bone dental implants. [Methods] The cone-beam CT( CBCT) image information of 20 premolars extracted by orthodontic requirement was collected,and a new porous bone bionic dental implant was produced using modeling software and 3D printer. The premolars were divided into two groups( A and B). The universal testing machine was used to test the flexural strength of the two groups and the difference in flexural strength between the two groups was compared through statistics. [Results]Twenty 3D printed porous titanium bone bionic implants were accurately produced; the morphology of group A and group B were extremely similar to each other; the average flexural strength of group A was 2 767. 92 N,while the average flexural strength of group B was 778. 77 N,showing that the average flexural strength of group A was significantly higher than that of group B,and the difference was statistically significant( P < 0. 05).[Conclusions]The personalized porous structure root implants produced by 3D printing technology are very similar to the target tooth morphology,and show high accuracy and small error of production. Besides,the flexural strength of 3D printed personalized porous structure root implants can fully meet the requirements of the maximum occlusal force for dental implant restoration. It is expected to provide a scientific basis for clinical application of 3 D printed porous bionic bone tooth implants.展开更多
Objective To evaluate the success rates of immediate and delayed placement of implants with respect to the causes of tooth extraction and implant positions.Methods A total of 310 dental implants (immediate implants...Objective To evaluate the success rates of immediate and delayed placement of implants with respect to the causes of tooth extraction and implant positions.Methods A total of 310 dental implants (immediate implants∶delayed implants=76∶234) were inserted into 80 patients. The types,sizes and positions of the implants and the causes of tooth extraction were recorded. We then investigated the relationship of implant loss with the causes of tooth extraction and placement methods. Results A higher failure rate was found for the implants in the posterior region of the maxilla,and when periodontitis was cited as a reason for tooth extraction. The overall success rates were 93.4% and 95.7% in the immediate and delayed implant placement groups,respectively,after a 2-year follow-up. No obvious relationship of success rate was observed with the implant placement method,cause of tooth extaction,and implants’ position. Conclusion The immediate placement of implants into fresh extraction sockets could offer advantages over the delayed implant placement. It seems to be a safe and predictable method for patients.展开更多
文摘Hydroxyapatite (HA) bio-ceramics implant tooth was tested through animal experiment and clinical application. HA tooth was placed into the fresh extraction socket. At first, HA tooth was chosen and implanted as fixed maxillary front tooth in domestic rabbit immediately after extraction of tooth. Three to six months later satisfactory osseointegration between implanted HA teeth and periodontinum was observed. Clinically, 28 teeth in 25 patients were implanted with suitable HA teeth, chosen according to dental X-ray and models of different kinds of HA dental root. Crowning prosthesis with visible lightsolidfied material made the HA tooth wholesome and nice looking. Implantation and fixation of the HA teeth into the fresh extraction sockets of all the patients were successful.
文摘We introduced the hydrophilic groups to acrylic bone cement to improve compliance and achieve more interdigitation between the bone and the acrylic bone cement in order to create better substrates for immediate loading. FTIR-ATR, contact angle, and maximum breach torque were employed for measurement. The results reveal that the introduction of hydrophilic functional groups has increased PMMA＇s surface hydrophilicity after contact angle test. FTIR-ATR results suggest the hydrophilic groups participate in the polymerization reactions, and maximum breach torque of the hydrophilic acrylic bone cements is near 110 Ncm torque. Those effects make it possible for conventional acrylic bone cement application in immediate loading of dental implant.
文摘[Objectives] To explore the flexural strength of 3D printed titanium bone bionic dental implants and provide a scientific basis for the clinical application of 3D printed porous bionic bone dental implants. [Methods] The cone-beam CT( CBCT) image information of 20 premolars extracted by orthodontic requirement was collected,and a new porous bone bionic dental implant was produced using modeling software and 3D printer. The premolars were divided into two groups( A and B). The universal testing machine was used to test the flexural strength of the two groups and the difference in flexural strength between the two groups was compared through statistics. [Results]Twenty 3D printed porous titanium bone bionic implants were accurately produced; the morphology of group A and group B were extremely similar to each other; the average flexural strength of group A was 2 767. 92 N,while the average flexural strength of group B was 778. 77 N,showing that the average flexural strength of group A was significantly higher than that of group B,and the difference was statistically significant( P < 0. 05).[Conclusions]The personalized porous structure root implants produced by 3D printing technology are very similar to the target tooth morphology,and show high accuracy and small error of production. Besides,the flexural strength of 3D printed personalized porous structure root implants can fully meet the requirements of the maximum occlusal force for dental implant restoration. It is expected to provide a scientific basis for clinical application of 3 D printed porous bionic bone tooth implants.
文摘Objective To evaluate the success rates of immediate and delayed placement of implants with respect to the causes of tooth extraction and implant positions.Methods A total of 310 dental implants (immediate implants∶delayed implants=76∶234) were inserted into 80 patients. The types,sizes and positions of the implants and the causes of tooth extraction were recorded. We then investigated the relationship of implant loss with the causes of tooth extraction and placement methods. Results A higher failure rate was found for the implants in the posterior region of the maxilla,and when periodontitis was cited as a reason for tooth extraction. The overall success rates were 93.4% and 95.7% in the immediate and delayed implant placement groups,respectively,after a 2-year follow-up. No obvious relationship of success rate was observed with the implant placement method,cause of tooth extaction,and implants’ position. Conclusion The immediate placement of implants into fresh extraction sockets could offer advantages over the delayed implant placement. It seems to be a safe and predictable method for patients.
