Initial bacterial adhesion on dental implant abutment is related to its surface chemical composition and physical characteristics.Selection of appropriate abutment materials resistant to bacterial adhesion is importan...Initial bacterial adhesion on dental implant abutment is related to its surface chemical composition and physical characteristics.Selection of appropriate abutment materials resistant to bacterial adhesion is important for dental implant maintenance.The aim of present study was to evaluate the effect of different properties of abutment materials on initial bacterial adhesion in vitro.Polished zirconia(PZ group), polished titanium(PT group) and ground titanium(GT group) samples were prepared to simulate clinical dental implant abutments.Chemical compositions, morphology, roughness, hydrophilicity and surface free energy of materials were analyzed.Oral commensal bacterium Streptococcus mitis was used to evaluate initial bacterial adhesion via turbidity test and colony-forming unit counting.The results showed that GT group presented the highest roughness, hydrophilicity and surface free energy.After 6-h incubation, GT group showed the significantly highest adhered bacteria counts;while non-significant difference existed between PT and PZ groups.Within the clinically applicable range used in present study, the surface physical characteristics, instead of surface chemical composition, of dental abutment material have the pronounced influence on initial 6-h bacterial adhesion.展开更多
Dental implants have spread worldwide in dentistry. The risks and complications reported are limited to local issues. However, in this case, a patient complained of systemic symptoms after dental implantation. This ca...Dental implants have spread worldwide in dentistry. The risks and complications reported are limited to local issues. However, in this case, a patient complained of systemic symptoms after dental implantation. This case report aims to demonstrate that systemic symptoms such as lumbago, shoulder stiffness, neck pain, hip joint pain, and facial pain improved after the removal of well-osseointegrated titanium implants. The results suggest that harmful electromagnetic waves received by implants affect body conditions;however, to date, the underlying mechanisms have not been identified. Therefore, further research is required.展开更多
The observation of the sparkling discharges during the micro-arc oxidation process in KOH aqueous electrolyte was achieved. The change of surface morphology was progressively observed and a plausible pore formation me...The observation of the sparkling discharges during the micro-arc oxidation process in KOH aqueous electrolyte was achieved. The change of surface morphology was progressively observed and a plausible pore formation mechanism is proposed. Cell proliferation and ALP activity of micro- arc oxidized titanium was evaluated by human body derived osteoblasts and sligtaly better than those of blasted surface.展开更多
Cell phone and personal computer users have increased considerably in recent years, particularly in more developed countries. These devices have facilitated communication on a global scale. However, there have been a ...Cell phone and personal computer users have increased considerably in recent years, particularly in more developed countries. These devices have facilitated communication on a global scale. However, there have been a number of reports of abnormalities occurring in the body due to the electromagnetic waves emitted by such electronic devices. The long lists of both general and severe symptoms, including headaches, fatigue, tinnitus, dizziness, memory loss, irregular heartbeat, and whole-body skin symptoms, have been reported that are apparently associated with the condition of electromagnetic hypersensitivity. In dentistry, titanium dental implants may be commonly associated with antenna-like activity, but the underlying mechanism remains unknown. In the current case studies, balance difficulties were found to occur when the patients had titanium dental implants. These implants seemed to be acting as antennae and collecting harmful electromagnetic waves. Further studies are required to confirm this hypothesis.展开更多
基金financially supported by the National Yang-Ming University Hospital (Nos.RD 2011-009, RD 2012-021 and RD 2013-013), Taiwan
文摘Initial bacterial adhesion on dental implant abutment is related to its surface chemical composition and physical characteristics.Selection of appropriate abutment materials resistant to bacterial adhesion is important for dental implant maintenance.The aim of present study was to evaluate the effect of different properties of abutment materials on initial bacterial adhesion in vitro.Polished zirconia(PZ group), polished titanium(PT group) and ground titanium(GT group) samples were prepared to simulate clinical dental implant abutments.Chemical compositions, morphology, roughness, hydrophilicity and surface free energy of materials were analyzed.Oral commensal bacterium Streptococcus mitis was used to evaluate initial bacterial adhesion via turbidity test and colony-forming unit counting.The results showed that GT group presented the highest roughness, hydrophilicity and surface free energy.After 6-h incubation, GT group showed the significantly highest adhered bacteria counts;while non-significant difference existed between PT and PZ groups.Within the clinically applicable range used in present study, the surface physical characteristics, instead of surface chemical composition, of dental abutment material have the pronounced influence on initial 6-h bacterial adhesion.
文摘目的:探讨在上前牙种植时使用钛网联合胶原膜和富血小板纤维蛋白(platelet rich fibrin,PRF)在修复唇侧骨板重度缺损的骨再生效果。方法:选择20例上前牙种植唇侧骨板重度缺损的患者,随机分为两组。一组使用骨粉+胶原膜+PRF进行骨增量,一组使用钛网+骨粉+胶原膜+PRF进行骨增量。埋入式愈合6个月二期手术,1月后修复。观察两组患者术前骨缺损情况及二期手术、修复1年后唇侧的骨厚度及边缘骨高度,并进行统计分析。结果:二期手术时实验组唇侧骨板重建丰满,新骨覆盖种植体顶端,CBCT示唇侧颈部骨厚度为2.82±0.12mm,对照组唇侧虽有新骨形成但成骨量较少,CBCT示唇侧骨厚度1.03±0.11mm,二者具有明显差异。对照组修复后1年唇侧骨厚度0.97±0.13mm,骨高度降低1.10±0.03mm。实验组修复后1年唇侧骨厚度2.77±0.21mm,骨高度降低0.89±0.05mm,但仍在植体顶端,与对照组有明显差异(P<0.05)。结论:在上前牙种植唇侧重度骨缺损时联合使用钛网和胶原膜引导骨再生(guided bone regeneration,GBR)比单纯使用胶原膜引导骨再生有更明显的成骨效果,因此在前牙重度骨缺损时可加用钛网保障骨增量的效果。
文摘Dental implants have spread worldwide in dentistry. The risks and complications reported are limited to local issues. However, in this case, a patient complained of systemic symptoms after dental implantation. This case report aims to demonstrate that systemic symptoms such as lumbago, shoulder stiffness, neck pain, hip joint pain, and facial pain improved after the removal of well-osseointegrated titanium implants. The results suggest that harmful electromagnetic waves received by implants affect body conditions;however, to date, the underlying mechanisms have not been identified. Therefore, further research is required.
文摘The observation of the sparkling discharges during the micro-arc oxidation process in KOH aqueous electrolyte was achieved. The change of surface morphology was progressively observed and a plausible pore formation mechanism is proposed. Cell proliferation and ALP activity of micro- arc oxidized titanium was evaluated by human body derived osteoblasts and sligtaly better than those of blasted surface.
文摘Cell phone and personal computer users have increased considerably in recent years, particularly in more developed countries. These devices have facilitated communication on a global scale. However, there have been a number of reports of abnormalities occurring in the body due to the electromagnetic waves emitted by such electronic devices. The long lists of both general and severe symptoms, including headaches, fatigue, tinnitus, dizziness, memory loss, irregular heartbeat, and whole-body skin symptoms, have been reported that are apparently associated with the condition of electromagnetic hypersensitivity. In dentistry, titanium dental implants may be commonly associated with antenna-like activity, but the underlying mechanism remains unknown. In the current case studies, balance difficulties were found to occur when the patients had titanium dental implants. These implants seemed to be acting as antennae and collecting harmful electromagnetic waves. Further studies are required to confirm this hypothesis.
