Objective:To study the effect of heat-activated nickel-titanium arch wire for orthodontic treatment on local tissue inflammation and bone destruction.Methods:Patients who received orthodontic treatment with nickel-tit...Objective:To study the effect of heat-activated nickel-titanium arch wire for orthodontic treatment on local tissue inflammation and bone destruction.Methods:Patients who received orthodontic treatment with nickel-titanium arch wire in Hancheng People's Hospital between March 2012 and October 2017 were retrospectively studied, and according to the nickel-titanium arch wire materials in history data, the patients were divided into the experimental group who used heat-activated nickel-titanium arch wire and the control group who used common nickel-titanium arch wire. 1 week after treatment, the gingival crevicular fluid was collected to determine the contents of inflammatory cytokines as well as the mRNA expression of osteoblast markers and osteoclast markers.Results: 1 week after treatment, IL-1α, IL-1β, sTREM1 and HMGB1 contents as well as RANKL, 5-LOX, LTB4, TRACP5b and ODF mRNA expression in gingival crevicular fluid of experimental group were significantly lower than those of control group whereas OPG, Wnt3a, Runx2, OC, ALP and OCIF mRNA expression were significantly higher than those of control group.Conclusion: Heat-activated nickel-titanium arch wire for orthodontic treatment can be more effective than common nickel-titanium arch wire to reduce the local tissue inflammation and inhibit the bone destruction.展开更多
目的比较不同机用镍钛器械在后牙根管治疗中的临床应用效果。方法回顾性分析2021年1月至2021年6月于河南中医药大学第一附属医院口腔科行磨牙根管治疗的72例患者的临床资料,根据采用机用镍钛器械的不同分为A组、B组和C组各24例。所有患...目的比较不同机用镍钛器械在后牙根管治疗中的临床应用效果。方法回顾性分析2021年1月至2021年6月于河南中医药大学第一附属医院口腔科行磨牙根管治疗的72例患者的临床资料,根据采用机用镍钛器械的不同分为A组、B组和C组各24例。所有患者均接受后牙根管治疗,A组采用Wave One Gold机用镍钛器械治疗,B组采用Protaper Gold机用镍钛器械治疗,C组采用Protaper Universal机用镍钛器械治疗。比较三组每个根管预备时间、根管充填质量、临床疗效、牙根微裂情况及术后疼痛情况。结果A组患者的每个根管预备时间为(29.35±4.20)s,明显短于B组的(87.42±8.56)s和C组的(88.23±8.79)s,差异有统计学意义(P<0.05),但B组、C组患者的每个根管预备时间比较差异无统计学意义(P>0.05);A组、B组、C组患者的根管充填质量合格率分别为92.13%、96.47%、94.81%,治疗的总有效率分别为95.83%、91.67%、95.83%,牙根微裂发生率分别为4.17%、4.17%、8.33%,差异均无统计学意义(P>0.05);术后24 h内,三组患者的术后疼痛分级比较差异无统计学意义(P>0.05)。结论Wave One Gold、Protaper Universal、Protaper Gold机用镍钛器械在后牙根管治疗中疗效确切,相比于Wave One Gold,Protaper Universal、Protaper Gold的预备时间较长,且三者均不会明显增加牙根微裂发生率与术后疼痛程度。展开更多
Background As the only active component in final treatment phase of Tip-Edge Plus technique, the activation of nickel-titanium orthodontic archwires is one of the factors that affect the torque expression. It is neces...Background As the only active component in final treatment phase of Tip-Edge Plus technique, the activation of nickel-titanium orthodontic archwires is one of the factors that affect the torque expression. It is necessary to evaluate the mechanical properties of the nickel-titanium wire used in the final treatment phase in simulated oral environments to forecast the treatment outcomes. Methods The mechanical properties of 171 thermal nickel-titanium wires of 0.35 mm （0.014-in） in diameters with different deflection of 40 mm in length were investigated with three-point bending test. The samples were divided into 2 groups： as-received and bended groups. In the bended group, samples were divided into 7 subgroups according to the amounts of deflection and named by the canine angulations （-25~, -19~, -13~, -7~, -1~, ＋5~, ＋11~）. The deflection of wires was made by inserting the wires into the deep tunnel of Tip-Edge Plus brackets positioned in plaster casts with different canine angulations to mimic the use of nickel-titanium wires in the final treatment phase. Immersed the bended group in artificial saliva （pH 6.8） and preserved at 37.0~C. Eight durations of incubation were tested： 1 to 8 weeks. Three analogous samples of each group and subgroups were tested per week. Stiffness （YS：E） and the load-deflection characteristics of unloading plateau section were obtained. Results Significant changes in specific mechanical properties were observed in long-term immersed and large deflected wires compared with as-received groups. Both immersion time and deflection affected the mechanical properties of wires in the simulated oral environment, and the two factors had synergistic effect. In groups -25~, -19~ and -13~, stiffness （YS：E） increased then decreased and average plateau force and ratio of variance decreased then increased correspondingly at specific time. Conclusions In the final treatment phase of Tip-Edge Plus technique, the mechanical properties of nickel-titanium wire are associated with the using time and amounts of deflection and it may affect treatment outcomes. As the main reason for wire deflection, canine crown angulation plays an important role in the wire performance. It may be wise to focus on the canine crown angulations and using time in clinic with Tip-Edge Plus technique and make proper adjustment to help to make sure the treatment outcomes.展开更多
Background The shape memory effect of nickel-titanium （NiTi） archwires is largely determined by the phase transition temperature. It is associated with a reversible transformation from martensite to austenite. The a...Background The shape memory effect of nickel-titanium （NiTi） archwires is largely determined by the phase transition temperature. It is associated with a reversible transformation from martensite to austenite. The aim of this study was to characterize austenite, martensite and R phase temperatures as well as transition temperature ranges of the commonly used clinical NiTi orthodontic arch wires selected from several manufacturers. Methods Differential scanning calorimetry （DSC） method was used to study the phase transformation temperatures and the phase transition processes of 9 commonly used clinical NiTi alloys （types： 0.40 mm （0.016 inch）, 0.40 mm × 0.56 mm （0.016 inch × 0.022 inch））.Results The austenite finish temperatures （Af） of 0.40 mm Smart, Ormco and 3M NiTi wires were lower than the room temperature, and no phase transformation was detected during oral temperature. Therefore, we predicted that these types of NiTi did not possess shape memory property. For 0.40 mm and 0.40 mm × 0.56 mm Youyan I NiTi wires, no phase transformation was detected during the scanning temperature range, suggesting that these two types of wires did not possess shape memory either. The Af of 0.40 mm × 0.56 mm Smart, L＆H, Youyan II Ni-Ti wires were close to the oral temperature and presented as martensitic-austenitic structures at room temperature, suggesting the NiTi wires listed above have good shape memory effect. Although the 0.40 mm × 0.56 mm Damon CuNiTi wire showed martensitic- austenitic structures at oral temperature, its Af was much higher than the oral temperature. It means that transformation from martensite to austenite for this type of NiTi only finishes when oral temperature is above normal. Conclusion The phase transformation temperatures and transformation behavior varied among different commonly used NiTi orthodontic arch wires, leading to variability in shape memory effect.展开更多
文摘Objective:To study the effect of heat-activated nickel-titanium arch wire for orthodontic treatment on local tissue inflammation and bone destruction.Methods:Patients who received orthodontic treatment with nickel-titanium arch wire in Hancheng People's Hospital between March 2012 and October 2017 were retrospectively studied, and according to the nickel-titanium arch wire materials in history data, the patients were divided into the experimental group who used heat-activated nickel-titanium arch wire and the control group who used common nickel-titanium arch wire. 1 week after treatment, the gingival crevicular fluid was collected to determine the contents of inflammatory cytokines as well as the mRNA expression of osteoblast markers and osteoclast markers.Results: 1 week after treatment, IL-1α, IL-1β, sTREM1 and HMGB1 contents as well as RANKL, 5-LOX, LTB4, TRACP5b and ODF mRNA expression in gingival crevicular fluid of experimental group were significantly lower than those of control group whereas OPG, Wnt3a, Runx2, OC, ALP and OCIF mRNA expression were significantly higher than those of control group.Conclusion: Heat-activated nickel-titanium arch wire for orthodontic treatment can be more effective than common nickel-titanium arch wire to reduce the local tissue inflammation and inhibit the bone destruction.
文摘目的比较不同机用镍钛器械在后牙根管治疗中的临床应用效果。方法回顾性分析2021年1月至2021年6月于河南中医药大学第一附属医院口腔科行磨牙根管治疗的72例患者的临床资料,根据采用机用镍钛器械的不同分为A组、B组和C组各24例。所有患者均接受后牙根管治疗,A组采用Wave One Gold机用镍钛器械治疗,B组采用Protaper Gold机用镍钛器械治疗,C组采用Protaper Universal机用镍钛器械治疗。比较三组每个根管预备时间、根管充填质量、临床疗效、牙根微裂情况及术后疼痛情况。结果A组患者的每个根管预备时间为(29.35±4.20)s,明显短于B组的(87.42±8.56)s和C组的(88.23±8.79)s,差异有统计学意义(P<0.05),但B组、C组患者的每个根管预备时间比较差异无统计学意义(P>0.05);A组、B组、C组患者的根管充填质量合格率分别为92.13%、96.47%、94.81%,治疗的总有效率分别为95.83%、91.67%、95.83%,牙根微裂发生率分别为4.17%、4.17%、8.33%,差异均无统计学意义(P>0.05);术后24 h内,三组患者的术后疼痛分级比较差异无统计学意义(P>0.05)。结论Wave One Gold、Protaper Universal、Protaper Gold机用镍钛器械在后牙根管治疗中疗效确切,相比于Wave One Gold,Protaper Universal、Protaper Gold的预备时间较长,且三者均不会明显增加牙根微裂发生率与术后疼痛程度。
文摘Background As the only active component in final treatment phase of Tip-Edge Plus technique, the activation of nickel-titanium orthodontic archwires is one of the factors that affect the torque expression. It is necessary to evaluate the mechanical properties of the nickel-titanium wire used in the final treatment phase in simulated oral environments to forecast the treatment outcomes. Methods The mechanical properties of 171 thermal nickel-titanium wires of 0.35 mm （0.014-in） in diameters with different deflection of 40 mm in length were investigated with three-point bending test. The samples were divided into 2 groups： as-received and bended groups. In the bended group, samples were divided into 7 subgroups according to the amounts of deflection and named by the canine angulations （-25~, -19~, -13~, -7~, -1~, ＋5~, ＋11~）. The deflection of wires was made by inserting the wires into the deep tunnel of Tip-Edge Plus brackets positioned in plaster casts with different canine angulations to mimic the use of nickel-titanium wires in the final treatment phase. Immersed the bended group in artificial saliva （pH 6.8） and preserved at 37.0~C. Eight durations of incubation were tested： 1 to 8 weeks. Three analogous samples of each group and subgroups were tested per week. Stiffness （YS：E） and the load-deflection characteristics of unloading plateau section were obtained. Results Significant changes in specific mechanical properties were observed in long-term immersed and large deflected wires compared with as-received groups. Both immersion time and deflection affected the mechanical properties of wires in the simulated oral environment, and the two factors had synergistic effect. In groups -25~, -19~ and -13~, stiffness （YS：E） increased then decreased and average plateau force and ratio of variance decreased then increased correspondingly at specific time. Conclusions In the final treatment phase of Tip-Edge Plus technique, the mechanical properties of nickel-titanium wire are associated with the using time and amounts of deflection and it may affect treatment outcomes. As the main reason for wire deflection, canine crown angulation plays an important role in the wire performance. It may be wise to focus on the canine crown angulations and using time in clinic with Tip-Edge Plus technique and make proper adjustment to help to make sure the treatment outcomes.
文摘Background The shape memory effect of nickel-titanium （NiTi） archwires is largely determined by the phase transition temperature. It is associated with a reversible transformation from martensite to austenite. The aim of this study was to characterize austenite, martensite and R phase temperatures as well as transition temperature ranges of the commonly used clinical NiTi orthodontic arch wires selected from several manufacturers. Methods Differential scanning calorimetry （DSC） method was used to study the phase transformation temperatures and the phase transition processes of 9 commonly used clinical NiTi alloys （types： 0.40 mm （0.016 inch）, 0.40 mm × 0.56 mm （0.016 inch × 0.022 inch））.Results The austenite finish temperatures （Af） of 0.40 mm Smart, Ormco and 3M NiTi wires were lower than the room temperature, and no phase transformation was detected during oral temperature. Therefore, we predicted that these types of NiTi did not possess shape memory property. For 0.40 mm and 0.40 mm × 0.56 mm Youyan I NiTi wires, no phase transformation was detected during the scanning temperature range, suggesting that these two types of wires did not possess shape memory either. The Af of 0.40 mm × 0.56 mm Smart, L＆H, Youyan II Ni-Ti wires were close to the oral temperature and presented as martensitic-austenitic structures at room temperature, suggesting the NiTi wires listed above have good shape memory effect. Although the 0.40 mm × 0.56 mm Damon CuNiTi wire showed martensitic- austenitic structures at oral temperature, its Af was much higher than the oral temperature. It means that transformation from martensite to austenite for this type of NiTi only finishes when oral temperature is above normal. Conclusion The phase transformation temperatures and transformation behavior varied among different commonly used NiTi orthodontic arch wires, leading to variability in shape memory effect.
