Three eusauropod teeth(SDUST-V1064,PMOL-AD00176,PMOL-ADt0005)are reported from the Lower Cretaceous Yixian Formation of Ningcheng,southeastern Inner Mongolia,China.Two of them(SDUST-V1064,PMOL-AD00176)are assigned to ...Three eusauropod teeth(SDUST-V1064,PMOL-AD00176,PMOL-ADt0005)are reported from the Lower Cretaceous Yixian Formation of Ningcheng,southeastern Inner Mongolia,China.Two of them(SDUST-V1064,PMOL-AD00176)are assigned to early-diverging titanosauriforms in having slightly mesiodistal expansion at the base of the tooth crown,a slenderness index value>2.0 and<4.0,and D-shaped cross section.Furthermore,SDUST-V1064 and PMOL-AD00176 are referred as an Euhelopus-like titanosauriform on the basis of having a sub-circular boss on the lingual surface and an asymmetrical crown-root margin which slants apically,respectively.CT scan data of SDUST-V1064 reveals new dental information of early-diverging titanosauriforms,for example,the enamel on the labial side thicker than that on the lingual side,an enamel/dentine ratio of 0.26 and a boss present on the lingual side of the dentine of the crown.展开更多
Objective:To observe the effectiveness and safety of one-time endodontics in the treatment of chronic apical periodontitis with sinus tract in pediatric deciduous teeth.Methods:109 cases of children with chronic apica...Objective:To observe the effectiveness and safety of one-time endodontics in the treatment of chronic apical periodontitis with sinus tract in pediatric deciduous teeth.Methods:109 cases of children with chronic apical periodontitis with sinus tract in the deciduous teeth treated in our hospital from January 2022 to December 2023 were selected and grouped by the randomized numerical table method,with 54 cases in the experimental group and 55 cases in the control group.The experimental group was treated with one-time endodontics and the control group was treated with conventional endodontics.Results:After the treatment,the total effective rate of treatment was higher in the experimental group than in the control group(P<0.05);the incidence of adverse events was lower in the experimental group than in the control group(P<0.05);the satisfaction of the children's family members was higher in the experimental group than in the control group(P<0.05);the pain duration was lower in the experimental group than in the control group(P<0.05).Conclusion:In the experimental group,children with chronic apical periodontitis with sinus tract of the deciduous teeth were given one-time endodontic treatment,and the results of its implementation were relatively good.展开更多
The vibrator plate is the link between the vibroseis vehicle and the earth,as well as the core com-ponent of the vibrator vehicle.In this paper,the coupling effect between the vibrator plate and the earth is an-alyzed...The vibrator plate is the link between the vibroseis vehicle and the earth,as well as the core com-ponent of the vibrator vehicle.In this paper,the coupling effect between the vibrator plate and the earth is an-alyzed from two aspects of reaction tooth arrangement and reaction tooth conical angle,and three groups of experimental models are optimized and designed.The model construction and numerical analysis of the shear wave vibroseis vibrator plate are carried out with ANSYS software.The motion law between the vibration plate and the earth at work was studied,the strain energy of the three experimental models in operation,the maximum displacement of particle at the same position and other reference indices were compared and ana-lyzed,with 28 conical reaction teeth were arranged on both sides.The coupling effect between the vibration plate and the earth was best when the tooth angle was 60°.Compared with the toothless vibration plate,the energy efficiency is improved by about 20%,and the coupling effect between the vibrator plate and the earth is effectively enhanced.It is found that the coupling effect is enhanced through increasing the number of reac-tion teeth of the vibration plate by increasing the coupling area between the vibration plate and the earth.展开更多
目的:观察生物活性陶瓷材料iRoot BP Plus^(■)(Innovative BioCeramix Inc,Vancouver,BC,Canada)在儿童年轻恒前牙复杂冠折牙髓切断术中的应用,并对其预后进行分析,为该术式的更广泛应用提供临床参考。方法:收集2017年3月至2022年9月...目的:观察生物活性陶瓷材料iRoot BP Plus^(■)(Innovative BioCeramix Inc,Vancouver,BC,Canada)在儿童年轻恒前牙复杂冠折牙髓切断术中的应用,并对其预后进行分析,为该术式的更广泛应用提供临床参考。方法:收集2017年3月至2022年9月因恒前牙复杂冠折就诊于北京大学口腔医院急诊科,行以生物活性陶瓷iRoot BP Plus^(■)为盖髓剂的牙髓切断术患者。根据患者术前根尖片和初诊病历显示为年轻恒牙者,纳入97颗年轻恒牙进行研究。收集患者初诊及复查时的临床及影像学检查资料,临床检查包括根尖孔形成情况、松动度、牙冠颜色、牙髓活力测试(冷测)、有无脓肿和瘘管,影像学检查包括根周膜连续性、根尖周低密度影像、复诊时盖髓剂下方牙本质桥形成情况、髓腔及根管钙化情况,并对上述结果进行分析。结果:最终纳入有复诊记录的64例患者共75颗患牙,其中男性37例(57.8%),女性27例(42.2%),就诊时平均年龄为9.1岁,平均随访时长19.3个月。采用iRoot BP Plus^(■)盖髓的牙髓切断术后6个月成功率为96.0%,术后1年成功率为94.7%。术后复查2年以上者共23例,累计失败6例。成功率在患牙就诊时距外伤的时间是否超过24 h组中(P=0.61)以及是否松动组中(P=0.28)的差异无统计学意义。结论:对无移位性损伤的年轻恒牙复杂冠折患牙,采用iRoot BP Plus^(■)盖髓的牙髓切断术1年成功率很高,该术式具备广泛推广价值。展开更多
目的:观察不同年龄患者牙髓切断术的临床疗效,探讨牙髓钙化发生的情况和特点。方法:选择2019年10月到2022年8月就诊于北京大学口腔医院综合科龋源性露髓的成年恒前磨牙、恒磨牙行牙髓切断术的患者共77例,使用iRoot BP Plus生物陶瓷类材...目的:观察不同年龄患者牙髓切断术的临床疗效,探讨牙髓钙化发生的情况和特点。方法:选择2019年10月到2022年8月就诊于北京大学口腔医院综合科龋源性露髓的成年恒前磨牙、恒磨牙行牙髓切断术的患者共77例,使用iRoot BP Plus生物陶瓷类材料作为盖髓剂,一次法完成牙髓切断术。将患者按年龄分为3组,青少年组(11~20岁)25例,平均年龄(15.88±2.19)岁;中年组(21~50岁)27例,平均年龄(34.59±8.67)岁;老年组(51~83岁)25例,平均年龄(63.84±7.40)岁。术后1年复查,评价临床疗效,记录钙化桥形成、钙化桥厚度,以及牙髓钙化指数(pulp calcification index,PCI)。结果:3组患者在性别、牙列及牙位分布上差异均无统计学意义(P>0.05)。术后1年随访率为85.71%(66/77),其中青少年组随访率为88.00%(22/25),中年组随访率为85.19%(23/27),老年组随访率为84.00%(21/25)。3组病例1年复查临床成功率分别为95.45%(21/22)、91.30%(21/23)、95.24%(20/21),差异无统计学意义(P>0.05)。临床成功病例中,钙化桥出现率青少年组12例(57.14%,12/21),中年组8例(38.10%,8/21),老年组3例(15.00%,3/20),差异有统计学意义(χ^(2)=7.810,P=0.020<0.05)。3组间钙化桥厚度比较差异有统计学意义(F=4.434,P=0.020<0.05)。钙化桥厚度与年龄呈负相关(r=-0.516,P<0.05)。3组间PCI变化(ΔPCI)分别为0.67±0.58、0.43±0.51、0.25±0.52,差异有统计学意义(F=3.404,P=0.040<0.05)。结论:老年患者龋源性露髓牙髓切断术同样能够获得较高的成功率;牙髓切断术后钙化桥的发生率以及牙髓钙化的加速程度与年龄相关;青少年组更易形成钙化桥,同时也出现更明显的根管钙化加速现象。展开更多
目的:探究iRoot BP Plus在年轻恒牙活髓切断术中的应用及对患牙功能及美观度的影响。方法:选择笔者医院2019年1月-2022年5月收治的因外伤导致年轻恒牙冠折露髓的98例患者作为研究对象进行前瞻性研究,按照首诊就诊顺序随机均分为观察组...目的:探究iRoot BP Plus在年轻恒牙活髓切断术中的应用及对患牙功能及美观度的影响。方法:选择笔者医院2019年1月-2022年5月收治的因外伤导致年轻恒牙冠折露髓的98例患者作为研究对象进行前瞻性研究,按照首诊就诊顺序随机均分为观察组和对照组。对照组(49例)应用氢氧化钙行活髓切断术,观察组(49例)应用iRoot BP Plus行活髓切断术,比较两组手术情况、患牙修复效果、牙体功能、牙齿美观度及不良反应。结果:观察组患者疼痛持续时间、肿胀持续时间及手术时间均短于对照组(P<0.05);观察组修复有效率为95.92%,显著高于对照组的81.63%(P<0.05)。牙体功能方面,观察组患者的舒适功能评分显著高于对照组(P<0.05),两组固定功能、咀嚼功能、语言功能评分比较差异无统计学意义(P>0.05)。美观度方面,观察组患者的边缘适宜、染色情况均优于对照组(P<0.05),两组修复体完整情况比较差异无统计学意义(P>0.05)。观察组不良反应发生率4.08%,显著低于对照组的8.16%(P<0.05)。结论:iRoot BP Plus在年轻恒牙活髓切断术中的应用效果显著,患牙填充满意、恢复更快,能够更好地改善患牙功能及美观度,并且不良反应少,可以作为优选方案。展开更多
基金supported by the Scientific Research Foundation of Shenyang Normal University(Grant No.BS202207)Program for Innovative Research Team of Excellent Talents in University of Shandong Province(Grant No.2019KJH004)+3 种基金Taishan Scholar Program of Shandong Province(Grant No.tsqn201812070)Educational Department of Liaoning Province(Grant No.JYTQN2023422)Shandong Provincial Natural Science Foundation(Grant No.ZR2017MD031)the National Natural Science Foundation of China(Grant Nos.41972025,41688103,42161134003).
文摘Three eusauropod teeth(SDUST-V1064,PMOL-AD00176,PMOL-ADt0005)are reported from the Lower Cretaceous Yixian Formation of Ningcheng,southeastern Inner Mongolia,China.Two of them(SDUST-V1064,PMOL-AD00176)are assigned to early-diverging titanosauriforms in having slightly mesiodistal expansion at the base of the tooth crown,a slenderness index value>2.0 and<4.0,and D-shaped cross section.Furthermore,SDUST-V1064 and PMOL-AD00176 are referred as an Euhelopus-like titanosauriform on the basis of having a sub-circular boss on the lingual surface and an asymmetrical crown-root margin which slants apically,respectively.CT scan data of SDUST-V1064 reveals new dental information of early-diverging titanosauriforms,for example,the enamel on the labial side thicker than that on the lingual side,an enamel/dentine ratio of 0.26 and a boss present on the lingual side of the dentine of the crown.
文摘Objective:To observe the effectiveness and safety of one-time endodontics in the treatment of chronic apical periodontitis with sinus tract in pediatric deciduous teeth.Methods:109 cases of children with chronic apical periodontitis with sinus tract in the deciduous teeth treated in our hospital from January 2022 to December 2023 were selected and grouped by the randomized numerical table method,with 54 cases in the experimental group and 55 cases in the control group.The experimental group was treated with one-time endodontics and the control group was treated with conventional endodontics.Results:After the treatment,the total effective rate of treatment was higher in the experimental group than in the control group(P<0.05);the incidence of adverse events was lower in the experimental group than in the control group(P<0.05);the satisfaction of the children's family members was higher in the experimental group than in the control group(P<0.05);the pain duration was lower in the experimental group than in the control group(P<0.05).Conclusion:In the experimental group,children with chronic apical periodontitis with sinus tract of the deciduous teeth were given one-time endodontic treatment,and the results of its implementation were relatively good.
基金Supported by National Key Research and Development Program(No.20220101172JC).
文摘The vibrator plate is the link between the vibroseis vehicle and the earth,as well as the core com-ponent of the vibrator vehicle.In this paper,the coupling effect between the vibrator plate and the earth is an-alyzed from two aspects of reaction tooth arrangement and reaction tooth conical angle,and three groups of experimental models are optimized and designed.The model construction and numerical analysis of the shear wave vibroseis vibrator plate are carried out with ANSYS software.The motion law between the vibration plate and the earth at work was studied,the strain energy of the three experimental models in operation,the maximum displacement of particle at the same position and other reference indices were compared and ana-lyzed,with 28 conical reaction teeth were arranged on both sides.The coupling effect between the vibration plate and the earth was best when the tooth angle was 60°.Compared with the toothless vibration plate,the energy efficiency is improved by about 20%,and the coupling effect between the vibrator plate and the earth is effectively enhanced.It is found that the coupling effect is enhanced through increasing the number of reac-tion teeth of the vibration plate by increasing the coupling area between the vibration plate and the earth.
文摘目的:观察生物活性陶瓷材料iRoot BP Plus^(■)(Innovative BioCeramix Inc,Vancouver,BC,Canada)在儿童年轻恒前牙复杂冠折牙髓切断术中的应用,并对其预后进行分析,为该术式的更广泛应用提供临床参考。方法:收集2017年3月至2022年9月因恒前牙复杂冠折就诊于北京大学口腔医院急诊科,行以生物活性陶瓷iRoot BP Plus^(■)为盖髓剂的牙髓切断术患者。根据患者术前根尖片和初诊病历显示为年轻恒牙者,纳入97颗年轻恒牙进行研究。收集患者初诊及复查时的临床及影像学检查资料,临床检查包括根尖孔形成情况、松动度、牙冠颜色、牙髓活力测试(冷测)、有无脓肿和瘘管,影像学检查包括根周膜连续性、根尖周低密度影像、复诊时盖髓剂下方牙本质桥形成情况、髓腔及根管钙化情况,并对上述结果进行分析。结果:最终纳入有复诊记录的64例患者共75颗患牙,其中男性37例(57.8%),女性27例(42.2%),就诊时平均年龄为9.1岁,平均随访时长19.3个月。采用iRoot BP Plus^(■)盖髓的牙髓切断术后6个月成功率为96.0%,术后1年成功率为94.7%。术后复查2年以上者共23例,累计失败6例。成功率在患牙就诊时距外伤的时间是否超过24 h组中(P=0.61)以及是否松动组中(P=0.28)的差异无统计学意义。结论:对无移位性损伤的年轻恒牙复杂冠折患牙,采用iRoot BP Plus^(■)盖髓的牙髓切断术1年成功率很高,该术式具备广泛推广价值。
文摘目的:观察不同年龄患者牙髓切断术的临床疗效,探讨牙髓钙化发生的情况和特点。方法:选择2019年10月到2022年8月就诊于北京大学口腔医院综合科龋源性露髓的成年恒前磨牙、恒磨牙行牙髓切断术的患者共77例,使用iRoot BP Plus生物陶瓷类材料作为盖髓剂,一次法完成牙髓切断术。将患者按年龄分为3组,青少年组(11~20岁)25例,平均年龄(15.88±2.19)岁;中年组(21~50岁)27例,平均年龄(34.59±8.67)岁;老年组(51~83岁)25例,平均年龄(63.84±7.40)岁。术后1年复查,评价临床疗效,记录钙化桥形成、钙化桥厚度,以及牙髓钙化指数(pulp calcification index,PCI)。结果:3组患者在性别、牙列及牙位分布上差异均无统计学意义(P>0.05)。术后1年随访率为85.71%(66/77),其中青少年组随访率为88.00%(22/25),中年组随访率为85.19%(23/27),老年组随访率为84.00%(21/25)。3组病例1年复查临床成功率分别为95.45%(21/22)、91.30%(21/23)、95.24%(20/21),差异无统计学意义(P>0.05)。临床成功病例中,钙化桥出现率青少年组12例(57.14%,12/21),中年组8例(38.10%,8/21),老年组3例(15.00%,3/20),差异有统计学意义(χ^(2)=7.810,P=0.020<0.05)。3组间钙化桥厚度比较差异有统计学意义(F=4.434,P=0.020<0.05)。钙化桥厚度与年龄呈负相关(r=-0.516,P<0.05)。3组间PCI变化(ΔPCI)分别为0.67±0.58、0.43±0.51、0.25±0.52,差异有统计学意义(F=3.404,P=0.040<0.05)。结论:老年患者龋源性露髓牙髓切断术同样能够获得较高的成功率;牙髓切断术后钙化桥的发生率以及牙髓钙化的加速程度与年龄相关;青少年组更易形成钙化桥,同时也出现更明显的根管钙化加速现象。
文摘目的:探究iRoot BP Plus在年轻恒牙活髓切断术中的应用及对患牙功能及美观度的影响。方法:选择笔者医院2019年1月-2022年5月收治的因外伤导致年轻恒牙冠折露髓的98例患者作为研究对象进行前瞻性研究,按照首诊就诊顺序随机均分为观察组和对照组。对照组(49例)应用氢氧化钙行活髓切断术,观察组(49例)应用iRoot BP Plus行活髓切断术,比较两组手术情况、患牙修复效果、牙体功能、牙齿美观度及不良反应。结果:观察组患者疼痛持续时间、肿胀持续时间及手术时间均短于对照组(P<0.05);观察组修复有效率为95.92%,显著高于对照组的81.63%(P<0.05)。牙体功能方面,观察组患者的舒适功能评分显著高于对照组(P<0.05),两组固定功能、咀嚼功能、语言功能评分比较差异无统计学意义(P>0.05)。美观度方面,观察组患者的边缘适宜、染色情况均优于对照组(P<0.05),两组修复体完整情况比较差异无统计学意义(P>0.05)。观察组不良反应发生率4.08%,显著低于对照组的8.16%(P<0.05)。结论:iRoot BP Plus在年轻恒牙活髓切断术中的应用效果显著,患牙填充满意、恢复更快,能够更好地改善患牙功能及美观度,并且不良反应少,可以作为优选方案。