微钛钉种植体支抗压低前牙治疗露齿龈的效果及生物相容性分析

目的探讨微钛钉种植体支抗压低前牙治疗露齿龈的效果及生物相容性。方法选取在2016年1月～2017年8月于我院收治露齿龈患者100例为研究对象,并将患者分为对照组与研究组。对照组采取传统正畸治疗,研究组则采取微钛钉种植体支抗压低前牙治疗。观察两组正畸矫正疗效,对两组患者比较矫治前后两组微笑露龈长度、中切牙、侧切牙和尖牙的临床牙冠长度,对治疗期间患者种植体松动脱落率、种植体周围炎症发生率及种植体存留率等进行记录并对比。并统计随访患者治疗后1年期间覆牙合复发率。结果研究组患者在微笑露龈长度、中切牙、侧切牙和尖牙等变化差值上均显著高于对照组,差异有统计学意义(P <0.05)。治疗期间研究组患者松动脱落率为0,炎症发生率为2%,种植体存留率为100%。对一年内患者进行随访,研究组患者在覆复发率方面显著优于对照组,差异有统计学意义(P <0.05)。结论对于露龈笑患者采用微钛钉种植体支抗压低前牙的治疗效果优于传统正畸治疗方式,且前者具有较高的生物相容性。

微螺钉正畸支抗稳定性临床研究

目的探讨正畸治疗中微螺钉支抗的稳定性,分析影响稳定性的相关因素。方法回顾性分析2016年2月～2017年2月本院口腔正畸科门诊收治的32例行微螺钉支抗治疗患者的临床资料,共植入微螺钉种植体78枚。微螺钉种植体时间6～12个月,分析本组患者微螺钉正畸支抗稳定性,并调查影响稳定性的相关因素。结果本组患者78枚微螺钉种植体成功率为87.18%(68/78),松动脱落率为12.82%(10/78);年龄、性别、位置、牙弓、加力时机、钉周龈炎对微螺钉种植体稳定性无明显影响(P> 0.05);而植入后口腔感染、植入后1个月松动度对微螺钉种植体稳定性有影响(P <0.05)。结论微螺钉支抗装置虽具有较高稳定性,但在承载正畸负荷中仍无法保持绝对稳定,可受植入后口腔感染、植入后1个月松动度等因素影响,需引起高度关注。

Early Cretaceous Palynological Assemblages of the Shuangliao Fault Depression, Songliao Basin and their Geological Implications

The pollen and spores found in the Early Cretaceous strata of two cores from the Shuangliao Fault Depression were studied systematically, and two palynological assemblages have been recognized. Assemblage I from the Yingcheng Formation is named Paleoconiferus-Pinuspollenites; the assemblage is characterized by an extremely high content of Paleoconifer pollen. Assemblage II from Member 1 of the Denglouku Formation is named Cicatricosisporites-Cyathidites-Pinuspollenites; the assemblage is characterized by the abundant presence of Laevigati spores, but less Paleoconifer pollen. According to the palynological data and zircon U-Pb dating, the geological age of the Yingcheng Formation is thought to be Aptian-Albian, and that of the Denglouku Formation is thought to be Early Albian. On the basis of the composition of each assemblage, we can infer that during the depositional period of the Yingcheng Formation, the paleovegetation was mainly conifer forest, the paleoclimate was consistent with the temperate climate of today, and the paleoenvironment was humid feature. During the depositional period of Member 1 of the Denglouku Formation, the paleovegetation was mainly conifer forest and shrubs, the paleoclimate was consistent with the subtropical climate of today, and the paleoenvironment was humid. The results significantly improve our understanding of the stratigraphy in the Shuangliao Fault Depression, provide biostratigraphic evidence for the division and correlation of Early Cretaceous strata in the Shuangliao Fault Depression, and provide new data for analyzing paleovegetation and paleoclimate in the Songliao Basin.

Latest Zircon U-Pb Geochronology of the Huoshiling Formation Volcanic Rocks in the Southeastern Margin of the Songliao Basin

Objective The Huoshiling Formation is the earliest volcanic stratum in the Songliao Basin,composed mainly of intermediate-basic volcanic rocks,with rare fossils.The geological age of this formation has been controversial for long.

Zircon U-Pb Age of the Lamenzi Formation Volcanic Rocks in the Liuhe Basin of Southern Jilin Province, China

Objective A large number of Mesozoic volcano-sedimentary basins is distributed in southern Jilin Province,China,and filled with a great set of coal-bearing strata.According to the petroleum resources evaluation by previous researchers,these basins have decent exploration potential(Wang Dandan et al.,2017).The Liuhe Basin is one of the