Orthodontic tooth separation activates the hypothalamic area in the human brain

OBJECTIVES： An animal experiment clarified that insertion of an orthodontic apparatus activated the trigeminal neurons of the medulla oblongata. Orthodontic tooth movement is known to be associated with the sympathetic nervous system and controlled by the nucleus of the hypothalamus. However, the transmission of both has not been demonstrated in humans. The purpose of this study were to examine the activated cerebral areas using brain functional magnetic resonance imaging（MRI）, when orthodontic tooth separators were inserted, and to confirm the possibility of the transmission route from the medulla oblongata to the hypothalamus.METHODS： Two types of alternative orthodontic tooth separators（brass contact gauge and floss） were inserted into the right upper premolars of 10 healthy volunteers. Brain functional T2＊-weighted images and anatomical T1-weighted images were taken.RESULTS： The blood oxygenation level dependent（BOLD） signals following insertion of a brass contact gauge and floss significantly increased in the somatosensory association cortex and hypothalamic area.CONCLUSION： Our findings suggest the possibility of a transmission route from the medulla oblongata to the hypothalamus.

Comparison of measurements of anterior chamber angle via anterior segment optical coherence tomography and ultrasound biomicroscopy

BACKGROUND Glaucoma is an irreversible optic neuropathy with the loss of visual field and decrease of vision.The variable clinical manifestations may result in differential diagnostic difficulties.The early screening and diagnosis of glaucoma are currently experiencing a demand for anterior segment analysis tools that can gather more information with one short measurement.Therefore,we analyzed the agreement,difference,and correlation of chamber angle parameters such as angel opening distance at 500μm(AOD500)and trabeculo-iris space area at 500μm^2(TISA500)measured by anterior segment optical coherence tomography(ASOCT)and ultrasound biomicroscopy(UBM).AIM To compare the differences,correlation,and agreement in measuring AOD500 and TISA500 by AS-OCT and UBM.METHODS Both AS-OCT and UBM were performed to measure AOD500 and TISA500 in 45 subjects(72 eyes).All subjects without glaucoma were collected from October 2015 to August 2016 at the Ophthalmology Department of the Fourth Affiliated Hospital of China Medical University.Data of the two groups(AOD500 and TISA500)were compared by nonparametric tests.Pearson correlative analysis and Bland-Altman analysis were used to compare the correlation and agreement.RESULTS There were no significant differences between AS-OCT and UBM in measuring AOD500(P1=0.110,P2=0.633,P3=0.078,and P4=0.474)and TISA500(P1=0.584,P2=0.889,P3=0.297,and P4=0.550)of the four quadrants of the anterior chamber angle.There was a high correlation in measuring AOD500(r1=0.562,r2=0.671,r3=0.635,and r4=0.720;P<0.001)and TISA500(r1=0.584,r2=0.889,r3=0.297,and r4=0.550;P<0.001).There was a good agreement in measuring AOD500 and TISA500 by the two modalities.CONCLUSION There is a high correlation and agreement between AOD500 and TISA500 measurements by AS-OCT and UBM.They are interchangeable under some circumstances.AS-OCT proves to be a better early screening tool for glaucoma.

Hypothermia selectively protects the anterior forebrain mesocircuit during global cerebral ischemia

Hypothermia is an important protective strategy against global cerebral ischemia following cardiac arrest.However,the mechanisms of hypothermia underlying the changes in different regions and connections of the brain have not been fully elucidated.This study aims to identify the metabolic nodes and connection integrity of specific brain regions in rats with global cerebral ischemia that are most affected by hypothermia treatment.18F-fluorodeoxyglucose positron emission tomography was used to quantitatively determine glucose metabolism in different brain regions in a rat model of global cerebral ischemia established at 31–33℃.Diffusion tensor imaging was also used to reconstruct and explore the brain connections involved.The results showed that,compared with the model rats established at 37–37.5℃,the rat models of global cerebral ischemia established at 31–33℃had smaller hypometabolic regions in the thalamus and primary sensory areas and sustained no obvious thalamic injury.Hypothermia selectively preserved the integrity of the anterior forebrain mesocircuit,exhibiting protective effects on the brain during the global cerebral ischemia.The study was approved by the Institutional Animal Care and Use Committee at Capital Medical University(approval No.XW-AD318-97-019)on December 15,2019.

Anterior and posterior capsule densitometry levels after femtosecond laser-assisted cataract surgery

AIM： To analyze and compare five different variables over one year follow-up（1 wk, 1, 3, 6 and 12 mo）： anterior capsule（AC）, and posterior capsule（PC） area densitometry values, AC and PC linear densitometry values, and AC opening area reduction ratio after femtosecond laserassisted cataract surgery. METHODS： This was a prospective comparative study. Seventy-one patients underwent femtosecond laser-assisted cataract surgery on single eye between June 2014 and December 2015. A 5.0 mm diameter laser assisted anterior capsulotomy was performed on all eyes. In every postsurgery evaluation, AC opacificaction（ACO） and PC opacification（PCO） density levels were provided by Oculus Pentacam·HR using area and linear densitometry methods. Digital images were captured with a slit-lamp Topcon photographic camera and IMAGEnet· 5 software. The AC opening area on the digital images was measured using the Sketchandcalc area calculator and converted to reduction ratio levels.RESULTS： Using Pearson correlation coefficient（PCC）, we found no correlation（r=-0.091, P=0.46） in the twelfth month assessment between the evolution of ACO area densitometry values and PCO area densitometry values considered as independent variables. We found no correlation, using PCC（r=-0.096, P=0.43） between the evolution of ACO linear densitometry values and PCO linear densitometry values, in the twelfth month visit, working both as independent variables. AC linear densitometry levels and AC area densitometry levels continued to grow strongly from sixth to twelfth months. Analysis of the values of AC opening area reduction ratio（1 wk, 1, 3, 6, 12 mo） revealed statistically significant differences between the values of successive examinations but the magnitude of the change decreased. In the final period of monitoring between six and twelve months the magnitude of change was low.CONCLUSION： Our results show strong increases of Scheimpflug ACO densitometry values from the sixth to the twelfth month while capsulorhexis area reduction ratio levels displayed a considerable decrease. We found no correlation between ACO area and linear densitometry values and PCO area and linear densitometry values, in the twelfth month examination, working as independent variables.

Lateral Hypothalamic Area Glutamatergic Neurons and Their Projections to the Lateral Habenula Modulate the Anesthetic Potency of Isoflurane in Mice

The lateral hypothalamic area(LHA)plays a pivotal role in regulating consciousness transition,in which orexinergic neurons,GABAergic neurons,and melanin-concentrating hormone neurons are involved.Glutamatergic neurons have a large population in the LHA,but their anesthesia-related effect has not been explored.Here,we found that genetic ablation of LHA glutamatergic neurons shortened the induction time and prolonged the recovery time of isoflurane anesthesia in mice.In contrast,chemogenetic activation of LHA glutamatergic neurons increased the time to anesthesia and decreased the time to recovery.Optogenetic activation of LHA glutamatergic neurons during the maintenance of anesthesia reduced the burst suppression pattern of the electroencephalogram(EEG)and shifted EEG features to an arousal pattern.Photostimulation of LHA glutamatergic projections to the lateral habenula(LHb)also facilitated the emergence from anesthesia and the transition of anesthesia depth to a lighter level.Collectively,LHA glutamatergic neurons and their projections to the LHb regulate anesthetic potency and EEG features.

Effect of Acupuncture on Monoamines and Adenosine Triphosphatase Activityin Lateral Hypothalamic Area of ObeseRats

Objective: To study the mechanism of acupuncture in treating simple obesity. Methods: Central nerve push-pull perfusion and biochemical technique were used to observe the effect of acupuncture on the obese parameters, changes of monoamine transmitters and activity of ATPase in the lateral hypothalamic area (LHA) of obese rats. Results: Noradrenaline (NA) level in LHA of obese rats was higher but serotonin (5-HT) level and ATPase activity were lower than those in normal rats. After acupuncture treatment, in the same time of reducing body weight, NA level in LHA of rats was reduced, and 5-HT level and ATPase activity in it were increased.(P<0.05 and P<0.01). Conclusion:The effective regulation on LHA of obese rats is possibly one of the key factors in anti-obesity effect of acupuncture.

Influences of cerebellar interpositus nucleus and fastigial nucleus on neuronal activity of lateral hypothalamic area

Stimulation of cerebellar interpositus nucleus and (astigial nucleus could influence the neuronal activi-ty of lateral hypothalamic area in the cat, and some of the neurons which respond to the cerebellar stimulations are glucose-sensitive neurons. These results suggest that the cerebellum is involved not only in motor control, but also in the regulation of non-somatic functions through the cerebello-hypothalamic pathways.

Gastric vagal afferent inputs reach the glycemia-sensitive neurons of lateral hypothalamic area in the rat

The glycemia-sensitive neuron in lateral hypothalamic area (LHA) is one of the important central neural events involved in the feeding control. Electrophysio-logical studies have demonstrated that gastrointestinal vagal afferent inputs could convey the meal-related information of gastrointestinal tract to the hypothalamus. In this study, we examined whether the gastric vagal afferent inputs could reach the glycemia-sensitive neurons of the LHA by using in vivo extracellular recording technique in the rat. The results showed that stimulation of gastric vagal nerves elicited two types of the LHA neurons responses: the phasic response (93/116, 80.2%) and the change in cells firing pattern (23/116, 19.8%). Within the 93 cells that responded to the gastric vagal stimulation with a phasic response, 67 (72.0%) showed an inhibition in the cells firing rate, 26 (27.4%) were excited. Of the 23 cells that showed a change in the firing pattern, 13 responded to the gastric vagal stimulation with a long-lasting increase or decrease in firing rate, the remaining 10 cells turned their discrete spiking to the burst discharging. In addition, of 101 LHA neurons including the two types of responsive neurons, 73 (72.3%) were identified to be glyce-mia-sensitive neurons. These results demonstrated that the gastric vagal afferent inputs could reach the LHA and pre-dominantly reach those glycemia-sensitive neurons in the LHA. Presumably, the modulation of glycemia-sensitive neurons of LHA by the gastric vagal afferent inputs may play an important role in the short-term regulation of feed-ing behavior.

Effects of cerebellar interpositus nucleus on neuronal activity of lateral hypothalamic area

A growing body of research data showed a multitude of visceral and affective responsesfollowing cerebellar stimulation or cerebellar lesion. These findings implicate that, besidesits somatic function, the cerebellum may also be involved in the control of nonsomatic ac-tivities. However, the pathways through which the cerebellum performs its

在上颌前牙美学区种植中数字化导板的应用效果分析

目的 研究在上颌前牙美学区种植中运用数字化导板的效果。方法 选取2022年4月—2023年5月在本院接受上颌前牙美学区种植治疗的患者50例为研究对象,随机分为研究组和对照组,每组25例,研究组种植枚数32,对照组种植枚数30,分析治疗效果。结果 研究组治疗满意度高于对照组(P<0.05);研究组植入位置偏差低于对照组(P<0.05);研究组修复后牙菌斑指数低于对照组(P<0.05);研究组美学效果评分明显高于对照组(P<0.05);研究组不良反应发生概率低于对照组(P<0.05)。结论 数字化导板运用在上颌前牙美学区种植中,可降低植入位置偏差,改善牙菌斑指数、美学效果以及牙齿评分,降低不良反应发生率,值得运用。

CT下过敏性鼻炎患者翼管外口横截面积测量及其临床意义

目的 探讨过敏性鼻炎(allergic rhinitis, AR)、AR伴鼻窦炎、AR伴鼻窦炎及鼻息肉患者高分辨CT下翼管外口横截面积的变化差异及临床意义。方法 随机选取辽宁省人民医院耳鼻喉科2018年10月至2022年5月的80名患者,对照组(无过敏性鼻炎)20例与过敏性鼻炎组(60例)。80名患者共分为4组:对照组(Ⅰ组)20例、单纯过敏性鼻炎组(Ⅱ组)20例、过敏性鼻炎伴鼻窦炎组(Ⅲ组)20例、过敏性鼻炎伴鼻窦炎及鼻息肉组(Ⅳ组)20例。通过高分辨鼻窦冠状位CT对翼管外口进行定位,通过PASS软件系统对翼管外口进行类型分类,以及对翼管横截面积及双侧外口距离进行影像学测量,并对测量结果进行统计学分析。结果 (1)翼管外口在鼻窦冠状面呈圆形或扁圆形,口径大小不等,按照翼管分型方法,进行分型计数,统计学分析χ^(2)=2.470,P>0.05,各组翼管分型差异无统计学意义;(2)利用影像诊断工作站中多边形工具,进行翼管外口面积测量。4组平均翼管外口面积的q检验显示Ⅲ组、Ⅳ组与Ⅰ组翼管外口面积比较均差异有统计学意义(P<0.05);Ⅱ组与Ⅰ组比较,q=2.75,P>0.05,差异无统计学意义;Ⅳ组与Ⅲ组比较q=3.38,P<0.05,差异有统计学意义。而Ⅳ组出现翼管外口面积的增大的趋势最为明显;Ⅱ组、Ⅲ组、Ⅳ组与Ⅰ组翼管外口距离比较均差异有统计学意义(P<0.05):Ⅱ组与Ⅰ组比较,q=3.03,P<0.05;Ⅲ组与Ⅰ组比较,q=4.83,P<0.01;Ⅳ组与Ⅰ组比较,q=7.09,P<0.01;而Ⅳ组与Ⅲ组比较q=2.25,P>0.05,差异无统计学意义。结论 过敏性鼻炎(AR)、AR伴鼻窦炎、AR伴鼻窦炎及鼻息肉患者在高分辨CT下,翼管外口之间距离、翼管外口横截面积有差异,而AR伴鼻窦炎及鼻息肉患者在高分辨CT下翼管横截面积影响最大,有扩大的趋势,为翼管周围的手术提供解剖参考。

数字化导板在前牙美学区种植修复中的应用进展

近年来,随着数字化技术的日益发展及计算机辅助软件在口腔诊疗领域的拓展应用,基于口腔锥形束计算机断层扫描(CBCT)数据的三维(3D)打印数字化导板在口腔种植中被广泛运用,为精准种植修复带来了新的机遇与挑战。前牙区是种植手术中难度较高、美学风险较大的种植区域,对种植体植入精确度要求更高。本文就数字化导板的制作过程及在前牙美学区应用的意义、新进展、影响其精度的因素进行论述,以期为全面了解数字化导板在前牙美学区种植修复中应用进展提供参考。

黏膜支持式导板和牙支持式导板的应用对美学区前牙种植精准度及美学效果的影响

目的探讨黏膜支持式导板和牙支持式导板的应用及护理配合对美学区前牙种植精准度和美学效果的影响。方法选取2021年5月至2023年9月在我院接受美学区前牙种植的72例前牙缺损患者为研究对象,随机将其分为A组(36例58牙)和B组(36例49牙),A组运用黏膜支持式导板,B组运用牙支持式导板,实施专业护理配合进行牙种植,种植结束后进行锥形束CT(CBCT)拍摄,提取牙冠顶部、根尖部、牙根深度及角度等相关参数,计算出与种植前偏差值进行两组比较;同时运用红色美学评分(PES)和白色美学评分(WES)对两组美学效果进行评价。结果两组患者均顺利完成美学区前牙种植,A组牙冠顶部偏差、根尖部偏差、牙根深度偏差分别为(0.53±0.18)mm、(0.67±0.21)mm、(0.41±0.13)mm、角度偏差为(2.46±0.73)°,B组牙冠顶部偏差、根尖部偏差、牙根深度偏差分别为(0.41±0.13)mm、(0.45±0.17)mm、(0.32±0.11)mm、角度偏差为(1.97±0.55)°,组间比较差异均具有统计学意义(P<0.05)。术后随访3个月,A、B组WES评分分别为(8.62±1.72)分VS(8.79±1.75)分,差异无统计学意义(t=0.505,P=0.614);A、B组PES评分分别为(9.05±2.26)分VS(8.16±2.17)分,差异有统计学意义(t=2.067,P=0.041)。结论黏膜支持式导板和牙支持式导板对美学区前牙种植均可获得较好效果,牙支持式导板种植精准度优于黏膜支持式导板,美学区红色美学评分黏膜支持式导板优于牙支持式导板;临床应根据患者具体情况选择合适的数字化导板支持,以获得更为精准的种植精度和美学效果。

股前外侧区游离皮瓣移植术用于四肢软组织缺损修复中的效果观察

目的探讨分析股前外侧区游离皮瓣移植术用于四肢软组织缺损修复中的效果。方法于2020.6~2023.6期间,选取我院收治的四肢软组织缺损患者87例,按术式不同分2组,对照组(常规移植术)41例和观察组(股前外侧区游离皮瓣移植术)46例,对照分析两组治疗情况。结果与对照组皮瓣成活率相比,观察组明显更高(P<0.05);与对照组疗效满意度相比,观察组明显更高(P<0.05);与对照组并发症发生率相比,观察组明显更低(P<0.05);与对照组术后6个月的感觉功能评分相比,观察组明显更高(P<0.05)。结论四肢软组织缺损修复中应用股前外侧区游离皮瓣移植术可提高皮瓣成活率及疗效满意度,减少术后并发症,也能改善感觉功能。

改良盾构术联合浓缩生长因子用于前牙缺损修复中的美学效果及对种植区骨量的影响

目的探讨分析改良盾构术联合浓缩生长因子用于前牙缺损修复中的美学效果及对种植区骨量的影响。方法于2020.8~2023.8期间,选取我院收治的前牙缺损患者66例,均接受改良盾构术联合浓缩生长因子治疗,观察其美学效果及对种植区骨量的影响。结果术后6个月红色美学指数(PES)评分、角化龈厚度、角化龈宽度高于术前(P<0.05);术后6个月种植体颈部、根方2mm、根方4mm的唇侧骨厚度与术后即刻相比无明显差异(P>0.05);术后7d龈沟液C反应蛋白(CRP)、白介素-6(IL-6)、肿瘤坏死因子-α(TNF-α)较术后1d低(P<0.05);患者对前牙缺损修复治疗结果的满意度为96.97%。结论改良盾构术联合浓缩生长因子用于前牙缺损修复中能获得较高的美学效果,增加角化龈厚度、宽度,维持种植区骨量,也有助于降低局部炎症反应,加速愈合,且患者满意度高。

不同跳跃间隙对前牙区盾构术种植系统的生物力学影响

目的研究跳跃间隙对盾构术种植系统的生物力学影响,为后续临床制定跳跃间隙标准提供参考。方法依据临床特征建立4组跳跃间隙分别为0、0.5、1、1.5 mm盾构术种植系统三维模型,赋予对应的材料参数,模拟在特定咬合工况下各组模型的应力峰值以及应力分布情况。结果跳跃间隙非0 mm,即种植体与保留根片不接触时,种植体和基台应力随着跳跃间隙的增加而增大,根片及牙周膜应力峰值随着跳跃间隙的增加而减小。跳跃间隙为0 mm时,种植体、基台、根片及牙周膜的应力峰值均达到最大,且远超其他组。结论跳跃间隙对盾构术种植系统具有明显生物力学影响,建议临床取较大跳跃间隙。根片外形边缘做圆角处理,且下缘尺寸不宜过小。

上颌前牙区牙槽骨缺损形态与种植修复术后植骨吸收率的相关性及影响移植骨吸收的因素分析

目的探究上颌前牙区牙槽骨缺损形态与种植修复术后植骨吸收率的相关性,分析影响移植骨吸收的因素。方法选取2019年12月—2021年1月天津市第四中心医院接诊的51例牙列缺损患者作为研究对象,收集并整理患者的临床资料,所有受试者分别于植骨前、植骨后即刻和植骨6个月后行全口腔锥形束电子计算机断层扫描(CBCT),根据术前扫描结果将患者分为垂直型骨缺损组和水平型骨缺损组,并根据术后CBCT结果测定植骨吸收率。记录患者骨吸收率并根据骨吸收率水平将其分为高骨吸收率组和低骨吸收率组,采用Spearman法分析上颌前牙区牙槽骨缺损形态分类与移植骨吸收率的相关性,多因素Logistic逐步回归模型分析影响上颌前牙区牙槽骨缺损患者移植骨吸收的因素。结果Spearman相关性分析结果显示,水平型骨缺损间距与种植修复术后植骨吸收率无相关性(rs=0.241,P=0.826);垂直型骨缺损间距与种植修复术后植骨吸收率呈负相关(rs=-0.503,P=0.001)。多因素Logistic逐步回归结果显示,年龄>60岁[OR=3.766(95%CI:1.192,11.897)]、异体骨移植[OR=3.725(95%CI:1.179,11.767)]、牙槽嵴倒凹深度>1.0~2.0 mm[OR=5.830(95%CI:1.845,18.417)]、垂直型缺损间距偏大[OR=5.023(95%CI:1.717,14.695)]是影响上颌前牙区牙槽骨缺损患者移植骨吸收的独立危险因素(P<0.05)。结论垂直型骨缺损间距与种植修复术后植骨吸收率呈负相关,年龄>60岁、异体骨移植、牙槽嵴倒凹深度>1.0~2.0 mm、垂直型缺损间距偏大是影响上颌前牙区牙槽骨缺损患者移植骨吸收的独立危险因素。

术前MRI测量腘绳肌腱横截面积与前交叉韧带重建中移植物的相关性研究

目的:探讨测量MRI腘绳肌腱横截面积在行前交叉韧带重建术前与前交叉韧带重建中移植物的相关性。方法:收集2021年11月至2022年3月在骨关节科拟行前交叉韧带重建术的50例患者的MRI资料,男32例,女18例,年龄19~48(31.1±8.7)岁。术前对半腱肌和股薄肌腱进行MRI测量并记录,然后在关节镜下行前交叉韧带重建术,术中取股薄肌腱与半腱肌腱来制备最终所需移植的肌腱,并且在术中测量已制备好的最终移植物的直径。最后使用统计学软件分析得到数据。结果:MRI测量半腱肌肌腱横截面积、股薄肌肌腱横截面积、半腱肌肌腱与股薄肌肌腱横截面积之和与前交叉韧带术中所需移植物的直径大小呈显著正相关,r值分别为0.858、0.728、0.842(P<0.001),半腱肌肌腱与股薄肌肌腱横截面积之和的曲线下面积(area uder curve,AUC)、灵敏度、和特异性分别为0.925、90.48%、85.71%。结论:在进行前交叉韧带重建术的患者中,术前MRI测量与术中腘绳肌移植直径大小有具有较强的统计学相关性,半腱肌肌腱与股薄肌肌腱横截面积之和对于前交叉韧带重建术中移植物的直径大小有较高的预测价值,可以预测术中移植物的大小。

视觉因素对前交叉韧带重建患者足底压力中心的影响

目的 分析患者前交叉韧带重建(anterior cruciate ligament reconstruction,ACLR)术后早期与术后1年在视觉因素影响下足底压力中心面积(center of pressure area,COPA)和压力中心速度(center of pressure speed,COPS)等参数的变化。方法 纳入ACLR患者17例,于术后早期和术后1年测试足底COPA和COPS等数据;匹配17例健康受试者作为对照组。进行睁、闭眼不同视觉状态站立平衡测试,对各测量状态进行相关性分析。结果 双足站立测试时,短期组COPA和COPS在睁眼和闭眼对比均有统计学差异(P<0.05);长期组COPS睁眼和闭眼对比有统计学差异(P<0.001)。健侧站立时,各组间差异具有统计学意义(P<0.05),伤侧站立时各组间差异无统计学意义(P>0.05)。健侧站立睁眼条件下,长期组COPA高于短期组和对照组,对照组COPS低于短期组和长期组(P<0.01)。健侧站立闭眼条件下,对照组COPA低于短期组和长期组,对照组COPS低于长期组(P<0.01)。双足睁眼与双足闭眼之间、双足睁眼与伤侧睁眼之间、健侧睁眼和伤侧睁眼之间、健侧闭眼和伤侧闭眼之间在COPA和COPS上均呈正相关。结论 通过对ACLR患者站立位压力中心相关数据的分析,发现视觉对姿势稳定控制有重要影响。术后1年患者双足和单足站立时对比正常人稳定性波动较大,提示在临床上要加强术后长期训练以巩固康复效果,并对开展长期评估和制定精准训练计划具有一定的指导作用,以防止术后长时间功能退化和降低再次损伤的风险。

新疆地区人群上颌前牙牙根矢状位置及角度的CBCT分析

目的:通过锥形束计算机断层扫描(Cone-beam computed tomography,CBCT)分析新疆地区成人上颌前牙牙根的矢状位置及各分类的分布情况。方法:回顾性分析100名研究对象上颌中、侧切牙及尖牙的CBCT矢状位图像,根据牙根在牙槽骨中的位置分为颊侧型、中间型及腭侧型,并且测量牙根相对于牙槽骨长轴的角度。结果:大多数上前牙的牙根位于牙槽骨的唇侧(占76.0%),中间型占22.3%,腭侧型最少见,仅占1.7%。其中,中切牙唇侧型占73.0%、中间型占24.0%、腭侧型占3.0%,侧切牙唇侧型占68.0%、中间型占31.0%、腭侧型仅占1.0%,尖牙唇侧型占87.0%、中间型占12.0%、腭侧型仅占1.0%;中切牙、侧切牙及尖牙的牙根矢状角度分别为(8.84±2.62)°,(14.52±3.74)°及(19.39±6.24)°,两两比较差异均有统计学意义(P<0.05);不同牙根位置分型比较中,唇侧型(16.71±4.82)°显著大于中间型(6.36±2.60)°及腭侧型(7.52±6.20)°,差异有统计学意义(P<0.05)。结论:中国新疆地区人群上颌前牙牙根多位于牙槽骨唇侧,唇侧骨壁较薄,唇侧型尖牙的矢状角度最大,中间型尖牙矢状角度最小。