IPS e.maxCAD和Lava Ultimate在贴面修复中的有限元分析  

Finite element analysis of IPS e.maxCAD and Lava Ultimate materials with different thickness in occlusal veneer

作　　者：黄依欢 李委航 马典 陈瑾[1] 钱捷[1] 李旭东 Huang Yihuan;Li Weihang;Ma Dian;Chen Jin;Qian Jie;Li Xudong(Dept.of Prosthodontics,Hospital of Stomatology,Kunming Medical University,Kunming 650106,China)

机构地区：[1]昆明医科大学附属口腔医院口腔修复科,昆明650106

出　　处：《国际口腔医学杂志》2023年第4期423-432,共10页International Journal of Stomatology

基　　金：云南省卫生健康委员会医学后备人才培养项目(H-2019019);昆明医科大学研究生创新基金(2021S148)。

摘　　要：目的对比不同厚度的2种材料制作的贴面修复左上颌第一磨牙的应力分布情况,为贴面的临床应用提供理论指导。方法提取左上颌第一磨牙的Micro CT数据,按不同厚度(0.6和1.0 mm)及不同材料[IPS e.maxCAD(LD)和Lava Ultimate(LU)]建立贴面修复左上颌第一磨牙的4个有限元模型,分别为LD0.6、LD1.0、LU0.6和LU1.0,模拟口内上颌第一磨牙的轴向载荷F1和侧方载荷F2,记录各载荷时贴面、牙体组织和粘接层的最大主应力(MaxPS)和最小主应力(MinPS)的大小及分布情况,对MaxPS和MinPS进行百分比量化的定量分析,并用威布尔分析计算各模型的失效概率。结果1)仅釉质达到该材料的拉伸强度;2)在各组中,LD组的贴面所受到MaxPS和MinPS绝对值显著大于LU组的,变化量分别为11.4%~34.7%和-18.2%~-9.5%;而LD组的牙体组织以及粘接层的MaxPS和MinPS绝对值小于LU组的,变化量分别为-187.1%~2.4%和-1.4%~16.9%。当修复体厚度由0.6增加为1.0 mm时,LD组的贴面所受到的MaxPS和MinPS绝对值显著减小,变化量分别为20.0%~21.0%和-5.7%~-3.9%;而LU组的MaxPS和MinPS绝对值变化不明显;3)F1的整体模型失效概率为LU0.6>LU1.0>LD0.6>LD1.0,轴向载荷F2的整体模型失效概率为LU0.6>LU1.0>LD1.0>LD0.6,F1的失效均低于F2。结论1)比起LU,LD制作的贴面承担更大的应力,从而保护其龈方的牙体组织和粘接层;2)厚度对LD的应力分布影响显著,而对LU的影响不显著。Objective This study aimed to compare the stress distribution in the left maxillary first molar restored with an occlusal veneer made of two kinds of materials with different thickness and provide a theoretical reference for the clinical application of occlusal veneer.Methods Micro CT data of the left maxillary first molar were extracted and four finite element models of the left maxillary first molar with an occlusal veneer of different thicknesses(0.6 and 1.0 mm)and different materials[IPS e.maxCAD(LD)and Lava Ultimate(LU)]were established,respectively,LD0.6,LD1.0,LU0.6,and LU1.0.Then,the axial load F1 and lateral load F2 of the maxillary first molar were simulated.The maximum principal stress(MaxPS)and minimum principal stress(MinPS)of occlusal veneer,tooth tissue and adhesive layer were recorded under two kinds of loads.The MaxPS and MinPS were quantitatively analyzed by percentage quantification and the failure probability of the models was calculated using Weibull analysis.Results 1)Only the enamel reached the tensile strength of the material.2)In each group,the MaxPS and the absolute value of MinPS of occlusal veneer of LD-restored teeth were significantly higher than that of LU-restored teeth,with variations of 11.4%-34.7%and from-18.2%to-9.5%,respectively.However,the MaxPS(from-187.1%to 2.4%)and the absolute value of MinPS(from-1.4%to 16.9%)of tooth tissue and adhesive layer of LD-restored teeth were lower than those of LU-restored teeth.When the restoration thickness increased from 0.6 mm to 1.0 mm,the MaxPS and the absolute value of MinPS of occlusal veneer of LD-restored teeth significantly decreased,with variations from 20.0%to 21.0%and from-5.7%to-3.9%,respectively,whereas that of LU-restored teeth did not change.3)The failure probability of overall models of F1 and F2was LU0.6>LU1.0>LD0.6>LD1.0 and LU0.6>LU1.0>LD1.0>LD0.6,respectively.Moreover,the failure probability of F1 was lower than that of F2.Conclusion 1)Compared with LU,occlusal veneer made by LD takes on more stress to protect the dental t

关 键 词：有限元分析 贴面 材料 厚度 

分 类 号：R783.3[医药卫生—口腔医学]