牙本质肩领厚度和高度对前磨牙抗折性的影响

发布时间：2018-05-31 05:02

本文选题：牙本质肩领 + 前磨牙　；参考：《安徽医科大学学报》2017年10期

【摘要】：目的研究牙本质肩领不同厚度和高度对纤维桩核冠修复后前磨牙抗折性的影响。方法 72颗下颌前磨牙根管治疗后随机分为3组,每组24颗,预备牙本质肩领高度分别为1、2、3 mm;每一高度组再随机分为3亚组,各8颗,预备牙本质肩领厚度颊舌、近远中分别为1.0、0.5 mm,1.5、1.0 mm,2.0、1.5 mm。所有样本牙行纤维桩核冠修复后于万能实验机上加载,记录牙体折裂时载荷值及折裂模式。结果折裂载荷均值显示:高度1 mm,厚度颊舌1.0 mm、近远中0.5 mm组最小,高度3 mm,厚度颊舌2.0 mm、近远中1.5mm组最大;单因素方差分析,高度一致时随厚度增加载荷均值提高,高度1 mm时厚度颊舌1.0 mm、近远中0.5 mm组与厚度颊舌1.5 mm、近远中1.0 mm组间差异无统计学意义;厚度一致时随高度增加载荷均值提高,厚度颊舌1.0mm、近远中0.5 mm时,高度2 mm组与高度3 mm组间差异无统计学意义。结论纤维桩核冠修复后的前磨牙牙本质肩领高1 mm、颊舌向厚1.0 mm、近远中厚0.5 mm即可行使正常咀嚼功能。牙本质肩领高度和厚度对前磨牙的抗折性交互作用,若牙本质肩领过薄/过低可通过保留更高的肩领高度/更厚的肩领厚度获得更大的抗折性能。
[Abstract]:Objective to study the effect of different thickness and height of dentin shoulder collar on the fracture resistance of premolars repaired with fibrous post-core crown. Methods after root canal treatment, 72 mandibular premolars were randomly divided into 3 groups, 24 in each group, the height of the predentine shoulder collar was 1 2 mm, and each height group was randomly divided into 3 subgroups, each with 8 teeth, the thickness of the dentine shoulder collar was prepared, and the thickness of the cheek and tongue of the dentine collar was prepared. In the proximal distance, it was 1.0 0. 5 mm / 1. 5 卤1. 0 卤1. 0 mm / 2. 5 mm 路m ~ (-1), respectively. All the teeth were repaired with fiber post core crown and loaded on a universal experimental machine to record the fracture load and fracture mode. Results the mean value of fracture load was 1 mm in height, 1.0 mm in thickness of buccal tongue, the smallest in proximal 0.5 mm, 3 mm in height, 2.0 mm in thickness of buccal tongue, and the largest in near distant 1.5mm group, and in univariate analysis of variance, the mean value of load increased with the increase of thickness when height was the same. The thickness of buccal tongue was 1.0 mm at 1 mm height, 1.5 mm in proximal 0.5 mm group and 1.5 mm in proximal distance 1.0 mm, and the mean load increased with the increase of height when the thickness was the same, the thickness of buccal tongue was 1.0 mm in thickness and 0.5 mm in proximal distance. There was no significant difference between 2 mm height group and 3 mm height group. Conclusion the normal masticatory function can be performed after the restoration of the premolar dentin with fibrous post core crown (1 mm), the thickness of cheek and tongue is 1.0 mm, and the proximal and middle thickness is 0.5 mm. The interaction between the height and thickness of dentin shoulder collar on premolars is that if the dentin shoulder collar is too thin or too low, the higher the shoulder collar height / the thicker shoulder collar thickness, the better the flexural resistance can be obtained.
【作者单位】：郑州大学第一附属医院口腔修复科;郑州大学口腔医学院;郑州大学附属郑州中心医院口腔科;
【基金】：河南省医学科技攻关计划项目(编号:201403120)
【分类号】：R783.3

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