| 李萍萍,曹凯旋,李浩男,吴奇.体外研究全瓷冠与高嵌体修复后的力学性能[J].口腔材料器械杂志,2025,34(2):97-101. |
| 体外研究全瓷冠与高嵌体修复后的力学性能 |
| In vitro study on the mechanical properties after all-ceramic crowns and onlay restorations |
| 投稿时间：2024-07-01 修订日期：2024-10-21 |
| DOI：10.11752/j.kqcl.2025.02.06 |
| 中文关键词: 全瓷冠 高嵌体 破坏模式 力学性能 |
| 英文关键词:All-ceramic crown Onlay Failure mode Mechanical properties |
| 基金项目:国家自然科学基金项目（12102016）；中国康复研究中心科研课题项目（2021zx-Q11） |
|
| 摘要点击次数: 7 |
| 全文下载次数: 1 |
| 中文摘要: |
| 目的 通过体外实验比较全瓷冠与高嵌体修复根管治疗后牙齿的力学性能，研究牙冠高度变化对两种修复方式的影响。方法 选取180颗形态相似的下颌磨牙，随机分为两组进行修复，全瓷冠A组和高嵌体B组，再按牙冠高度（3.0-4.5 mm、4.6-6.0 mm、6.1-7.5 mm）分为3小组，每小组30颗。分别记录正压和侧压的最大载荷和破坏模式。结果 正压载荷A组均值（2.70±0.29）kN，B组（2.30±0.29）kN，两组差异具有统计学意义（P<0.05）；侧压载荷A组（0.50±0.14）kN，B组（0.49±0.06）kN，差异无显著性意义（P>0.05）；正压时与高度均没有显著的相关性。侧压时A组最大载荷与高度有相关性，B组的侧载极限在高度变化下保持稳定。A组随高度增加牙体破坏面积增加，但总体上B组牙根劈裂多于A组（P<0.05）。结论 高嵌体在固位力和侧载极限上表现出较好的稳定性，而全瓷冠修复受高度影响较大。高嵌体的破坏模式多出现牙根劈裂，随高度增加破坏面积减小，全冠修复以修复体劈裂为主，随高度增加破坏面积有增加趋势。 |
| 英文摘要: |
| Objective To compare the mechanical properties of all-ceramic crowns and onlay restorations after root canal treatment through in vitro testing, and to investigate the influence of crown height on both restoration types. Method A total of 180 mandibular molars with similar morphology were selected and divided into two groups: Group A (all-ceramic crowns) and Group B (onlays). Each group was randomly assigned into three sub groups based on crown height (3.0-4.5 mm, 4.6-6.0 mm, and 6.1-7.5 mm) with 30 teeth in each subset. Maximum loads under axial and lateral forces, as well as failure modes, were recorded and analyzed. Results The mean axial load was (2.70±0.29) kN in Group A and (2.30±0.29) kN in Group B, showing a statistically significant difference (P<0.05). The lateral load was (0.50±0.14) kN in Group A and (0.49±0.06) kN in Group B, with no statistically significant difference (P>0.05). Under axial loading, no significant correlation was found between crown height and load-bearing capacity. Under lateral loading, the maximum load in Group A correlated positively with crown height, while Group B remained stable regardless of height. In Group A, the damage area increased with height, whereas Group B showed a higher incidence of root splits (P<0.05). Conclusion Onlay restorations demonstrate better stability in terms of retention and lateral load limits, while the performance of all-ceramic crowns is more influenced by crown height. Onlay failure is more often associated with root splitting, with the extent of damage decreasing as crown height increases. In contrast, crown restorations primarily exhibit restoration splitting,with damage areas increasing with height. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|