Lin Hsi-Kuei, Lin Jerry Chin-Yi, Pan Yu-Hwa, Salamanca Eisner, Chang Yi-Ting, Hsu Yung-Szu, Wu Yi-Fan, Lin Chin-Kai, Dorj Odontuya, Chang Wei-Jen
School of Dentistry, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
School of Oral Hygiene, College of Oral Medicine, Taipei Medical University, Taipei 110, Taiwan.
J Pers Med. 2022 Jul 27;12(8):1226. doi: 10.3390/jpm12081226.
Preserving the marginal bone level (MBL) is essential for the long-term success of dental implant therapy, and bone remodeling around dental implants is considered to vary with time. Numerous studies comparing the platform-switching (PS) and platform-matching (PM) dental implants have indicated that PS dental implants showed a lesser reduction for the MBL, and the majority of them had a relatively short period. This study aimed to evaluate vertical and horizontal bone defects by using digital periapical radiographs to examine the changes in MBL around PM and PS dental implants over 5 years after functional loading. The vertical MBL (vMBL) was measured from the implant-abutment junction to the first bone-to-implant contact. The horizontal MBL (hMBL) was measured from the implant-abutment junction to the bone crest. All data were presented as means ± standard errors. Paired and independent -tests with Welch's correction were used to analyze the data. A total of 61 dental implants in 38 patients after 5 years of functional loading were evaluated. Over time, PS dental implants were more likely to gain bone; by contrast, PM dental implants were more likely to lose bone during the observation time. Changes in vMBL for PS dental implants were significantly less than those for PM dental implants at 1-year ( = 0.045), 3-year ( = 0.021), and 5-year ( = 0.010) loading. Likewise, changes in hMBL for PS dental implants were significantly smaller than in those for PM dental implants at 3-year ( = 0.021) and 5-year ( = 0.006) loading; however, the changes were minimal in both approaches. PS dental implants had a significant increment in the percentage of bone integration, whereas that for PM dental implants dropped over time, with no significance. In PS dental implants that occlude with natural teeth, vertical and horizontal bone gain was observed, and it was significant at 3 years ( = 0.023). A significant horizontal bone gain was observed in the opposing natural teeth at 3-year ( = 0.002) and 5-year loading ( = 0.002). The PS concept appears to preserve more MBL around dental implants by stabilizing the vMBL and hMBL over a 5-year period. A minimal marginal bone change was detected in both concepts. The opposing natural teeth at PS dental implants showed a favorable effect on marginal bone tissues.
保留边缘骨水平（MBL）对于牙种植治疗的长期成功至关重要，并且牙种植体周围的骨重塑被认为会随时间变化。众多比较平台转换（PS）和平台匹配（PM）牙种植体的研究表明，PS牙种植体的MBL降低幅度较小，且其中大多数研究的观察期相对较短。本研究旨在通过使用数字化根尖片评估垂直和水平骨缺损，以检查功能加载后5年内PM和PS牙种植体周围MBL的变化。垂直MBL（vMBL）从种植体 - 基台连接处测量至首次骨 - 种植体接触点。水平MBL（hMBL）从种植体 - 基台连接处测量至牙槽嵴顶。所有数据均以均值±标准误表示。采用配对和独立t检验并进行韦尔奇校正来分析数据。对38例患者的61颗牙种植体在功能加载5年后进行了评估。随着时间推移，PS牙种植体更有可能获得骨组织；相比之下，在观察期内PM牙种植体更有可能失去骨组织。在1年（P = 0.045）、3年（P = 0.021）和5年（P = 0.010）加载时，PS牙种植体的vMBL变化明显小于PM牙种植体。同样，在3年（P = 0.021）和5年（P = 0.006）加载时，PS牙种植体的hMBL变化明显小于PM牙种植体；然而，两种方法中的变化都很小。PS牙种植体的骨结合百分比有显著增加，而PM牙种植体的骨结合百分比随时间下降，但无统计学意义。在与天然牙咬合的PS牙种植体中，观察到垂直和水平骨增加，在3年时具有显著性（P = 0.023）。在3年（P = 0.002）和5年加载（P = 0.002）时，对颌天然牙观察到显著的水平骨增加。PS概念似乎通过在5年期间稳定vMBL和hMBL来保留牙种植体周围更多的MBL。在两种概念中均检测到最小的边缘骨变化。PS牙种植体的对颌天然牙对边缘骨组织显示出有利影响。
