目的:评估马前和椎弓根植入物周围的骨变化,分析基台高度[短基台(SA<2mm)和长基台(LA>2mm)]以及种植体周围软组织表型的三个组成部分的影响。
方法:26例患者接受了71个植入物,这些植入物是根据肌肉上组织高度(STH)放置的(n=17),浅下顶≈1mm(n=33),或深下壁位置≈2mm(n=21)。经过3个月的愈合,修复是在1.5mm的多单元基台上使用金属陶瓷冠完成的,2.5mm,或3.5mm高,取决于假体空间和STH。纵向临床参数(STH,粘膜厚度,和角化粘膜宽度)和放射学数据[骨重建和边缘骨丢失(MBL)]在术后3、6、12和24个月收集。
结果:在植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入植入。两年后,SA组骨重建的平均变化显著大于LA组.根据多元线性回归,骨重建主要取决于基台高度(β=-0.43),其次是蠕动位置(β=0.34),和角化粘膜宽度(β=-0.22),而MBL取决于桥台高度(β=-0.37),和患者年龄(β=-0.36)。
结论:将植入物放置在胸前或腕下约1mm的位置,LA的骨重塑较少,而MBL的最低水平发生在植入LA的下茎〜2mm植入物中。不同的软组织厚度加上SA或LA的使用在骨重塑和MBL方面产生了显着的组间差异。
结论:基肩高度是影响骨重建和MBL的最有力的预测变量。根据种植体周围软组织表型的尺寸,将植入物置于支架下也可能是减少骨骼重塑的可行选择,因此,减少MBL。
背景:标识号:NCT05670340。
OBJECTIVE: To evaluate the bone changes around equicrestal and subcrestal implants, analyzing the effect of abutment height [short abutments (SA < 2 mm) and long abutments (LA > 2 mm)] and the three components of the peri‑implant soft-tissue phenotype.
METHODS: Twenty-six patients received 71 implants that were placed according to supracrestal tissue height (STH) in an equicrestal (n = 17), shallow subcrestal ≈1 mm (n = 33), or deep subcrestal ≈2 mm (n = 21) position. After 3 months of healing, rehabilitation was completed using metal-ceramic crowns on multi-unit abutments of 1.5 mm, 2.5 mm, or 3.5 mm in height, depending on the prosthetic space and STH. Longitudinal clinical parameters (STH, mucosal thickness, and keratinized mucosa width) and radiographic data [bone remodelling and marginal bone loss (MBL)] were collected at 3, 6, 12, and 24 months postsurgery.
RESULTS: The gain in STH was significantly greater around the implants placed in a subcrestal ≈2 mm position. After 2 years, the mean change in bone remodelling in the SA group was significantly greater than in the LA group. According to the multiple linear regression, bone remodelling depends primarily on abutment height (β = -0.43), followed by crestal position (β = 0.34), and keratinized mucosa width (β = -0.22), while MBL depends on abutment height (β = -0.37), and the patient\'s age (β = -0.36).
CONCLUSIONS: Implants placed in an equicrestal or subcrestal ≈1 mm position with LA undergo less bone remodelling, while the lowest level of MBL occurs in subcrestal ≈2 mm implants with LA. Differing soft-tissue thicknesses combined with the use of either SA or LA produced significant intergroup differences in bone remodelling and MBL.
CONCLUSIONS: Abutment height is the most powerful predictor variable affecting bone remodelling and MBL. Depending on the dimensions of the peri‑implant soft-tissue phenotype, placing the implants subcrestally may also be a viable option to decrease bone remodelling and, consequently, reduce MBL.
BACKGROUND: identification number: NCT05670340.