Perelli Michele, Abundo Roberto, Corrente Giuseppe, Saccone Carlo, Arduino Paolo G
Private Practice, Turin, Italy.
CIR-Dental School, Department of Surgical Sciences, University of Turin, Turin, Italy.
Case Rep Dent. 2017;2017:7829179. doi: 10.1155/2017/7829179. Epub 2017 Dec 18.
Tooth extraction is usually followed by bone reduction. In the maxillary posterior region, this remodelling combined with sinus pneumatisation and periodontal defects may lead to a reduced basal bone height available for implant placement. Sinus floor elevation can be performed with different surgical techniques. Crestal approach has demonstrated to be effective, less invasive, and associated with a reduced morbidity. This article reports a modified sinus floor elevation by means of rotary, noncutting instruments, addition of xenograft, and 2 short-threaded implant placements. The aim of the study was to evaluate the implant's success and intrasinus radiographical bone gain after 4 years of functional loading. The premolar implant site presented a starting basal bone height of 6 mm, while the molar site was of 2 mm. In the first surgical step, sinus floor elevation was performed mesially and the implant was inserted, and distally only sinus floor elevation was performed. After 6 months, the mesial implant was uncovered and the second implant was inserted; 4 months later, the second fixture was uncovered, and both fixtures were loaded with single provisional screw-retained crowns and later with single screw-retained porcelain fused to metal crowns. Implants integrated successfully, and crestal bone remodelling did not exceed the smooth collar. Bone gain was 3 mm for the mesial implant and more than 5 mm for the distal one.
拔牙后通常会出现骨量减少。在上颌后牙区，这种重塑加上鼻窦气化和牙周缺损可能导致可用于种植体植入的基骨高度降低。鼻窦底提升可以通过不同的手术技术来进行。牙槽嵴顶入路已被证明是有效的，侵入性较小，且发病率较低。本文报道了一种通过旋转非切割器械、添加异种骨移植材料以及植入两颗短螺纹种植体来改良鼻窦底提升术。本研究的目的是评估在功能负载4年后种植体的成功率以及鼻窦内的影像学骨增量。前磨牙种植位点的起始基骨高度为6毫米，而磨牙位点为2毫米。在第一步手术中，在近中进行鼻窦底提升并植入种植体，在远中仅进行鼻窦底提升。6个月后，暴露近中种植体并植入第二颗种植体；4个月后，暴露第二颗种植体，两颗种植体均安装单个临时螺丝固位冠，随后安装单个螺丝固位的烤瓷熔附金属冠。种植体成功整合，牙槽嵴顶骨重塑未超过光滑颈部。近中种植体的骨增量为3毫米，远中种植体的骨增量超过5毫米。
