Moenning J E, Wolford L M
Int J Adult Orthodon Orthognath Surg. 1989;4(3):175-87.
This retrospective study of 62 patients compared three alloplastic materials used in chin augmentation: Proplast I (PI), Proplast II (PII), and porous block hydroxyapatite (PBHA). There were 25 patients with PI implants (average follow-up of 44.8 months), 25 patients with PII implants (average follow-up of 32.8 months), and 12 patients with PBHA implants (average followup of 19.1 months). Average bone resorption was 1.25 mm (range 0.00 to 3.30 mm) beneath the PI and PII implants and 0.00 mm beneath the PBHA implants. Average posterior settling was 0.46 mm (range 0.00 to 2.00 mm) for the PI and PII implants and 0.03 mm (range 0.00 to 0.17 mm) for the PBHA implants. The percentage of soft tissue change at pagonion relative to the size of the implant was 83.0% (range 66.7% to 100.0%) for PI and PII and 86.8% (range 77.3% to 100.0%) for the PBHA implants. When PI or PII implants were used, younger patients had more resorption than older patients. Slightly more resorption was found with PI and PII implants when maxillary surgery was performed. The size of the PI or PII implants made no difference in the amount of bone resorption, although there was slightly less soft tissue change when larger implants were used. Males had slightly more bone resorption than did females. The bone resorption beneath the PI and PII implants occurred within the first 12 months postsurgery. It can be concluded from this study that PI and PII implants are acceptable materials for chin implants, but some resorption can be expected during the first 12 months postsurgery. The absence of detectable resorption and the excellent soft tissue change make PBHA an attractive alternative as a chin implant material, although it is technically more difficult to use.
这项对62例患者的回顾性研究比较了用于隆颏的三种异体材料：普罗斯特I（PI）、普罗斯特II（PII）和多孔块状羟基磷灰石（PBHA）。25例患者植入PI，平均随访44.8个月；25例患者植入PII，平均随访32.8个月；12例患者植入PBHA，平均随访19.1个月。PI和PII植入物下方的平均骨吸收为1.25毫米（范围0.00至3.30毫米），PBHA植入物下方为0.00毫米。PI和PII植入物的平均向后沉降为0.46毫米（范围0.00至2.00毫米），PBHA植入物为0.03毫米（范围0.00至0.17毫米）。PI和PII在颏角处软组织变化相对于植入物大小的百分比为83.0%（范围66.7%至100.0%），PBHA植入物为86.8%（范围77.3%至100.0%）。使用PI或PII植入物时，年轻患者比老年患者的吸收更多。进行上颌手术时，PI和PII植入物的吸收略多。PI或PII植入物的大小对骨吸收量没有影响，尽管使用较大植入物时软组织变化略少。男性的骨吸收略多于女性。PI和PII植入物下方的骨吸收发生在术后12个月内。从这项研究可以得出结论，PI和PII植入物是隆颏的可接受材料，但术后12个月内可能会有一些吸收。PBHA作为隆颏植入材料，虽然技术上使用更困难，但没有可检测到的吸收且软组织变化良好，是一种有吸引力的替代材料。
