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首页> 外文期刊>The Journal of Prosthetic Dentistry >Accuracy of implant placement using precision surgical guides with varying occlusogingival heights: an in vitro study.
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Accuracy of implant placement using precision surgical guides with varying occlusogingival heights: an in vitro study.

机译：使用具有不同咬合牙龈高度的精密手术导向器进行植入物植入的准确性：一项体外研究。

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STATEMENT OF PROBLEM: Surgical guides may interfere with effective use of surgical instrumentation during implant placement in the posterior segments where interocclusal distance may be limited. PURPOSE: The purpose of this study was to measure and compare the accuracy of posterior implant placement using 3 precision surgical guides with varying occlusogingival heights, and to evaluate the difference in accuracy of implant placement through precision guides as compared to freehand placement. MATERIAL AND METHODS: Three groups of surgical guides were fabricated with occlusogingival heights of 4, 6, and 8 mm, respectively. A jig was fabricated to allow for accurate positioning in bone substitute blocks. Ninety implants were placed in the mandibular first molar site on a manikin. Thirty implants (Astra Tech AB) were placed for each group, with 15 through the guide and 15 freehand. Distances between a reference implant and each placed implant were measured at both implant and abutment levels using a coordinate measuring machine. Apex position and angular discrepancy were calculated using the coordinates of the centers of the implant platform and of the occlusal aspect of the abutment. Data was assessed using 2-way ANOVA (alpha=.05). RESULTS: Two-way ANOVA demonstrated that guide height did not significantly affect the accuracy of the implant position. The distance from the reference point to the point of measurement was significantly smaller for placement through the guide compared to freehand placement at both implant (P<.001) and abutment levels (P<.001). The angular discrepancy was also significantly smaller for placement through the guide (P<.001). CONCLUSIONS: Precision surgical guides with 4-mm occlusogingival height allow placement as accurate as precision guides with 8-mm height. Placement through the guide reproduced the target position more accurately than freehand insertion.
机译：问题陈述：在植入物放置在可能限制咬合间距离的后段期间，手术指南可能会干扰手术器械的有效使用。目的：本研究的目的是使用3个不同的咬合龈高度的精密外科手术指南来测量和比较后种植体植入的准确性，并评估与徒手放置相比，通过精密指南对植入物放置准确性的差异。材料与方法：制作三组手术导板，其咬合龈高度分别为4、6和8 mm。制造了一个夹具，以允许在骨替代块中精确定位。将九十个植入物放置在人体模型的下颌第一磨牙部位。每组放置30个植入物（Astra Tech AB），其中15个通过引导器，15个徒手。使用坐标测量机在参考种植体和每个放置的种植体之间的距离在种植体和基台水平上进行测量。使用种植体平台中心和基台咬合方面的坐标计算顶点位置和角度差异。使用2-方差分析（α= .05）评估数据。结果：双向方差分析表明，引导高度不会显着影响植入物位置的准确性。通过参考线放置时，从参考点到测量点的距离明显小于在种植体（P <.001）和基台（P <.001）上的徒手放置。通过导板放置时，角度差异也明显较小（P <.001）。结论：咬合牙龈高度为4毫米的精密外科手术导向器可以与8毫米高度的精密导向器一样精确地放置。通过指南放置比手动插入更准确地再现了目标位置。

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