Scholarlink

Objectives <p>To develop and validate a new method to acquire reference distances.</p> Materials and methods <p>A method to accurately register the intraoral position of precision balls was developed to generate reference values for the in-vivo assessment of impression accuracy and tested in vitro. Therefore, metal occlusal veneers with a special abutment carrying precision balls were provisionally attached to specific positions on the patient’s dental arch (anatomical model with PMMA covered metal teeth). To register the precision ball positions, form-congruent counterparts were jointed to the abutments, adhesively fixed to a transfer aid, removed and digitized with a laboratory scanner. First, the distance determination using a transfer aid and a laboratory scanner was validated. Second, the process was tested for an anatomic situation.</p> Results <p>When measuring distances using a transfer aid and a laboratory scanner, distances could be detected with an accuracy of less than 5&#xa0;μm. Using the new test setup on the anatomical model, the intraoral scanners more accurately reproduced scan volumes up to one quadrant, with deviations between the actual scan data sets/plaster models and the reference data set of &lt; 52&#xa0;μm for Primescan, &lt; 82&#xa0;μm for Omnicam, and &lt; 125&#xa0;μm for conventional impression. Longer distances tended to be more accurately represented by the conventional impression (Primescan &lt; 304&#xa0;μm; Omnicam &lt; 328&#xa0;μm; conventional impression &lt; 164&#xa0;μm).</p> Conclusions <p>The developed method seems suitable for determining the clinical accuracy of conventional and digital complete arch impressions.</p> Clinical relevance <p>For determining the clinical accuracy of conventional or digital impressions, reference values are crucial.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

In-vitro validation of a new method to assess the clinical accuracy of complete arch impressions

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年2月25日

查看全文
  • Moritz Waldecker,
  • Schessler Katherina,
  • Bömicke Wolfgang,
  • Rammelsberg Peter,
  • Rues Stefan

摘要

Objectives

To develop and validate a new method to acquire reference distances.

Materials and methods

A method to accurately register the intraoral position of precision balls was developed to generate reference values for the in-vivo assessment of impression accuracy and tested in vitro. Therefore, metal occlusal veneers with a special abutment carrying precision balls were provisionally attached to specific positions on the patient’s dental arch (anatomical model with PMMA covered metal teeth). To register the precision ball positions, form-congruent counterparts were jointed to the abutments, adhesively fixed to a transfer aid, removed and digitized with a laboratory scanner. First, the distance determination using a transfer aid and a laboratory scanner was validated. Second, the process was tested for an anatomic situation.

Results

When measuring distances using a transfer aid and a laboratory scanner, distances could be detected with an accuracy of less than 5 μm. Using the new test setup on the anatomical model, the intraoral scanners more accurately reproduced scan volumes up to one quadrant, with deviations between the actual scan data sets/plaster models and the reference data set of < 52 μm for Primescan, < 82 μm for Omnicam, and < 125 μm for conventional impression. Longer distances tended to be more accurately represented by the conventional impression (Primescan < 304 μm; Omnicam < 328 μm; conventional impression < 164 μm).

Conclusions

The developed method seems suitable for determining the clinical accuracy of conventional and digital complete arch impressions.

Clinical relevance

For determining the clinical accuracy of conventional or digital impressions, reference values are crucial.