Morphological Comparison of Residual Ridge in Impression for Removable Partial Denture between Digital and Conventional Techniques: A Preliminary In-Vivo Study

Author:

Ishioka Yurika1,Wada Junichiro12ORCID,Kim Eung-Yeol1,Sakamoto Kazuki1,Arai Yuki13,Murakami Natsuko1ORCID,Yamazaki Toshiki1,Takakusaki Kensuke1,Hayama Hironari1,Utsumi Miona1,Inukai Shusuke1,Wakabayashi Noriyuki1

Affiliation:

1. Department of Advanced Prosthodontics, Tokyo Medical and Dental University—TMDU, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8510, Japan

2. Department of Biomaterials Science, Turku Clinical Biomaterials Centre—TCBC, Institute of Dentistry, University of Turku, Itäinen Pitkäkatu 4B, 20520 Turku, Finland

3. Department of Orthodontics, School of Dentistry, University of Texas Health Science Center at Houston, 7500 Cambridge St., Houston, TX 77054, USA

Abstract

Although digital impression using an intraoral scanner (IOS) has been applied for removable partial denture (RPD) fabrication, it is still unclear how the morphology of a residual ridge recorded by digital impression would differ from that recorded by conventional impression. This in vivo study investigated the morphological difference in the recorded residual ridge between digital and conventional impressions. Vertical and horizontal displacements (VD and HD) in residual ridges recorded by digital and conventional impressions were assessed in 22 participants (15 female; mean age 78.2 years) based on the morphology of the tissue surface of in-use RPD. Additionally, the mucosal thickness of the residual ridge was recorded using an ultrasound diagnostic device. VD and HD were compared using the Wilcoxon signed-rank test, and the correlation of mucosal thickness with VD and HD was analyzed using Spearman’s ρ. The VD of digital impression was significantly greater than that of a conventional impression (p = 0.031), while no significant difference was found in HD (p = 0.322). Meanwhile, the mucosal thickness showed no significant correlation with the recorded morphology of the residual ridge, regardless of the impression techniques. It was concluded that the digital impression would result in a greater displacement in the height of the residual ridge from the morphology of in-use RPD than the conventional impression.

Funder

Japan Society for the Promotion of Science

Publisher

MDPI AG

Subject

General Medicine

Reference19 articles.

1. Virard, F., Venet, L., Richert, R., Pfeffer, D., Viguié, G., Bienfait, A., Farges, J.C., and Ducret, M. (2018). Manufacturing of an immediate removable partial denture with an intraoral scanner and CAD-CAM technology: A case report. BMC Oral Health, 18.

2. Novel fully digital workflow for removable partial denture fabrication;Nishiyama;J. Prosthodont. Res.,2020

3. Phoenix, R.D., Cagna, D.R., and DeFreest, C.F. (2008). Stewart’s Clinical Removable Partial Prosthodontics, Quintessence Publishing Co.. [4th ed.].

4. (2023, November 09). Dental Impression Materials, Available online: https://www.ncbi.nlm.nih.gov/books/NBK574496/.

5. A systematic review of digital removable partial dentures. Part I: Clinical evidence, digital impression, and maxillomandibular relationship record;Fueki;J. Prosthodont. Res.,2020

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