Journals / Aydın Dental Journal / 2026 / Cilt: 12 Sayı: 2

Trueness and Precision of Conventional vs Digital Impressions in a Kennedy Class III Case

Kennedy Sınıf III Bir Olguda Konvansiyonel ve Dijital Ölçü Yöntemlerinin Doğruluk ve Hassasiyetlerinin Değerlendirilmesi

Dila Polat(İSTANBUL ÜNİVERSİTESİ, DİŞ HEKİMLİĞİ FAKÜLTESİ)0009-0001-4844-6664
Alper Aktosun(İSTANBUL ÜNİVERSİTESİ, DİŞ HEKİMLİĞİ FAKÜLTESİ)0009-0005-3732-3297
Sina Saygılı(İSTANBUL ÜNİVERSİTESİ, DİŞ HEKİMLİĞİ FAKÜLTESİ)0000-0001-9411-0507
Tonguç Sülün(İSTANBUL ÜNİVERSİTESİ, DİŞ HEKİMLİĞİ FAKÜLTESİ)0000-0001-5518-7915
Pages
123–131
Publication Date
2026-08-29
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Conclusion: The digital method demonstrated trueness comparable to conventional techniques in the edentulous area and superior precision in most regions, supporting its use for Kennedy Class III removable prosthodontic applications despite reduced trueness in tooth-bearing and whole-arch regions.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Objectives: This study compared the trueness and precision of conventional alginate impressions (metal tray and custom tray) and a digital impression method in a Kennedy Class III partially edentulous model.
📊
Key Findings & Data:Materials and Methods: A reference model was obtained from a polyether impression and Type III stone cast and scanned to generate reference STL data.
💡
Conclusion & Impact:Conclusion: The digital method demonstrated trueness comparable to conventional techniques in the edentulous area and superior precision in most regions, supporting its use for Kennedy Class III removable prosthodontic applications despite reduced trueness in tooth-bearing and whole-arch regions.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Protetik diş tedavisi · Sonuçların tekrarlanabilirliği · Üç boyutlu görüntüleme

Abstract

Objectives: This study compared the trueness and precision of conventional alginate impressions (metal tray and custom tray) and a digital impression method in a Kennedy Class III partially edentulous model. Materials and Methods: A reference model was obtained from a polyether impression and Type III stone cast and scanned to generate reference STL data. Thirty-six impressions were allocated to three groups (n=12): metal tray alginate, custom tray alginate, and digital intraoral scanning. Test STL files were superimposed onto the reference STL, and RMS deviations were calculated for the edentulous area, teeth, palate, and whole arch. Trueness was defined as deviation from the reference model, and precision as within-group repeatability. Data were analyzed using Welch ANOVA/Games-Howell or Kruskal-Wallis/Dunn tests (α=0.05). Results: No significant difference in trueness was found for the edentulous area (P=0.077). Significant differences were observed for teeth (P<0.001), palate (P=0.029), and whole arch (P=0.011); the digital method showed the highest deviations for teeth and whole arch but the lowest for the palate. For precision, the digital method showed significantly lower deviations in the edentulous area (P=0.004), teeth (P<0.001), and palate (P=0.046), while no difference was found for the whole arch (P=0.172). Conclusion: The digital method demonstrated trueness comparable to conventional techniques in the edentulous area and superior precision in most regions, supporting its use for Kennedy Class III removable prosthodontic applications despite reduced trueness in tooth-bearing and whole-arch regions.

Özet

Amaç: Bu çalışmanın amacı, Kennedy Sınıf III bir modelde konvansiyonel aljinat ölçü yöntemlerinin (prefabrik kaşık ve bireysel kaşık) ve dijital ölçü yönteminin doğruluk ve hassasiyetini karşılaştırmalı olarak değerlendirmektir. Gereç ve Yöntemler: Referans model, polieter ölçü ve Tip III alçı kullanılarak elde edilmiş ve referans STL verisi oluşturmak amacıyla taranmıştır. Otuz altı ölçü üç gruba ayrılmıştır (n=12): prefabrik kaşık ile aljinat ölçü, bireysel kaşık ile aljinat ölçü ve ağız içi tarayıcı ile dijital ölçü. Test STL verileri referans STL verisi ile çakıştırılmış ve dişsiz bölge, dişler, damak ve tüm ark için RMS sapmaları hesaplanmıştır. Doğruluk, referans modele göre sapma; hassasiyet ise grup içi tekrarlanabilirlik olarak tanımlanmıştır. Veriler Welch ANOVA/Games-Howell veya Kruskal-Wallis/Dunn testleri ile analiz edilmiştir (α=0,05). Bulgular: Dişsiz bölgede doğruluk açısından anlamlı fark bulunmamıştır (P=0,077). Dişler (P<0,001), damak (P=0,029) ve tüm ark (P=0,011) için anlamlı farklılıklar saptanmıştır; dijital yöntem dişler ve tüm arkta en yüksek, damakta ise en düşük sapmayı göstermiştir. Hassasiyet açısından dijital yöntem dişsiz bölgede (P=0,004), dişlerde (P<0,001) ve damakta (P=0,046) anlamlı derecede daha düşük sapma göstermiş, tüm arkta ise anlamlı fark bulunmamıştır (P=0,172). Sonuç: Dijital yöntem, dişsiz bölgede konvansiyonel yöntemlerle benzer doğruluk ve çoğu bölgede üstün hassasiyet göstermiştir. Bu bulgular, Kennedy Sınıf III hareketli protez vakalarında dijital ölçülerin kullanılabileceğini desteklemektedir. Ancak dişler bölgesinde ve tüm ark değerlendirmesinde gözlenen daha yüksek sapmalar, tarama ve görüntü birleştirme süreçlerinin genel doğruluğu sınırlayabileceğini düşündürmektedir.

🔖

Cite This Article

Polat, D., Aktosun, A., Saygılı, S., Sülün, T. (2026). Trueness and Precision of Conventional vs Digital Impressions in a Kennedy Class III Case. Aydın Dental Journal, Cilt: 12 Sayı: 2, 123–131. https://ajindex.com/articles/1458358

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (24)

  1. Ahmed S, Hawsah A, Rustom R, Alamri A, Althomairy S, Alenezi M, et al. Digital impressions versus conventional impressions in prosthodontics: a systematic review. Cureus. 2024;16(1):e51537.
  2. Park JS, Alshehri YFA, Kruger E, Villata L. Accuracy of digital versus conventional implant impressions in partially dentate patients: A systematic review and meta-analysis. J Dent. 2025;160:105918.
  3. Rosenstiel S, Land M, Fujimoto J. Contemporary fixed prosthodontics. 5th ed. St. Louis (MO): Elsevier; 2016.
  4. Carr AB, Brown DT. McCracken's removable partial prosthodontics. 13th ed. St. Louis (MO): Elsevier; 2016.
  5. Phoenix R, Cagna D, DeFreest C. Stewart's clinical removable partial prosthodontics. 4th ed. Chicago: Quintessence Publishing; 2008.
  6. Kennedy E. Partial denture construction. 2nd ed. Brooklyn: Dental Items of Interest Publishing Co; 1942.
  7. Applegate O. Essentials of removable partial denture prosthesis. 3rd ed. Philadelphia: Saunders; 1965.
  8. Husein HA, Morad ML, Kanout S. Accuracy of conventional and digital methods of obtaining full-arch dental impression (in vitro study). Cureus. 2022;14(9):e29055.
  9. Anusavice K, Shen C, Rawls H. Phillips' science of dental materials. 12th ed. St. Louis, MO: Elsevier; 2013.
  10. Chochlidakis KM, Papaspyridakos P, Geminiani A, Chen CJ, Feng IJ, Ercoli C. Digital versus conventional impressions for fixed prosthodontics: A systematic review and metaanalysis. J Prosthet Dent. 2016;116:184-90.
  11. Donovan TE, Chee WW. A review of contemporary impression materials and techniques. Dent Clin North Am. 2004;48:445-70.
  12. Kaitatzidou A, Chalazoniti A, Faggion CM, Bakopoulou A, Barbosa-Liz DM, Giannakopoulos NN. Digital scans versus conventional impressions in fixed prosthodontics: An overview of systematic reviews. J Prosthet Dent. 2025;134(6):2156-64.
  13. Mangano F, Gandolfi A, Luongo G, Logozzo S. Intraoral scanners in dentistry: a review of the current literature. BMC Oral Health. 2017;17:149.
  14. Ahlholm P, Sipilä K, Vallittu P, Jakonen M, Kotiranta U. Digital versus conventional impressions in fixed prosthodontics: a review. J Prosthodont. 2018;27:35-41.
  15. Ender A, Mehl A. Accuracy of complete-arch dental impressions: a new method of measuring trueness and precision. J Prosthet Dent. 2013;109:121-8.
  16. Hayama H, Fueki K, Wadachi J, Wakabayashi N. Trueness and precision of digital impressions obtained using an intraoral scanner with different head size in the partially edentulous mandible. J Prosthodont Res. 2018;62:347-52.
  17. Diker B, Tak Ö. Accuracy of digital impressions obtained using six intraoral scanners in partially edentulous dentitions and the effect of scanning sequence. Int J Prosthodont. 2021;34:101-8.
  18. Lee JH, Yun JH, Han JS, Yeo IL, Yoon HI. Repeatability of intraoral scanners for complete arch scan of partially edentulous dentitions: an in vitro study. J Clin Med. 2019;8(8):1187.
  19. Papaspyridakos P, Vazouras K, Chen YW, Kotina E, Natto Z, Kang K, et al. Digital vs conventional implant impressions: a systematic review and meta-analysis. J Prosthodont. 2020;29:660-78.
  20. Schimmel M, Akino N, Srinivasan M, Wittneben JG, Yilmaz B, Abou-Ayash S. Accuracy of intraoral scanning in completely and partially edentulous maxillary and mandibular jaws: an in vitro analysis. Clin Oral Investig. 2021;25(4):1839-47.
  21. Frank RP, Thielke SM, Johnson GH. The influence of tray type and other variables on the palatal depth of casts made from irreversible hydrocolloid impressions. J Prosthet Dent. 2002;87:15-22.
  22. Yao M, Gan N, Ming J, Cheng H, Jiao T. In vivo study of intraoral scanner trueness in partial edentulism. Sci Rep. 2025;15(1):20637.
  23. Alfaraj A, Khanlar LN, Lin WS, Zandinejad A. Exploring the impact of the extent of the partially edentulous area on the accuracy of two intraoral scanners. J Prosthet Dent. 2024;131(1):163.e1-e8.
  24. Garrofé AB, Ferrari BA, Picca M, Kaplan AE. Linear Dimensional Stability of Irreversible Hydrocolloid Materials Over Time. Acta Odontol Latinoam. 2015;28(3):258-62.