NONE 20260408061129030 wseas/wseas content-registration-form+ja@crossref.org content-registration-form International Journal of Applied Sciences & Development 2945-0454 Laith Mahmoud Abdulhadi Al-samawi Department of Prosthetic Dentistry Mahsa University Jalan SP 2, Bandar Saujana Putra, Selangor MALAYSIA The limitations of the undercut measuring gauge found in dental surveyors restrict precise positioning of the retentive arm of a clasp from its initial contact with the tooth surface above the survey line (suprabulge area) to its final resting position in the undercut area. Presently, the available dental surveyors feature three distinct measuring undercut gauges specifically designed to assess only the depth of the infrabulge area. There is a clear necessity for new gauges that can assess both the undercut depth areas and the suprabulge areas, as this would be crucial for accurately marking the action zone of the retentive arm and the reciprocal action zones to counteract the spring-action mechanism of the retentive arm, thereby reducing the torque on the abutment during the placement and removal of removable partial dentures, as well as during various oral functions. A device with a simple design, consisting of a metal disc whose diameter matches each of the three standard gauge measures (0.25, 0.5, and 0.75 mm), is proposed. This device can be easily made to determine the clasp's activation zone. It is suitable for all types of dental surveyors. 04 08 2026 04 08 2026 41 5 https://creativecommons.org/licenses/by/4.0/deed.en_US 10.37394/232029.2026.5.5 https://wseas.com/journals/asd/2026/a10asd-005(2026).pdf Lejoyeux J., Traitement de l'édentation partielle et totale : prothèse amovible, Maloine, 1980. Abdulhadi LM, Designing Removable Partial Denture According to Bioprotective Principles (Reka Bentuk Dentur Sebahagian Boleh Tanggal Prinsip Bioperlindungan), PBM, 2015 Alan B.C, David T.B., Mccracken's Removable Partial Prosthodontic, Elsevier-Mosby, 2012 Davenport JC., Basker RM., Heath JR., Ralph JP., Glantz PO., Surveying, British Dental Journal, Vol.189, 2000, pp.532-542. Al-Samawi LMA., Studying the Impact of Certain Variables of the Aker Clasp on Its Retentive Force on Selected Maxillary Teeth, International Journal of Applied Sciences & Development, Vol.4, 2025, pp. 254-256. Salazar D.H.R, Honnlee S., Liu Z-J., Tongue, Palatal, Hyoid and Pharyngeal Muscle Activity during Chewing, Swallowing, and Respiration, Archives of Oral Biology, Vol. 7, 2023, No.157, pp.105845. Brockhurst PJ., A New Design for Partial Denture Circumferential Clasp Arms, Australian Dental Journal, Vol.41, 1996, pp. 317-23. Al-Samawi L.M.A., Daboul A., Stress Distribution by Improved Designs of Obturator Frameworks Using Photo-elastic Resin Models. In Vitro Study, Wseas Transactions on Biology and Biomedicine, Vol.20, 202, pp.1-11 Sato Y., Yuasa Y., Akagawa Y., Ohkawa S., An Investigation of Preferable Taper and Thickness Ratios for Cast Circumferential Clasp Arms Using Finite Element Analysis, International Journal of Prosthodontics, Vol.8, No.8, 1995, pp.392-7. Sato Y., Abe Y., Yuasa Y., Akagawa Y., Effect of Friction Coefficient On Akers Clasp Retention. Journal of Prosthetic Dentistry. Vol. 78,1997, pp. 22-7. Arthur M., LaVere, Clasp Retention: The Effects of Five Variables, Journal of Prosthodontics, Vol.2, No. 2, 1993, pp.126- 131. Roach FE., Principles and Essentials of Bar Clasp/Partial Dentures. Journal of American Dental Association, Vol.17, 1930, pp.124–138. Al-Samawi LMA., A Mathematical method for Calculating the Retentive Force of Ring Clasps when Designing the Removable Partial Denture Metal Frame, Wseas Transactions on Applied and Theoretical Mechanics, Vol.18, 2023, pp. 221-228.