Development of a retention force measuring system for removable partial denture clasps and preliminary evaluation of its effects

doi:10.3877/cma.j.issn.1674-1366.2023.03.007

Chinese Journal of Stomatological Research(Electronic Edition) ›› 2023, Vol. 17 ›› Issue (03): 197-202. doi: 10.3877/cma.j.issn.1674-1366.2023.03.007

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Development of a retention force measuring system for removable partial denture clasps and preliminary evaluation of its effects

Dongyi Wang¹, Yun Dai¹, Xinping Yin², Jiali Meng³, Guofeng Wu⁴^,^†()

^1. Department of Prosthodontics, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing 210008, China
^2. Department of Stomatology, the Fifth Affiliated Hospital of Southern Medical University, Guangzhou 510920, China
^3. Stomatological Digital Engineering Center, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing 210008, China
^4. Department of Prosthodontics, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing 210008, China; Stomatological Digital Engineering Center, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing 210008, China

Received:2022-10-20 Online:2023-02-21 Published:2023-06-02
Contact: Guofeng Wu
Supported by:
Open Project of Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health(PKUSS20200501); "3456" Cultivation Program For Junior Talents of Nanjing Stomatological School, Medical School of Nanjing University(0222C117)

Abstract

Abstract:

Objective

This study was to develop a retention force measuring system and evaluate its performance.

Methods

A retention force measuring system was designed with three parts: retention force measuring instrument, clamp dynamometer, and retention force measuring software system. Main indicators included the measuring range from 0 to 50 N and the continuous measurement which collected 1 000 valid data per second. Then accuracy measurement experiment of the system was conducted using weights. Next, 12 CoCr and 12 CP-titanium clasps fabricated by additive manufacturing. The clasps made from the same material were labeled from 1 to 12, and 12 corresponding random numbers were generated and sorted in a descending order using Excel software. The first six clasps in the list were to form a group. The clasps of each material were divided into two groups (n = 6) , and their initial retention forces were measured using two methods. The obtained results were statistically analyzed using SPSS 18.0. One-Way ANOVA was used to compare the system precision, and independent sample t-test was performed to compare the initial retention force of denture clasps obtained by different measurement methods.

Results

The accuracy of the developed retention force measurement system complied with the design requirements. There was significant difference in the initial retention forces of clasps between the universal material testing machine [CP-titanium: (13.96 ± 1.51) N, CoCr: (18.93 ± 1.42) N] and the retention force measurement system [CP-titanium: (10.35 ± 0.75) N, CoCr: (15.34 ± 0.68) N] (t_CPTi = -11.740, P_CPTi<0.001; t_CoCr = -12.492, P_CoCr<0.001) .

Conclusion

The measurement system developed in this study revealed a more reliable retention force change in the process of clasp dislocation, which was closer to the clinical situation.

Key words: Denture, partial, removable, Dental prosthesis retention, Dental clasp

Dongyi Wang, Yun Dai, Xinping Yin, Jiali Meng, Guofeng Wu. Development of a retention force measuring system for removable partial denture clasps and preliminary evaluation of its effects[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2023, 17(03): 197-202.

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Figures/Tables 7

References 20

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