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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (2): 406-412. doi: 10.19723/j.issn.1671-167X.2021.02.029

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Evaluation of methods for fitness of removable partial denture

YOON Jung-min1,WANG Zi-xuan1,CHAN Chon-kai1,SUN Yu-chun2,LIU Yun-song1,YE Hong-qiang1,Δ(),ZHOU Yong-sheng1,Δ()   

  1. 1. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
    2. Center for Digital Dentistry, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China
  • Received:2019-04-04 Online:2021-04-18 Published:2021-04-21
  • Contact: Hong-qiang YE,Yong-sheng ZHOU E-mail:yhqfy@163.com;zhouysh72@163.com
  • Supported by:
    Capital’s Funds for Health Improvement and Research(首发 2018-2-4101);National Natural Science Foundation of China(81801015);New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology(PKUSSNCT-17A03)

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Abstract:

Objective: To compare the differences and indications of three evaluation methods for fitness evaluation of removable partial denture (RPD). Methods: A RPD was fabricated and seated on the stone cast of a partially edentulous mandible, and the spaces between RPD and stone cast were recorded with polyvinyl siloxane (PVS) impression material forming PVS replicas. Using cross sectional measurement, the average thicknesses of PVS replicas were measured under stereomicroscope with different numbers of selected measuring points in the denture base, major connector, occlusal rest of the RPD, and the average thicknesses of the PVS replicas measured with different numbers of measuring points were compared using one-way analysis of variance (ANOVA) and independent sample t test. Three kinds of method, including cross sectional measurement, three-dimensional analysis on the stone cast, and three-dimensional analysis on the polyether cast, were applied to measure the average thicknesses of the PVS replicas, and the average thicknesses of the PVS replicas measured by these three evaluation methods were compared with ANOVA. Results: For cross sectional measurement, statistically significant differences were found in the average thicknesses of the PVS replicas in the denture base and the major connector among the different numbers of measuring points (P<0.05), but no differences were found in the average thicknesses of the PVS replicas in the occlusal rest (P>0.05). There were significant differences among the average thicknesses of the PVS replicas measured by these three evaluation methods in each component of the RPD (P<0.01). The average thickness measured by three-dimensional analysis on the stone cast and three-dimensional analysis on polyether cast were smaller than that measured by cross sectional measurement (P<0.05). And there were no differences between the average thicknesses of PVS replicas measured by three-dimensional analysis on stone cast and three-dimensional analysis on polyether cast (P>0.05). Conclusion: For cross sectional measurement, the average thickness of the PVS replicas was influenced by the number of measuring points, and the measurement accuracy of cross sectional measurement was not reliable enough. Three-dimensional analysis on stone cast which is suitable for evaluation in vitro and three-dimensional analysis on polyether cast which is suitable for evaluation in vivo can evaluate the fitness of RPD more comprehensively and effectively than that of cross sectional measurement.

Key words: Removable partial denture, Digital, Fit

CLC Number: 

  • R783.4

Figure 1

Fabrication of polyvinyl siloxane replica specimen"

Figure 2

Schematic diagram of different numbers of measuring points on polyvinyl siloxane replicas A,measured points on polyvinyl siloxane replicas of denture base;B,measured points on polyvinyl siloxane replicas of major connecter;C,measured points on polyvinyl siloxane replicas of occlusal rest."

Figure 3

Thickness measurement of polyvinyl siloxane replica under stereomicroscope"

Figure 4

Three-dimensional analysis on stone cast A,polyvinyl siloxane replica on stone cast;B,3D color-coded map showing thickness of polyvinyl siloxane replica."

Figure 5

Three-dimensional analysis on polyether cast A, alginate impression of removable partial denture with polyvinyl siloxane replica; B, polyvinyl siloxane replica on polyether cast after removing alginate impression; C, fixed polyether cast on a registration frame; D, 3D color-coded map showing thickness of polyvinyl siloxane replica."

Table 1

Thickness of polyvinyl siloxane replica on denture bases measured with different numbers of measuring points ($\bar{x} \pm s$, /μm)"

Items 6 equal parts (15 MP) 3 equal parts (6 MP) 2 equal parts (3 MP) P
Denture base 302.4±56.8* 301.7±54.2* 254.8±51.5 0.030
Extension denture base 240.8±36.2 208.1±43.1# 203.1±42.7# 0.031
Non-extensive denture base 364.0±92.1* 395.4±94.2* 286.8±88.1 0.007

Table 2

Thickness of polyvinyl siloxane replica on major connector and occlusal rests with different numbers of measuring points($\bar{x} \pm s$, /μm)"

Items 8 equal parts 4 equal parts 2 equal parts P
Major connector 130.0±40.6* 130.5±41.4* 96.5±41.0 0.043
44 occlusal rest 246.7±56.0 227.2±58.3 0.843
47 occlusal rest 325.9±112.6 359.6±154.4 0.360
35 occlusal rest 244.4±71.2 230.3±72.3 0.805
Occlusal rest total 272.3±63.8 272.4±74.7 0.562

Table 3

Thicknesses of polyvinyl siloxane replicas measured by three methods in each component of removable partial denture ($\bar{x} \pm s$, /μm)"

Items CSM group TAS group TAP group P
Denture base 302.4±56.8 179.7±39.9* 173.3±24.5* <0.001
Major connector 130.0±40.6 61.9±28.4* 81.9±37.7* <0.001
Occlusal rest 272.3±63.8 159.5±44.1* 162.9±32.7* <0.001
Total 234.9±44.3 166.1±36.6* 168.1±22.1* <0.001
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