Comparing the fitness of removable partial dentures fabricated using different digital and conventional impressions (In vitro study on the degree of adaptation of rests)

Document Type : Original Article

Author

lecturer in Prosthodontic department, college of dentistry, Arab Academy for Science and technology

10.21608/edj.2025.408534.3572

Abstract

Purpose:
Comparing the fitness of removable partial dentures (RPD) fabricated using different digital and conventional impressions regarding degree of rest adaptation
Materials and methods:
Using different ways for recording impression (digital and conventional) for fabricating a simplified metallic structure of RPD devoid of clasps for a partially edentulous Class II modification 1 Kennedy classification where clinical case was simulated on a dental Reference model. The maxillary partially edentulous arch had two prosthetic spaces, one bounded saddle between two abutment teeth, right maxillary cuspid and right maxillary second molar and a distal extension base with left maxillary second bicuspid as abutment.
Then evaluating the degree of fitness for rests on rest seat by recording number of perforations in silicon between rests and rest seats in different positions and measuring thickness of silicone using stereomicroscope.
Results and conclusion:
It was concluded that the two digital impression techniques showed better results regarding the degree of adaptation of the rests. These results were not significant to the extent the to consider impression technique as a factor that influences the adaptation of occlusal and cingulum rests at different measurement points.

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Egyptian Dental Journal
Volume 71, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2025
Pages 3363-3369

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