Title
Evaluation of compressive strength and dimensional stability in recycled Type III dental stone mixtures: An in vitro study
Authors
Devupalli Sudha Madhuri, Gujjalapudi Mahalakshmi, Nibha Kumari Singh*, Sabakousar Patil, Anjaneyulu Gasthi & Udayagiri Madhusudhana Rao
Affiliation
Department of Prosthodontics and crown and Bridge Government Dental College and Hospital, Kadapa, Andhra Pradesh, India; *Corresponding author
Devupalli Sudha Madhuri - E-mail: sudhamadhuridevupalli75@gmail.com
Gujjalapudi Mahalakshmi - E-mail: dr.gmahalakshmi@gmail.com
Nibha Kumari Singh - E-mail: drnibhaksingh@gmail.com
Sabakousar Patil - E-mail: sabakousarpatil@gmail.com
Anjaneyulu Gasthi - E-mail: anjimds@gmail.com
Udayagiri Madhusudhana Rao - E-mail: madhu.6c999@gmail.com
Article Type
Research Article
Date
Received July 1, 2026; Revised July 31,
2026; Accepted July 31, 2026, Published July 31, 2026
Abstract
The reuse of dental stone is important for cost reduction and sustainability, but its effect on material properties remains unclear. Therefore, it is of interest to evaluate the compressive strength and dimensional stability of recycled Type III dental stone and its mixtures with standard dental stone in different ratios. Recycled gypsum was prepared from preclinical casts through pulverization and calcination and five groups were tested using a universal testing machine and stereomicroscope. The results showed that compressive strength ranged from 14.39 MPa (recycled) to 51.74 MPa (control) and dimensional change ranged from 0.0240 to 0.3300, with both parameters increasing significantly with higher proportions of standard dental stone (p = 0.000). Thus, recycled dental stone alone showed inferior properties, whereas its combination with standard gypsum improved performance, indicating that partial replacement can be used without major compromise in quality.
Keywords
Recycled gypsum, Type III dental stone, compressive strength, dimensional stability, dental recycling
Citation
Sudha et al. Bioinformation 22(7): 3996-4001 (2026)
Edited by
Rashmi Laddha
ISSN
0973-2063
Publisher
License
This is an Open Access article which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. This is distributed under the terms of the Creative Commons Attribution License.
