Copolymer, Cycloaliphatic, Denture base, Dimensional stability, Linear shrinkage
Citation Information :
Ajay R, Rakshagan V, Sasikala R, Baburajan K, Kalarani G, Suma K. Evaluation of Linear Dimensional Stability of Monomethacrylate-based Dental Polymer Containing a Novel Tricyclic Diacrylate Cross-linker Using a Novel Surface-level Index Technique. World J Dent 2022; 13 (6):568-573.
Aim and objectives: To evaluate and compare the linear dimensional stability of denture base copolymer containing a cycloaliphatic comonomer by employing conventional engraving technique (ET) and a novel surface-level index technique (SLIT).
Materials and methods: Group I employed the SLIT and group II employed the ET. The subgroups were divided under both groups based on the: (1) Cycloaliphatic comonomer's concentrations (SG0, SG10, SG20, EG0, EG10, and EG20); (2) Corresponding mold spaces (SM0, SM10, SM20, EM0, EM10, and EM20). Rectangular mold spaces with four reference points were measured using the Euclidean norm. A total of 120 rectangular specimens (n = 20 for each subgroup) were fabricated and the distances between the reference points in the specimens were measured. The differences between the Euclidean norms of the molds and the resultant specimens were recorded.
Results: A significant difference in the linear distortion between the techniques till 10% TCDDMDA comonomer concentration was observed beyond which there is no difference between the techniques. Within the techniques, a statistically significant difference in the linear distortion among and between the subgroups was evident.
Conclusion: Employing the SLIT showed an amplified linear distortion of the denture base specimens when compared to ET. The novel copolymer P(MMA-Co-TCDDMDA) with 20% TCDDMDA demonstrated negligible linear dimensional distortion with either technique.
Clinical significance: Employing P(MMA-Co-TCDDMDA) copolymer as denture base shall not only offset dimensional and occlusal inaccuracies but also improve the retention and stability of the denture base and eventually the life quality of the edentulous population.
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