Flexural strength and flexural modulus of repaired 3D-printed denture base resin: Effects of reinforcement and thermal cycling.

Authors

Ayaka Ito, Tomohiro Kawaguchi, Ami Tanaka, Hakuhei Morita, Hayato Nishi, Ippei Hamanaka, Takashi Tsuzuki

Published in

Journal of prosthodontic research. Sep 08, 2026. Epub Sep 08, 2026.

Abstract

This study evaluated the effects of reinforcement materials and thermal cycling (TC) on the flexural strength and modulus of repaired three-dimensional (3D)-printed denture base resin.
Specimens were fabricated from a 3D-printed denture base resin and assigned to five groups: positive control (PC; intact), negative control (NC; repaired with autopolymerizing resin only), metal repair (MR), fiber repair-thin (FR-thin), and fiber repair-thick (FR-thick). Each group was further subdivided into no TC (NTC) and TC (10,000 cycles) conditions. Flexural strength and modulus were measured using a three-point bending test. Data (n = 10 per group) were analyzed using nonparametric statistical methods (α = 0.05).
Under both NTC and TC conditions, the NC group exhibited the lowest flexural strength and modulus (P < 0.05). The FR-thick group demonstrated the highest flexural strength and modulus, and after TC, its flexural strength was comparable to that of the PC group (P > 0.05). Failure mode analysis showed complete fractures in the PC and NC groups, whereas the MR and FR-thick groups consistently exhibited incomplete fractures regardless of TC. TC significantly reduced the flexural strength and modulus in all groups except the FR-thin group (P < 0.05).
Thick glass fiber reinforcement yielded the greatest improvement in the flexural strength and modulus of the tested vat-photopolymerization-based 3D-printed denture base resin after repair. Following TC, the flexural strength of the FR-thick group was comparable to intact specimens, and its flexural modulus remained the highest among all groups.

PMID:
42716736
Bibliographic data and abstract were imported from PubMed on 10 Sep 2026.

Read full publication at:
Please sign in to see all details.

Stats

1-terrible, 9-excellent. How would you rate this publication? Sign in in to submit your rating.

Post a comment

You need to be signed in to post comments. You can sign in here.

Comments

There are no comments yet.