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Original Research

Open Access Special Issue

Optimal post height and diameter in preformed zirconia crown restoration on 3D-printed primary incisors

  • Jong-Sung Kim1,†
  • Gi-Min Kim1,†
  • Hyun-Jung Kim1
  • Jae-Sik Lee1,*,

1Department of Pediatric Dentistry, School of Dentistry, Kyungpook National University, 41940 Daegu, Republic of Korea

DOI: 10.22514/jocpd.2023.053 Vol.47,Issue 5,September 2023 pp.57-64

Submitted: 14 December 2022 Accepted: 24 March 2023

Published: 03 September 2023

(This article belongs to the Special Issue New technologies and materials in clinical pediatric dentistry)

*Corresponding Author(s): Jae-Sik Lee E-mail: leejs@knu.ac.kr

† These authors contributed equally.

Abstract

In this in vitro study, fracture resistance was evaluated according to the post-diameter and -length in zirconia crown restorations on three-dimensional printed primary incisors undergone pulpectomy. One hundred-and-sixty primary incisor abutments were used which were artificially fabricated through 3D-printing. Each group was divided into two subgroups based on the zirconia post-diameter (1.5 mm and 2.0 mm) employed for post setting after pulpectomy. Furthermore, each group was divided into four subgroups based on the zirconia post-height (3.0, 4.0, 5.0 and 6.0 mm). Zirconia post setting was made by applying flowable resin after filling the pulp cavity with calcium hydroxide up to 3.0 mm below cemento-enamel junction (CEJ). Finally, a preformed zirconia crown of size #1 was cemented to the abutment through resin cement. A compressive load was applied to the middle palatal surface of incisors restored with zirconia crowns by using a universal testing machine at 145◦ angle which is the normal interincisal angle of children. The root fracture specimens were excluded and the samples fractured within crown and core parts were included in the final fracture resistance analysis. The group with 1.5-mm post-diameter and 5.0-mm post-height had the highest fracture resistance strength (130.63 ± 55.75 N) under masticatory pressure condition. Fracture resistance was statistically greater in 5.0-mm than in 4.0-mm and 3.0-mm post-height groups for 1.5-mm post-diameter subgroup. Moreover, 5.0-mm post-height subgroup had a statistically greater fracture resistance than that of 3.0-mm post-height subgroup for 2.0-mm post-diameter group. The 2.0-mm post-diameter subgroup had a statistically greater fracture resistance than that of 1.5-mm post-diameter subgroup for 3.0-mm and 4.0-mm post-heights. If zirconia post incorporation is required for deciduous incisor restoration, a post-length equal to facial CEJ level is recommended for gaining additional retention against masticatory pressure.


Keywords

3D-printing; Fracture resistance; Zirconia crown; Zirconia post-setting


Cite and Share

Jong-Sung Kim,Gi-Min Kim,Hyun-Jung Kim,Jae-Sik Lee. Optimal post height and diameter in preformed zirconia crown restoration on 3D-printed primary incisors. Journal of Clinical Pediatric Dentistry. 2023. 47(5);57-64.

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