Evidence map›Paper›PMID 42747611›Full record

ArticleClinical oral investigations2026

Effect of tooth preparation design on fracture load and fracture behavior of deciduous crowns fabricated by subtractive and additive manufacturing.

Misaki Hamashima, Kanae Wada, Shinya Oishi, Hidekazu Takahashi, Kaori Kohi, Daiki Kondo, Yujeong Shin, Yuika Yamanaka, Atsushi Oishi, Asuna Sugimoto and 4 more

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Article in Clinical oral investigations, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

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Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

0 citing papers in PubMed.

No citing paper in PubMed yet.

4 · The record

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PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

14 authors.

Misaki HamashimaDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Kanae WadaDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan. wadadohs@tmd.ac.jp.
Shinya OishiDepartment of Oral and Maxillofacial Rehabilitation, Prosthodontics, Institute of Science Tokyo, Tokyo, Japan.
Hidekazu TakahashiDepartment of Oral Biomedical Engineering, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, Japan.
Kaori KohiDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Daiki KondoDepartment of Oral and Maxillofacial Rehabilitation, Prosthodontics, Institute of Science Tokyo, Tokyo, Japan.
Yujeong ShinDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Yuika YamanakaDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Atsushi OishiDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Asuna SugimotoDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Kanako KishimaDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Yumiko NakashimaDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Rika KurogoshiDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.
Tsutomu IwamotoDepartment of Pediatric Dentistry/Special Needs Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, 1-5-45 Yushima, Bunkyo-ku, Tokyo, Japan.

Funding

Japan Society for the Promotion of Science JP24K13194
6 · The paper itself

Abstract

objectivesThis study evaluated the effects of crown material and margin design on fracture load and behavior of computer-aided design/computer-aided manufacturing (CAD-CAM) crowns for deciduous molars.

methodsThree subtractive-manufacturing (SM) materials and two additive-manufacturing (AM) materials were evaluated. Crowns with knife-edge, chamfer, and deep chamfer margins were fabricated and bonded to standardized deciduous molar abutments (n = 12/group; total = 180). Fracture load was measured under static loading, and fracture modes were classified by repairability and abutment involvement. Fracture surfaces and crack propagation were examined by scanning electron microscopy.

resultsSignificant effects of material and material-margin interactions were observed (p < 0.05). ESTELITE BLOCK II exhibited the highest fracture load with knife-edge margins, whereas Detax showed the highest values with deep chamfer margins. However, non-repairable abutment-involving fractures occurred in both materials with knife-edge margins. CERASMART PRIME showed lower fracture load but mainly repairable fractures. SHOFU BLOCK HC and CERASMART PRIME, unified crown-abutment fracture in ESTELITE BLOCK II, interlayer delamination in Detax, and superficial radial cracking in NextDent.

conclusionsThe effects of margin design on fracture load and fracture behavior were material-dependent. Among subtractive-manufacturing materials, fracture load was generally consistent with reported mechanical properties, whereas fracture behavior in additive-manufacturing materials may have been influenced by internal structure and build orientation. Material selection should consider fracture load, fracture severity, and abutment involvement. CLINICAL RELEVANCE: Material and margin selection influence fracture resistance and failure patterns. Fracture severity and abutment involvement should be considered in addition to fracture load.

Indexed as

Computer-Aided DesignCrownsDental Prosthesis DesignDental Restoration FailureTooth, DeciduousTooth Preparation, ProsthodonticDental AbutmentsDental Stress AnalysisHumansMaterials TestingMicroscopy, Electron, ScanningMolarSurface PropertiesAdditive manufacturingCAD-CAMDeciduous crownsFracture behaviorFracture loadSubtractive-manufacturing

Identifiers

PMID42747611
PMCPMC13582367

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.