Page 47 - MDJ Volume 47 Number 2 ( Jul-Dec 2024)

Abstracts

MIDEC 2024 Abstracts

DOI: 10.4103/MDJ.MDJ_21_24 Keywords: Computer-aided design and computer-aided
manufacturing, dental esthetic, tooth reduction, veneer
P001

Digital Workflow for Designing Stereolithographic P002
Templates in Computer-assisted Tooth Reduction for The Clinical Behaviour and Survival of Computer-aided
Porcelain Laminate Veneers: A Scoping Review Design and Computer-aided Manufacturing Hybrid
Guan Xin, I. M. Tew, Y. H. Beh Ceramic Restorations on Endodontically Treated Teeth:
Department of Restorative Dentistry, Faculty of Dentistry, National University of A Systematic Review and Meta-analysis
Malaysia, Kuala Lumpur, Malaysia
Jonathan Yuen Jun Xian , Z. K. Saw , H. S. Chua , Y. H. Beh 4
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Introduction: Tooth reduction guide is essential for 1 Klinik Pergigian Trong, Ministry of Health, Perak, Malaysia, Trong Dental Clinic,
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enamel preservation during tooth preparation of Ministry of Health, Perak, Malaysia; Bagan Serai Dental Clinic, Ministry of
porcelain laminate veneers to ensure a long-term Health, Perak, Malaysia, Marang Dental Clinic, Ministry of Health, Terengganu,
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success. Studies on clear digital workflows for designing Malaysia, Department of Restorative Dentistry, Faculty of Dentistry, National
stereolithographic templates in computer-assisted University of Malaysia, Kuala Lumpur, Malaysia
tooth reduction for porcelain laminate veneers are Introduction: Hybrid ceramics seek to combine the
lacking. Objective: The purpose of this scoping review mechanical and optical properties of ceramics and
was to identify the publications that described a digital composites to mimic natural teeth. Given the novelty of
workflow on computer-assisted tooth reduction for this restorative material, an evaluation of their clinical
laminated porcelain veneers. Methodology: A systematic performance is warranted. Objective: This systematic
search was conducted in MEDLINE/PubMed, Web of review was to assess the survival of computer-aided design
Science and Scopus to identify articles published between and computer-aided manufacturing (CAD-CAM) hybrid
year 2014 to March 2024 in the English language. The ceramic restorations on endodontically treated teeth and
recruited articles met the eligibility criterion of articles to describe the incidence of complications. Methodology:
that digitally designed and fabricated tooth reduction The study was registered in PROSPERO and adhered
guides in tooth preparation for porcelain laminate to PRISMA guidelines. A comprehensive search across
veneers. Articles reporting on a conventional tooth six online databases was performed. Clinical studies
preparation procedure or digitally designed guides for which involved CAD-CAM hybrid ceramic restorations
tooth reduction assessment were excluded. Results: Seven on endodontically treated teeth were included. Several
clinical reports met inclusion criteria. The software used investigators independently conducted the study selection,
for designing stereolithographic templates varied among data extraction, and quality assessment processes. Risk
the included articles. Four articles favored ExoCad of bias were assessed using Cochrane RoB 2 tool and
dental software, while other three used Meshmixer, Viax Newcastle-Ottawa Scale. Failure rates were analysed using
Dental Technologies, and 3Shape software respectively. Poisson regression models to obtain summary estimates
Prior to designing templates, only four articles of 3- and 5-year survival proportions which were pooled
incorporated virtual tooth preparation. Most articles using a random-effects model. Subgroup analysis was
reported fabricating a single template while the other performed between two hybrid ceramic materials, resin
two articles reported designing a series of templates for nanoceramic (RNC) and polymer infiltrated ceramic
step-by-step tooth preparation. Two articles described network (PICN). Results: The search resulted in 250 studies
tube designs, two articles featured cross shapes, one after duplicate removal. Full-text analysis was performed
article applied the first-fit system technique, and the for 24 articles and 11 articles were included in the final
remaining two used open window and access designs. analysis. Meta-analysis of 289 restorations revealed an
All articles reported printing the templates using resin overall estimated failure rate of 3.44 (95% confidence
with various types of 3D printers. The limitations of the interval [95% CI]: 2.67–4.21) per 100-restoration years,
templates varied depending on their designs, fabrication, translating to a survival rate of 90.2% (95% CI: 88.1–
and application in clinical practice. Conclusion: There 92.3%) after 3 years and 84.2% (95% CI: 81.0–87.5%) after
is a lack of standardization in the digital workflow for 5 years. A significantly higher (p < 0.05) failure rate was
designing stereolithographic templates for laminated reported for RNC (5.97%, CI: 3.52–8.41%) compared to
porcelain veneers, largely due to significant variability in PICN restorations (1.61%, CI: 0.87–2.36%). Restoration
the software and method used, as well as the number and debonding was the main reason for failure. Conclusion:
designs of the templates. Restoring endodontically treated teeth with CAD-CAM

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