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Flexural strength, fracture toughness, and denture tooth adhesion of computer aided milled and printed denture bases

Malik, Aneeqa
http://rave.ohiolink.edu/etdc/view?acc_num=osu1563296646075298

Abstract Details

2019, Master of Science, Ohio State University, Dentistry.
Objectives: This in vitro study evaluated the flexural strength, fracture toughness, and mode of tooth to base fracture of computer aid milled (highly dense prepolymerized polymethyl methacrylate) and 3D printed (diurenthane methacrylate) denture bases compared to conventional compression molded heat cured polymethly methacrylate (PMMA). Methods: Three tests were performed: flexural testing, fracture toughness, and denture tooth to base bond. For flexural testing, 75 rectangular specimens (65mm x 10mm x 3mm) were fabricated from compression molded Leuctione 199, Avadent and Ivobase CAD prepolymerized PMMA pucks, and Formlabs and Dentca photopolymerized urethane dimethacrylate (UDMA) (n = 15). After 50 hours of storage in water at 37ºC +/-1ºC, each sample was subjected to a three point bend test at a rate of 5mm/min until fracture. Load to fracture was recorded. Ultimate flexural strength and elastic modulus were calculated. For fracture toughness, 75 rectangular specimens (65mm x 10mm x 3mm) were fabricated with a uniform crack in each sample. After 7 days of storage in water at 37ºC +/-1, each sample was subjected to a three point bend test at a rate of 1mm/min. Load to fracture was recorded, and maximum stress intensity factor was calculated. For flexural strength, elastic modulus, and fracture toughness, non parametric Dunn test was used comparing each sample to the control Leucitone 199. For tooth to base fracture mode, 40 samples were fabricated from Leuctione 199, Avadent monolithic, Ivobase CAD, and Dentca. Samples consisted of the same denture tooth anatomy bonded to a base of 25mm in diameter and 40mm in height. An instron machine was used to load the tooth at a rate of 1mm/min. The type of fracture whether adhesive, cohesive, or mixed was recorded. Results: For ultimate flexural strength and flexural modulous, AvaDent resin was significantly stronger than Leuctione 199; Dentca was significantly weaker than Leuctione 199 (p<.05). Formlabs and IvoBase CAD resin had no significant difference in flexural strength than Leuctione 199 (p>.05). For fracture toughness, both photopolymerized UDMA resins Dentca and Formlabs were significantly weaker than Leuctione 199 (p<.05). Both Avadent and Ivoclar had no statistical difference in fracture toughness to Leuctione 199 (p>.05). For tooth to base fracture type, all Avadent and Dentca samples had 100% cohesive failure, IvoBase CAD had 100% mixed failure, and Leucitone 199 had a variety of adhesive, cohesive, and mixed failures. Conclusions: Depending on the the brand for flexural strength, milled denture bases can be stronger to conventional heat cured PMMA bases, and 3D printed denture bases can be weaker to conventional heat cured PMMA bases. For fracture toughness, printed denture bases are weaker than heat cured PMMA; milled and heat cured denture bases have no difference in strength. For tooth to base fracture type, all samples passed ISO standard of acceptable bond with less than 33% of failures being adhesive.
Edwin McGlumphy, DDS, MS (Advisor)
Fengyuan Zheng, BDS, PhD (Committee Member)
Jeremy Seidt, PhD (Committee Member)
41 p.
Dentistry
PMMA denture bases, denture bases, flexural strength denture base, printed denture base, milled denture base, flexural strength UDMA, flexural strength PMMA, fracture toughness PMMA, fracture toughness UDMA, fracture toughness denture base

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Citations

  • Malik, A. (2019). Flexural strength, fracture toughness, and denture tooth adhesion of computer aided milled and printed denture bases [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563296646075298

    APA Style (7th edition)

  • Malik, Aneeqa. Flexural strength, fracture toughness, and denture tooth adhesion of computer aided milled and printed denture bases. 2019. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1563296646075298.

    MLA Style (8th edition)

  • Malik, Aneeqa. "Flexural strength, fracture toughness, and denture tooth adhesion of computer aided milled and printed denture bases." Master's thesis, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1563296646075298

    Chicago Manual of Style (17th edition)

osu1563296646075298
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This open access ETD is published by The Ohio State University and OhioLINK.