Background: Polymerization shrinkage is an innate characteristic of thermo-polymerized denture base acrylic resin. Volumetric shrinkage is still a problem, although myriad material modifications. Ring-opening oxaspiro monomers have promising volumetric expansions of about 7%. These monomers have diminished the shrinkage in dental filling resins through copolymerization (CP). However, their CP with denture base resins is not reported yet.
Purpose: The aim is to confirm the CP of an oxaspiro monomer with methyl methacrylate (MMA) by radical-cationic hybrid polymerization and to assess the degree of conversion (DC) of the formed copolymer.
Materials And Methods: The oxaspiro monomer was synthesized by a transesterification reaction. The study groups were based on the composition and thermo-polymerization method. The control and E1 groups were thermo-polymerized in water-bath, whereas the E2 group in a laboratory autoclave. Both E1 and E2 groups contained the oxaspiro monomer and cationic initiator. E2 group had an additional radical initiator. The CP and DC were confirmed and assessed by infrared spectroscopy.
Results: Accentuation of carbonyl peak, the disappearance of the spiro-carbon peak, and the appearance of ether linkages in experimental groups confirmed the ring-opening. E2 group had the highest DC.
Conclusion: The oxaspiro monomer successfully copolymerized with MMA and had good DC.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8375785 | PMC |
| http://dx.doi.org/10.4103/jpbs.JPBS_582_20 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Synthesis, Duplex-Forming Ability, and Nuclease Resistance of Oligonucleotides Containing a Thymidine Derivative with a 1-Oxaspiro[4.5]decane Skeleton.
Chem Pharm Bull (Tokyo)
August 2023
Graduate School of Pharmaceutical Sciences, Osaka University.
Chemically modified nucleic acids are essential for the therapeutic application of oligonucleotides. In this study, 6'-C-spiro-thymidine exhibiting a fixed torsion angle γ was designed, synthesized, and incorporated into oligonucleotides. The conformational analysis of the 6'-C-spiro-thymidine monomer revealed that its torsion angle γ was in the +synclinal range (approx.
View Article and Find Full Text PDFHistocompatibility of Thermopolymerized Denture Base Copolymer Processed with a Novel Ring-opening Oxaspiro Comonomer: A Histomorphometric Investigation in Rats.
J Contemp Dent Pract
November 2021
Department of Prosthodontics and Crown and Bridge, Priyadharshini Dental College, Tiruvallur, Tamil Nadu, India.
Aim And Objective: The aim of the research was to evaluate the histocompatibility of thermopolymerized (TP) novel denture copolymer containing 3,9-dimethylene-1,5,7,11-tetraoxaspiro[5,5]undecane (DMTOSU) comonomer in rats' palatine tissue.
Materials And Methods: The rats were randomly categorized into four groups ( = 6 per group). G: Denture base appliance (DBA) fabricated by short polymerization cycle in a water bath without DMTOSU; G: DBA with 20 wt.
Copolymerization of Ring-Opening Oxaspiro Comonomer with Denture Base Acrylic Resin by Free-Radical/Cationic Hybrid Polymerization.
J Pharm Bioallied Sci
June 2021
Department of Prosthodontics and Crown and Bridge, Vinayaka Missions Sankarachariyar Dental College and Hospital, Salem, Tamil Nadu, India.
Background: Polymerization shrinkage is an innate characteristic of thermo-polymerized denture base acrylic resin. Volumetric shrinkage is still a problem, although myriad material modifications. Ring-opening oxaspiro monomers have promising volumetric expansions of about 7%.
View Article and Find Full Text PDFSynthesis and Characterization of a Ring-Opening Oxaspiro Comonomer by a Novel Catalytic Method for Denture Base Resins.
J Pharm Bioallied Sci
June 2021
Department of Prosthodontics and Crown and Bridge, JKK Nattraja Dental College and Hospital, Komarapalayam, Tamil Nadu, India.
Background: 3,9-Dimethylene-1,5,7,11-tetraoxaspiro[5,5]undecane (DMTOSU) is a double ring-opening monomer that exhibits expansion upon polymerization and may be used as a denture base resin's comonomer to offset or minimize polymerization shrinkage. It's synthesis by transesterification reaction (TE) catalyzed by distannoxane is not reported in the literature. The synthesis became the prime concern because this monomer is hardly available commercially.
View Article and Find Full Text PDFDevelopment and validation of a fast gas chromatography mass spectrometry method for the quantification of selected non-intentionally added substances and polystyrene/polyurethane oligomers in liquid food simulants.
Anal Chim Acta
September 2020
FoodOmicsGR Research Infrastructure, AUTh Node, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center B1.4, 10th Km Thessaloniki-Thermi Rd, P.O. Box 8318, GR 57001 Thessaloniki, Greece; Biomic AUTh, Center for Interdisciplinary Research and Innovation (CIRI-AUTH), Balkan Center B1.4, 10th Km Thessaloniki-Thermi Rd, P.O. Box 8318, GR 57001, Thessaloniki, Greece; Department of Chemistry, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece.
A simple, fast, sensitive and reliable method was developed for the simultaneous determination of 13 food contact materials (FCM) regulated substances and non-intentionally added substances (NIAS) migrating into official food simulants. The method has been optimized to quantify the monomers styrene and α-methyl styrene, selected polystyrene oligomers (dimers, trimers) and polyester urethane-based oligomers (PU) cyclic oligomers, as well as cyclic NIAS originating from food packaging such as 2,6-Di-tert-butylbenzoquinone and 7,9-Di-tert-butyl-1-oxaspiro(4,5)deca-6,9-diene-2,8-dione. The method employs liquid-liquid extraction of aqueous ethanol food simulants with dichloromethane, and analysis with gas chromatography coupled to mass spectrometry (GC-MS) with a total analysis time of less than 16 min, with limits of detections ranging from 0.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!