Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors

Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors

The present study aimed to compare the polymerization shrinkage, degree of conversion and fracture strength of endodontically treated maxillary lateral incisors restored using novel zirconia reinforced rice husk nanohybrid composite with commercialized microhybrid and nanofilled composites. 180 s...

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Main Author: Lin, Galvin Sim Siang
Format: Thesis
Language:English
Published: 2020
Subjects:
R Medicine
Online Access:http://eprints.usm.my/48866/1/GALVIN%20SIM%20SIANG%20LIN%20-FINAL%20THESIS%20P-SGM001419%28R%29%20PWD_-24%20pages.pdf
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spelling my-usm-ep.488662021-04-13T04:38:27Z Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors 2020 Lin, Galvin Sim Siang R Medicine The present study aimed to compare the polymerization shrinkage, degree of conversion and fracture strength of endodontically treated maxillary lateral incisors restored using novel zirconia reinforced rice husk nanohybrid composite with commercialized microhybrid and nanofilled composites. 180 samples were used for polymerization shrinkage and degree of conversion tests, divided into Group 1 – nanofilled composite (Filtek-Z350-XT), Group 2 – microhybrid composite (Zmack- Comp) and Group 3 – experimental nanohybrid composite (Zr-Hybrid). The test for polymerization shrinkage was performed using buoyancy and optical methods. For the buoyancy method, samples were weighed in air and water to calculate the shrinkage value, while for the optical method, images of samples before and after light-curing were captured using a microscope to calculate the shrinkage value. The conversion degree was tested using the FTIR spectrometer. Eighty mature permanent lateral maxillary incisors were selected for the fracture strength test and divided into: Group 1 – ET + Filtek-Z350- XT, Group 2 – ET + Zmack-Comp, Group 3 – ET + Zr-Hybrid and Group 4 – Intact teeth (control). Standardised MPD cavity was prepared, and endodontic treatment was performed using crown-down technique up to size 30. Obturation was completed using single cone technique with gutta-percha and AH Plus sealer. Cavity access was restored with respective composite resins. Next, the teeth were stored in the incubator for 24 hours and subdivided into aged and non-aged subgroups. Teeth in aged subgroups underwent 2,500 thermal cycles. Subsequently, all teeth were tested under the Universal Testing Machine until fractures occurred. They were then examined under a microscope to determine the fracture pattern and type of fracture. Data were analysed using One-way ANOVA for polymerization shrinkage, conversion degree and fracture strength. The fracture pattern and fracture type were analysed using the Chi-square test. Zr-Hybrid showed comparable shrinkage (p>0.05) to Filtek-Z350-XT, but lower shrinkage (p<0.05) than Zmack-Comp. Zr-Hybrid showed a higher conversion degree (p<0.05) than Filtek- Z350-XT and a comparable conversion value with Zmack-Comp. Besides, ET + Zr- Hybrid demonstrated the highest fracture strength in both aged and unaged subgroups. The fracture strength decreased significantly in ET + Filtek-Z350-XT and ET + Zmack- Comp (p<0.05) as the thermocycles increased but no significant differences were noted in ET + Zr-Hybrid and control Group 4. Moreover, ET + Zr-Hybrid and control Group 4 showed more favourable fracture pattern. In conclusion, Zr-Hybrid exhibited excellent shrinkage and conversion values. Endodontically treated teeth restored with Zr-Hybrid demonstrated superior fracture strength and favourable fracture pattern. 2020 Thesis http://eprints.usm.my/48866/ http://eprints.usm.my/48866/1/GALVIN%20SIM%20SIANG%20LIN%20-FINAL%20THESIS%20P-SGM001419%28R%29%20PWD_-24%20pages.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Pergigigian
institution Universiti Sains Malaysia
collection USM Institutional Repository
language English
topic R Medicine
spellingShingle R Medicine
Lin, Galvin Sim Siang
Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors
description The present study aimed to compare the polymerization shrinkage, degree of conversion and fracture strength of endodontically treated maxillary lateral incisors restored using novel zirconia reinforced rice husk nanohybrid composite with commercialized microhybrid and nanofilled composites. 180 samples were used for polymerization shrinkage and degree of conversion tests, divided into Group 1 – nanofilled composite (Filtek-Z350-XT), Group 2 – microhybrid composite (Zmack- Comp) and Group 3 – experimental nanohybrid composite (Zr-Hybrid). The test for polymerization shrinkage was performed using buoyancy and optical methods. For the buoyancy method, samples were weighed in air and water to calculate the shrinkage value, while for the optical method, images of samples before and after light-curing were captured using a microscope to calculate the shrinkage value. The conversion degree was tested using the FTIR spectrometer. Eighty mature permanent lateral maxillary incisors were selected for the fracture strength test and divided into: Group 1 – ET + Filtek-Z350- XT, Group 2 – ET + Zmack-Comp, Group 3 – ET + Zr-Hybrid and Group 4 – Intact teeth (control). Standardised MPD cavity was prepared, and endodontic treatment was performed using crown-down technique up to size 30. Obturation was completed using single cone technique with gutta-percha and AH Plus sealer. Cavity access was restored with respective composite resins. Next, the teeth were stored in the incubator for 24 hours and subdivided into aged and non-aged subgroups. Teeth in aged subgroups underwent 2,500 thermal cycles. Subsequently, all teeth were tested under the Universal Testing Machine until fractures occurred. They were then examined under a microscope to determine the fracture pattern and type of fracture. Data were analysed using One-way ANOVA for polymerization shrinkage, conversion degree and fracture strength. The fracture pattern and fracture type were analysed using the Chi-square test. Zr-Hybrid showed comparable shrinkage (p>0.05) to Filtek-Z350-XT, but lower shrinkage (p<0.05) than Zmack-Comp. Zr-Hybrid showed a higher conversion degree (p<0.05) than Filtek- Z350-XT and a comparable conversion value with Zmack-Comp. Besides, ET + Zr- Hybrid demonstrated the highest fracture strength in both aged and unaged subgroups. The fracture strength decreased significantly in ET + Filtek-Z350-XT and ET + Zmack- Comp (p<0.05) as the thermocycles increased but no significant differences were noted in ET + Zr-Hybrid and control Group 4. Moreover, ET + Zr-Hybrid and control Group 4 showed more favourable fracture pattern. In conclusion, Zr-Hybrid exhibited excellent shrinkage and conversion values. Endodontically treated teeth restored with Zr-Hybrid demonstrated superior fracture strength and favourable fracture pattern.
format Thesis
qualification_level Master's degree
author Lin, Galvin Sim Siang
author_facet Lin, Galvin Sim Siang
author_sort Lin, Galvin Sim Siang
title Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors
title_short Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors
title_full Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors
title_fullStr Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors
title_full_unstemmed Polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors
title_sort polymerization shrinkage, degree of conversion of zirconia reinforced rice husk nanohybrid composite and its fracture strength on the endodontically treated maxillary incisors
granting_institution Universiti Sains Malaysia
granting_department Pusat Pengajian Sains Pergigigian
publishDate 2020
url http://eprints.usm.my/48866/1/GALVIN%20SIM%20SIANG%20LIN%20-FINAL%20THESIS%20P-SGM001419%28R%29%20PWD_-24%20pages.pdf
_version_ 1747821970220646400

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