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Light-Assisted Debonding of Zirconia...

Jauregui Ulloa, Jaccare Tanit,

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Light-Assisted Debonding of Zirconia Ceramics /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Light-Assisted Debonding of Zirconia Ceramics // Jaccare Tanit Jauregui Ulloa.
Author:	Jauregui Ulloa, Jaccare Tanit,
Description:	1 electronic resource (152 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-08, Section: B.
Contained By:	Dissertations Abstracts International86-08B.
Subject:	Dentistry. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31768118
ISBN:	9798304968409

Light-Assisted Debonding of Zirconia Ceramics /
Jauregui Ulloa, Jaccare Tanit,

Light-Assisted Debonding of Zirconia Ceramics /Jaccare Tanit Jauregui Ulloa. - 1 electronic resource (152 pages)

Source: Dissertations Abstracts International, Volume: 86-08, Section: B.

Zirconia ceramic has become one of the most popular materials for fixed dental prostheses due to its remarkable mechanical properties, including high hardness and fracture toughness. These qualities make zirconia an ideal material to withstand the forces exerted during mastication. However, the high hardness of this material presents a significant challenge when attempting to remove zirconia restorations, particularly when using traditional methods. Diamond burs have been traditionally used to remove ceramic restorations by drilling from the buccal to the lingual aspect of these restorations. However, when it comes to zirconia restorations, the material resists the drilling process due to its outstanding mechanical properties, fatiguing both the dentist and patient. The removal time using such traditional method ranges from 4 minutes for non-adhesively bonded zirconia crowns using specific removal burs to a longer duration for adhesively bonded ones. Moreover, traditional removal techniques can irreversibly damage the underlying substrate. To address these challenges, erbium-based lasers have been used as an alternative technique for the removal of zirconia restorations. In this work, different laser parameters were tested to assess the efficacy of an erbium-based laser to remove zirconia structures.The first part of the research hypothesized that low-power laser irradiation could induce the debonding of zirconia structures without generating temperatures harmful to the pulp tissue. The effect of zirconia thickness and irradiation time on both temperature and shear bond strength post-laser irradiation was assessed. The findings showed that zirconia thickness significantly influences both temperature elevation and shear bond strength reduction. Specifically, the 0.5 mm zirconia group exhibited significantly higher temperatures compared to the 2 mm and 3 mm groups. Moreover, the 0.5 mm group demonstrated significantly lower bond strength than the non-irradiated control, as well as the 2 mm and 3 mm irradiated groups. Unlike zirconia thickness, the irradiation time did affect temperature during laser irradiation. Although irradiation time did influence the bond strength, it only had an effect on the 0.5 mm group, in which an irradiation time of 120 seconds resulted in the lowest bond strength value, promoting spontaneous debonding. Building on these findings, we concluded that low-power irradiation is ineffective for promoting debonding of thick zirconia (2 and 3 mm). Therefore, in the second phase of the study, we hypothesized that high-power laser irradiation over a short duration (120 seconds) may promote debonding of zirconia crowns. For this, we investigated the effects of high-power laser irradiation on thermal response, cytotoxicity, phase transformation, and spontaneous debonding. The results demonstrated that high-power laser irradiation did not induce unsafe temperatures for the pulp tissue. However, it negatively affected the viability of cells and caused localized phase transformation on the zirconia surface. Furthermore, while high-power irradiation successfully induced spontaneous debonding in zirconia slices 2 mm and 3 mm thick, it failed to achieve the same for zirconia crowns with thicknesses up to 1.5 mm.In summary, this work presents an exploratory investigation of laser parameters for promoting the debonding of zirconia restorations, along with its effects on the temperature, cytotoxicity and the material's structural integrity. Further directions include modification of luting agents with nanoparticles to achieve laser assisted debonding within a 120-second timeframe.

English

ISBN: 9798304968409Subjects--Topical Terms:

828971
Dentistry.
Subjects--Index Terms:

Bond strength

Light-Assisted Debonding of Zirconia Ceramics /
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520 $a Zirconia ceramic has become one of the most popular materials for fixed dental prostheses due to its remarkable mechanical properties, including high hardness and fracture toughness. These qualities make zirconia an ideal material to withstand the forces exerted during mastication. However, the high hardness of this material presents a significant challenge when attempting to remove zirconia restorations, particularly when using traditional methods. Diamond burs have been traditionally used to remove ceramic restorations by drilling from the buccal to the lingual aspect of these restorations. However, when it comes to zirconia restorations, the material resists the drilling process due to its outstanding mechanical properties, fatiguing both the dentist and patient. The removal time using such traditional method ranges from 4 minutes for non-adhesively bonded zirconia crowns using specific removal burs to a longer duration for adhesively bonded ones. Moreover, traditional removal techniques can irreversibly damage the underlying substrate. To address these challenges, erbium-based lasers have been used as an alternative technique for the removal of zirconia restorations. In this work, different laser parameters were tested to assess the efficacy of an erbium-based laser to remove zirconia structures.The first part of the research hypothesized that low-power laser irradiation could induce the debonding of zirconia structures without generating temperatures harmful to the pulp tissue. The effect of zirconia thickness and irradiation time on both temperature and shear bond strength post-laser irradiation was assessed. The findings showed that zirconia thickness significantly influences both temperature elevation and shear bond strength reduction. Specifically, the 0.5 mm zirconia group exhibited significantly higher temperatures compared to the 2 mm and 3 mm groups. Moreover, the 0.5 mm group demonstrated significantly lower bond strength than the non-irradiated control, as well as the 2 mm and 3 mm irradiated groups. Unlike zirconia thickness, the irradiation time did affect temperature during laser irradiation. Although irradiation time did influence the bond strength, it only had an effect on the 0.5 mm group, in which an irradiation time of 120 seconds resulted in the lowest bond strength value, promoting spontaneous debonding. Building on these findings, we concluded that low-power irradiation is ineffective for promoting debonding of thick zirconia (2 and 3 mm). Therefore, in the second phase of the study, we hypothesized that high-power laser irradiation over a short duration (120 seconds) may promote debonding of zirconia crowns. For this, we investigated the effects of high-power laser irradiation on thermal response, cytotoxicity, phase transformation, and spontaneous debonding. The results demonstrated that high-power laser irradiation did not induce unsafe temperatures for the pulp tissue. However, it negatively affected the viability of cells and caused localized phase transformation on the zirconia surface. Furthermore, while high-power irradiation successfully induced spontaneous debonding in zirconia slices 2 mm and 3 mm thick, it failed to achieve the same for zirconia crowns with thicknesses up to 1.5 mm.In summary, this work presents an exploratory investigation of laser parameters for promoting the debonding of zirconia restorations, along with its effects on the temperature, cytotoxicity and the material's structural integrity. Further directions include modification of luting agents with nanoparticles to achieve laser assisted debonding within a 120-second timeframe.
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653 $a Bond strength
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653 $a Laser irradiation
653 $a Temperature
653 $a Zirconia
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710 2 $a The University of Mississippi Medical Center. $b Biomedical Materials Science. $e degree granting institution. $3 3824881
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