The removal of three kinds of occlusal veneers by Er: Yag laser.
10.7518/hxkq.2023.2023038
- Author:
Jianyu ZHU
1
;
Feifei HONG
1
;
Lianghang HE
2
;
Wei WEN
2
;
Xianlin LEI
2
;
Zhisheng ZHANG
1
;
Lu YIN
1
Author Information
1. Stomatological Hospital of Xiamen Medical College, Xiamen Key Laboratory of Stomatological Disease Diagnosis and Treatment, Xiamen 361000, China.
2. Dept. of Oral Medicine, Xiamen Medical College, Xiamen 361023, China.
- Publication Type:Journal Article
- Keywords:
Er: Yag laser;
debonding;
glass ceramics;
occlusal veneer;
resin-based ceramics;
scanning electron microscope
- MeSH:
Lasers, Solid-State;
Materials Testing;
Dental Porcelain/chemistry*;
Ceramics/chemistry*;
Bicuspid;
Dental Veneers
- From:
West China Journal of Stomatology
2023;41(5):568-572
- CountryChina
- Language:English
-
Abstract:
OBJECTIVES:This study aimed to remove occlusal veneers of varied thicknesses and compositions by Er:Yag laser in vitro and analyze the interfacial microstructure between veneers and tooth that irradiated by laser, by which experimental evidence could be provided to support the non-invasive removal of occlusal veneerby laser.
METHODS:Fresh mandibular premolars extracted for orthodontic requirements were collected for tooth preparation. Three kinds of ceramic materials (Vita Suprinity, Vita Mark Ⅱ, and Upcera Hyramic) were selected to fabricate occlusal veneer with different thicknesses (1.0, 1.5, and 2.0 mm). One week later, Er:Yag laser (2.5 W and 3.5 W) was used to irradiate and remove the occlusal veneer and recorded the timespan. After the removal operation, the micro-morphologies of samples were examined by scanning electron microscope.
RESULTS:Upcera Hyramic veneer failed to be removed (>20 min); the operation span at 2.5 W, Vita Suprinity (96.0 s±16.0 s) was longer than Vita MarkⅡ(84.5 s±19.5 s) in the 1.0 mm group (P<0.05), and Vita Suprinity (246.5 s±13.5 s) was longer than Vita MarkⅡ(170.0 s±14.0 s) in the 1.5 mm group (P<0.05). At 3.5 W, Vita Suprinity (381.0 s±24.0 s) was longer than Vita MarkⅡ(341.5 s±26.5 s) in the 2.0 mm group.
CONCLUSIONS:Increasing laser power could shorten the operation span and facilitate the removal of occlusal veneers with the same thickness and composition. The occlusal veneer was sustained when insufficient laser power was applied. With the same laser power and ceramic thickness, laser penetration could interfere with the integral of the ceramic structure when the laser interacted with the bonding layer. With the same ceramic composition and laser power, the operation span and laser power increased with the thickness of the occlusal veneer. However, the laser was incapable of removing occlusal resin veneer directly.
