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Debonding Time and Dental Pulp Temperature With the Er, Cr: YSGG Laser for Debonding Feldespathic and Lithium Disilicate Veneers

Marzieh Alikhasi, Abbas Monzavi, Hooman Ebrahimi, Maryam Pirmoradian-najafabadi, Ahmadreza Shamshiri, Rezvaneh Sadat Ghazanfari Hashemi




Introduction: The removal of ceramic veneers is a time-consuming procedure in a dental
office. Little research has been done in alternative removal techniques for ceramic veneers.
The objective of this study was to evaluate the removal of feldspathic and lithium disilicate
reinforced glass ceramic veneers by Er, Cr: YSGG and to measure debonding time and pulpal
temperature increase during veneer removal.

Methods: Fifty-seven bovine incisor teeth were prepared and divided into 3 groups. Ceramic
specimens with a thickness of 0.7mm, a width of 4mm and a length of 8 mm were fabricated
from feldspathic ceramic, lithium disilicate reinforced glass ceramic HT (high translucency) and
lithium disilicate reinforced glass ceramic MO (medium opacity) (19 for each group). Specimens
were cemented on the labial surface of incisors using resin cement. The Er, Cr: YSGG laser
was applied to each specimen at 2.5 W and 25 Hz. Debonding time was measured for each
specimen, and the intrapulpal temperature was detected in 3 specimens for each group. Data
were analyzed via one-way analysis of variance (ANOVA) at significance level of 0.05 (α = 0.05).

Results: Mean debonding time was 103.68 (26.76), 106.58 (47.22) and 103.84 (32.90) seconds
for feldspathic, lithium disilicate MO, and lithium disilicate HT respectively. There was no
significant statistical difference among the groups (P value = 0.96). The intrapulpal temperature
increase was less than 1°C in all groups.

Conclusion: Er, Cr: YSGG can successfully be used to efficiently debond feldspathic and lithium
disilicate reinforced glass ceramic veneers. There was no significant difference for debonding
time among these ceramic materials. During ceramic laminate veneer removal by laser
irradiation, no irritating temperature rise was detected.


Porcelain Laminate Veneer; Er, Cr: YSGG Laser; Debonding


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DOI: https://doi.org/10.22037/jlms.v10i3.20542