Hironaka Nallu Gomes Lima, Trizzi Juliana Quintino, Yoshida Natália Miwa, Cury Jaime Aparecido, Tabchoury Cinthia Pereira Machado, Botelho Juliana Nunes, Pini Nubia Inocencya Pavesi, Pascotto Renata Corrêa
State University of Maringá, Maringá, Brazil.
State University of São Paulo, Araçatuba, Brazil.
J Investig Clin Dent. 2019 Nov;10(4):e12456. doi: 10.1111/jicd.12456. Epub 2019 Sep 4.
High-viscosity glass-ionomer cements (HV-GIC) are indicated for restorations but their viscosity favors the inclusion of bubbles within it. This study aimed to evaluate the use of ultrasonic and sonic waves in bubble formation, microhardness and fluoride release in a HV-GIC, also considering a different powder:liquid ratio (P/L).
Twenty-four molars with occlusal cavities were divided into four groups (N = 6): CG, HV-GIC with manual insertion; UG, application of ultrasonic waves; SG, application of sonic waves; and FG, HV-GIC fluid (1:2 P/L) with manual insertion. After 24 hours, bubbles and microhardness (50 g/5 s) were measured. Fluoride release (N = 10) was evaluated in CG, SG and UG after cariogenic challenge for 11 days. Microhardness, total area and number of bubbles, and fluoride release were submitted to ANOVA and Tukey's test. The average size of bubbles was analyzed by Kruskal-Wallis test (α = 5%).
FG presented the lowest value of microhardness and higher average size for bubbles (P < .05). Differences concerning total number, total area occupied by bubbles and fluoride release were not found (P > .05).
The use of sonic and ultrasonic waves had no influence on bubble formation, microhardness and fluoride release of a HV-GIC. Changing the P/L is not recommended.
高粘度玻璃离子水门汀（HV-GIC）适用于修复，但其粘度有利于在其中形成气泡。本研究旨在评估超声波和声波在HV-GIC气泡形成、显微硬度和氟释放方面的作用，同时考虑不同的粉液比（P/L）。
将24颗有咬合面龋洞的磨牙分为四组（N = 6）：CG组，手动填入HV-GIC；UG组，施加超声波；SG组，施加声波；FG组，手动填入液状HV-GIC（1:2 P/L）。24小时后，测量气泡和显微硬度（50 g/5 s）。对CG组、SG组和UG组在致龋刺激11天后评估氟释放情况（N = 10）。显微硬度、气泡总面积和数量以及氟释放情况进行方差分析和Tukey检验。气泡平均尺寸通过Kruskal-Wallis检验分析（α = 5%）。
FG组显微硬度值最低，气泡平均尺寸更大（P <.05）。在气泡总数、气泡占据的总面积和氟释放方面未发现差异（P >.05）。
超声波和声波的使用对HV-GIC的气泡形成、显微硬度和氟释放没有影响。不建议改变P/L。
