Study on the thickness-change of different thickness thermoplastic materials after thermoforming and saliva immersion / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To survey and compare the thickness-change of different thickness thermoplastic materials under different test condition and make sure the relationship between the thickness-change and the material initial thickness in order to provide a guide in selecting the suitable thickness thermoplastic in practice.</p><p><b>METHODS</b>To choose Biolon, the thickness include 1.0 mm, 0.75 mm, 0.5 mm. Used Electron Vernier caliper to measure the thickness-change of different thickness thermoplastic materials under different processing mode. The data was analyzed by SPSS 10.0.</p><p><b>RESULTS</b>After thermoforming the thickness of thermoplastic became thinner, the thickness of Biolon 0.75 mm decreased by 0.14 mm, Biolon 1.0 mm decreased by 0.22 mm and Biolon 0.5 mm decreased by 0.14 mm. After saliva immersion the thickness became thicker. The thickness of Biolon 0.75 mm increased by 0.02 mm, Biolon 1.0 mm increased by 0.03 mm and Biolon 0.5 mm increased by 0.02 mm.</p><p><b>CONCLUSION</b>1)The influence of different processing mode to the thickness-change had relation to the material initial thickness. 2)The Biolon 0.75 mm had certain superiority in thickness stability compared to the homogeneous brand through the above research.</p>

Preliminary clinical application of Chinese-made invisible orthodontic technique / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To treat simple malocclusions preliminarily using Chinese-made invisible orthodontic aligners and discuss the indications, problems existed and future development.</p><p><b>METHODS</b>Forty-one cases with different malocclusions were selected, including crowding, spaces and spaces due to periodontal problems. Invisible aligners were made and worn by patients and they were changed every 2 - 3 weeks.</p><p><b>RESULTS</b>Acceptable treatment results were obtained in all cases, with nice alignments and good overbite and overjet. Treatment time ranged from 6 - 25 months.</p><p><b>CONCLUSIONS</b>Indications of this technique were still limited and the technique needed to be further developed in the future.</p>