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Determination of the lingual border of lower complete dentures: How to use a silicone impression material?
Fumiaki Yamazaki1, Yusuke Mihara1, Yoshinobu Maeda1
1Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka, Japan.
Objectives:
This study aimed to clarify the efficacy of a border-moulding procedure with low-flow silicone impression material compared with a conventional compound to complete denture fabrication. It also aimed to evaluate the influence of various functional tasks during the lingual-side moulding procedure regarding the depth and width of the border.
Methods:
Ten dentate subjects (three men, seven women; average age 30 years) were enrolled in this study after giving informed consent. A specially designed custom impression tray for the mandibular lingual side was fabricated for each subject. With the tray and heavy-body-type silicone material, lingual border moulding was performed that included four functional tasks: tongue protrusion (TP), licking the upper lip with the tongue (UL), swallowing (SW), and placing the tongue tip to the palate (PP).
Results:
Within the limitations of this study, the results suggested that heavy-body silicone impression material is satisfactory for use in the border-moulding procedure, giving reproducible results.
Conclusion:
There were no significant differences among the functional tasks regarding the depth and width of the lingual flange except for swallowing, which exhibited the largest values.
