Influence of Preparing Condition of the Working Cast and Mouthguard Sheet on Thickness of Mouthguard

Abstract

The aim of this study was to examine the infl uence of the preparing condition of the working cast and mouthguard sheet on the thickness of mouthguard. Methods: We used a mouthguard sheet (127 127 3.8 mm). The sheets were formed by a vacuum former when they were heated until they were hung 1.5 cm from baseline. The thickness of the mouthguard sheet was measured at the part fi tted to anterior and posterior teeth. As the preparing conditions of the working cast, relations among the measurement point, setting position, and temperature of the working cast as well as among measurement point, setting position, and angle of the working cast were analyzed by Three-way ANOVA. As the condition of the mouthguard sheet, the relation between the measurement point and temperature of the sheet was analyzed by Twoway ANOVA. Results: The thickness at anterior teeth became bigger at the condition that the working cast was set in the posterior position, and that of posterior teeth became bigger at the condition that the working cast was set in the center position. The thickness at anterior and posterior teeth became bigger at the condition that the angle of the working cast was set 80. The thickness at anterior teeth became bigger when the temperature of the mouthguard sheet was high. Conclusions: These results suggest that the thickness of the mouthguard could be maximized when the position of the part of the working cast that need to keep the thickness was set in the center, the angle of the working cast was set to 80 , and the temperature of the mouthguard sheet was high.

Influence of working model angle on the formation of a pressure‐formed mouthguard

“…This is consistent with previous studies (13,14) that showed changes within model angle have an effect on thickness. The mouthguard was thicker at the cervical region.…”

“…This result is consistent with a previous study (14). The mouthguard was thicker at the cervical region than at the cusp region.…”

“…The heating temperatures used in this study were approximately 98.3°C for the MP85 condition, 101.8°C for the MP90 condition, and 100.5°C for the MP95 condition. In one study that reported the influence of the angle of the working model to the thickness of vacuum-formed mouthguard, the angles of the working model were set at 80°, 90°, and 100° (14). Previous studies have investigated the mouthguard thickness according to the model inclination by fabricating the angulation blocks with the angle of 15°, 30°, and 45°using pressure forming (10).…”

“…The heating temperatures of the three conditions were fairly consistent but not the same because of the influence of the environment such as room temperature and humidity. In this study, the angles of the working model were set at 85°, 90°, and 95°because the angles set in the previous study (14) caused the height of the working model to be higher than necessary. In one study that reported the influence of the angle of the working model to the thickness of vacuum-formed mouthguard, the angles of the working model were set at 80°, 90°, and 100° (14).…”

Influence of working model position on the formation of a pressure‐formed mouthguard

“…Custom‐made mouthguards are fabricated by either a vacuum‐forming process or a pressure‐forming process . A previous study reported that the position of the working model influenced the thickness of vacuum‐formed mouthguards . However, the way in which the position of the working model influences the thickness of pressure‐formed mouthguards has not been determined.…”