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

BACKGROUND/AIM: Custom-made mouthguards are fabricated on working models. However, the influence of the working model to the mouthguard characteristics has not been clearly established. The aim of this study was to examine the influence of the angle of the working model on the formation of a pressure-formed mouthguard. MATERIALS AND METHODS: Mouthguard sheets of 3.8 mm ethylene vinyl acetate were pressure-formed onto working models. The angle of the working model formed by the labial surface of the central incisor and the base of the working model was set at 85 degrees , 90 degrees , and 95 degrees . The thickness of the mouthguard was measured at the labial surface of the central incisor, and the buccal and occlusal surfaces of the first molar. Differences in the thickness of the mouthguards were analyzed by two-way analysis of variance. RESULTS: Mouthguard thickness varied among the measured regions of the central incisors and first molars (P < 0.01). The thickness at the labial surface of the central incisor and buccal surface of the first molar was greatest for mouthguards formed using the working model with the angle set at 85 degrees (P < 0.01). CONCLUSIONS: The angle of the working model at the labial surface of the central incisor and the base of the working model should be maintained at an acute angle (e.g., 85 degrees ) to control the thickness at the central incisors and the first molars of pressure-formed mouthguards.