IADR Abstract Archives
Cephalometric comparison of soft tissues between two different head positions in incompetent labial children.
Objectives: To determine soft tissue differences in cephalometric analyses in different head positions.
Methods: Were selected 46 healthy children with lips incompetence (age range: 7-12 years) of both genders, who attended the dentistry faculty of the University of Chile between 2015 and 2016. Lips incompetence was defined by a clinical criterion, such as those children who in the mandibular rest position had their lips apart. Two lateral cephalograms were performed, one in the head assisted position (HAP) and the other in the natural head position (NHP). For both, the child was positioned, with the legs slightly apart, arms at the side of the body and lips at rest. In the HAP the Frankfurt plane and bipupilar line were positioned parallel to the floor, with nasofrontal support and with olives. For the NHP the children was asked to keep his head in the usual position, facing the horizon, with soft support in Nasion and without olives. Cephalometry was performed considering some landmarks of Rickets and Bjork cephalometric analysis. Data were analyzed using adequate statistical analysis (α = 0.05).
Results: In NHP the aesthetic line of the lip was lower in relation to the HAP. No significant differences for the labial protrusion and the length of the lower lip.
Conclusions: The position of the head as well as the position of the mandible depends on muscular and proprioceptive factors. Changes in the mandible position and rotation have been described in the NHP when compares to the HAP. These switch, modify the mandibular references of soft tissues in cephalometric analyses and, consequently, lower values could be associated with measurements involving mandibular references.
Methods: Were selected 46 healthy children with lips incompetence (age range: 7-12 years) of both genders, who attended the dentistry faculty of the University of Chile between 2015 and 2016. Lips incompetence was defined by a clinical criterion, such as those children who in the mandibular rest position had their lips apart. Two lateral cephalograms were performed, one in the head assisted position (HAP) and the other in the natural head position (NHP). For both, the child was positioned, with the legs slightly apart, arms at the side of the body and lips at rest. In the HAP the Frankfurt plane and bipupilar line were positioned parallel to the floor, with nasofrontal support and with olives. For the NHP the children was asked to keep his head in the usual position, facing the horizon, with soft support in Nasion and without olives. Cephalometry was performed considering some landmarks of Rickets and Bjork cephalometric analysis. Data were analyzed using adequate statistical analysis (α = 0.05).
Results: In NHP the aesthetic line of the lip was lower in relation to the HAP. No significant differences for the labial protrusion and the length of the lower lip.
Conclusions: The position of the head as well as the position of the mandible depends on muscular and proprioceptive factors. Changes in the mandible position and rotation have been described in the NHP when compares to the HAP. These switch, modify the mandibular references of soft tissues in cephalometric analyses and, consequently, lower values could be associated with measurements involving mandibular references.