Abstract :
Hypofunction teeth are a common problem in orthodontic clinics. This study aimed to determine the number of blood vessels in the tension and pressured side of hypofunction teeth during orthodontic tooth movement. Orthodontic tooth movement was done in the maxillary incisors of eighteen Male Wistar rats using a palatal coil spring of 0.012" stainless steel wire to deliver 35cN of orthodontic force for separating the maxillary incisors. The antagonist's tooth was reduced every two days by two mm to develop the upper left tooth's hypofunction. Rats were divided into the normal (N) and the hypofunction teeth orthodontic (H) groups and stained by Hematoxylin Eosin. The number of blood vessels in the tension and pressure side of ligament periodontal on day zero (D0), five (D5), and ten (D10) were analyzed using three-way ANOVA. The results showed that blood vessels in H groups were significantly lower than in the N groups (p < 0.05). There was no significant difference in the number of blood vessels between the tension and pressured side (p > 0.05). There was no significant difference in the number of blood vessels between days zero, five, and ten (p > 0.05). There was no significant difference in the number of blood vessels based on the interaction of all variables (p > 0.05). The number of blood vessels was affected by the hypofunction condition. During orthodontic tooth movement, the number of blood vessels in hypofunctional teeth is lower than in the normal teeth group.
