Effects Of Physiologic Anchorage Spee's-wire System (PASS) Technique On Soft And Hard Tissue During Aligning Stage

Objective: The Physiological Anchorage Spee-wire System(PASS)is a technique that combines the use of the traditional edgewise appliance,straight wire appliance,self ligating brackets,with the advantages of using Begg appliance,and the rational of using all the physiological forces in the oral cavity.The forces on the anchorage is less used in this method to help coordinate the teeth as much as possible to their proper physiologic location.The oral physiological forces that influence the clinical and anatomical teeth position comes mainly from the labial forces,buccal forces,lingual forces,occlusal forces,and the periodontal ligament;those forces will reduce the mechanical forces of the appliance when transporting the teeth along the wire to coordinate them to their correct physiological position,correct physiological tooth axis and correct functional position in relation to the surrounding anatomical boundary.This article uses the cephalometric study of PASS technique's changes that affect the bone and the soft tissue,to observe the clinical effect,and also to provide reference for clinicians.Materials and methods: The patients were randomly selected from the Department of Stomatology at the First Affiliated Hospital of Dalian Medical University,from October 2014-June 2016.The Patients were diagnosed with malocclusion.For this study,we used the PASS technique for the treatment of 31 cases;9 Males,and 21 female.2 of those cases had a class I skeletal type occlusion,16 cases had skeletal II type malocclusion,13 cases jad skeletal III malocclusion.The 31 cases were divided into different groups according to the facial angle(FMA = 22°? to ? 31° is defined as the average angle group,FMA ? 22°is defined as the low angle group and they consist of 16 cases,and FMA > 31 is defined as the high angle group and they consist of 15 cases.The 31 cases then were divided according to age into adult group(>18)and consisting of 18 cases,and young group(?18)consisting of 13 cases.Results:The treatment time of 31 patients ranged from 8 to 15 months,with an average of 12.26 ± 1.69 months.Have received a good anterior teeth aligned,molar backwards,soft tissue profile also received a slight improvement.1.Overall,PASS technology in the row of the hard tissue of the little effect,after correction of soft tissue index LL-EL reduced 0.09 mm,statistically significant.2.Age factors: After treatment,the soft tissue index LL-EL in the adolescent group decreased by 1.43 mm and was statistically significant.In the adult group,the APDI value decreased by 2.53 ° and was statistically significant.However,there was no difference in the therapeutic effect between the two treatment groups.3.Growth factor: After treatment,NP-FH increased 1.44 °,MP-SN decreased 1.8 °,FH-MP decreased 1.36 °,soft tissue index LL-EL decreased 0.97 mm,the four measurement indicators Statistically significant,non-high angle group only APDI reduced by 2.22 °,statistically significant.However,the difference of MP-SN and FH-MP between different growth types was statistically significant,and the therapeutic effect between the two treatment groups was different.Conclusion: 1.Overall,PASS technology in the stage of the hard tissue on the bone effect of little effect on the lower lip has a small impact.2.There was no significant difference in the effect of age on the bone tissue effect of PASS in the row stage,suggesting that both teenagers and adults can achieve good effects.3.High-angle cases in the vertical height to a certain degree of control,low-angle cases in the vertical height to a certain increase.