Clinical Application And Efficacy Evaluation Of Loop Space Maintainer Prevent Missing Primary Molars' Space Change

Deciduous teeth early loss is Deciduous teeth missing before the normal time of deciduous tooth exfoliation. According to the survey, our children's teeth early loss situation has been very serious. Deciduous teeth is the necessary tools for children to chew food , If the Deciduous teeth cannot plays its role well because of dental caries will affect the digestion and absorption, then make adverse consequences of the children's growth and development. Deciduous teeth can effectively stimulates bone growth in masticatory process and create favorable conditions for the following permanent teeth smoothly eruption and beautiful face shape. The ugly appearance and unclear pronunciation caused by dental caries of deciduous teeth will make psychological harm to children such as self-abased, lack of self-confidence and so on and affect their normal social intercourse and growth.Deciduous teeth early loss will affect inherited permanent teeth after the eruption of normal position and cause permanent teeth arrangement irregularly. Especially primary molars early loss, can lead to arch length of permanent teeth decreases, deep malocclusion, increase dental crowding and teeth displacement, eruption difficulties and dissymmetry of dental arch. Therefore, it is necessary to keep edentulous space after deciduous teeth early loss. Deciduous teeth space maintainer can keep adjacent teeth abnormalities of the lack of gap sport. Make permanent teeth normal eruption, reduce or avoid tooth column crowded. This research mainly aimed at primary molars early loss after gap analysis, apply space maintainer can be prevention clearance loss. Objective Through the observation primary molars early loss by wire circle type maintain transmitters and without using Space maintainer clearance changes, study the retainer wire circle type to prevent breast molar early loss of lost after clearance of effect.Methods Choose August 2006 ~ August 2008, hefei, oral cavity hospital children secco medical children 103 cases, missing primary molars 122 star as the research object. 103 patients with early breast molar randomized wearing lose keep device, or don't wear the retainer, compared with two groups of the gap between the length of the bow change, the change of teeth. Experimental use wire circle type maintain device and the control group don't wear keep device.For each group of cases every 3 months, 6 months, nine months and 12 months check regularly. No checks regularly and wire circle keep device or breaking off not timely medical patients do not bring into choice scope. Compare the model take from the visits every time with original model. Use vernier caliper respectively in wear can be obtained pre-and-post gypsum model measurements. Measuring two adjacent teeth shape the distance between the highs. At the same time to do not make the retainer cases, also take modulus measurements. Both are compared.Results By the analysis and comparison of two groups of patients lose primary molars formed earlier clearance changes, proof of transmitter can prevent lack SM adjacent teeth abnormalities mobile band, make the permanent teeth normal eruption, reduce or avoid tooth column crowded. (1) The early loss of primary molars patients should undertake clearance management, prevent adjacent teeth tilt, prevention of permanent teeth appear insufficient space.(2) Lack of gap within the interradicular root permanent teeth has not been formed or only form small, but dental crowns already began early eruption of must stop eruption and while maintaining clearance.(3)Wire circle to early emergence can be temporary resistance impaction permanent teeth. Conclusion Wearing wire circle can be missing teeth gap still maintain well, conduce to the permanent teeth normal eruption. Not wearing the retainer who decrease its clearance. Age, the smaller the patient is easier to narrow the gap of teeth. The healing process jaw in constant growth, wearing the retainer does not affect the normal development of the bone.Recommend use wire circle type can be, can maintain a Deciduous teeth early lost clearance, for permanent teeth normal eruption provide guarantee.Wire circle type can be insufficient for root growth can 1/2 of early impaction permanent teeth play resistance impaction role.