الفهرس 
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Abstract
One of the most significant goals of preventive orthodontics is to preserve arch length during different developing dentition stages. Malocclusion, over-eruption of opposing tooth and delayed eruption of permanent successors are the main drawbacks of premature lost primary teeth and the best management of the space is to insert space maintainer. The study aimed to assess clinical performance, mean survival time and joint tensile strength of chairside band and loop space maintainers. The study was conducted on thirty healthy children aged between four to seven years old from outpatient clinic Pedodontic Department, Faculty of Dentistry, Tanta University. Thirty children had bilateral premature loss of mandibular primary first molars and indicated for band and loop SMs were selected; sixty selected spaces were divided into two groups according to types of space maintainer used. One group was managed with insertion of chairside SMs, while the other group was managed with conventional SMs. All groups were evaluated clinically at three, six and nine months respectively. The gingival index and caries assessment were done using dental unit light with periodontal probe to measure the mean gingival index and caries condition throughout the follow up periods. To measure the tensile strength, ten samples for both groups were molded in epoxy resin using UTM at Restorative and Dental Materials Research Department, National Research Centre, Cairo. The overall clinical success rate for chairside SMs was 83.33% with 13.34% failure rate. While, the success rate of conventional SMs was 73.33% with 23.34% failure rate and both groups showed 3.33% lost to follow.