title: Comparison of the retentive strength of 3 different posts in restoring badly broken primary maxillary incisors.
abstract: OBJECTIVE
  The management of mutilated primary incisors in early childhood caries is a clinical challenge and necessitates the use of intraradicular retention. This study's purpose was to compare the retentive strength of 3 different types of posts in restoring broken primary incisors: (1) composite posts; (2) orthodontic "gamma" wire posts; and (3) glass fiber posts.
  
  
  METHODS
  This vitro study was performed on 30 extracted human primary maxillary incisors. Samples were randomly divided into 3 groups of 10 each: group 1 (composite posts and composite core); group 2 (orthodontic "gamma" wire posts and composite core); and group 3 (glass fiber posts and composite core). Mounted specimens were subjected for tensile strength on an Instron testing machine. The values were statistically analyzed.
  
  
  RESULTS
  Mean tensile strength values for glass fiber posts was 5.89+/-0.66 kg force, followed by 4.46+/-0.82 and 3.56+/-0.53 kg force for orthodontic wire posts and composite posts, respectively, with a statistically significant difference between and within the groups (P<.01). Groups 1 and 2 showed more bulk cohesive failure and less adhesive bond failure. Group 3 showed only adhesive bond failure.
  
  
  CONCLUSIONS
  Glass fiber posts showed greater dislodging strength, followed by orthodontic "gamma" wire posts and, least of all, composite posts.
authors.affiliation: Department of Pedodontics, Faculty of Dentistry, AI-Arab Medical University, Benghazi, Libya. drragsBO@gmail.com
authors.forename: Kumar R
authors.initials: KR
authors.lastname: Gujjar
authors.forename: K R
authors.initials: KR
authors.lastname: Indushekar
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D003764:Dental Materials; D017268:Dental Prosthesis Retention / Q000379:methods*; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D005898:Glass; D006801:Humans; D007180:Incisor / Q000601:surgery*; D008422:Materials Testing; D008437:Maxilla; D009969:Orthodontic Wires; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D013718:Tensile Strength; D014094:Tooth, Deciduous / Q000601:surgery*; D015035:Zinc Oxide-Eugenol Cement
chemical_list: D003764:Dental Materials; D015035:Zinc Oxide-Eugenol Cement; C009753:fiberglass