title: Retention of fissure sealants using two different methods of application in teeth with hypomineralised molars (MIH): a 4 year clinical study.
abstract: OBJECTIVE
  This was to evaluate the retention rate of fissure sealants applied to MIH molars with occlusal enamel opacities, using two different application methods after 4 years.
  
  
  METHODS
  54 children exhibiting molars with MIH aged 6-7 years, participated in the study.
  
  
  METHODS
  presence of at least 2 fully erupted caries-free maxillary or mandibular first permanent molars in the opposite sides of the mouth, both with occlusal enamel opacities without breakdown. Following parental consent, sealants were applied using a half-mouth experimental design. Group A: On a randomly assigned first molar on one side of the mouth sealants Fissurit were placed using a single bottle adhesive system (One-step prior to sealant application. Group B: Sealants were applied on the contra-lateral molar using the conventional etch and seal technique. Children were seen biannually when a preventive program was applied, without replacing any lost sealant.
  
  
  RESULTS
  After 4 years, 47 sets of molars (94 teeth) were available for blind evaluation. Teeth in Group A presented a better retention rate; 70.2% were fully sealed, 29.7% partly sealed and none unsealed (lost sealant). Group B revealed 25.5% fully sealed, 44.6% partly sealed and 29.7% unsealed teeth.
  
  
  METHODS
  Differences between groups A and B were statistically significant (p<0.001). Also both groups revealed a decreasing retention rate over the 4-year period (p<0.001). There was no difference in dental caries increment rate and enamel breakdowns at the end of the study (p>0.01).
  
  
  CONCLUSIONS
  In hypomineralised molars with occlusal opacities sealants appear to have greater retention when applied using 5th generation adhesive systems prior to sealant.
authors.affiliation: Dept of Paediatric Dentistry, Community Dental Center for Children, Athens, Greece. lygidakis@ath.forthnet.gr
authors.forename: N A
authors.initials: NA
authors.lastname: Lygidakis
authors.forename: G
authors.initials: G
authors.lastname: Dimou
authors.forename: E
authors.initials: E
authors.lastname: Stamataki
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D002327:Cariostatic Agents / Q000627:therapeutic use; D002648:Child; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000473:pathology; D003777:Dental Prophylaxis; D017220:Dentin-Bonding Agents / Q000627:therapeutic use; D005460:Fluorides, Topical / Q000627:therapeutic use; D005500:Follow-Up Studies; D006801:Humans; D008689:Methacrylates / Q000627:therapeutic use; D008963:Molar / Q000473:pathology*; D009910:Oral Hygiene; D010756:Phosphoric Acids / Q000008:administration & dosage; D010895:Pit and Fissure Sealants / Q000627:therapeutic use*; D016037:Single-Blind Method; D013499:Surface Properties; D017001:Tooth Demineralization / Q000473:pathology / Q000628:therapy*
chemical_list: C103506:Bis-GMA, BPDM, HEMA dental-bonding resin; D002327:Cariostatic Agents; D017220:Dentin-Bonding Agents; C407603:Fissurit F; D005460:Fluorides, Topical; D008689:Methacrylates; D010756:Phosphoric Acids; D010895:Pit and Fissure Sealants; C030242:phosphoric acid