title: Two-year clinical comparison of a flowable-type nano-hybrid composite and a paste-type composite in posterior restoration.
abstract: OBJECTIVE
  The purpose of the present study was to compare the clinical efficacy between a flowable-type nano-hybrid composite and a paste-type composite for posterior restoration.
  
  
  METHODS
  Of 62 posterior teeth in 33 patients (mean age: 34.1 years), 31 were filled with a paste-type composite (Heliomolar [HM] group), and another 31 with a flowable nano-hybrid composite (MI FIL [MI] group). Clinical efficacy was evaluated at 2 years after the restoration.
  
  
  RESULTS
  There were no differences for retention, surface texture deterioration, anatomical form change, deterioration of marginal adaptation, and secondary caries, while a statistical difference was found for marginal discoloration, which was significantly greater in the HM group (P < 0.05). Furthermore, color matching in the MI group was superior to that in the HM group immediately after the restoration throughout the study period.
  
  
  CONCLUSIONS
  The present 2-year clinical evaluation of different composites showed that the flowable nano-hybrid composite could be an effective esthetic material for posterior restoration.
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Shizu
authors.initials: S
authors.lastname: Hirata-Tsuchiya
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Shinji
authors.initials: S
authors.lastname: Yoshii
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Miki
authors.initials: M
authors.lastname: Ichimaru-Suematsu
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Ayako
authors.initials: A
authors.lastname: Washio
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Saito
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Mariko
authors.initials: M
authors.lastname: Urata
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Kaori
authors.initials: K
authors.lastname: Hanada
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Takahiko
authors.initials: T
authors.lastname: Morotomi
authors.affiliation: Department of Oral Functions, Division of Endodontics and Restorative Dentistry, Kyushu Dental University, Kitakyushu, Fukuoka, Japan.
authors.forename: Chiaki
authors.initials: C
authors.lastname: Kitamura
mesh_terms: D000180:Acrylic Resins; D000328:Adult; D000368:Aged; D003188:Composite Resins; D003793:Dental Restoration, Permanent; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D036103:Nanotechnology; D011140:Polyurethanes; D013997:Time Factors; D055815:Young Adult
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; C513708:Heliomolar; D011140:Polyurethanes; C111840:flowable hybrid composite
keywords: clinical comparison; flowable-type composite; nano-hybrid composite; paste-type composite; posterior restoration