title: Gradual surface degradation of restorative materials by acidic agents.
abstract: The aim of this study was to investigate the effect of acidic agents on surface roughness and characteristics of four restorative materials. Fifty-two discs were created from each restorative material: metal-reinforced glass ionomer cement (Ketac-S), resin-modified glass ionomer cement (Fuji II LC), resin composite (Filtek Z250), and amalgam (Valiant-PhD); each disc was 12 mm in diameter and 2.5 mm thick. The specimens were divided into four subgroups (n=13) and immersed for 168 hours in four storage media: deionized water (control); citrate buffer solution; green mango juice; and pineapple juice. Surface roughness measurements were performed with a profilometer, both before and after storage media immersion. Surface characteristics were examined using scanning electron microscopy (SEM). Statistical significance among each group was analyzed using two-way repeated ANOVA and Tukey's tests. Ketac-S demonstrated the highest roughness changes after immersion in acidic agents (p<0.05), followed by Fuji II LC. Valiant-PhD and Filtek Z250 illustrated some minor changes over 168 hours. The mango juice produced the greatest degradation effect of all materials tested (p<0.05). SEM photographs demonstrated gradual surface changes of all materials tested after immersions. Of the materials evaluated, amalgam and resin composite may be the most suitable for restorations for patients with tooth surface loss.
authors: Department of Conserative Dentistry, FAculty of Dentistry, Prince of Songkla University, Hat Yai, Songkhla, Thailand.
authors: Chanothai
authors: C
authors: Hengtrakool
authors: Boonlert
authors: B
authors: Kukiattrakoon
authors: Ureporn
authors: U
authors: Kedjarune-Leggat
mesh_terms: D000143:Acids / Q000737:chemistry; D031230:Ananas; D001628:Beverages; D002021:Buffers; D016722:Cermet Cements / Q000737:chemistry; D002951:Citrates / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003723:Dental Amalgam / Q000737:chemistry; D003764:Dental Materials / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D007101:Immersion; D031022:Mangifera; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019279:Resin Cements / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D000143:Acids; D002021:Buffers; D016722:Cermet Cements; D002951:Citrates; D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials; C444701:Filtek Z250; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D019279:Resin Cements; D012117:Resins, Synthetic; D014867:Water; D003723:Dental Amalgam; C072894:Valiant PhD