A Study on the Toothbrush-Dentifrice Abrasion of Class V Restroations

치경부 5급 와동 수복의 잇솔질 마모에 관한 연구

  • Hwang, Su-Jin (Department of Conservative Dentistry & Institute for Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Yu, Mi-Kyung (Department of Conservative Dentistry & Institute for Oral Bioscience, School of Dentistry, Chonbuk National University) ;
  • Lee, Kwang-Won (Department of Conservative Dentistry & Institute for Oral Bioscience, School of Dentistry, Chonbuk National University)
  • 황수진 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 유미경 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소) ;
  • 이광원 (전북대학교 치과대학 치과보존학교실 및 구강생체과학연구소)
  • Published : 2005.06.30


The objective of this study was to evaluate the toothbrush abrasion characteristics of class V restorations. Thirty extracted human premolars, which were collected from oral surgery clinics were used. We mounted five teeth in a metal ring mold of 50 mm in diameter and 15 mm in height using chemically cured acrylic resin. Class V cavities were prepared in lingual cervical root surfaces and restored using one of following restorative materials : Dentin Conditioner/Fuji II LC (Group FL), All Bond II/Z-250 (Group ZT), One-up Bond F/Palfigue Estelite (Group PE), F2000 Primer/Adhesive (Group FT), and Prime & Bond 2.1/Dyract AP (Group DR). They were stored under distilled water at $37^{\circ}C$ for seven days. The toothbrush abrasion test was conducted using a wear testing machine of pin-on disk type under a load of 1.5 N for 100,000 cycles. We have examined the bonded interfaces, the changes of surface roughness and color of abraded surfaces. From this experiment, the following results were obtained. 1. The change of surface roughness showed high degree: RMGIC>compomer>composite resin (p<0.05). 2. Because of the protrusion and missing of filler particles, SEM observation of abraded surfaces of RMGIC and compomers revealed the increase of surface roughness due to the selective removal of matrix resin. 3. The color change by toothbrush abrasion was affected in large part by the change of $L^*$ and $b^*$ of resin composites (p<0.05). 4. The color change by toothbrush abrasion was so small to detect by human eyes. 5. SEM observation of abraded surfaces revealed the interface bonding was the best in the FT group.


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