Long term durability of composite resin restorations and marginal deterioration using replica SEM observation

• Project/Area Number: 24592858
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Conservative dentistry
• Research Institution: Tohoku University
• Principal Investigator: SASAZAKI HIROMI 東北大学, 大学病院, 講師 (90133991)
• Co-Investigator(Kenkyū-buntansha): ENDO Tatsuo 東北大学, 大学病院, 講師 (20168826)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2012: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
• Keywords: 接着耐久性 / 長期臨床成績 / レプリカ法 / SEM観察 / 窩洞壁適合性 / エナメルエッチング / セルフエッチング / 歯頚部窩洞 / レジン修復物 / 長期耐久性 / レプリカ / 辺縁部劣化 / ボンディング材 / 辺縁部適合状態

Outline of Final Research Achievements

In order to evaluate the long term durability of composite resin restorations , cervical cavities were prepared various bonding agents were applied according to the manufacturers’ instructions. Clinical findings of these fillings were periodically observed. In order to observe the marginal adaptation, impressions of these restorations were taken and precision replicas were made. These replicas were observed by scanning electron microscope. In many cases, marginal adaptation of early stage was good. Marginal steps were observed after 18 months. The width of steps was extended with time. When the bonding layer was exposed at the margin, abrasion progressed from the exposed bonding layer and the marginal fracture of resin materials occurred. Enamel etching effectively improved the adaptation to enamel.

Research Products

• [Presentation] Three-year Evaluation of Composite Restorations in A Multicenter Prospective Tria The 6th International Congress on Adhesive Dentistry (2015)
  • Author(s): Nikaido T., Hosaka K., Kubo S., Maseki T., Rikuta A., Sasazaki H., Satoh K, Shinkai K.,Uno S., Yamamoto T., Yoshikawa K., Yatani H., Momoi Y
  • Organizer: Faculty of Dentistry
  • Place of Presentation: Mahidol University, BANGKOK, THAILAND
  • Year and Date: 2015-01-30 – 2015-02-01
• [Presentation] セルフエッチングプライマーを用いた歯頚部レジン修復物の長期臨床成績 (2014)
  • Author(s): 笹崎弘己、遠藤達雄、齋藤正寛
  • Organizer: 第141回日本歯科保存学会
  • Place of Presentation: 山形市、山形テルサ
  • Year and Date: 2014-10-30 – 2014-10-31
• [Presentation] Long-term Clinical Evaluation ofd Cervical Composite Resin Restorations Treated with Self-etch Primer (2014)
  • Author(s): H.Sasazaki, T.Endo and M.Saito
  • Organizer: Interface Oral Health Science 2013
  • Place of Presentation: Sendai
• [Presentation] Comparison of three types Bond systems for Composite Resin Restorations by using Long-term Clinical Evaluation (2014)
  • Author(s): T.Endo, H.Sasazaki and M.Saito
  • Organizer: Interface Oral Health Science 2013
  • Place of Presentation: Sendai
• [Presentation] セルフエッチングプライマーボンディングシステムを用いた歯頚部レジン修復物の長期臨床成績 (2013)
  • Author(s): 遠藤達雄、青沼 哲、笹崎弘己、齋藤正寛
  • Organizer: 第139回日本歯科保存学会秋季学術大会
  • Place of Presentation: 秋田市
• [Presentation] 光照射器の長時間使用による照射光量の変化 (2012)
  • Author(s): 遠藤達雄、笹崎弘己
  • Organizer: 日本歯科保存学会
  • Place of Presentation: 広島国際センター
• [Book] 保存修復 (2013)
  • Author(s): 片山 直他
  • Total Pages: 161
  • Publisher: クインテッセンス出版株式会社
• [Book] 保存修復 (2012)
  • Author(s): 笹崎弘己
  • Total Pages: 162
  • Publisher: クインテッセンス出版株式会社