Clinical evaluation of the light cured resin-modified glass ionomer cement as an orthodontic bonding material : Incidence of bracket failure during treatment, pain reaction and residual cements at debonding

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  • SAITO,Shigeru
    Department of Orthodontics, School of Dentistry, Showa University
  • FUJISHIMA,Akihiro
    Department of Oral Biomaterials and Technology, School of Dentistry, Showa University
  • MIYAZAKI,Takashi
    Department of Oral Biomaterials and Technology, School of Dentistry, Showa University
  • SHIBASAKI,Yoshinobu
    Department of Orthodontics, School of Dentistry, Showa University

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  • 光重合レジン添加型グラスアイオノマーセメントの歯科矯正用ボンディング材としての臨床的評価 : DBS 患者におけるブラケットの脱落率, ディボンディング時の疼痛と歯面へのセメント残留について

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A clinical evaluation was carried out to compare the clinical bond strength of a light cured resin-modified glass ionomer cement (LC) with a MMA, 4-META resin (SB). This was used in combination with two types of bracket materials ; metal (ME) and ceramic (CE). Eighteen patients entered the trial and 316 brackets were placed. The incidence and site of bond failure was recorded. The overall failure rate for LC in combination with both types of bracket was 0.8% and 1.6% for SB. There was statistically significant difference detected between the failure rates of LC and SB. In addition, the pain level at bracket debonding was evaluated by visual analogue scales (VAS). None of each combination listed below was found to be statistically significant ; between VAS score of SB and LC, ME and CE at anterior segment, between anterior teeth and premolars, maxillary teeth and mandibular teeth. Finally, the residual cements on enamel surface after bracket debonding was also examined visually with naked eyes and a microscope. The results indicated that the volume of the residual cements by LC was slightly lesser than those by SB, however, these differences were not statistically significant. These findings indicate that the frequency of bracket failure during active orthodontic treatment with LC was lesser than those with SB. Resultantly, LC suggested to be a effective bonding material for multi-bracket system.

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