2003-15-3-123-130 - Saudi Dental Journal

ISSN (Print) 1013-9052
EISSN 1658-3558

The Saudi Dental Journal,
P.O. Box 52500,
Riyadh 11563,
Kingdom of Saudi Arabia

Tel.	966-1-467-7328
Fax.	933-1-467-7308 / 966-1-467-7534
Email	saudidj@ksu.edu.sa

Repairability of resin-modified glass-ionomer and

polyacid-modified resin composite cements

Manal Al-Malik, BDS, MSc, PhD
King Fahd Armed Forces Hospital, Jeddah, Saudi Arabia

Restorations often need additions or repairs. Previous studies have shown that this is possible with varying degrees of success with composite as well as with conventional glass-ionomer cements, but the facility for repair of the new hybrids is not known. The objective of this study was to investigate the repairability of resin-modified glass-ionomer and polyacid-modified resin composite cements using two periods of aging prior to repair. Four different materials were used, Fuji IX, Fuji II LC, Vitremer and Dyract, under two different conditions of (1) repair after ten minutes or (2) seven days. Beam specimens of each material were prepared, aged and sectioned. The cut surfaces of the material were pretreated before newly mixed material was added to repair the specimen. Seven days after the repair was made, the flexural strength of the specimen was determined and compared to that of the seven days old unsectioned specimen. The fractured surfaces were viewed under the scanning electron microscope (SEM). Of the unrepaired specimens, Dyract had the highest flexural strength (MPa =90.0) and Fuji IX the lowest (MPa = 18.1) (P < 0.01). The flexural strengths of the repaired specimens were always lower than those of the unrepaired specimens, although for Fuji II LC these differences were not statistically significant (P > 0.05). Only the Fuji II LC specimens were insensitive to age of specimen when repaired. SEM analysis of the fracture surfaces showed either adhesive or cohesive failure depending upon the material under examination. Under the conditions of this study, Fuji IX and Dyract showed only a limited facility for repair, but a clinically viable repair or addition could be made on a Fuji II LC or Vitremer specimens.

Saudi Dental Journal 2003;15(3):123-130.