Alan Furness1, Marko Yousef Tadros2, Stephen W Looney3, Frederick A Rueggeberg4. 1. Department of Oral Rehabilitation, College of Dental Medicine, United States. Electronic address: afurness@gru.edu. 2. College of Dental Medicine, United States. 3. Department of Biostatistics and Epidemiology, Medical College of Georgia, United States. 4. Department of Oral Rehabilitation, College of Dental Medicine, United States.
Abstract
OBJECTIVES: To examine the effects of composite type (bulk-fill/conventional) and placement (4-mm bulk/2-mm increments) on internal marginal adaptation of Class I preparations. METHODS: Cylindrical, Class I, 4-mm×4-mm preparations were made on 50 recently extracted human molars and restored using either a bulk-fill (SureFil SDR Flow (SDR), Quixx (QX), SonicFill (SF), Tetric EvoCeram Bulk (TEC)) or a conventional composite designed for 2-mm increments (Filtek Supreme Ultra (FSU)). Restorations were placed in 1 or 2 increments using the manufacturer's bonding agent and curing light (n=5). Teeth were sectioned occluso-gingivally and dye was placed on the internal margin and visually examined by 3 observers. Gap-free marginal lengths were analysed within three different regions of the sectioned tooth: enamel, mid-dentine, and pulpal floor. RESULTS: Marginal integrity was unaffected by placement method. Bulk-placement demonstrated significantly fewer gap-free margins at the pulpal floor than in enamel, for all materials except SDR. Greater percentages of gap-free margins were found within the mid-dentine than at the pulpal floor for FSU. QX had more gap-free margins in enamel compared with the mid-dentine. Proportion of gap-free margins within enamel and mid-dentine was not significantly different for any incrementally placed product. Excluding FSU, gap-free margins within enamel were significantly greater than at the pulpal floor. Notably, significantly more gap-free margins were found within mid-dentine than at the pulpal floor for SF. CONCLUSIONS: No significant differences in gap-free margins were found between placement methods within a given product per location. Except for SDR, percentage of gap-free margins was significantly lower at the pulpal floor interface than at the enamel interface for bulk-fill. Published by Elsevier Ltd.
OBJECTIVES: To examine the effects of composite type (bulk-fill/conventional) and placement (4-mm bulk/2-mm increments) on internal marginal adaptation of Class I preparations. METHODS: Cylindrical, Class I, 4-mm×4-mm preparations were made on 50 recently extracted human molars and restored using either a bulk-fill (SureFil SDR Flow (SDR), Quixx (QX), SonicFill (SF), Tetric EvoCeram Bulk (TEC)) or a conventional composite designed for 2-mm increments (Filtek Supreme Ultra (FSU)). Restorations were placed in 1 or 2 increments using the manufacturer's bonding agent and curing light (n=5). Teeth were sectioned occluso-gingivally and dye was placed on the internal margin and visually examined by 3 observers. Gap-free marginal lengths were analysed within three different regions of the sectioned tooth: enamel, mid-dentine, and pulpal floor. RESULTS: Marginal integrity was unaffected by placement method. Bulk-placement demonstrated significantly fewer gap-free margins at the pulpal floor than in enamel, for all materials except SDR. Greater percentages of gap-free margins were found within the mid-dentine than at the pulpal floor for FSU. QX had more gap-free margins in enamel compared with the mid-dentine. Proportion of gap-free margins within enamel and mid-dentine was not significantly different for any incrementally placed product. Excluding FSU, gap-free margins within enamel were significantly greater than at the pulpal floor. Notably, significantly more gap-free margins were found within mid-dentine than at the pulpal floor for SF. CONCLUSIONS: No significant differences in gap-free margins were found between placement methods within a given product per location. Except for SDR, percentage of gap-free margins was significantly lower at the pulpal floor interface than at the enamel interface for bulk-fill. Published by Elsevier Ltd.
Authors: Vilhelm G Ólafsson; André V Ritter; Edward J Swift; Lee W Boushell; Ching-Chang Ko; Gabrielle R Jackson; Sumitha N Ahmed; Terence E Donovan Journal: J Esthet Restor Dent Date: 2017-10-16 Impact factor: 2.843