title: The influence of the cavity preparation design on marginal accuracy of laboratory-processed resin composite restorations.
abstract: The aim of this study was to evaluate the influence of different cavity preparation designs on marginal accuracy of laboratory-processed resin composite restored teeth. Eighty mandibular human third molars were selected. There were two experimental factors, occlusal isthmus width (narrow vs wide) and cuspal coverage (inlay, one-cusp onlay, two-cusp onlay, and all-cusp onlay), resulting on eight groups (N = 10). Indirect composite restorations (SR Adoro, Ivoclar-Vivadent) were manufactured and positioned over each respective preparation. Marginal accuracy evaluation was accomplished using a stereomicroscope at three points on buccal, lingual, mesial, and distal regions with 40x magnification. The results showed significant differences (P = 0.00) with wide inlay showing the best overall marginal accuracy and narrow inlay the worst one. Two-way analysis of variance (ANOVA) showed significant differences when considering the factor occlusal isthmus width (P = 0.00). In general, preparations with wide occlusal isthmus presented better results than narrow ones, except for wide all-cusp onlays; however, the test failed to show differences when considering the cuspal coverage (P = 0.42) or the interaction between both factors (P = 0.30). The effect of occlusal width extension on marginal accuracy of indirect composite resin restorations is significant, with lower values of gaps width in wide preparations, but since in a clinical situation this would mean greater removal of sound tooth structure, less-aggressive preparations combined with other restorative procedures seem to be more feasible.
authors: Department of Dental Materials, Piracicaba Dental School, University of Campinas, Campinas, Brazil.
authors: Rodrigo Borges
authors: RB
authors: Fonseca
authors: Lourenço
authors: L
authors: Correr-Sobrinho
authors: Alfredo Júlio
authors: AJ
authors: Fernandes-Neto
authors: Paulo Sérgio
authors: PS
authors: Quagliatto
authors: Carlos José
authors: CJ
authors: Soares
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003737:Dental Cavity Preparation / Q000145:classification / Q000379:methods*; D003761:Dental Impression Technique; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods*; D006801:Humans; D007284:Inlays / Q000145:classification; D008422:Materials Testing; D008964:Molar, Third; D013499:Surface Properties
chemical_list: D003188:Composite Resins
references: J Dent Res. 1998 Jun;77(6):1435-45
references: 9649172
references: Clin Oral Investig. 2003 Jun;7(2):71-9
references: 12740693
references: Acta Odontol Scand. 1995 Feb;53(1):24-8
references: 7740927
references: J Oral Rehabil. 1997 Sep;24(9):646-51
references: 9357744
references: J Esthet Restor Dent. 2005;17(4):224-35
references: 16231493
references: Oper Dent. 2000 Nov-Dec;25(6):549-55
references: 11203869
references: J Prosthet Dent. 1989 Oct;62(4):405-8
references: 2685240
references: J Dent. 1992 Feb;20(1):18-26
references: 1548381
references: Dent Mater. 2003 Jul;19(5):393-8
references: 12742434
references: Oper Dent. 2003 Nov-Dec;28(6):689-94
references: 14653281
references: J Prosthet Dent. 2006 Jun;95(6):421-9
references: 16765154
references: Dent Mater. 2005 Jan;21(1):56-67
references: 15681003
references: J Dent. 2004 Feb;32(2):109-15
references: 14749082
references: Oper Dent. 2003 Mar-Apr;28(2):127-35
references: 12670067
references: Dent Mater. 2004 Jan;20(1):3-11
references: 14698768
references: J Oral Rehabil. 2004 Apr;31(4):393-7
references: 15089948
references: J Prosthet Dent. 2001 Apr;85(4):386-95
references: 11319537
references: Curr Opin Dent. 1991 Apr;1(2):172-8
references: 1777662
references: J Prosthet Dent. 2003 Nov;90(5):459-64
references: 14586310
references: Int J Prosthodont. 2004 May-Jun;17(3):313-7
references: 15237878
references: J Dent. 1994 Jun;22(3):147-53
references: 8027457
references: Eur J Prosthodont Restor Dent. 1998 Jun;6(2):55-62
references: 9927920
references: J Dent. 1993 Oct;21(5):265-73
references: 8227687
references: Quintessence Int. 1994 Jan;25(1):53-8
references: 8190882
references: J Dent. 1992 Jun;20(3):131-9
references: 1624616
references: J Prosthet Dent. 2005 Feb;93(2):138-42
references: 15674223
references: J Endod. 1999 Jan;25(1):6-8
references: 10196835
references: J Prosthet Dent. 2000 Apr;83(4):466-73
references: 10756298
references: Br Dent J. 1971 Aug 3;131(3):107-11
references: 5283545
references: J Prosthet Dent. 2000 Jan;83(1):40-9
references: 10633021
references: J Prosthet Dent. 2002 Oct;88(4):388-95
references: 12447215
references: J Prosthet Dent. 2004 Jun;91(6):554-60
references: 15211298
references: J Oral Rehabil. 1999 Jul;26(7):582-93
references: 10445478
references: Quintessence Int. 1996 Feb;27(2):115-21
references: 9063222
references: Oper Dent. 1993 Nov-Dec;18(6):230-6
references: 8152995
references: J Am Dent Assoc. 1993 Dec;124(12):48-54
references: 8277057
references: J Am Dent Assoc. 1989 Jun;118(6):703-7
references: 2738247
references: J Dent. 1992 Jun;20(3):171-7
references: 1624622
references: J Prosthet Dent. 1980 Apr;43(4):419-22
references: 6928479
references: J Prosthet Dent. 1994 Sep;72(3):233-44
references: 7965895
references: Oper Dent. 2005 May-Jun;30(3):389-94
references: 15986961
references: Dent Mater. 2005 Jan;21(1):36-42
references: 15681000