IADR Abstract Archives
Interaction of an Experimental Universal Adhesive with Caries-Affected Dentin
Objectives: Objectives: In order to minimize the loss of healthy tooth structure, there is a growing trend toward less invasive preparation techniques, where caries-infected dentin (CID) is removed, and caries-affected dentin (CAD) is left behind.
Aim of this study was to assess shear bond strength (SBS) and hybrid layer (HL) formation of an experimental universal adhesive (ADH-XTE, 3M) on human CAD.
Methods: Methods: Extracted human molars with dentin caries having a mostly flat lesion bottom were embedded in cold-cure acrylic resin and ground on a lapidary wheel, close to the lesion bottom. Remaining CID was removed with a polymer bur (SmartBurTM II, SS White), to expose CAD. SBS (n=7) according to ISO29022:2013 to CAD and sound human dentin (SD) was measured for ADH-XTE in self-etch (SE) and total etch (TE) modes, using a Zwick Z010 testing machine. SBS of ScotchbondTM Universal (SBU, 3M) to SD was determined as control. FiltekTM Z250 (3M) was used as composite.
HL formation on CAD and SD was investigated using scanning electron microscopy (SEM, Auriga, Zeiss).
Results: Results: The table shows SBS [MPa], and approximate HL thickness [µm] for SE and TE modes. Standard deviations (STD) are given in parentheses. SBS data were analyzed by ANOVA and multiple comparisons using the Tukey test (p<0.05). Means with the same letters are statistically the same.
Distinct HL were found with an approximate thickness of <1µm for SE and 5µm for TE samples, irrespective of CAD or SD substrate. No voids or gaps were found in HL indicating full resin impregnation of the HL.
Conclusions: Conclusions: No statistically significant differences were found for SBS. ADH-XTE afforded in both etching modes similar SBS to CAD and SD as the control SBU to SD. Fully resin impregnated HL were found with a thickness depending predominantly on the etching mode.
Aim of this study was to assess shear bond strength (SBS) and hybrid layer (HL) formation of an experimental universal adhesive (ADH-XTE, 3M) on human CAD.
Methods: Methods: Extracted human molars with dentin caries having a mostly flat lesion bottom were embedded in cold-cure acrylic resin and ground on a lapidary wheel, close to the lesion bottom. Remaining CID was removed with a polymer bur (SmartBurTM II, SS White), to expose CAD. SBS (n=7) according to ISO29022:2013 to CAD and sound human dentin (SD) was measured for ADH-XTE in self-etch (SE) and total etch (TE) modes, using a Zwick Z010 testing machine. SBS of ScotchbondTM Universal (SBU, 3M) to SD was determined as control. FiltekTM Z250 (3M) was used as composite.
HL formation on CAD and SD was investigated using scanning electron microscopy (SEM, Auriga, Zeiss).
Results: Results: The table shows SBS [MPa], and approximate HL thickness [µm] for SE and TE modes. Standard deviations (STD) are given in parentheses. SBS data were analyzed by ANOVA and multiple comparisons using the Tukey test (p<0.05). Means with the same letters are statistically the same.
Distinct HL were found with an approximate thickness of <1µm for SE and 5µm for TE samples, irrespective of CAD or SD substrate. No voids or gaps were found in HL indicating full resin impregnation of the HL.
Conclusions: Conclusions: No statistically significant differences were found for SBS. ADH-XTE afforded in both etching modes similar SBS to CAD and SD as the control SBU to SD. Fully resin impregnated HL were found with a thickness depending predominantly on the etching mode.