Interfacial morphology and bond strength of self-etching adhesives to primary dentin with or without acid etching.

The aim of the study was to determine the interfacial morphology and bond strength of three current self-etching adhesives (SEAs) to primary dentin and to evaluate the effect of introducing an additional step of phosphoric acid etching. Three human primary molars were assigned to each adhesive group for testing microtensile bond strength (microTBS) and three for studying interface morphology. Groups were: group 1, Excite, a total-etch adhesive (control); group 2, Adhese (ASE); group 3, Adper-Prompt-L-Pop (APLP), and group 4: Xeno III (XE) SEAs; groups 5-7 received application of 37% phosphoric acid for 15 s before applying ASE, APLP, and XE, respectively.

Cuspal flexure of teeth with composite restorations subjected to occlusal loading.

Purpose: To measure in vitro the cuspal deflection produced by polymerization shrinkage and occlusal loading in mesio-occlusal (MO) and mesio-occlusal-distal (MOD) bonded composite restorations.

Materials And Methods: Twenty first premolars were studied, attaching a small crystal ball to each cusp vertex as a reference point for intercuspal distance measurements. MO cavities were made in ten premolars and MOD cavities in the other ten.

Effects of etching time of primary dentin on interface morphology and microtensile bond strength.

Objectives: To determine the influence of different etching times (5, 15 or 30 s) on the morphology and micro-tensile bond strength (muTBS) of primary dentin.

Methods: For muTBS study, nine primary molars were randomly distributed in three experimental groups. Three Class I cavities per tooth were drilled and etched (37% orthophosphoric acid gel for 5, 15 or 30 s).