The Effect of Light Exposure on Water Sorption and Solubility of Self-Adhesive Resin Cements.

Purpose. To investigate the effect of light activation on the water sorption (WS) and solubility (SL) of resin cements after 24 h and 7 days. Methods.

Thermal and mechanical load cycling on microleakage and shear bond strength to dentin.

This study evaluated the influence of mechanical and thermal cycling on microleakage at the cervical margins of proximal slot restorations and shear bond strength on flat dentin surfaces. Microleakage Evaluation: One hundred and twenty slot cavity restorations were performed on bovine incisors. The restorations were randomly divided into four groups (n = 30): control (no thermal and mechanical load cycling), thermal cycling (2,000 cycles, 5 degrees C-55 degrees C), mechanical load cycling (50,000-80N) and thermal and load cycling (2,000 5 degrees C-55 degrees C/50,000-80N).

Influence of polymerization technique on microleakage and microhardness of resin composite restorations.

This study evaluated the influence of three polymerization techniques on microleakage and microhardness of Class II restorations using a microhybrid (Filtek Z250) and a "packable" resin composite (SureFil). The techniques, their respective light intensities and time used in relation to the resin composites, are: Conventional (C)--800 mW/cm2 for 40 seconds; Soft-Start (SS1)--75 mW/cm2 for 10 seconds plus 518mW/cm2 for 30 seconds; Soft-Start (SS2)-- 170mW/cm2 for 10 seconds plus 518 mW/cm2 for 30 seconds and Plasma Arc Curing (PAC)--1,468 mW/cm2 for three or six seconds. One hundred and fifty-two "Vertical Slot type Class II cavities" at the mesial and distal surfaces were prepared and divided into eight groups (n = 19).

Influence of resin composite polymerization techniques on microleakage and microhardness.

Objective: The purpose of this study was to evaluate the marginal microleakage and the extent of polymerization in Class II resin composite restorations prepared with two restorative techniques and two polymerization systems. METHOD AND MATERIALS One hundred twenty Class II cavities were prepared in bovine teeth and randomly divided into four groups: Bulk placement and conventional polymerization (Conv 1); buccolingual increments and conventional polymerization (Conv 3); bulk placement and soft-start polymerization (Soft 1); buccolingual increments and soft-start polymerization (Soft 3). All cavities were restored with the Z100/Single Bond system.

[Effect of techniques of composite resin insertion and polymerization on microleakage and microhardness].

The aim of this study was to evaluate the influence of techniques of composite resin polymerization and insertion on microleakage and microhardness. One hundred and eighty class II cavities were prepared in bovine teeth and assigned to six groups: G1 - bulk filling + conventional polymerization; G2 - bucco-lingual increments + conventional polymerization; G3 - bulk filling + soft-start polymerization; G4 - bucco-lingual increments + soft-start polymerization; G5 - bulk filling + progressive polymerization; G6 - bucco-lingual increments + progressive polymerization. All cavities were restored with the Z100/Single Bond system (3M).

Evaluation of microleakage in cervical margins of various posterior restorative systems.

Purpose: The purpose of this in vitro study was to evaluate the microleakage and dye penetration patterns of various restorative systems in the cervical margins of Class II cavities using the dye penetration technique.

Materials And Methods: Ninety bovine incisors were selected and part of the crown was sectioned producing a standardized occlusogingival margin of 4 mm. Standardized Class II box cavities were designed on the mesial (MO) and distal (OD) surfaces with the gingival margin in dentin.