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Flexural strength of the human dentin decreases after it is demineralized in vitro. This in vitro study demonstrates that resin-modified glass ionomer (RMGI) containing bioactive glass (BAG) can compensate for this loss of strength. RMGI without BAG does not restore the strength of such demineralized dentin.

Under clinical conditions, posterior direct nanofilled composites and indirect composite inlay systems have the potential to present a high success rate and were clinically satisfactory at five years postplacement.

After five minutes of curing, the change in the organic matrix of the resin composite using silorane has a positive effect on controlling the cumulative cuspal deflection.

CLINICAL TECHNIQUE/CASE REPORT

This case report will describe and show in detail all the clinical and laboratory steps involved with the vented cast gold crown utilizing an external vent or escape channel.

Proper configuration of the proximal surface of a Class II composite restoration is essential for the preservation of dental and periodontal tissues and subsequent long-term success. Adequately customized or designed wedges can assist in reproducing an imitation of natural form in the interproximal area and ensure sufficient contact tightness with the adjacent tooth.

CLINICAL RESEARCH

Improvement of the marginal seal of restoration defects is a conservative approach that may improve their quality over time. Minimally invasive treatments of defective restorations showed similar outcome to replaced restorations after five years.

The clinical effectiveness of three different adhesive systems including a self-etching and two etch-and-rinse adhesives was acceptable in noncarious cervical lesions subsequent to 18-month evaluation.

There was no significant decrease in mean dentin fracture toughness after 10% and 15% carbamide peroxide bleaching in situ. This provides some reassurance that dentin is not overtly weakened by the bleaching protocol used in this study.

Etching of enamel with either acid or laser provides similar clinical performance of fissure sealants.

LABORATORY RESEARCH

The irradiation technique, used to measure mechanical properties of resin-based composites according to international standards, consistently differs from clinically simulated conditions, calling into question whether laboratory findings can be unrestrictedly applied clinically, especially at short polymerization times. The study analyzes whether degree of conversion measurements at short post-polymerization time (five minutes) are able to predict the long-term material behavior.

In case the veneering ceramic of a zirconia-based restoration fractures in the mouth to expose the zirconia coping, a phosphate/carboxylate monomer–based primer may be a good adhesion enhancer to repair the fracture.

The use of a linear low-density polyethylene wrap as advocated in the sealed bleaching technique can minimize hydrogen peroxide penetration into the pulp cavity without compromising bleaching efficacy in vitro.

Self-adhesive resin cements demonstrated superior bond strength to a variety of prosthodontic substrates relative to resin-modified glass ionomer cement, indicating that they are able to provide a wider array of clinical applications. However, selection of the cement should be determined largely by the type of substrate and setting reaction.

Considering the difficulties in detecting buccal recurrent caries under restorations due to the compression of structures in intraoral radiography and occurrence of metal artifacts in cone beam computed tomography (CBCT), it is clinically useful to assess the performance of intraoral film and digital radiography and two different CBCT systems in terms of the visibility of artificial buccal secondary caries lesions under various restorative materials.

The current results indicate that acid etching is a better option than air abrasion when bonding IPS e.max Press ceramic to dual-cure RelyX ARC resin cement. However, both fatigue and thermocycling decrease the bond strength.

Although daily toothbrushing immediately after bleaching increased enamel surface roughness, postponing the procedure for one or two hours after daily bleaching resulted in no changes in enamel surface roughness.

Laboratory wear testing of resin composites provides valuable information for clinicians in selecting materials for clinical use.

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