Evaluation of material waste, dimensional stability, and detail reproduction of polyvinyl siloxane impression materials mixed with different mixing tips.

Statement Of Problem: Redesigned mixing tips, promising less impression material waste, have been marketed. However, whether their use adversely affects the dimensional stability and detail reproduction of the impression material is unclear.

Purpose: The purpose of this in vitro study was to evaluate the dimensional stability, detail reproduction, and material waste of different polyvinyl siloxane impression materials (regular and light-body) mixed with 2 different mixing tips (MIXPAC T-Mixer mixing tip and MIXPAC helical mixing tip).

Decomposition Rate, pH, and Enamel Color Alteration of At-Home and In-Office Bleaching Agents.

This study evaluated the decomposition rate (DR), pH, enamel color alteration (DE) and whiteness index (DWI) promoted by at-home and in-office bleaching. Enamel surface was submitted to (n=10): at-home (10%, 15%, 20% carbamide peroxide - CP, 6% hydrogen peroxide -HP) and three 35% HP agents with light irradiation (LED, laser, and halogen) or no treatment (control). The DR and pH of agents were measured after 0, 2, 4, 6 and 8 h (at-home) or after 5, 15, 20, 30 and 40 min (in-office).

Use of modified lip repositioning technique associated with esthetic crown lengthening for treatment of excessive gingival display: A case report of multiple etiologies.

Excessive gingival display during smile can result in compromised esthetics. This study aims to report a case of excessive gingival display with multiple etiologies treated by means of modified lip repositioning technique associated with esthetic crown lengthening. A 23-year-old female patient, with 5-mm gingival display during smile caused by altered passive eruption and hypermobility of the upper lip, underwent the modified lip repositioning technique associated with gingivectomy followed by flap elevation and ostectomy/osteoplasty.

Aesthetic crown lengthening: periodontal and patient-centred outcomes.

Aim: The objective of this prospective study was to assess clinical and patient-centred outcomes of aesthetic crown lengthening surgery for the treatment of altered passive eruption.

Materials And Methods: Twenty-two patients were treated and followed up for 6 months. The evaluated clinical parameters included, among others, probing depth, clinical attachment level, clinical crown length (CLc ), cemento-enamel junction to alveolar bone crest distance, gingival width (GW) and gingival display (GD).

Giant complex odontoma in maxillary sinus.

In this manuscript, we present a rare case report of giant complex odontoma in the maxillary sinus, where the applied therapy included complete excision of the lesion with a conservative approach. Odontomas are also called benign growth abnormalities or hamartomas. They represent a more common type of odontogenic tumor and are related to various disorders such as bad dental placements, expansion, increased volumetric bone, and no eruption of permanent teeth.

Analysis of bond strength by pull out test on fiber glass posts cemented in different lengths.

Background: The aim of this study was to evaluate, by means of pull-out test, the bond strength of fiberglass posts when cemented with different lengths in endodontically treated teeth.

Materials And Methods: Sixty single-rooted bovine roots were cut in the cementoenamel junction with 21 mm length. They were endodontically treated and randomly divided into three groups (n = 20).

Evaluation of the effects of periodontal treatment on levels of ascorbic acid in smokers.

Smokers consistently have lower levels of vitamin C, which is important for optimal healing, especially following invasive procedures. Some studies demonstrated that patients undergoing surgery experience significant reductions in systemic vitamin C levels, presumably due to higher metabolic utilization of existing vitamin pools. However, there appear to be no studies evaluating the effect of non-surgical periodontal therapy on plasma levels of vitamin C.

Clinical evaluation of in-office dental bleaching treatments with and without the use of light-activation sources.

This study clinically evaluated the alteration of color, color stability, dental sensitivity and gingival irritation on patients undergoing dental bleaching using varying bleaching methods and light-activation sources. According to pre-established criteria, 40 patients were selected and randomly divided into four groups (n=10): Group 1--35% Hydrogen Peroxide (HP); Group 2--35% HP plus Halogen Curing Light XL 3000 (3M/ESPE); Group 3--35% HP plus Demetron LED (Kerr) and Group 4--35% HP plus LED/LASER (Bio-art). For all groups, there were two sessions of bleaching with 35% HP, with a one week break between sessions.

Interfacial morphology of self-etching adhesive systems in dentin.

Objective: To portray and assess the interfacial morphology achieved with self-etching systems in dentin under observation by scanning electron microscopy.

Method And Materials: Ten caries-free extracted erupted human third molars were used in this study. The occlusal enamel was removed, and 10 dentin disks with a thickness of 800 +/- 200 Microm were obtained by slow-speed sectioning with a diamond saw parallel to the occlusal surface.

Effect of placement techniques on the marginal adaptation of Class V composite restorations.

Statement Of The Problem: Several techniques are proposed for the restoration of Class V cavities but there is no agreement in the literature as to which technique is more effective.

Purpose: To evaluate the effect of different techniques of composite increment placement on the marginal adaptation of Class V restorations.

Methods And Materials: Twenty-four human molars were selected and prepared with standardized saucer-shaped cavity dimensions of 3.

Flowable composites as "filled adhesives:" a microleakage study.

Objective: The purpose of this in vitro study was to investigate the microleakage at dentin margins of a flowable resin composite associated with an adhesive, either light cured separately or co-cured, in Class V cavities.

Materials And Methods: Twenty four recently extracted human molars were prepared with standardized box-shaped Class V cavities of 3.0 mm (mesial-distal), 2.

Composite bond strength to enamel with self-etching primers.

This study compared the shear bond strength (SBS) to enamel of five self-etching primer/adhesive systems and one total-etch, one-bottle adhesive system. Sixty freshly extracted bovine incisors were mounted, polished to 600-grit and randomly assigned to six groups (n=10): Adper Prompt Self-Etch (AD), OptiBond Solo Plus Self-Etch (OP), AdheSE (AS), Tyrian (TY) and Clearfil SE Bond (SE) as self-etching systems; and Single Bond (SB) as a total-etch system (control). The respective hybrid composite was applied in a #5 gelatin capsule and light-cured.