In-vitro effects of novel periodontal scalers with a planar ultrasonic piezoelectric transducer on periodontal biofilm removal, dentine surface roughness, and periodontal ligament fibroblasts adhesion.

Objectives: To compare ultrasonic scaler prototypes based on a planar piezoelectric transducer with different working frequencies featuring a titanium (Ti-20, Ti-28, and Ti-40) or stainless steel (SS-28) instrument, with a commercially available scaler (com-29) in terms of biofilm removal and reformation, dentine surface roughness and adhesion of periodontal fibroblasts.

Materials And Methods: A periodontal multi-species biofilm was formed on specimens with dentine slices. Thereafter specimens were instrumented with scalers in a periodontal pocket model or left untreated (control).

Effect of adrenaline and noradrenaline on biofilm formation and virulence factors of Streptococcus mutans UA159.

Objectives: To evaluate in vitro the effects of adrenaline and noradrenaline on the biofilm formation on orthodontic brackets, acid production and expression of virulence genes of Streptococcus mutans UA159 (S. mutans).

Design: S.

In Vitro Effects of Arginine-Containing Toothpastes on Cariogenic Biofilms.

Purpose: The effects of arginine as a toothpaste additive were assessed on oral streptococci with and without a known arginine deiminase system (ADS) and cariogenic biofilms.

Materials And Methods: Suspensions of Streptococcus mutans, S. sobrinus and the ADS-positive (ADS+) S.

Effect of Er:YAG Laser on Different Single and Mixed Microorganisms Being Associated with Endodontic Infections.

The purpose of this study was to evaluate the antimicrobial effect of activated irrigation with different modes of erbium-doped yttrium aluminum garnet (Er:YAG) laser application on microorganisms related to secondary endodontic infection. Er:YAG laser has been recommended as an adjuvant tool for root canal disinfection during endodontic treatment. Laser-activated irrigation (LAI) with 300 or 600 μm tips were tested with or without intermittent irrigation with 0.

Effect of articaine on mental nerve anterior portion: histological analysis in rats.

Objectives: The aim of this study was to evaluate the possible toxic effects of articaine and lidocaine on mental nerve, due to the increasing number of paresthesia cases after nerve blocks.

Materials And Methods: The drugs were injected in the anterior portion of mental nerve of 24 rats, divided into three groups: G1--4% articaine with 1:100,000 epinephrine; G2--2% lidocaine with 1:100,000 epinephrine and G3--plain 1:100,000 epinephrine solution. These solutions were injected in the right side of the rat's mandible and the left side was used as control (0.

The influence of local anesthetic solutions storage on tissue inflammatory reaction.

Objective: This study aimed to analyze the influence of storage conditions of local anesthetic solutions in the inflammatory reaction after injection in rats.

Study Design: Twenty-four rats received in their oral mucosa the injection of 2% lidocaine with epinephrine 1:100.000 solutions (LA) submitted to the following storage conditions during a twelve-month period: G1--inside the original packaging, in refrigerator (5±1°C); G2--inside the original box, under light shelter, at room temperature; G3--outside the original box at room temperature (exposed to artificial light for 12 hours/day) and G4--brand new solution.

Anesthetic efficacy of articaine and lidocaine for incisive/mental nerve block.

Introduction: The incisive/mental nerve block (IMNB) could be an alternative to the inferior alveolar nerve block in the mandibular anterior teeth. The effectiveness of articaine has not been tested in IMNB.

Methods: This prospective randomized double-blind crossover study compared the anesthetic efficacy of 0.