Relationship between quality of root canal obturation and periapical lesion in elderly patients: a systematic review.

Objective: The aim of this study was to investigate the relationship between quality of root canal obturations and the presence/absence of periapical lesion in elderly patients.

Methodology: This was a systematic conducted by means analysing studies on the quality of root canal obturations and their relationship with periapical health in elderly patients. The methodological procedures were based on Cochrane.

Preventive effect of a high fluoride toothpaste and arginine-carbonate toothpaste on dentinal tubules exposure followed by acid challenge: a dentine permeability evaluation.

Background: Considering the current high use of high fluoride toothpastes, the aim of the study was to quantify alterations in the root dentine permeability submitted to treatment with a high fluoride toothpaste and 8% arginine, calcium carbonate, sodium monofluorophosphate toothpaste as a preventive treatment for dentinal tubules exposure followed by acid challenge.

Methods: Thirty-third molars were sectioned below the cementoenamel. The root segments were connected to a hydraulic pressure apparatus to measure dentine permeability after the following sequential steps (n = 10 per group): I) Baseline; II) treatment with phosphoric acid for 30 s (maximum permeability); III) Toothbrushing (1 min) according to the experimental groups (G1- control; G2- 5000 ppm fluoride toothpaste; G3- 8% arginine-calcium carbonate toothpaste); IV) acid challenge for 5 min (orange juice).

Erosive potential of energy drinks on the dentine surface.

Background: Considering the current high consumption of energy drinks, the aim of the present study is to evaluate the influence of energy drinks in removing the smear layer and exposing dentinal tubules on root surface.

Methods: Dentine root surfaces were exposed using a diamond bur. Forty movements of scaling were performed in the area prepared in order to create a smear layer.

Influence of nicotine and cotinine impregnation on the first step of periodontal regeneration: clot stabilization.

This study analyzes the clot stabilization on root surfaces of teeth impregnated with cotinine and nicotine and the influence of the scaling in the adhesion of blood components, observing the influence of new exposition to nicotine and/or cotinine after scaling. Fifteen human teeth extracted due to periodontal disease of non-smokers patients were selected and manually scaled. Four dentin blocks were obtained from each tooth (n = 60).

Influence of concentration, time and method of application of citric acid and sodium citrate in root conditioning.

Objectives: The aim of this study was to establish the parameters of concentration, time and mode of application of citric acid and sodium citrate in relation to root conditioning.

Material And Methods: A total of 495 samples were obtained and equally distributed among 11 groups (5 for testing different concentrations of citric acid, 5 for testing different concentrations of sodium citrate and 1 control group). After laboratorial processing, the samples were analyzed under scanning electron microscopy.

Influence of dental exposure to oral environment on smear layer removal and collagen exhibition after using different conditioning agents.

Although in vitro studies have shown encouraging results for root surface conditioning with demineralizing agents, in vivo studies have failed to show its benefits in periodontal healing. This can be attributed to several factors, among which, the hypermineralization of dental surface. Therefore, this in vitro study compared, using scanning electron microscopy (SEM), the effect of root surface conditioning with different conditioners (1% and 25% citric acid, 24% EDTA and 50 mg/mL tetracycline hydrochloride) in impacted teeth and in teeth that had their roots exposed to the oral environment.

Smear layer removal for collagen fiber exposure after citric acid conditionings.

Aim: The aim of the present study was to compare the removal of the smear layer and exposure of collagen fibers of the root surface following the application of five citric acid solution concentrations.

Methods And Materials: Two hundred seventy (270) samples were equally divided into six groups (n=45) for treatment with saline solution (control) and five different concentrations of citric acid (0.5, 1, 2, 15, and 25 percent).

The use of celecoxib and dexamethasone for the prevention and control of postoperative pain after periodontal surgery.

Background: Conventional non-steroidal anti-inflammatory drugs have been widely used in the control of postoperative pain, but sparse information is available on the efficacy of celecoxib, a selective cyclooxygenase-2 inhibitor, or dexamethasone, a steroidal anti-inflammatory drug, after periodontal surgeries. The purpose of the present study was to compare the use of celecoxib and dexamethasone in the management of pain after mucoperiosteal flap surgery.

Methods: A randomized double-masked cross-over clinical trial was conducted on 20 patients from 27 to 52 years old with generalized moderate to advanced chronic periodontitis.