Aim: To determine periodontal status of fixed single prostheses (FSP) installed in 2013 at Austral University of Chile, and its contralateral homologue (CH). Methods: A group of patients with FSP installed during 2013, who met the selection criteria and agreed to participate in the study were evaluated. Probing depth, attachment level; bleeding on probing and dental plaque index for each FSP and CH were measured in 2014; biological width invasion was also evaluated. One FSP and one CH were measured per patient, and in 6 sites for each tooth. Results: Seventy-four patients were evaluated. The majority were women (73%); posterior teeth accounted for 63.5%. The majority of participants had history of previous periodontal disease (85.1%), of which 58.7% was Periodontitis. Six of the patients with a history of gingivitis progressed to periodontitis (23.07%); while 100% of patients with no history of periodontal disease maintained their condition. Only 4 of the FSP evaluated showed biological invasion width. Discussion: Similar results were found for FSP and CH teeth with respect to probing depth, clinical attachment level and bleeding on probing. However, a difference in relation to dental plaque index was observed: positive in 58.1% CH and positive in 29.7% FSP. Under the conditions of this study, it is concluded that the periodontal status of teeth with FSP does not differ from CH.

Sonic versus ultrasonic activation for the cleaning of the root canal after post space preparation: an in vitro study. Cite as: Carrasco R, Román R, Ojeda M & Vergara C. Sonic versus ultrasonic activation for the cleaning of the root canal after post space preparation: an in vitro study. J Oral Res 2015; 4(4): 255-262.Abstract: Objective: To compare the efficacy of 3 intracanal cleaning protocols used before cementation of prosthetic posts. Material and Methods: 40 anterior teeth received endodontic treatment in hand, using lateral condensation technique. After two weeks, gutta-percha was appropriately removed from the teeth to get the necessary space to install a post. Then, teeth were randomly divided into groups; root surface was treated with chlorhexidine (CHX) activated by ultrasound (US) (group I), with chlorhexidine activated by sonic instrumentation (S) (group II), chlorhexidine without activation (group III) and without treatment (group IV). All teeth were fractured longitudinally getting 2 sections. The middle third of the root canal was microphotographed with a scanning electron microscope (SEM) and the contaminated surface was measured using detritus with ImageJ 1.47. INTRODUCTION.Endodontically treated teeth usually require a post inside the root canal to retain a coronal restoration 1 . Fiber posts offer advantages over metal posts, such as favorable fracture patterns that could be restored because they are less rigid, and because they provide an easy removal of the post from the root canal in case of repeated endodontic treatment 2 .Various resin cements are used for bonding fiber posts. The method of application involves multiple steps, and is rather complex and dependent on the technique used by the dentist, and therefore it may affect the quality of the adhesion 3 .Manufacturers suggest removing detritus or debris from tooth surfaces by using ultrasound or pumice. They also suggest keeping tooth surface clean with ethanol, citric acid, ethylenediaminetetraacetic acid (EDTA) or phosphoric acid to improve adhesion and eliminate any residue 4 .However, surface treatments with different root dentin agents can cause changes in its chemical and structural composition, which in turn, may alter its permeability and solubility characteristics 5 .It is important to have in mind that the penetration of irrigation in the canal depends on the anatomy of the root canal, on the irrigant application techniques, the volume of the solution, instrumentation of the root canal and physicochemical characteristics of the irrigant 6 . The- of the treated dentin.Cecchin et al. 7 compared bond strength and fracture patterns between experimental groups irrigated with chlorhexidine (CHX), under different application times (30, 60, and 120 seconds) and a control group irrigated with saline. Significant differences for both fracture patterns and bond strength were observed. They concluded that the use of CHX pretreatment could preserve the bond strength of the fiber post for 12 months using resin cement, regardless of the ...