Osvaldo Zmener - Academia.edu (original) (raw)

Papers by Osvaldo Zmener

Revista de la Asociación Odontológica Argentina, Mar 20, 2018

Revista de la Asociación Odontológica Argentina, Dec 20, 2013

Rev. Asoc. Odontol. Argent, 2014

American journal of dentistry, 2019

PURPOSE To compare the sealing properties of three pit and fissure (P&F) sealants, Embrace Wet Bo... more PURPOSE To compare the sealing properties of three pit and fissure (P&F) sealants, Embrace Wet Bond (EWB), a bioactive P&F sealant Embrace Wet Bond through the addition of modified calcium phosphate (MCP) (EWBMCP) and ClinPro (CLPR). The sealing properties of the materials were tested by means of a bacterial microleakage test. METHODS 30 extracted intact human third molars were randomly assigned to three groups of 10 (n=10) teeth each. The teeth were cleaned with two passes of air abrasion, followed by rinsing for 20 seconds and then dried with compressed air for another 20 seconds leaving the enamel surface slightly moist. The coronal portion of each tooth was sectioned perpendicular to the long axis at the level of 4 mm below the top of the central fossa of the enamel. A parallel vertical channel 1 mm in diameter was prepared in the central fossa through the entire sample. All samples were sterilized with Gamma radiation. After etching the occlusal surface with 35% phosphoric acid...

Journal of Endodontics, 1980

International Endodontic Journal, 2003

In this study a new epoxy-resin-based endodontic sealer, AH Plus, was tested in vitro for apical ... more In this study a new epoxy-resin-based endodontic sealer, AH Plus, was tested in vitro for apical leakage. The conventional sealer AH26, for which information is already available, was used as the control. The root canals of 72 single-rooted teeth were prepared biomechanically using a stepback technique before lateral condensation of gutta-percha with one of the two sealers. Teeth were immersed in 5% methylene blue dye for 2, 4 or 10 days. The roots were split longitudinally so that the extent of dye penetration could be measured with a stereomicroscope. The mean extent at 2 days was 0.4 mm for AH26 and 1.4 mm for AH Plus. Neither material produced a complete apical seal and leakage increased with the duration of immersion in dye. The differences between observation periods as well as between materials with respect to dye penetration were statistically significant ANOVA, (P < 0.005).

Oral Health and Dental science

Background: Osteoporosis is a metabolic bone disease, which impairs and/or delays the regenerativ... more Background: Osteoporosis is a metabolic bone disease, which impairs and/or delays the regenerative response of calcified tissues. Aim: The aim of this study was to assess the histopathologic response to direct pulp capping in osteoporotic rats that received a preoperative treatment with Zoledronic acid, a bisphosphonate which is currently prescribed for treating osteoporosis. Methodology: Two groups, each with 7 osteoporotic female Wistar rats (n=7) received either an intravenous dose of 100 mg/kg of Zoledronic Acid (Group 1) or the same volume of sterile saline (Group 2). One week later, the pulps of the right and left mandibular first molars of each animal were exposed and capped with Biodentine. After 20 days the animals in Group 1 received a second similar dose of Zoledronic acid and Group 2 a similar second dose of sterile saline. After 38 days the animals were euthanized and a total of 28 teeth (14 per group) were prepared for histologic analysis evaluating the following param...

Rev. Asoc. Odontol. Argent, 2012

Revista de la Asociación Odontológica Argentina, Dec 15, 2011

Dental Traumatology, 1991

This case report describes a radiographical, histological and histochemical study of an extracted... more This case report describes a radiographical, histological and histochemical study of an extracted mandibular tooth with progressive external root resorption. The cells which appeared to be responsible for the hard tissue resorption showed an intense acid phosphatase activity, similar to that of bone‐resorbing cells. Some aspects on the etiology and pathogenesis of resorptive process that occurred in the present case are discussed.

Acta odontológica latinoamericana, Apr 29, 2022

The aim of this study was to compare the capacity of two reciprocating NiTi instruments in removi... more The aim of this study was to compare the capacity of two reciprocating NiTi instruments in removing gutta-percha/sealer material from simulated curved root canals (SCRC). The time required for filling material removal was also recorded. Twenty SCRCs were divided into two groups of 10 (n=10) samples each. In Group 1, the SCRC were prepared to a R25 Reciproc Blue instrument (RCPB; VDW, Munich, Germany). In Group 2 the SCRC were prepared to a Primary WaveOne Gold instrument (PWOG; Dentsply, Ballaigues, Switzerland). In both groups, the canals were filled with matched-taper single gutta-percha cones and AH Plus sealer. Filling materials were removed with R25 RCPB (Group 1) and PWOG (Group 2). The amount of remaining gutta-percha/sealer was calculated at three predetermined levels of evaluation located at 2, 6 and 10 mm from the WL and expressed in percentages. Canals retreated with RCPB contained significantly less remaining gutta-percha/sealer compared to canals prepared with PWOG (P=0.02). The RCPB instruments required significantly less time to complete the retreatment procedures (P<0.01). No unwinding or instrument separation was noted. RCPB instruments removed significantly more gutta-percha/sealer from simulated curved root canals than PWOG. However, neither of the tested instruments completely removed all filling materials.

Revista de la Asociación Odontológica Argentina, Oct 10, 2018

Revista de la Asociación Odontológica Argentina, 2021

Objetivo: En los granulomas periapicales, los plasmocitos (PL) participan activamente mediante la... more Objetivo: En los granulomas periapicales, los plasmocitos (PL) participan activamente mediante la liberación deinmunoglobulinas. El propósito de este ensayo fue identificar y contar el número de PL en diferentes períodos de tiempo en lesiones periapicales experimentales en ratas. Materiales y métodos: Mediante la exposición al medio oral de la pulpa de los primeros molares inferiores izquierdos, se indujeron granulomas periapicales en ratas a las que previamente se les suministró anestesia. La pulpa de los primeros molares inferiores derechos no fue expuesta, y estos dientes se utilizaron como control. Los animales fueron eutanasiados a los 10, 30 y 60 días de la exposición. Los maxilares inferiores fueron removidos, y los primeros molares, junto con los tejidos circundantes, se procesaron para su estudio histológico. Se obtuvieron secciones semiseriadas, posteriormente coloreadas con verde de metilo-pironina (VMP). Cada tres secciones, las tres siguientes fueron coloreadas con hema...

Operative Dentistry, 2013

SUMMARY Objective To assess the sealing properties of three different luting materials used for c... more SUMMARY Objective To assess the sealing properties of three different luting materials used for cementation of full cast crowns on extracted human premolars. Methods Thirty noncarious human premolars were prepared in a standardized fashion for full cast crown restorations. All margins were placed in dentin. After impressions of the preparations, stone dies were fabricated on which copings were waxed, which were cast in type III alloy using standardized laboratory methods. Teeth were randomly assigned to three groups of 10 samples each (n=10), for which the following cements were used: 1) a resin-modified glass ionomer cement, Rely X Luting Plus (3M ESPE, St Paul, MN, USA); 2) a self-adhesive resin cement, Maxcem Elite (Kerr Corporation, Orange, CA, USA); and 3) a glass ionomer cement, Ketac Cem (3M ESPE), the latter used as control. After cementation the samples were allowed to bench-set for 10 minutes, stored in water at 37°C, subjected to thermal cycling (2000×, between 5°C and 55...

International Endodontic Journal, 2006

Aim To compare the efficacy of hand versus automated instrumentation when retreating oval‐shaped... more Aim To compare the efficacy of hand versus automated instrumentation when retreating oval‐shaped root canals.Methodology Sixty human premolars with single oval canals were instrumented and filled with gutta‐percha and sealer and divided into three groups (n = 20) – group 1: ProFile .04 taper rotary instruments; group 2: Anatomic Endodontic Technology (AET), and group 3: manual instrumentation with Hedström files. The teeth were split longitudinally and gutta‐percha/sealer remnants in the coronal, middle and apical thirds were assessed with light microscopy. The mean percentage of gutta‐percha/sealer remnants for each group was calculated and statistically analysed for significance using an anova repeated measures (P < 0.001) and Tukey's multiple comparison test. The time required for retreatment was analysed using a one‐way anova and Tukey's test (P < 0.001).Results Overall, 10–18% of the canal walls were covered with gutta‐percha/sealer remnants after preparation u...

Dental Traumatology, 1999

— Ninety human teeth with a total of 181 prepared root canals were filled with the use of ultraso... more — Ninety human teeth with a total of 181 prepared root canals were filled with the use of ultrasonically energized spreaders as an aid for lateral condensation of gutta‐percha cones. The results were evaluated on the basis of clinical and radiographic criteria. Adequate fillings were found in 93% of the canals and the overall success rate was 93%. All of the recalled patients were clinically comfortable.

Journal of Clinical and Experimental Dentistry, 2012

Objective: To evaluate the effectiveness of the NaviTip FX, brush-covered irrigation needle, in r... more Objective: To evaluate the effectiveness of the NaviTip FX, brush-covered irrigation needle, in removing calcium hydroxide from the root canal. Study Design: Thirty single-rooted teeth were randomly divided into three groups: A-irrigation with a hypodermic needle inserted as far as possible without binding and activation with #30 K-type file; B-Irrigation with a hypodermic needle without activation; C-irrigation with NaviTip FX needle. Sodium hypoclorite 1% was used in irrigation. The root canals were examined trough scanning electron microscopy. Calcium hydroxide removal was recorded at 1, 5, and 10mm from the working length (WL) and the data were analysed using one-way ANOVA test (p<0.05). Results: NaviTip FX and hypodermic needle activated with #30K-type file showed lower score at 10 and 5mm with no significant difference between them. Comparison within groups did not show significant differences. All groups showed significantly better smear layer removal at 5 and 10 mm from the WL. Conclusion: The apical third (1mm) of the root canal was found to be the most critical site for Ca(OH) 2 removal.

Journal of Endodontics, 1998

In this study, we report a case of a four-rooted maxillary second molar in which three well-separ... more In this study, we report a case of a four-rooted maxillary second molar in which three well-separated buccal roots were located. This case demonstrated that even though it is not common, an extra root containing an independent root canal may occur.

Dental Traumatology, 1996

Twenty samples of each size designation of finger spreaders and accessory gutta-percha cones were... more Twenty samples of each size designation of finger spreaders and accessory gutta-percha cones were randomly selected from a proprietary standardized system currently used for lateral condensation procedures. Their diameters were measured with a calliper and their morphological variations at the areas of their apical thirds were analyzed with the scanning electron microscope. Results of the measurements indicated that there were high degrees of variation between all spreaders and their corresponding accessory gutta-percha cones (p < 0.001). SEM examination showed the presence of many morphologic irregularities and lack of uniformity between spreaders and cones of the same size. Our results emphasize the need for more precise criteria to fulfill the requirements of standardization by the manufacturer to provide an accurate method for root canal obturation.