Analysis of sealing ability of root canal sealers using scanning electronic microscopy technique.

INTRODUCTION: An ideal endodontic sealer should adhere firmly both to dentin and to gutta-percha. OBJECTIVE: The aim of this study was to evaluate the adhesion of the root canal filling to dentin and gutta-percha using scanning electronic microscopy (SEM). METHODS: The sealing ability of endodontic sealers to dentinal walls of the root canal was assessed in recently extracted human single canal premolars. Twenty teeth were prepared using the crown-down technique and irrigated with 3% NaOCl. A total of 20 samples were divided into two groups. The root canals were obturated using Ketac-Endo Aplicap and GutaFlow. The sealing ability and adhesion properties at the sealer-dentin interface were studied using SEM and the results were rated from 1 to 3; extremely good adhesion (rated 1), good adhesion (rated 2) and a relatively good adhesion (rated 3). RESULTS: The results showed extremely good adhesion on Ketac-Endo and GuttaFlow dentin interface. GuttaFlow has strong adhesion (rated 1) to gutta-percha in comparison with Ketac-Endo to gutta-percha interface (rated 2). CONCLUSION: New GuttaFlow filling material has a strong sealing ability and excellent adhesion to dentinal walls and gutta-percha cones. Ketac-Endo showed excellent bond to dentin with a slightly weaker adhesion capacity to the gutta-percha cones in comparison to GuttaFlow.

[Morphological characteristics of mesiobuccal root canals of the first maxillary molars].

INTRODUCTION: The first maxillary molar is a tooth with three roots, and mesiobuccal one is with the most complex canal morphology. Factors influencing variations of its morphology are numerous, and may significantly complicate endodontic treatment. OBJECTIVE: The objective was to investigate the number, configuration and curvature orientation of the mesiobuccal root canals in the maxillary first molars. METHODS: The study was conducted on 200 mesiobuccal (MB) roots of extracted first molars in human subjects using radiography. In each canal Flexofile was introduced until reaching the apical foramen and the root was then radiographed in series from two projections. Number of root canals (MB1, MB2 and MB3), configuration according to Vertucci classification, and the orientation of the curvature were established. Relevant statistical parameters and the significance of differences were computed (p < 0.05). RESULTS: Of total 200 mesiobuccal roots 86.5% were with two, 9% with three, and 4.5% with a single canal. Most frequent configurations were type IV (36%) and II (34.5%). From the clinical projection all MB, canals were oriented distally, from the proximal 78% palatally and 22% buccally. The orientation of all MB2 canals was distal from the clinical projection, from the proximal projection 76% were oriented palatally, and 24% buccally. The MB3 canal was always oriented distally from the clinical projection, and buccally from the proximal aspect. CONCLUSION: The mesiobuccal roots of the first maxillary molars showed multiple canals in 96%, with dominant Vertucci type II and IV of configuration. All canals were curved.

[Assessment of financial flow in the health system of Serbia in a period 2003-2006].

BACKGROUND/AIM: The main goal of every health policy is not merely the establishment of the health system sustainability, but the accessability of health services to the whole population, as well. This objective is shared in European Union countries, and the consequence is the implementation of National Health Accounts (NHA). NHA, as a tool for evidence-based management, provides data regarding financial flow in health at national level and allows international comparability. The aim of this study was to determine Serbian overall health spending patterns by National Health Accounts, and to determine health care indices to provide policy makers with internationally comparable health indicators. METHODS: A retrospective analysis of healthcare expenditures was obtained from the published final financial reports of relevant state institutions during a period of 2003 to 2006. The various sources of data on healthcare expenditures were connected according to instructions by the OECD "A System of Health Accounts (SHA)" Version 1.0. RESULTS: The obtained results showed: health expenditures in Serbia made up 8.6%, 8.3%, 8.7% and 9% of the GDP in 2003, 2004, 2005 and 2006, respectively; the Health Insurance Fund was a predominant financing source of the public sector with 93% in 2006; the largest part of the total health expenditures went towards hospitals and for health services; the expenditure per capita in 2006 was 365 US$; Serbian population finances the state institutions "out of pocket" with 21.28% of their sources, which was 7.3% of the total healthcare expenditures, and the private institutions with 78.72% of their financial sources, which is 27% of the total healthcare expenditures. In 2006 Serbia allocated financial resources out of GDP in the amount similar to the European Unity, while comparing to the countries of the region, these funds were less only than in Bosnia and Hertzegovina. This allocating of financial resources in total, however, was low as the consequence of relatively low level of GDP in Serbia. CONCLUSION: Establishing NHA provided a pattern of national healthcare spending and allowed a comparison of healthcare system in Serbia with the systems of other countries. Analysing a period 2003-2006 revealed a similarity between Serbia and the countries of the European Unity in regard to the level of average financial resources allocation for healthcare expressed as a percentage of GDP, as well as in regard to financiers in the system of healthcare. A high purchasing power disparity, however, in healthcare services was observed between the population of Serbia and other European countries.

[Evaluation of utilization of insured rights to preventive dental examinations in primary health care in the Republic of Serbia in the period 2003-2006].

INTRODUCTION: The dental health sector reform in Serbia has commenced in order to implement health policy changes. Assessment of legally regulated citizens rights to preventive dental examination, revision of those rights and their promotion are one of the dental health reform priorities. OBJECTIVE: The objective of this study was to assess the utilization of preventive dental examination (PDE) in Serbia in 2006 among different subject groups and different districts and to analyse financial resources spent for those measures. Also, study aims were to compare the utilization of rights to preventive dental examination in Republic of Serbia in period between 2003-2006. METHODS: The retrospective analytical study of Public Health institute and Republican Statistical Office data were conducted. The comparative analytical method was used for assessment of preventive dental examinations within the given time frame from 2003 to 2006. RESULTS: Results achieved in realization of PDE show a broad spectre of district discrepancies. The variation factor depending on preventive examination or population group it is related to varies from 26.73% to 90.88%. CONCLUSION: Realization of preventive dental examinations in the Republic of Serbia was significantly lower than projected in the period 2003-2006.

[Significance of crown-down root canal preparation technique in endodontic therapy by using the hydroxylapatite sealer].

AIM: To evaluate the crown-down preparation technique, and the use of hydroxylapatite based material for the definitive root canal obturation. METHODS: The investigation included 20 single-canal roots with chronic periapical inflammatory lesion. Biomechanical medicamentous canal preparation was done using the double-flared technique with balanced force, and the obturation was performed with hydroxylapatite sealer (unicone technique). Clinical and radiographic check-up performed 12 months after the treatment, used the following parameters: pain, swelling, percussion and palpation sensitivity, and the presence of fistula. RESULTS: The obtained results showed a successful treatment in 18 cases, while in the 2 cases the treatment failed. CONCLUSION: These findings suggested that the crown-down preparation technique efficiently cleaned and shaped the root canal, and that the hydroxylapatite-based material created the homogenous and hermetic root canal obturation, so this methodology could be recommended for the endodontic therapy.

[Concept of "long centric"]. / Koncept "long centric".

The objective of this paper was to show the historical perspective of the "long centric" occlusal concept and its importance in the modern dentistry, especially from the gnathological aspect. The "long centric" concept represents therapeutic modality used in modern dentistry and occlusal adjustment in all patients showing differences in strong and weak closure of the lower jaw starting from the position of physiological rest. "Long centric" concept is applied only for anterior teeth and occlusal movements from rather than toward the center. Whenever the "long centric" parameters are not adequate, occlusal disturbance, resulting from the "wedge" effect during the initial closure of the lower jaw, is present. Different degrees of abrasion or hypermobility of the teeth are often the result of the above-mentioned occlusal disturbances and can potentially trigger bruxism and malfunction. Modus procedendi should be the regular approach of every dentist to any occlusion, because only the built-in "long centric" efficiently contributes to the occlusal stability of the anterior portion of the dentition. All occlusions should be routinely tested regarding their need for "long centric", especially when the extensive therapeutic interventions (conservative, prosthetics) of the occlusal complex are required.