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At least 1,117 records · Page 62Linked to original sources
PubMed2005

Chemical or microbiological models of secondary caries development around different dental restorative materials.

This study evaluated artificial secondary caries around restorative materials, induced by means of chemical or microbiological models. The following materials were used randomly to restore 130 dental blocks: (1) zinc-oxide eugenol-free temporary filling: Coltosol (Coltène/Whaledent Inc.; n = 30), (2) silver amalgam: Permite C (SDI Limited, n = 20), (3) composite resin: Filtek Z250 (3M ESPE; n = 20), (4) glass-ionomer cement: Fuji II (GC America Inc.; n = 20), (5) resin-modified glass ionomer: Vitremer (3M ESPE; n = 20), and (6) polyacid modified resin: Dyract AP (Dentsply; n = 20). Ten specimens of Group 1 were kept in humidity, and had no carious formation (NC). Ten specimens of each group were submitted to pH cycling (CG, n = 60), and the others were immersed in a medium containing Streptococcus mutans and sucrose (BG, n = 60). Mineral content was determined by microhardness assessment, and lesion depth was measured in polarized light photomicrographs. In the chemical model (CG), mineral content values in the vicinities of restoration were high for Groups 5 (75.7 +/- 11.9), 4 (70.8 +/- 14.2), and NC (95.4 +/- 3.8); intermediate for Groups 1 (55.8 +/- 18.5), 6 (45.6 +/- 11.0), and 2 (44.3 +/- 11.2); and reduced for Group 3 (34.7 +/- 9.7). In the microbiological model (BG), results were similar to CG, although there was less demineralization. The highest lesion depths were found for Groups 3 (182.3 +/- 33.2) in CG and 6 (126.5 +/- 42.8) in BG, when compared to Group 5 (114.6 +/- 26.0 and 56.2 +/- 33.2, respectively). In both models of caries induction, ionomeric materials showed a superior cariostatic effect when compared to the other restorative materials.

Animals↗
PubMed2002

Immediate implant loading: a case report.

The therapeutic goal of implant dentistry is not merely tooth replacement but total oral rehabilitation. Considering dental implants as a treatment option can provide patients with positive, long-term results. Implants have developed into a viable alternative to conventional prosthetic reconstruction of edentulous areas. They provide excellent support for fixed or fixed detachable appliances, which increases function compared with conventional complete dentures. Implant dentistry has gone through many phases over the years. Modern technology and design allows us to predictably place our dental implants in immediate extraction sites and often load the implants at the time of placement. Single tooth-by-tooth reconstruction provides easy access for the patient to floss and clean the areas compared with the relative difficulty in maintenance when crowns are splinted. This case study demonstrates full maxillary and partial mandibular reconstruction using dental implants. The implants were surgically placed immediately after extractions and loaded using a stable roundhouse composite temporary bridge. Following osseointegration, the implants were permanently restored with individual crowns.

Aged↗
PubMedDate not supplied

A new method for achieving passive fit of an interim restoration supported by Brånemark implants: a technical note.

When carrying out restorations supported by dental implants, it is advisable to have a temporary method that offers the possibility of evaluating and/or creating a proper emergence profile, peri-implant health, occlusion, esthetics, acceptable phonetic response, and hygiene, as well as one that facilitates progressive loading of the implants during the bone maturation period. To maintain osseointegration it is essential that a prosthesis fit with total passivity, since the lack of a periodontal ligament renders the implant unable to modify its position. Gold cylinders for EsthetiCone abutments, which were modified following a previously reported technique, were used so that provisional prostheses could be fixed to the cylinders in the mouth by means of an alternative cementing technique. By this way, a provisional prosthesis with total circumferential fit, maintaining the option of retrieval, could be routinely obtained.

Acrylic Resins↗
PubMedDate not supplied

An alternative restorative method for regional odontodysplasia: case report.

A 5-year-old Caucasian male presented with early loss of multiple deciduous teeth. All the characteristics were consistent with the diagnosis of regional odontodysplasia (ROD). Significant initial findings included premature loss of multiple primary mandibular teeth and some malformed permanent teeth. The affected teeth showed hypoplastic enamel and dentin, short roots, and wide pulp chambers, and were localized in the mandibular dentition. Treatment objectives for this patient were to provide improved esthetics, restored chewing function, and space maintenance by the construction of a temporary prosthetic restoration. However, with limited tooth support and an unusual occlusal pattern, it is difficult to obtain satisfactory retention and esthetics with traditional prosthetic techniques. In this article we introduce an alternative method for fabricating a custom removable denture and discuss the prognosis of the malformed permanent dentition and further treatment plan.

Child, Preschool↗
PubMed2001

Microleakage of endodontically treated teeth restored with fiber posts and composite cores after cyclic loading: a confocal microscopic study.

STATEMENT OF PROBLEM: The effectiveness of the seal obtained with carbon fiber posts and composite cores is still unclear. Both 3-step dental adhesives and self-etching adhesive primers have been suggested as adhesive systems. PURPOSE: This confocal microscopic study evaluated the microleakage of teeth endodontically treated and restored with fiber posts and composites with 3 adhesive systems. MATERIAL AND METHODS: A total of 72 human mandibular premolars were endodontically treated and divided into 6 groups of 12 teeth each. The first 3 groups were treated with an endodontic sealer containing zinc oxide-eugenol (ZOE) and restored with temporary filling materials containing ZOE. The last 3 groups were treated with ZOE-free materials. Post spaces were prepared in the root canals. The first group treated with ZOE-based materials was restored with fiber posts cemented with zinc phosphate cement and composite cores without adhesive. The other 2 groups of ZOE-treated teeth were restored with fiber posts cemented with All Bond 2 and Panavia 21 dental adhesives, respectively. The last 3 groups were restored with fiber posts cemented with All Bond 2, Panavia 21, and Panavia Fluoro cement, respectively. The teeth were loaded intermittently at 2 cycles per second in a moist environment and, after 300,000 cycles, immersed in a solution of Rhodamine B dye for 48 hours. A confocal microscope was used to observe the teeth. The ratio between the length of the interfaces observed and the length of the dye penetration was evaluated. Two teeth from each group acted as controls and were not subjected to dynamic loads. RESULTS: All resin cement groups leaked significantly less than the group cemented with zinc phosphate cement. No statistically significant difference was found between the microleakage of teeth treated with ZOE-based and non-ZOE-based materials. Teeth restored with All Bond 2 dental adhesive leaked significantly less than those restored with Panavia cement. CONCLUSION: The 3-step dental adhesive (All Bond 2) resulted in a better marginal seal than that obtained with the self-etching primers (Panavia 21 and Panavia F). The use of endodontic sealers and temporary filling materials containing ZOE had no detrimental effect on the marginal seal of carbon fiber post/composite resin core restorations.

Adhesives↗
PubMed2004

Biomechanical aspects of monoblock implant bridges for the edentulous maxilla and mandible: concepts of occlusion and articulation.

The knowledge of forces that influence implants and suprastructure is important for the restorative dentist to realize the surface areas and vertical dimension of fixed restorations. The purpose of the concepts of occlusion is to respect the protection of implants that receive stress transmission and being aware of destructive forces. In cases in which the edentulous maxilla and mandible are provided with large monoblock implant bridges, the author recommends a bilateral balanced group guidance. If biomechanical principles are not respected, implant loss and restoration failure will result. For the first adjustment of occlusion and articulation patterns immediately after implantation, fixed temporaries are placed on the implants. Another 40 to 60 days later, the temporaries are exchanged for definitive implant bridgework.

Biomechanical Phenomena↗
PubMed1997

Utilization of advanced hygienist skills in the private practice.

PURPOSE: The purpose of this study was to survey dental hygiene graduates to determine utilization in the private practice setting of expanded functions taught in school. METHOD: A questionnaire was sent to 90 dental hygiene graduates from the classes of 1990-1994, of Indiana University-Purdue University, Fort Wayne. Analysis was done on utilization of specific expanded functions taught in school. Frequency tabulations of procedures performed and adequacy of preparation were done using the SAS software. The results were graphically represented in tables. RESULTS: Equal response from each class resulted in the total response rate of 74%. The expanded functions most frequently performed by dental hygienists were placing sealants followed by making cast impressions. Placing temporary and amalgam restorations were rarely performed. The majority of graduates felt adequately trained to perform these skills. CONCLUSION: Skills being required and taught in school are not being delegated in private practice. This survey shows the need for curriculum revisions and discrepancies between educational requirements and utilization.

Dental Hygienists↗
PubMed1996

Enhanced aesthetics using provisionalization.

The proper fabrication of provisional restorations is integral to the overall success of restorative dentistry, as these templates are the initial architecture for the completed case. In a clinical setting, restorations may be utilized for an extended period, during which time the clinician and patient must feel confident. Due partially to a new generation of dental materials with unique properties, provisionalization can be predictably achieved. This article reviews the clinical criteria for the fabrication of interim restorations using a light cure/dual phase temporary crown and bridge material (Provipont DC, Ivoclar Vivadent, Amherst, NY) and its effect on the overall success of restorative procedures, including anterior and posterior restorations.

Bisphenol A-Glycidyl Methacrylate↗
PubMed2004

Early function of splinted implants in maxillas and posterior mandibles, using Brånemark System Tiunite implants: an 18-month prospective clinical multicenter study.

BACKGROUND: Immediate or early loading of implants placed in maxillas and posterior mandibles has been a concern as bone density is often low in these areas, making it difficult to establish good initial implant stability. By adapting implant design and insertion protocols, however, high initial implant stability may be achieved in these regions. Further, a modified implant surface texture has been proved to help in maintaining stability during the initial healing period. PURPOSE: The aim of the present study was to investigate the clinical performance of oxidized titanium implants (TiUnite, Nobel Biocare AB, Gothenburg, Sweden) when used for early function in the maxilla and in the posterior mandible, locations where the bone density often is low. A further aim was to evaluate the marginal bone level at oxidized implants and compare it with that of machined-surface implants used in a previous study. MATERIALS AND METHODS: Thirty-one patients were consecutively included in the study, and 37 edentulous areas in maxillas and posterior mandibles were treated. Bruxism and uncontrolled periodontal disease were exclusion criteria. Temporary prostheses were generally placed within 9 days but not after 16 days from implant placement. A previous study applying the same study design and clinical protocol but using machined-surface implants was used for comparisons. RESULTS: Of the 111 implants installed, 1 failed, giving an overall survival rate of 99.1% after 18 months. The prosthesis survival was 100%. The marginal bone resorption was 0.8 mm (standard deviation [SD], 1.0), as opposed to 1.6 mm (SD, 1.3) in the previous study with machined-surface implants, but was not statistically significantly different (p = .10). CONCLUSION: The present clinical protocol (aiming at high primary stability) and the use of oxidized titanium implants for early functional loading in the maxilla and the posterior mandible resulted in a high implant survival rate and a favorable marginal bone level during a follow-up of 18 months. The difference in marginal bone resorption between the oxidized implants in the present study and the machined implants from a previous investigation with the same study design was not statistically significant.

Adult↗
PubMed1995

Mechanical properties of a light-polymerizing provisional restorative material with and without reinforcement fibers.

Interim restorations are vulnerable to inadvertent fracture during mastication. Autopolymerizing acrylic resins have traditionally been selected for fabrication of provisional restorations. Triad light-polymerizing tooth-colored acrylic resin was recently introduced as an alternative material for this procedure. This material does not contain methyl methacrylate monomer and permits an increased working time. Heavy occlusal forces may initiate cracks within these restorations, and propagation of these cracks may ultimately lead to failure. Various forms of reinforcement fibers are available and are marketed for strengthening dental resins used for provisional restorations. Investigators have demonstrated that the mechanical properties of acrylic resins may be improved with the incorporation of reinforcing fibers, but a published evaluation of fiber-reinforced light-polymerizing provisional restorative materials is lacking. This investigation recorded and compared two mechanical properties of one light-polymerizing provisional restorative material with and without incorporation of vertically and horizontally oriented woven, matted, polyethylene fibers. No significant difference in modulus of rupture was recorded between groups with and without fibers. The mean flexural elastic modulus of the group with the horizontally oriented fibers was significantly greater than the mean flexural elastic modulus of the specimens without incorporated fibers.

Acrylic Resins↗
PubMed1995

The effect of poly-aramide fiber reinforcement on the transverse strength of a provisional crown and bridge resin.

A total number of 65 specimens of a provisional crown and bridge (PMMA) poly methyl methacrylate (acrylic resin) was utilized in the present study. Sixty specimens were reinforced either by silane-treated or un-silane-treated poly-aramide fibres. The specimens were classified according to the length and the fiber orientations. It was found that, the silanated longitudinally fibered specimens offered the greatest transverse strength (87.2 Mn/m2). On the other hand, the transversely fibered specimens demonstrated the lowest value (44.4 Mn/m2). Moreover, the 6 mm long randomly oriented silanated fibered specimens possessed a higher transverse strength values (73.6 Mn/m2) compared with 3 mm long and the combination 6 mm + 3 mm long silanated fibered specimens (55.2 Mn/m2 and 62 Mn/m2) respectively. It was demonstrated also that, the inclusion of the un-silanated fibers reduced the transverse strength values of the resin specimens dramatically.

Acrylic Resins↗
PubMed1998

Processed acrylic resin provisional restoration with lingual cast metal framework.

Fixed provisional prostheses are fabricated to maintain, improve, and/or change oral function and esthetics for varying periods. It is important to know when to provide a provisional prostheses and how to make one so that it will meet the needs of the patient. This article describes a modification of the design of a cast metal reinforced processed acrylic resin provisional restoration for extensive, long-term reconstruction with implants, because some of the treatments rendered to patients require temporization for up to 2 years. This design has been used by the authors since 1991, and has resulted in fewer problems of fracture of the provisional restorations. In addition, removable partial dentures are rarely needed, even when large spans exist between remaining abutments in serial extractions. This procedure also permits performing guided bone regeneration for deficient ridges without the problem of transmucosal loading, while still maintaining the patient's esthetics and function after surgery.

Acrylic Resins↗