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At least 1,711 records · Page 95Linked to original sources
PubMed1998

Assessment of the apical transportation of root canals using the method of the curvature radius.

The purpose of this investigation was to evaluate the occurrence of apical transportation after root canal instrumentation using only K-Flexofiles or K-Flexofiles intercalated with K-Flexofile Golden Mediums. For this purpose, the degree (Schneider's method) and the radius of the curvature was recorded before and after instrumentation. The results showed that there was no statistically significant difference between the techniques. The correlation between the degree and the radius of curvature of the root canal was not consistent, nor was there a relationship between the original radius of curvature and the apical transportation. However, determination of curvature by use of its radius has proved to be an effective method.

Dental Instruments↗
PubMed1998

Ultraconservative dentistry.

Ultraconservative techniques are providing dentists with new opportunities for the rehabilitation of the debilitated dentition. These techniques involve the use of bonded, reinforced ceramics that restore function and esthetics. The new parameters of ultraconservative treatment include the routine use of supragingival margins, color gradients, and the alteration of the occlusal vertical dimension. The minimally invasive nature of these new techniques makes them more readily acceptable to, and more easily maintainable by, patients.

Adolescent↗
PubMed1998

Multifunctional bases and liners.

Three one-minute techniques are presented using anhydrous resin modified glass isonomer, an antibacterial and multifunctional base and liner. The isonomer is placed in deep areas of caries, as insurance, and to desensitize the tooth and fill gaps. The anhydrous glass accepts water from the dentin to fill potential contraction gaps from polymerization shrinkage of the composite fill.

Acid Etching, Dental↗
PubMed1999

Tooth stabilization and splinting before and after periodontal therapy with fixed partial dentures.

The design and use of fixed partial dentures as a definitive restoration to stabilize and splint teeth have been reviewed. The provisionalization of the splinted patient has been described as it is incorporated into the treatment plan of patients with a weakened periodontium. The current controversy of incorporating implants in the patient requiring splinting was discussed, and recommendations are made. Dentists are encouraged to explain all potential ramifications of splinting with fixed partial dentures, including cost, frequency of office visits, and potential alterations or remakes of the prosthesis should physiologic demands surpass the capabilities of the remaining teeth.

Dental Implantation, Endosseous↗
PubMed1998

The role of cuspal flexure in the development of abfraction lesions: a finite element study.

A tooth flexure mechanism has been proposed over the past 15 yr to explain non-carious cervical tooth loss. It is well established that cavity preparation weakens a tooth, resulting in more cuspal movement under occlusal load. The aim of this study was to investigate the effect that an occlusal restoration would have on the stress profile in the cervical region of a lower second premolar using two-dimensional finite element stress analysis. Under an eccentric 100 N occlusal load, a premolar with an occlusal amalgam restoration showed peak tensile and shear stresses in the buccal cervical region that were in excess of the known failure stress for enamel. Increases in the cavity depth of the occlusal amalgam restoration were found to increase cervical stress more than increases in cavity width. It was concluded that the weakening effect of cavity preparation may contribute to the development of non-carious cervical tooth loss.

Bicuspid↗
PubMed1994

[The application of temporary crown and bridge for fixed prosthetic restorations]

The preparation of teeth for fixed prosthetic restoration needs the temporary restoration for various reasons.Once the enamel has been removed,a vital tooth of the sensitive dentin is exposed to the oral environment. If left unprotected teeth,the patient would experience a significant amount of sensitivity to the various stimulations to which the tooth is exposed.In addition,exposed dentin is much more susceptible to caries than enamel is.The prepared tooth is also lacking contact mesiodistall as well as occlusally with its counterparts in the dentition.It is not uncommon for the prepared tooth to drift mesially or distally or to extrued in an occlusal direction.This movement would,of course,cause problems in seating the final restoration.Temporization also allows for the testing of both the esthetic and functional design of the final restoration.The paper showed some fabrication methods for temporary crown and bridge and discussed the effect on the temporary crown and bridge and its needs for design.

Journal Article↗
PubMed1995

Clinical management of the avulsed tooth.

Treatment outside the dental office: Replant immediately after gentle washing if practical. If replantation is not practical, store the tooth in the best medium available. Storage media in order of preference are Hank's Balanced Salt Solution (HBSS), milk, saline, and saliva (buccal vestibule). Water is the least desirable storage medium. Treatment in the office: Emergency visit; Place tooth in HBSS while exam is conducted and history is taken. Prepare socket for gentle repositioning of the tooth. Prepare the root. Extraoral dry time < 20 minutes: Closed apex--replant immediately after gentle washing. Open apex--soak in 1 mg doxycycline in 20 mg saline for 5 minutes. Extraoral dry time 20 to 60 minutes: Soak in HBSS for 30 minutes and replant. Extraoral dry time > 60 minutes: soak in citric acid, 2% stannous fluoride, and doxycycline and replant. Endodontics can be done extraorally. Semirigid splint for 7 to 10 days. (If alveolar fracture is present, rigid splint for 4 to 8 weeks). Suture soft-tissue lacerations, particularly in the cervical area. Administer systemic antibiotics (penicillin V potassium if possible) Chlorhexidine rinses and stringent oral hygiene while the splint is in place (7 to 10 days). Analgesics as required. Second visit after 7 to 10 days: Endodontic treatment: Tooth with open apex and extraoral dry time of < 60 minutes: No endodontic treatment initially. Recall every 3 to 4 weeks to examine for evidence of pathosis. If pathosis is noted, disinfect the pulp space and start apexification procedure. Tooth with open apex and extraoral dry time > 60 minutes: If endodontics was not completed in the emergency visit, start endodontics and follow apexification procedure. Tooth with closed apex: Endodontics should be initiated after 7 to 10 days. Careful chemomechanical instrumentation under strict asepsis. Splint removed at end of visit. Obturation visit: If endodontics was initiated 7 to 10 days after the avulsion, obturation can take place after short-term calcium hydroxide treatment. If endodontics was initiated more than 14 days after the avulsion or inflammatory resorption, long-term calcium hydroxide for 6 to 24 months, obturated when an intact lamina dura is traced. Restorations: Temporary restorations: Should be 4 mm deep. Reinforced zinc-oxide-eugenol, acid-etch composite resin, glass-ionomer cement. Permanent restoration: Placed immediately after obturation. Acid-etch resin and dentin bonding agents. Follow-up care: Twice per year for 3 years and yearly for as long as possible. Late complications are common.

Dental Restoration, Permanent↗
PubMed2001

Shear strength after ethylenediaminetetraacetic acid conditioning of dentin.

On the basis of previous studies, it was hypothesized that a chelating agent such as ethylenediamine-tetraacetic acid (EDTA) in a saturated aqueous solution (24%) can function as a dentin conditioning agent with exposure times comparable to that of phosphoric acid without compromising shear bond strength. Thirty caries-free human third molars, divided equally between two groups, were used. In group one, four experimental surfaces were prepared on each tooth, and cylindrical copper matrixes with a diameter of 5 mm were attached to the prepared surfaces. The experimental surfaces were then treated with a 24% EDTA gel for 30, 60, 120, or 240 sec, respectively. Dentin was bonded with All Bond 2, after which a flowable composite was added and light-cured. In group two, which served as control, two surfaces were prepared on each tooth. One surface was left unetched, whereas the other side was treated with 24% EDTA-gel for 30 sec. A shear bond strength test was performed at a crosshead speed of 1 mm/min until the composite debonded. There was no statistically significant difference (P< 0.89) between results of the shear bond strength test for the different EDTA conditioning times. The control group showed a significant difference in shear bond strength between untreated surfaces and surfaces conditioned for 30 sec with EDTA. Thus, the results indicate that the duration of EDTA gel conditioning of dentin surfaces need not exceed that of phosphoric acid in clinical practice to obtain an acceptable level of bond strength.

Acid Etching, Dental↗
PubMed1999

Fracture resistance of teeth restored with onlays of three contemporary tooth-colored resin-bonded restorative materials.

STATEMENT OF PROBLEM: There are uncertainties regarding the use of large indirect composites and ceramics in the restoration of posterior teeth. PURPOSE: This study investigated the fracture resistance of teeth restored with restorations of 3 contemporary resin-bonded tooth-colored materials placed in a standardized onlay preparation. MATERIAL AND METHODS: A random sample of preparations for tooth-colored onlays was obtained from a full service dental laboratory. A preparation was then duplicated in 30 natural teeth by copy milling. An additional 10 teeth were not prepared, and acted as a control. Ten onlays of each of the 3 materials (Belle Glass, SR Isosit, and Empress) were produced and resin bonded into place according to the manufacturers' instructions. The restorations were compressively loaded to fracture and the mode of failure recorded. RESULTS: The fracture resistances obtained for the teeth restored with the composite material (mean 1.56 kN; SD 0.54) were greater than those obtained for the teeth restored with the ceramic material (mean 0.99 kN; SD 0.49) and the fiber-reinforced composite material (mean 0.99 kN; SD 0.56). CONCLUSION: Teeth restored with composite onlay restorations demonstrated a higher fracture resistance than equivalent sized onlay restorations produced from fiber-reinforced composite or a ceramic material. Failure under compressive loading may be found to be less catastrophic when a fiber-reinforced composite rather than a composite or ceramic material is used.

Acrylic Resins↗
PubMed2006

Enterococcus faecalis-mediated biomineralized biofilm formation on root canal dentine in vitro.

Enterococcus faecalis is the most predominant bacteria in teeth with failed root canal therapy and is found to survive harsh conditions prevailing in the root canals of endodontically treated teeth. This study aims to investigate the interaction between E. faecalis and root canal dentine substrate. Towards this end, tooth specimens were prepared and divided into two groups. The tooth specimens in group 1 were incubated with E. faecalis for periods of 2-, 4-, and 6-week intervals and the chemical composition of the biofilm was determined using X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. The tooth specimens in group 2 were incubated with E. faecalis for a period of 6 weeks and the topography and ultrastructure of the biofilm were examined using scanning electron microscopy (SEM), light microscopy, and laser confocal scanning microscopy. The sediments formed from the bacterial interaction on the dentine (in group 1) were also examined by SEM and FTIR. These experiments highlighted different stages in the interaction of E. faecalis with root canal dentine. Further, a bacterial-induced apatite reprecipitation on mature biofilm was also observed. This ability of E. faecalis to form such calcified biofilm on root canal dentine may be a factor that contributes to their persistence after endodontic treatment.

Biocompatible Materials↗
PubMed1995

Cavity design and dimensions of tunnel preparations versus composite resin Class-II preparations.

Fourteen pairs of extracted contralateral premolars with small, artificial, standardized, approximal 'caries lesions' were placed in 14 plaster jaws. Fourteen dentists made a mesial tunnel preparation and a distal composite resin preparation on one tooth and vice versa on the contralateral tooth. Less tooth substance was removed in the tunnel preparations than in the class-II preparations, but this difference was not statistically significant when the resin class-II preparations were made without occlusal retention. Twenty-five per cent of the tunnel preparations had residual 'caries', as opposed to 7% in the class-II composite preparations. Tunnel preparations with larger occlusal openings had less residual 'caries'. The morphology of the class-II resin preparations varied considerably, indicating a lack of precise descriptions in the dental literature.

Analysis of Variance↗
PubMed1975

[Report of case of opalescent dentin. A polariation optic and microradiographic study on a pulpless tooth].

Ground sections prepared from a molar (-7) with opalescent dentine were investigated by the means of polarizing microscopy and microradiography. Histological and clinical findings are discussed. Unfortunately, heredity could not be surely determined. But in all experience we are shure, that a hereditary mutation, recently or earlier in a generation occured, was the cause also in this case.

Adult↗