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At least 1,405 records · Page 78Linked to original sources
PubMed1994

[Diagnosis of primary caries. Current techniques and their consequences for treatment].

The decline in caries prevalence in The Netherlands has incited dentists to focus their attention to the detection of small carious lesions rather than large cavities. The diagnosis of primary caries is, however, still predominantly being accomplished by the traditional diagnostic methods, used in the high caries prevalence era. Today's appearance and behaviour of caries lesions have led to the situation that incipient enamel lesions, dentinal caries and cavities are frequently missed during routine recall examinations. There is increasing concern with the occurrence of large caries lesions underneath visually intact enamel. These problems have induced diagnostic research aimed at developing and evaluating new caries diagnostic methods and some of them are already used in general practice. Visual inspection and bitewing radiography, however, still constitute the most important methods in the diagnosis of primary caries. The results from these examinations are used to classify an individual's caries risk, to monitor the progression of existing caries lesions, and to aid preventive or restorative treatment decision making.

Dental Caries↗
PubMedDate not supplied

Fracture resistance and primary failure mode of endodontically treated teeth restored with a carbon fiber-reinforced resin post system in vitro.

PURPOSE: This study was undertaken to characterize the fracture resistance and mode of fracture of endodontically treated incisors restored with cast post-and-core, prefabricated stainless steel post, or carbon fiber-reinforced composite post systems. MATERIALS AND METHODS: Ten endodontically treated teeth restored with each technique were subjected to a compressive load delivered at a 130-degree angle to the long axis until the first sign of failure was noted. The fracture load and the mode of fracture were recorded. RESULTS: The failure loads registered in the three groups were not significantly different. Between 70%, and 80% of teeth from any of the three groups displayed fractures that were located above the simulated bone level. CONCLUSION: The use of carbon fiber-reinforced composite posts did not change the fracture resistance or the failure mode of endodontically treated central incisors compared to the use of metallic posts.

Adhesiveness↗
PubMed2000

Endodontic anatomy of the root canals of lower incisors.

Ninety lower incisors of known age (18 to 20 yr, 30 to 40 yr and over 50 yr) were grouped into 2 sets of 45 pieces each. Cross sections of the root at 4 levels (coronal, middle and apical thirds and 2 mm from the apex) were employed to study: 1. The shape of the canals 2. The changes in diameter induced by age 3. The correlation at the apex of the maximum diameter of the root canal with the Dzero diameter of endodontic instrument. The results showed that the canal anatomy of lower incisors is not as simple as it appears to be and that it is characterized by the predominance of flat shapes even in the vicinity of the foramen. The statistical analysis showed that the dentin deposits, typically age-associated, are influenced by the morphological changes that take place. A true compensation occurs between the different buccolingual and mesiodistal diameters, particularly in the vicinity of the apex, to guarantee irrigation in old age and avoid calcification fo the canal. The correlation between the maximum diameter of the canal at 2 mm from the apex and the Dzero diameter of the instruments evidenced the difficulties involved in adequate apical preparation of these teeth, regardless of age.

Adolescent↗
PubMed2000

Achieving ultimate anterior esthetics with a new microhybrid composite.

Direct bonding is one of the most commonly used forms of restoration for the conservative esthetic improvement of anterior teeth. The major challenges involve selecting composites that have adequate strength as well as provide lifelike optical properties that render the restoration functionally sound and esthetically pleasing. Properties such as high sculptability, wide shade range, varying opacities and translucency, as well as high polishability are essential for gaining absolute control over the restorative process and the attainment of natural-looking results. This article discusses a new composite restorative system and its application in the direct esthetic and functional rehabilitation of the anterior dentition.

Adult↗
PubMed2001

Fractographical analysis of resin-dentin bonds.

PURPOSE: To characterize resin-dentin bond structures of three adhesive resin systems using fractographic analysis to measure the area of failure at the fractured surface. MATERIALS AND METHODS: Flat dentin surfaces were ground perpendicular to the long axis of the tooth. The prepared dentin surfaces were treated by one of three adhesive resin systems (Mac Bond II, One-Step, and Single Bond). The samples were sectioned perpendicular to the adhesive interface to produce a square bar-shaped specimen (adhesive area: 0.9 mm2) using a diamond saw. A micro-tensile test was then conducted at a crosshead speed of 1.0 mm/min. The mean tensile bond strengths were statistically compared using one-way ANOVA and Fisher's PLSD test (P< 0.05). The fractured surfaces of all specimens were examined using SEM and the area of failure was measured using an image analyzer on SEM microphotographs. RESULTS: No significant differences in tensile bond strength were observed between Single Bond (62.1+/-18.2 MPa) and One-Step (53.8+/-13.1 MPa) (P > 0.05). However, the bond strength of Mac Bond II (36.5+/-13.7 MPa) was significantly lower than that of One-Step or Single Bond (P< 0.05). At the fractured surface, except for the cohesive failure of the bonding resin and resin-based composite, different failure patterns were observed for each resin system as follows: the failure of the hybrid layer and demineralized dentin was observed in the two wet bonding systems (One-Step and Single Bond) and of the hybrid layer but not the demineralized dentin in the self-etching primer system (Mac Bond II). The results demonstrated that the integrity of the hybrid layer depends on the adhesive system.

Analysis of Variance↗
PubMed2002

Direct restoration of anterior teeth: review of the clinical technique and case presentation.

Direct composite resin bonding procedures are growing in popularity as conservative and predictable restorative treatment alternatives. An understanding of the fundamental layering, contouring, and polishing principles is paramount to the success of any direct composite restoration; this awareness can be subsequently applied to indirect restorations and significantly enhance laboratory/clinician communication. This article presents a clinical technique that describes the incremental placement of direct resin veneers on a typodont and demonstrates the application of these procedures on an actual clinical case.

Adult↗
PubMed2002

The injection-molded technique for anterior maxillary provisional restorations: a clinical case.

Provisional restorations provide valuable clinical information for the definitive restorations. In the provisionalization phase, they guide the healing of the gingival tissues and allow the clinician to determine any necessary phonetic or aesthetic adjustments; provisional restorations also assuage patients' psychological concerns regarding their appearance. This article highlights the development of provisionalization procedures and describes disadvantages that have furthered the quest for improvements. An alternative technique for fabricating provisional restorations through an injection-molding process is demonstrated for the anterior maxilla.

Adult↗
PubMedDate not supplied

Use of natural teeth in an interim partial denture.

A clinical case is presented in which the patient's natural teeth were used in an interim partial denture. The patient accepted this treatment despite his reluctance to have the periodontally hopeless anterior teeth extracted. This technique may be used when the patient is emotionally unprepared for tooth loss, when the teeth to be replaced are highly characterized, or when no suitable denture tooth is available.

Adult↗
PubMedDate not supplied

Avoiding failures during insertion of all-ceramic restorations.

The seating, cementing, and finishing of all-ceramic restorations can be a very demanding operation. All steps must be accomplished well in order to produce a clinically acceptable result. Successful placement of all-ceramic restorations can result in an immediate reward for both the patient and the operator; however, only with very careful consideration of occlusion, laboratory work, and chairside seating and finishing can a successful long-term result be realized.

Cementation↗
PubMed2002

A technique for using maxillary anterior soft-tissue undercuts in denture placement: a case report.

Restoring a large edentulous space in the anterior maxilla presents many challenges, including how to utilize and manage a deep anterior soft tissue undercut. In the case reported here, a partial denture was constructed that incorporated a semi-rigid exterior flange and a soft liner to help the denture to engage the depth of the undercut. The denture was placed after extraction of the anterior teeth, and there was very little postoperative tissue trauma. With this combination of materials, known as "triple lamination", the prosthesis was able to engage the soft-tissue undercut, the undercut was actively involved in retaining the prosthesis, the denture could be placed immediately, and the prosthesis was very comfortable. Triple lamination should be considered when a deep soft-tissue undercut must be engaged to ensure retention of a prosthesis.

Aged↗