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At least 649 records · Page 36Linked to original sources
PubMed1999

Fracture strength of intact and fragment-bonded teeth at various velocities of the applied force.

Bonding of a tooth fragment to the remaining tooth substance can restore crown fracture of an anterior tooth. In this study, sheep central incisors were used. The crowns were fractured transversely and the crown fragment was bonded to the remaining tooth structure. This technique involves acid etching, use of an experimental adhesive (Gluma+) and a BisGMA/TEGDMA resin. The mean fracture strength of the restored teeth was not significantly different from that of intact teeth when tested at a rather low crosshead speed (0.5 mm/min) but different and about 30% lower when tested at a higher crosshead speed (500 mm/min). In studies aiming to test resistance to forces which might cause trauma, it might be appropriate to use a high crosshead speed.

Acid Etching, Dental↗
PubMedDate not supplied

Load fatigue of five restoration modalities in structurally compromised premolars.

Twenty-five freshly extracted maxillary first premolars were divided equally among five modalities for rebuilding structurally compromised premolars. These modalities were: (A) buccal stainless steel Parapost/amalgam core, (B) palatal stainless steel parapost/amalgam core, (C) two stainless steel Paraposts/amalgam core, (D) two regular Link Plus TMS single-shear Minim pins/amalgam core, and (E) palatal cast gold post and core. Load fatigue was used as the testing protocol, using a 5.2-kg load applied at 72 cycles per minute. Each tooth was prepared with a 1.0-mm ferrule, and an upper limit of 250,000 load cycles was set for the testing. Two failures were exhibited, (1) preliminary failure which involved a crack in the luting cement layer, and (2) catastrophic failure wherein the core and crown separated from the root section. Statistical analysis using Kruskal-Wallis test showed three subsets (P < or = .05). The subset with the highest number of load cycles to failure contained the palatal stainless steel post/amalgam core, two stainless steel Paraposts/amalgam core, and palatal cast gold post and core.

Bicuspid↗
PubMed1999

Debonding of adhesively restored deep Class II MOD restorations after functional loading.

PURPOSE: To assess debonding due to functional loading at the cervical dentin margins of deep Class II MOD restorations prepared with a variety of adhesive restoratives in endodontically-treated teeth. MATERIALS AND METHODS: MOD preparations and endodontic treatment were carried out on extracted sound maxillary premolars. The cavities were restored with seven material combinations: Three different resin-based composites (RBC) (Z100, Herculite XRV or Clearfil RP with their respective bonding systems); two bonded amalgam combinations (Valiant with Superbond D or with Panavia 21) and two sandwich combinations [the RBC Tetric with the polyacid-modified RBC (compomer) Compoglass or Z100 with the resin-modified glass ionomer Fuji II LC]. For each group, half of the samples were exposed to mechanical functional loading and the other half served as control. Imperfect bond formation and debonding due to loading was determined by dye penetration. In addition, the dye penetration scores were correlated with the cusp fracture strengths of similarly prepared restorations of a previous study. RESULTS: After functional loading, the RBC in combination with hybridizing dentin bonding agents showed better preservation of marginal integrity than the sandwich restorations, which in turn performed better than the amalgam restorations (P < 0.05). Debonding correlated with reduction in fracture resistance. Under the conditions of this study, debonding of adhesive MOD restorations by functional loading can best be prevented by using RBC in combination with hybridizing dentin-bonding systems.

Analysis of Variance↗
PubMed1999

Shear bond strength of composite resin and amalgam adhesive systems to dentin.

PURPOSE: To determine the effects of several multi-purpose dental adhesive systems on the shear bond strength of both composite resin (Herculite XRV) and amalgam (Tytin) to dentin. MATERIALS AND METHODS: 160 extracted human molar teeth were randomly assigned to 16 treatment groups (n = 10/group), embedded in resin, and ground flat on both the occlusal and apical surfaces to expose a 3.0 mm thickness of dentin. In each specimen, a 3.18 mm diameter channel was drilled through the dentin perpendicular to the ground surface. The cylindrical preparations were treated with one of seven adhesive systems or one of two controls (37% H3PO4 or Copalite varnish) according to manufacturers' recommendation, then restored with either composite resin or amalgam. Specimens were thermocycled and subjected to a punch-out shear force using a materials testing machine. RESULTS: All examined multi-purpose adhesive systems provided increased shear bond strength in comparison to the controls. Although the individual performance of each adhesive system varied with specific restorative materials, OptiBond FL demonstrated the highest mean shear bond strength to both composite resin and amalgam. Mean amalgam shear bond strength was significantly greater than mean composite resin strengths.

Acid Etching, Dental↗
PubMed1998

Handling of mechanical stresses in composite restorations.

The origin of stress in adhesive resin composite restorations is attributed to restrained shrinkage during polymerization and is dependent on the configuration of the restoration. Moreover, non-homogeneous deformations during functional loading can damage the interface as well as the coherence of the material. Damage from these stresses can be reduced by application of an elastic lining at the adhesive interfaces and by slowing the initial conversion by two-step light initiation of the resin. The various factors that mediate flow and compliance are discussed.

Composite Resins↗
PubMed1976

Creep in amalgam class V restorations.

The purpose of the investigation was to examine the creep rate in an amalgam Class V restoration. The stresses in a central bucco-lingual plane of a loaded bicuspid with a Class V restoration were computed with aid of the finite element method. When the stresses were known, the creep rate was calculated. The results showed that the creep rate of a load of 150 N varied between 0.6% and 3.5% per 104 s for amalgams with large differences between their viscoelastic behaviors. A gap between the restoration and the cavity margin will thus occur if a tooth is often heavily loaded.

Bicuspid↗
PubMed2000

Medicaid costs associated with the hospitalization of young children for restorative dental treatment under general anesthesia.

OBJECTIVE: This paper examines the cost to the Iowa Medicaid program of hospitalizing young children for restorative dental care under general anesthesia, and describes the dental services received in this setting. METHODS: Medicaid dental claims for young children receiving restorative dental care under general anesthesia during fiscal year 1994 were matched with corresponding hospital and anesthesia claims. RESULTS: The total cost to the Medicaid program of treating a child in the hospital under general anesthesia was $2,009 per case. Less than 2 percent of Medicaid-enrolled children under 6 years of age who received any dental service accounted for 25 percent of all dollars spent on dental services for this age group, including hospital and anesthesia care. The most frequent type of procedure was stainless steel crowns (SSCs), with an average of almost six per case. CONCLUSIONS: Early identification, prevention, and intervention are critically important to prevent the costly treatment of children with ECC in hospital operating rooms.

Age Factors↗
PubMed1999

Dazzle camouflage.

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Composite Resins↗