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Results for “DENTAL PULP CAPPING”

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PubMed1999

The effect of physiological root resorption on repair potential of primary tooth pulp.

The aim of this study was to determine, the effects of root resorption on repair potential of healthy deciduous tooth pulps. Fourteen canine teeth which needed to be extracted for orthodontic purposes and in which resorption had just begun (1st group, resorption did not exceed 1/3 of root length) or was in advanced resorption stage (2nd group, resorption was between 1/3 and 2/3 of root length) were used for this study. Direct pulp capping treatment was implemented in vivo, to 7 teeth in each group. Reparative dentin formation was determined three months later following extraction. The teeth were examined histopathologically under light microscope. As a result, in the teeth with different resorption levels, dentin bridge formation in the capping area was observed. Although maturation of the thin dentin bridges was completed in all teeth, maturation of the thick dentin bridges was still continuing at the 90th day.

Adolescent↗
PubMed2005

Development of self-setting Te-Cp/alpha-TCP cement for pulpotomy.

As an alternative to calcium hydroxide used as a direct capping agent, calcium phosphate cement that consisted of tetracalcium phosphate and alpha-tricalcium phosphate (Te-CP/alpha-TCP) at different molar ratios was developed with a one-step method, in which heating was performed only one time. Alkalinity could be adjusted easily by changing the Te-CP/alpha-TCP ratio, whereby the mixing ratio of simple chemicals such as calcium carbonate and dicalcium phosphate dihydrate was changed. When mixed with a solution of 1 mol/L sodium dihydrogen phosphate, the cement set forming carbonate-containing apatite in revised, simulated body fluid (R-SBF)--which served to mimic the tissue fluid in dental pulp. The pH of the solution never exceeded 8.0 in the presence of the set cement even after about one month of storage. In contrast, with calcium hydroxide, the pH of R-SBF reached almost 12.0 on day 1 and remained at that value till the end of immersion. These findings clearly suggested that with Te-CP/alpha-TCP cement, its alkalinity would never exceed that of calcium hydroxide and that it would provide a mildly alkaline environment.

Body Fluids↗
PubMed2000

Human pulp reaction to dentine bonded amalgam restorations: a histologic study.

OBJECTIVE: The aim of this study was to investigate the human pulp response to Scotchbond Multi Purpose Plus (SMPP) bonding agent in non-exposed Class V cavities. METHODS: SMPP was placed in 24 of 40 cavites according to manufacturer's instructions and the cavities were restored with amalgam. The remaining 16 cavities were capped with a calcium hydroxide formulation (Dycal) sealed with zinc-oxide eugenol, and restored with the amalgam. After extraction at 10 and 35 days, the teeth were fixed, sectioned and stained for light microscopy. RESULTS: All Dycal-capped teeth, at both 10 and 35 days, exhibited no pulp inflammation and no demonstrable bacteria. Six cases sealed with SMPP at 10 days showed no pulp inflammation or stained bacterial profiles. The remaining six teeth demonstrated mild to moderate inflammatory pulpal responses and five out of these six cases exhibited stained bacterial profiles. Nine out of 12 teeth showed no inflammatory pulp responses at 35 days, the remaining three cases exhibited mild to moderate pulp inflammation without stained bacteria. CONCLUSIONS: None of the teeth sealed with SMPP presented severe inflammatory pulpal reactions histologically. SMPP did not exhibit significant deleterious effects on the human pulp tissue during the test periods.

Adolescent↗
PubMed1971

Pulp capping.

Explore the source record for details and available documents.

Dental Pulp Capping↗
PubMed2002

Clinical evaluation of two "packable" posterior composite resins.

The purpose of this study was to evaluate the clinical performance of two "packable" posterior composites: Prodigy Condensable (P) (Kerr) and Definite (D) (Degussa). Thirty-six patients participated in the study. A total of 78 restorations were made, 40 with D and 38 with P. Each patient received at least two restorations, one of each studied material. The materials were handled according to the manufacturer's instructions. The restorations were finished and polished after 1 week. They were evaluated at baseline and after 1 year by two independent evaluators using the United States Public Health Service (USPHS) criteria. Colored slides were made of all the restorations. After 1 year, 35 patients and 76 restorations (39 with D and 37 with P) were available for evaluation. All restorations received A criteria except the following ones, which received B criteria: color P (one restoration) and D (one restoration), marginal staining P (three restorations) and D (two restorations), surface staining P (nine restorations) and D (three restorations), anatomic form P (one restoration) and D (three restorations), and marginal adaptation P (one restoration) and D (eight restorations). The obtained data were tabulated and statistically analyzed using the Fisher and McNemar tests. After 1 year, P showed a significant increase in superficial staining. For D, the marginal adaptation became significantly worse than baseline and P. The studied materials can be considered acceptable during this evaluation period. Further evaluations are necessary for a better clinical performance analysis.

Acid Etching, Dental↗
PubMed1991

Pulpal response to chemically cured and experimental light-cured glass ionomer cavity liners.

This investigation evaluated the effects of an experimental light-cured glass ionomer (LCGI) cavity liner and chemically cured Ketac-Bond glass ionomer restorative material on the pulpal tissues of monkeys. Class V cavities were prepared in 71 teeth of three adult Macaca mulatta monkeys at 7- and 35-day intervals. Ketac-Bond or LCGI cavity liners were placed in cavities with the smear layer intact (groups I and II) or with the smear layer removed (groups III and IV) and were restored with composite resin. Tissues were acquired, sectioned at 7 microns, stained for microscopic evaluation, or prepared for SEM evaluation. No statistically significant differences between materials existed at either time interval, regardless of smear layer presence. Histopathologic results demonstrated minimal pulpal reactions for groups I through IV. SEM analysis showed tenacious bonding of the LCGI material to prepared cavity walls, with absence of contraction gap formation. The results indicated excellent pulpal responses to both materials.

Acid Etching, Dental↗
PubMed2006

The impact of bioactive molecules to stimulate tooth repair and regeneration as part of restorative dentistry.

After implantation in the exposed pulp, some molecules of the den-tin extracellular matrix induce the formation of a reparative dentinal bridge in the coronal pulp. In some cases, total occlusion of the root canal also is observed. This is the case for bone sialoprotein, bone morphogenetic protein-7, Dentonin (a fragment from matrix extracellular phosphoglycoprotein), and two small amelogenin gene splice products (A+4 and A-4). Cells implicated in the reparative process are recruited, proliferate, and differentiate into osteoblast-like and odontoblast-like cells. The same results may be obtained by direct implantation of odontoblast progenitor cell into the pulp.

Animals↗
PubMed1998

Effects on human maximum bite force of biting on a softer or harder object.

A recent study concluded that the pulps of human incisor teeth may contain mechanoreceptors. These provide the input for a protective mechanism that reflexly limits the maximum bite force by monitoring the stress on compressed dentine. In separate experiments it was later shown that individuals can accurately detect whether they are biting on a harder or softer surface when it seemed that the only receptors which could have detected the difference must have been in the tooth pulps. Thus, pulpal mechanoreceptors may be used subconsciously to limit the maximum bite force and consciously to detect differences in hardness. If these conclusions are correct the maximum bite force should be larger when incising on a soft (rubber) surface than on a hard (acrylic) surface because when the teeth sink into the rubber the bite force is spread over a larger area, thereby reducing the local stress. A reduction in stress allows an increase in bite force. But if the tooth were previously covered with an acrylic crown, which would already reduce the stress by distributing the bite force over a large area of the incisor crown, there would be little or no difference in the maximum bite force whether biting on rubber or acrylic. The results of experiments on 15 participants confirm these predictions and support the hypothesis that the pulps of human incisors contain high-threshold mechanoreceptors.

Adult↗
PubMed2001

Composite resin restoration and postoperative sensitivity: clinical follow-up in an undergraduate program.

OBJECTIVES: To analyze the relationship between the cavity depth and liners with postoperative sensitivity of resin composite restorations. METHODS: A clinical follow-up was conducted on 319 resin composite restorations made in the final year of an undergraduate program over a 3-year period. Along with the analyses of cavity type, cavity depth, type of pulpal protection and the materials used, the postoperative sensitivity was also examined on each restoration. RESULTS: Thirty-nine percent of the restorations had no protective layer (Group 1). As the depth of the prepared cavities increased, the restorations received one of the three pulpal protection methods; a calcium hydroxide base (Group 2), glass ionomer cement (Group 3), or protection with a calcium hydroxide base in combination with glass ionomer cement (Group 4). The incidence of postoperative sensitivity showed no significant difference among Groups 1, 2 and 3, but was significantly lower in Group 1 than in Group 4. The restorations made in shallow and medium depth cavities demonstrated significantly less-postoperative sensitivity than those made in deep cavities. The newer generation dentine-bonding agents showed a significantly lower incidence of postoperative sensitivity than the early generation group. CONCLUSIONS: Postoperative sensitivity in resin composite restorations was not related to the absence of protective layers but increased with the depth of cavities restored with the resin composite. The type of dentine-bonding agents could also be responsible for postoperative sensitivity.

Adolescent↗
PubMedDate not supplied

Volume of the internal gap formed under composite restorations in vitro.

OBJECTIVES: The gap that develops at the interface of dentin composite restoration during the polymerization of the resin can be subsequently filled by fluid filtrating from the pulp via the dentinal tubules. This in vitro study was designed to determine the volume of such a gap, at the occlusal floor of class I restoration and as a result of different dentin treatments and restoration procedures. METHODS: Fifty-six human third molars had their pulp chambers first sealed and connected to a hydraulic apparatus permitting microlitre fluid shift recordings. The teeth then received class I cavities of uniform dimensions and were sampled into nine groups for three dentin treatments (bonding with a dentin bonding agent, lining with a resin modified light-cured glass ionomer, lining with a zinc phosphate cement) and three restoration procedures (Bulk placement of the composite material, Multilayer, Indirect inlay). Fluid displacements were recorded during the filling procedures and stopped 30 min after the completion of the restorations. RESULTS: Dentin bonding agent treated cavities consistently presented the smallest gap volumes, followed by the GI and the ZnPO4 lined specimen. Multilayer and Indirect restoration techniques reduced the formation of gaps. CONCLUSIONS: None of the materials or techniques tested assured a gap-free interface and more effort should be directed at increasing the adhesive and sealing properties of restorative materials to be placed on the dentin.

Adhesives↗