Biomedical subjects

G Pourroy

Publications and source records attributed to G Pourroy.

4 recordsLinked to original sources

PubMed2004

[Sodium fluoride controlled release system for intra buccal use].

Hydroxyapatite which has the same elemental chemical composition as natural bone and teeth is one of the promising raw material for the design of drug controlled release system in intrabuccal use. It is stable and biocompatible and widely used in orthopedics and odontology. So, in order to improve the administration of drugs for intrabuccal use, we have developped a fluoride controlled release delivering system. We have formulated tablets of 160 to 200 mg to be fixed on the vestibular face of a molar or a premolar and permitting to reach high enough local concentrations for desirable therapeutic effect. The tablets have a granular matrix composed of hydroxyapatite and fillers, ethylcellulose and/or Eudragit. For all tablets, the pharmacotechnical values support the pharmacopoeia norms. On fragments of tissue maintained in culture, the sodium fluoride is released at constant rate. The release profiles observed are predictable. No disintegration of tablets have been observed during release studies and after. Histological analyses performed after release studies showed the biocompatibility qualities of the tablets.

Administration, Topical↗

PubMed2003

Fluoride controlled release tablets for intrabuccal use.

We have developed a fluoride controlled release delivering system for intrabuccal use, permitting to reach high enough local concentrations for desirable therapeutic effect with minimal side effects. We have formulated tablets of 160-200mg intended to be fixed on a tooth. The tablets have a granular matrix composed of pure hydroxyapatite, Eudragit((R)) and/or ethylcellulose. NaF is added either by a mechanical mixing or an impregnation method. Profiles of continuous in vitro drug release in saline phosphate buffered solution were recorded by means of a fluoride selective electrode. Linear profiles are observed when ethylcellulose is used. The most reproducible results are obtained when the impregnation method is used. Eudragit((R)) increases the dissolution efficiencies while ethylcellulose decreases it.

Administration, Buccal↗

PubMed1998

Elaboration and evaluation of an intraoral controlled release delivering system.

In order to improve the administration of drugs for all pathology of the oral cavity, we have developed an intraoral controlled release delivering system, permitting to reach high enough local concentrations for desirable therapeutic effect with minimal side effects. We have formulated tablets of 200 mg intended to be fixed on a tooth. These tablets resist food and drink attacks. The tablets we elaborated have a granular matrix composed of hydroxyapatite, ethyl cellulose and Eudragit. Zinc sulfate is used as the first model of an active drug, it has a therapeutic effect on buccal mucous. Profiles of continuous in-vitro drug release in distilled water at 37 degrees C show that zinc sulfate release by the matrix structure for the different tablet formulations is regulated by the proportions of the different components.

Acrylic Resins↗

PubMed1998

[Development and evaluation of an active substance controlled-release device for use in the oral cavity].

In order to improve drug administration for diseases of the oral cavity, we have developed an intraoral controlled release delivery system enabling local concentrations high enough for desirable therapeutic effect with minimal side effects. We have formulated 200 mg tablets to be fixed on a tooth. These tablets resist attacks by food and beverages. The tablets have a granular matrix composed of hydroxyapatite, ethyl cellulose and Eudragit. Zinc sulfate, which has a therapeutic effect on the buccal mucosa was used as the first model of an active drug. Profiles of continuous in vitro drug release in distilled water at 37 degrees C show that zinc sulfate release by the matrix structure for the different tablet formulations is regulated by the proportions of the different components.

Acrylic Resins↗