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Effect of a hydroxyl ion-releasing composite resin on plaque acidogenicity
Umeå University, Faculty of Medicine, Odontology, Dental Hygiene.
Umeå University, Faculty of Medicine, Odontology, Dental Hygiene.
2005 (English)In: Caries Research, ISSN 0008-6568, E-ISSN 1421-976X, Vol. 39, no 3, 201-206 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this in vivo study was to evaluate the neutralizing capacity, registered as change of plaque acidogenicity, on aged proximal restorations of an ion-releasing composite resin (IRCR), which releases hydroxyl, calcium, and fluoride ions at low pH. Twenty patients, with a mean age of 63 years (range 43-85), participated. All had one aged proximal IRCR restoration (mean age 15 months) and one nonrestored enamel surface to make an intraindividual comparison possible. The neutralizing effect of the IRCR was evaluated by measuring plaque pH, using the microtouch method, after a mouthrinse with 10% sucrose. The plaque pH measurements were repeated 1.5 years later on the IRCR (mean age 34 months), the enamel surfaces and a universal hybrid composite resin (CR). At both 15 and 34 months, the plaque on the IRCR surfaces showed the least acidogenic potential for the whole 60-min time interval. The largest differences between the IRCR, CR and enamel were found during the first 15 min. At 15 months, the total areas under the plaque pH curve (AUC(5.7) and AUC(6.2)) differed significantly between the IRCR and enamel surfaces for the time periods 0-5 min and 5-15 min. At 34 months, significant differences were found between IRCR and CR at the 0- to 5-min time period. It can be concluded that IRCR restorations countered the plaque pH fall and maintained it at levels where less enamel and dentin demineralization can occur. Copyright (c) 2005 S. Karger AG, Basel.

Place, publisher, year, edition, pages
2005. Vol. 39, no 3, 201-206 p.
Identifiers
URN: urn:nbn:se:umu:diva-17147DOI: 10.1159/000084799PubMedID: 15914982OAI: oai:DiVA.org:umu-17147DiVA: diva2:156820
Available from: 2007-11-06 Created: 2007-11-06 Last updated: 2017-12-14Bibliographically approved
In thesis
1. In vivo evaluations of the neutralizing effect of a hydroxyl ion-releasing resin composite and a prophylactic gel on plaque acidogenicity: measured by the microtouch method
Open this publication in new window or tab >>In vivo evaluations of the neutralizing effect of a hydroxyl ion-releasing resin composite and a prophylactic gel on plaque acidogenicity: measured by the microtouch method
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The prevalence of dental caries has decreased dramatically in most developed countries since the sixties and the number of remaining teeth in adults has increased during the last decades. Elderly as a group will during aging become an increasing risk group for caries. Especially older individuals with hyposalivation are at increased risk for coronal and root caries and need increased oral care. A large part of the time spent by the dental team is occupied by prevention and treatment of secondary caries, which is the main reason of replacement or repair of restorations. Traditionally, prevention of caries is directed against the different risk factors of the individual such as oral hygiene, intake of fermentable carbohydrates, cariogenic microflora and oral dryness. In some restorative materials the release of fluoride can be used to decrease the risk of secondary caries alone or in combination with other preventive methods. New alternative preventive methods are necessary to complete traditional methods in order to decrease the caries risk in elderly and/or to prevent secondary caries. Addition of methods with buffering properties have been suggested and developed to supplement the biological buffering capacity of saliva.

The neutralizing effects of a hydroxyl ion-releasing resin composite and a prophylactic gel containing buffering properties on dental plaque acidogenicity was evaluated by the microtouch method.

In this method, a skin reference electrode was validated in comparison with a glass capillary reference electrode and used in the subsequent studies. Change of plaque acidogenicity on proximal surfaces of aged restorations of the hydroxyl ion-releasing resin composite was compared intra-individually a conventional hybrid resin composite and a non-filled enamel proximal surface. Relative frequencies of cariogenic microorganisms in plaque on these surfaces were studied. The effect of a single application of the prophylactic gel with buffering substances was evaluated on plaque acidogenicity in healthy individuals with low and normal salivary secretion rate. It was compared intra-individually with the same gel without buffering substances. The effect of multiple applications of the prophylactic gel on plaque acidogenicity was studied in institutionalized elderly individuals with subjectively reported oral dryness and compared intra-individually with the same gel without buffering substances.

Major results and conclusions from the studies are:

• The use of the skin reference electrode, in combination with the microtouch electrode, showed high validity in comparison with the conventional glass capillary reference electrode

• The hydroxyl ion-releasing composite resin countered plaque acidogenicity fall at two time points of the aged restorations and maintained it at levels where lesser demineralization occurs. No influence of the ion-release on the amount of cariogenic plaque microorganisms on the resin composite surface was observed

• A single application of the prophylactic gel with buffering substances showed a neutralizing effect of plaque pH in healthy individuals with normal salivary secretion rate. No effect was observed in low secretion rate individuals.

• Multiple applications of the prophylactic gel did not neutralize dental plaque acidogenicity in elderly individuals with subjective oral dryness

Place, publisher, year, edition, pages
Umeå: Odontologi, 2006. 49 p.
Series
Umeå University odontological dissertations, ISSN 0345-7532 ; 93
Keyword
caries, clinical, buffering, elderly, plaque pH, resin composite, restorations, microorganisms
National Category
Dentistry
Identifiers
urn:nbn:se:umu:diva-945 (URN)91-7264-152-5 (ISBN)
Public defence
2006-12-15, Sal B, Tandlökarhögskolan, 90187, Umeå, 09:00 (English)
Opponent
Supervisors
Available from: 2006-11-24 Created: 2006-11-24 Last updated: 2009-08-20Bibliographically approved

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