A new non-invasive preventive measure in cariology: laser-based tooth coating. Investigation of tooth-protective, material science and laser technical aspects.
Coating and Surface Technology
Final Report Abstract
The aim of this project was to develop a new non-invasive tooth surface coating procedure for achieving an increased caries and erosion protection, on predilection tooth sites of patients at high risk for caries or exaggerated dental erosion. For this, a laser-based method was investigated, which allows the transformation of materials applied on the tooth surface into a ceramic protective layer. As this is a complex interdisciplinary project involving at least three different substrates (enamel, dentin and a newly developed glass ceramic) and their interactions with laser radiation; a systematical approach was chosen by dividing the main research question into two separate blocks. In one block the questions regarding: 1) the tooth-laser interactions and in the other block the questions regarding 2) the glass ceramic-laser interactions. In this way enough knowledge could be generated for these two main aspects, before the complex task of bringing them all together (tooth, ceramic and laser) in a tooth coating strategy could be performed in the most optimized way. With regard to the tooth-laser interaction the gained knowledge up to now allow us to control excessive pulp heating, minimize morphological changes, while significantly increasing enamel acid resistance. As regards the glass ceramic-laser interactions, a tailored glass-ceramic material was synthesized and characterized that is suitable in principle to be applied as thin film onto hydroxyapatite and (bovine) enamel substrates by laser-sintering. On the enamel samples a tight bonding between the substrate and the glass ceramic coating material was proved. However, small cracks below the interface zones indicate a need for further improvement of the glass-ceramic material and the adaptation of the laser sintering process. The glass-ceramic coating material needs to be adapted more precisely to the thermal expansion properties of human enamel. Moreover, the laser process requires as well further adaption for completely crack-free interfacial zones. At the moment we could indeed find a combination of glass ceramic material and laser sintering parameters that resulted in a thin and well-adhered coating to enamel. However, with the knowledge gained up to now, it became also clear that both from the material science as well as from the laser technology side optimizations can be done, in order to assure biological safety for the tooth substrates (pulp vitality and absence of morphological damage) and to achieve even better adhesion of the coating material. However, the obtained results showed a great potential for a future clinical use as an innovative non-invasive caries and erosion protective therapy. This is true both for the achievement of the best possible laser-enamel interaction, allowing highest enamel acid-resistance and potentializing effect of fluoride and metal ions like stannous, as well as for the achieving a tooth-coating approach using a glass ceramic thin coat. Especially the complete tooth-coating approach shows great potential for offering significant more durable results than the currently available preventive strategies. Therefore it is for sure our intention to continue the research in this very promising topic.
Publications
- Beschichtungswerkstoff aus Glaskeramik für die CO2-Laser-basierte Herstellung von Dünnschichten zur Karies- und Erosionsprävention (Abstract D14). Deutsche Zahnärztliche Zeitschrift (DZZ) 2016; 71(5):1-36
Bilandzic M, Wollgarten S, Stollenwerk J, Fischer H
- Einfluss einer non-invasiven Laserscanningstrategie auf die Temperatur der Zahnoberfläche und der Pulpa sowie die Zahnmorphologie (Abstract D9). Deutsche Zahnärztliche Zeitschrift (DZZ) 2016; 71(5):1-36
Esteves-Oliveira M, Liebegall S, Wollgarten S, Bilandzic M, Meyer-Lückel H, Fischer H, Stollenwerk J
- A new laser-processing strategy for improving enamel erosion resistance. Journal of Dental Research 2017;96:1168-1175
Esteves-Oliveira M, Wollgarten S, Liebegall S, Jansen P, Bilandzic M, Meyer-Lueckel H, H. Fischer H, Stollenwerk J, Poprawe R
(See online at https://doi.org/10.1177/0022034517718532) - Eine neue automatisierte Laserscanningstrategie kombiniert mit einer zinnhaltigen Fluoridlösung reduziert Schmelzerosion in vitro (Abstract D9). Deutsche Zahnärztliche Zeitschrift (DZZ) 2017; 72(5):1-40
Esteves-Oliveira M, Schrotter G, Wollgarten S, Meyer-Lueckel H, Stollenwerk J, Poprawe R.
- Glassceramic coating material for the CO2 laser based sintering of thin films as caries and erosion protection. Dental Materials 2017;33:995-1003
Bilandzic MD, Wollgarten S, Stollenwerk J, Poprawe R, Esteves-Oliveira M, Fischer H
(See online at https://doi.org/10.1016/j.dental.2017.06.008) - Impact of CO2 laser irradiation on enamel and dentin biofilm-induced mineral loss. Clinical Oral Investigations1, 2017 May;21(4):1243-1250
Esteves-Oliveira M, El-Sayed KF, Dörfer C, Schwendicke F
(See online at https://doi.org/10.1007/s00784-016-1893-1) - Impact of heating from 100- 500 °C on enamel erosion resistance (Abstract 36).Caries Res 2017;51:1–96
Esteves-Oliveira M, Glökler J, Bilandzic M., Meyer-Lueckel H
- Influence of an Automatic Laser Scanning Strategy on Enamel Erosion. Journal of Dental Research 2017, 96(Spec Iss A):0378
Esteves-Oliveira M, Wollgarten S, Bilandzic M, Meyer-Lückel H, Fischer H, Stollenwerk J, Poprawe R
- Mineral phase changes in dental enamel after furnace heating and CO2 laser irradiation (Abstract 35). Caries Res 2017;51:1–96
Jansen P, Bilandzic M, Wollgarten S, Meyer-Lueckel H, Fischer H, Stollenwerk J, Poprawe R, Esteves-Oliveira M
