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Health Sciences staff profiles

Associate Professor Geoffrey Tompkins

PositionAssociate Professor
DepartmentDepartment of Oral Sciences
QualificationsBSc PhD PGDipSci (Otago)
Research summaryDental molecular microbiology

Research

As a microbiologist employed in the Faculty of Dentistry, Associate Professor Tompkins' research is focused on dental microbiology. Much of his research involves providing microbiological support in collaborative studies with clinicians undertaking applied research, because most of our postgraduate students are involved in clinical (or translational) research (and do not have the background and training for more fundamental microbiology research). As such, Associate Professor Tompkins' research platform is highly varied, having been involved in dental forensics, endodontic, implant, restorative and proprietary (AgResearch) research. His work on bite mark analysis (forensics) is recognised internationally to the point that he has twice been invited to contribute to what is currently regarded as the definitive publication in the field; the significance of his bite mark research was acknowledged in The Lancet (2006). A more recent publication describing a convenient and rapid method to quantify bacterial survival in dentinal tubules following endodontic treatment promises a significant technical advance in the field.

Publications

Chew, M., Tompkins, G., Tawse-Smith, A., Waddell, N., & Ma, S. (2018). Reusing titanium healing abutments: Comparison of two decontamination methods. International Journal of Prosthodontics, 31(6), 613-618. doi: 10.11607/ijp.5881

Schwass, D. R., Lyons, K. M., Love, R., Tompkins, G. R., & Meledandri, C. J. (2018). Antimicrobial activity of a colloidal AgNP suspension demonstrated in vitro against monoculture biofilms: Toward a novel tooth disinfectant for treating dental caries. Advances in Dental Research, 29(1), 117-123. doi: 10.1177/0022034517736495

Hsu, B., Lee, S., Schwass, D., & Tompkins, G. (2017). Antimicrobial activity of chemomechanical gingival retraction products. Journal of the American Dental Association, 148(7), 493-499. doi: 10.1016/j.adaj.2017.03.006

Safii, S. H., Tompkins, G. R., & Duncan, W. J. (2017). Periodontal application of Manuka honey: Antimicrobial and demineralising effects In Vitro. International Journal of Dentistry, 2017, 9874535. doi: 10.1155/2017/9874535

Kim, K. H., Loch, C., Waddell, J. N., Tompkins, G., & Schwass, D. (2017). Surface characteristics and biofilm development on selected dental ceramic materials. International Journal of Dentistry, 2017, 7627945. doi: 10.1155/2017/7627945

Chapter in Book - Research

Tompkins, G. R. (2011). Genotypic comparison of bacterial DNA recovered from bitemarks and teeth. In R. B. J. Dorion (Ed.), Bitemark evidence: A color atlas and text. (2nd ed.) Boca Raton, FL: CRC Press.

Aziz, A., Parmar, D., McNaughton, A., & Tompkins, G. R. (2010). Bacterial viability determination in a dentinal tubule infection model by confocal laser scanning microscopy. In G. J. Seymour, M. P. Cullinan & N. C. K. Heng (Eds.), Oral Biology. (pp. 141-150). New York: Springer. doi: 10.1007/978-1-60761-820-1_10

Tompkins, G. R. (2005). Genotypic comparison of oral bacteria isolated from bitemarks and teeth. In R. B. J. Dorion (Ed.), Bitemark evidence. (pp. 593-599). New York, NY, USA: Marcel Dekker.

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Journal - Research Article

Chew, M., Tompkins, G., Tawse-Smith, A., Waddell, N., & Ma, S. (2018). Reusing titanium healing abutments: Comparison of two decontamination methods. International Journal of Prosthodontics, 31(6), 613-618. doi: 10.11607/ijp.5881

Schwass, D. R., Lyons, K. M., Love, R., Tompkins, G. R., & Meledandri, C. J. (2018). Antimicrobial activity of a colloidal AgNP suspension demonstrated in vitro against monoculture biofilms: Toward a novel tooth disinfectant for treating dental caries. Advances in Dental Research, 29(1), 117-123. doi: 10.1177/0022034517736495

Hsu, B., Lee, S., Schwass, D., & Tompkins, G. (2017). Antimicrobial activity of chemomechanical gingival retraction products. Journal of the American Dental Association, 148(7), 493-499. doi: 10.1016/j.adaj.2017.03.006

Kim, K. H., Loch, C., Waddell, J. N., Tompkins, G., & Schwass, D. (2017). Surface characteristics and biofilm development on selected dental ceramic materials. International Journal of Dentistry, 2017, 7627945. doi: 10.1155/2017/7627945

Safii, S. H., Tompkins, G. R., & Duncan, W. J. (2017). Periodontal application of Manuka honey: Antimicrobial and demineralising effects In Vitro. International Journal of Dentistry, 2017, 9874535. doi: 10.1155/2017/9874535

Tawse-Smith, A., Atieh, M. A., Tompkins, G., Duncan, W. J., Reid, M. R., & Stirling, C. H. (2016). The effect of piezoelectric ultrasonic instrumentation on titanium discs: A microscopy and trace elemental analysis in vitro study. International Journal of Dental Hygiene, 14(3), 191-201. doi: 10.1111/idh.12142

Wong, S., Mundy, L., Chandler, N., Upritchard, J., Purton, D., & Tompkins, G. (2014). Antibacterial properties of root canal lubricants: A comparison with commonly used irrigants. Australian Endodontic Journal, 40, 111-115. doi: 10.1111/aej.12075

Tawse-Smith, A., Khosa, A., Kamel, M. S., Duncan, W. J., Swain, M., & Tompkins, G. (2014). Bacterial colonization of titaniu discs: A pilot study for evaluating implant surface deterioration. Brazilian Journal of Periodontology, 24(1), 14-23.

Russell, A. A., Chandler, N. P., Hauman, C., Siddiqui, A. Y., & Tompkins, G. R. (2013). The butterfly effect: An investigation of sectioned roots. Journal of Endodontics, 39(2), 208-210. doi: 10.1016/j.joen.2012.09.016

Hsu, L., Power, D., Upritchard, J., Burton, J., Friedlander, R., Horswell, J., … Kieser, J., & Tompkins, G. (2012). Amplification of oral streptococcal DNA from human incisors and bite marks. Current Microbiology, 65(2), 207-211. doi: 10.1007/s00284-012-0148-x

Kennedy, D. M., Stanton, J.-A. L., García, J. A., Mason, C., Rand, C. J., Kieser, J. A., & Tompkins, G. R. (2012). Microbial analysis of bite marks by sequence comparison of streptococcal DNA. PLoS ONE, 7(12), e51757. doi: 10.1371/journal.pone.0051757

Aziz, A., Chandler, N. P., Hauman, C. H. J., Leichter, J. W., McNaughton, A., & Tompkins, G. R. (2012). Infection of apical dentin and root-end cavity disinfection. Journal of Endodontics, 38(10), 1387-1390. doi: 10.1016/j.joen.2012.06.034

Peters, N., Tawse Smith, A., Leichter, J., & Tompkins, G. (2012). Laser therapy: The future of peri-implantitis management. Brazilian Journal of Periodontology, 222(1), 26-33.

Matejka, K. M., Bremer, P. J., Tompkins, G. R., & Brooks, H. J. L. (2012). Antibiotic susceptibility of Moraxella catarrhalis biofilms in a continuous flow model. Diagnostic Microbiology & Infectious Disease, 74, 394-398. doi: 10.1016/j.diagmicrobio.2012.08.021

Parmar, D., Hauman, C. H. J., Leichter, J. W., McNaughton, A., & Tompkins, G. R. (2011). Bacterial localization and viability assessment in human ex vivo dentinal tubules by fluorescence confocal laser scanning microscopy. International Endodontic Journal, 44(7), 644-651. doi: 10.1111/j.1365-2591.2011.01867.x

Power, D. A., Cordiner, S. J., Kieser, J. A., Tompkins, G. R., & Horswell, J. (2010). PCR-based detection of salivary bacteria as a marker of expirated blood. Science and Justice, 50(2), 59-63. doi: 10.1016/j.scijus.2009.04.006

Heng, N. C. K., Tagg, J. R., & Tompkins, G. R. (2007). Competence-dependent bacteriocin production by Streptococcus gordonii DL1 (Challis). Journal of Bacteriology, 189(4), 1468-1472.

Heng, N. C. K., Tagg, J. R., & Tompkins, G. R. (2006). Identification and characterization of the loci encoding the competence-associated alternative σ factor of Streptococcus gordonii. FEMS Microbiology Letters, 259(1), 27-34.

Rahimi, M., Heng, N. C. K., Kieser, J. A., & Tompkins, G. R. (2005). Genotypic comparison of bacteria recovered from human bite marks and teeth using arbitrarily primed PCR. Journal of Applied Microbiology, 99, 1265-1270.

Kieser, J., Tompkins, G., Buckingham, D., Firth, N. A., & Swain, M. (2005). Bitemarks: Presentation, analysis, and evidential reliability. Forensic Pathology Reviews, 3, 157-179.

Khalessi, A. M., Pack, A. R. C., Thomson, W. M., & Tompkins, G. R. (2004). An in vivo study of the plaque control efficacy of Persica™: A commercially available herbal mouthwash containing extracts of Salvadora persica. International Dental Journal, 54(5), 279-283.

Borgula, L. M., Robinson, F. G., Rahimi, M. A., Chew, K. E. K., Birchmeier, K. R., Owens, S. G., Kieser, J. A., & Tompkins, G. R. (2003). Isolation and genotypic comparison of oral streptococci from experimental bitemarks. Journal of Forensic Odonto-Stomatology, 21(2), 23-30.

Tompkins, G. R., O'Dell, N. L., Bryson, I. T., & Pennington, C. B. (2001). The effects of dietary ferric iron and iron deprivation on the bacterial composition of the mouse intestine. Current Microbiology, 43, 38-42.

Thomson, W. M., Edwards, S. J., Dobson-Le, D. P., Tompkins, G. R., Poulton, R., Knight, D. A., … Braithwaite, A. W. (2001). IL-1 genotype and adult periodontitis among young New Zealanders. Journal of Dental Research, 80, 1700-1703.

Calderone, R., Suzuki, S., Cannon, R., Cho, T., Boyd, D., Calera, J., … Holmes, A., Jeng, H.-W., … O'Sullivan, J. M., … Tompkins, G. R., & Watanabe, T. (2000). Candida albicans: Adherence, signalling and virulence. Medical Mycology, 38(Suppl. 1), 125-137.

Simmonds, R. S., Tompkins, G. R., & George, R. J. (2000). Dental caries and the microbial ecology of dental plaque: A review of recent advances. New Zealand Dental Journal, 96, 44-49.

Tompkins, G. R., Peavey, M. A. A., Birchmeier, K. R., & Tagg, J. R. (1997). Bacteriocin production and sensitivity among coaggregating and non-coaggregating oral streptococci. Oral Microbiology & Immunology, 12(2), 98-105.

Tompkins, G. R., Wood, D. P., & Birchmeier, K. R. (1997). Detection and comparison of specific hemin binding by Porphyromonas gingivalis and Prevotella intermedia. Journal of Bacteriology, 179(3), 620-626.

Knoernschild, K. L. L., Tompkins, G. R., Schuster, G. S., Lefebvre, C. A., & Russell, C. M. (1997). Effect of treatment concentration on lipopolysaccharide affinity for two alloys. Dental Materials, 13(2), 111-117.

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Journal - Research Other

Pardesi, B., & Tompkins, G. R. (2015). Colony polymerase chain reaction of heme-accumulating bacteria [Note]. Anaerobe, 32, 49-50. doi: 10.1016/j.anaerobe.2014.11.013

Cannon, R. D., & Tompkins, G. R. (2006). Improving the effectiveness of chlorhexidine. New Zealand Dental Journal, 102(1), 17.

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