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Sir John Walsh Research Institute researcher profile

Associate Professor Rohana De Silva (Kumara)

PositionAssociate Professor
DepartmentDepartment of Oral Diagnostic and Surgical Sciences
QualificationsBDS (S Lanka) FDSRCPSGlas FFDRCSI FDSRCS
Research summaryDental implants and post-operative pain management

Research

Associate Professor Kumara De Silva has special interest in exploring the avenues to find ways of rehabilitating partial and complete edentulous patients with economical use of dental implants.The focus is to look for ways of rehabilitating patients in the shortest possible time following dental extractions using the minimum number of implant fixtures. His research expands further into analysing the quality of life of individuals treated with dental implants and to find the feasibility of using metal-free implant fixtures.This area of research was accepted as an area of research strength by the University of Otago.

He also conducts research also conducts research in the management of post- operative pain after surgical removal of wisdom teeth and to evaluate the metabolism of commonly used analgesics in the body. Several double-blinded crossover trials were conducted to compare different analgesics commonly used in the management of post-operative pain after surgical removal of wisdom teeth. In addition, he has designed a new flap technique for removal of wisdom teeth to minimise post-operative complications.

Publications

Kallarakkal, T. G., Siriwardena, B. S. M. S., Samaranayaka, A., De Silva, R., & Tilakaratne, W. M. (2022). A validated predictive model for risk of nodal metastasis in node negative oral squamous cell carcinoma of the buccal mucosa and tongue. Journal of Oral Pathology & Medicine. Advance online publication. doi: 10.1111/jop.13294

Naung, N. Y., Duncan, W. J., De Silva, R. K., & Coates, D. E. (2021). HGF/MET in osteogenic differentiation of primary human palatal periosteum-derived mesenchymal stem cells. Journal of Oral Science. Advance online publication. doi: 10.2334/josnusd.21-0164

Won, J., De Silva, H. L., De Silva, R. K., & Colambage, S. (2020). An unusual lingual lesion: Actinomycosis of the tongue. Oral Surgery, 13(1), 33-36. doi: 10.1111/ors.12437

Won, J., De Silva, H. L., & De Silva, R. K. (2020). A diagnostic dilemma: An unusually large osteochondroma of the mandibular condyle and temporo-mandibular dysfunction. Oral Surgery, 13, 164-167. doi: 10.1111/ors.12471

Tilakaratne, W. M., Jayasooriya, P. R., Jayasuriya, N. S., & De Silva, R. K. (2019). Oral epithelial dysplasia: Causes, quantification, prognosis, and management challenges. Periodontology 2000, 80(1), 126-147. doi: 10.1111/prd.12259

Payne, A. G. T., Tawse-Smith, A., De Silva, R. K., & Duncan, W. J. (2010). Early and conventional loading: Early loading of two implants in the mandible and final restoration with a retentive-anchor-supported RDP. In D. Wismeijer, D. Buser & U. Belser (Eds.), ITI treatment guide: Loading protocols in implant dentistry: Edentulous patients (Vol. 4). (pp. 76-84). Berlin, Germany: Quintessence.

Chapter in Book - Research

Kallarakkal, T. G., Siriwardena, B. S. M. S., Samaranayaka, A., De Silva, R., & Tilakaratne, W. M. (2022). A validated predictive model for risk of nodal metastasis in node negative oral squamous cell carcinoma of the buccal mucosa and tongue. Journal of Oral Pathology & Medicine. Advance online publication. doi: 10.1111/jop.13294

Journal - Research Article

Naung, N. Y., Duncan, W. J., De Silva, R. K., & Coates, D. E. (2021). HGF/MET in osteogenic differentiation of primary human palatal periosteum-derived mesenchymal stem cells. Journal of Oral Science. Advance online publication. doi: 10.2334/josnusd.21-0164

Journal - Research Article

Naung, N. Y., Duncan, W., De Silva, R., & Coates, D. (2019). Localization and characterization of human palatal periosteum stem cells in serum-free, xeno-free medium for clinical use. European Journal of Oral Sciences, 127, 99-111. doi: 10.1111/eos.12603

Journal - Research Article

Tilakaratne, W. M., Jayasooriya, P. R., Jayasuriya, N. S., & De Silva, R. K. (2019). Oral epithelial dysplasia: Causes, quantification, prognosis, and management challenges. Periodontology 2000, 80(1), 126-147. doi: 10.1111/prd.12259

Journal - Research Article

De Silva, R. K., Siriwardena, B. S. M. S., Samaranayaka, A., Abeyasinghe, W. A. M. U. L., & Tilakaratne, W. M. (2018). A model to predict nodal metastasis in patients with oral squamous cell carcinoma. PLoS ONE, 13(8), e0201755. doi: 10.1371/journal.pone.0201755

Journal - Research Article

Best, A. D., De Silva, R. K., Thomson, W. M., Tong, D. C., Cameron, C. M., & De Silva, H. L. (2017). Efficacy of codeine when added to paracetamol (acetaminophen) and ibuprofen for relief of postoperative pain after surgical removal of impacted third molars: A double-blinded randomised control trial. Journal of Oral & Maxillofacial Surgery, 75(10), 2063-2069. doi: 10.1016/j.joms.2017.04.045

Journal - Research Article

Payne, A. G. T., Tawse-Smith, A., Wismeijer, D., De Silva, R. K., & Ma, S. (2017). Multicentre prospective evaluation of implant-assisted mandibular removable partial dentures: Surgical and prosthodontic outcomes. Clinical Oral Implants Research, 28(1), 116-125. doi: 10.1111/clr.12769

Journal - Research Article

Samaranayaka, C., Samaranayaka, A., Barson, D., & De Silva, R. K. (2017). Factors influencing trends in trauma-associated orbital cavity reconstruction procedures and time delay: New Zealand national data 2000–2014. Trauma, 20(4), 258-267. doi: 10.1177/1460408617719477

Journal - Research Article

Ma, S., Tawse-Smith, A., De Silva, R. K., Atieh, M. A., Alsabeeha, N. H. M., & Payne, A. G. T. (2016). Maxillary three-implant overdentures opposing mandibular two-implant overdentures: 10-year surgical outcomes of a randomized controlled trial. Clinical Implant Dentistry & Related Research, 18(3), 527-544. doi: 10.1111/cid.12325

Journal - Research Article

Siddiqi, A., Duncan, W. J., De Silva, R. K., & Zafar, S. (2016). One-piece zirconia ceramic versus titanium implants in the jaw and femur of a sheep model: A pilot study. BioMed Research International, 2016, 6792972. doi: 10.1155/2016/6792972

Journal - Research Article

Dias, G. J., de Silva, R. K., Shah, T., Sim, E., Song, N., Colombage, S., & Cornwall, J. (2015). Multivariate assessment of site of lingual nerve. British Journal of Oral & Maxillofacial Surgery, 53(4), 347-351. doi: 10.1016/j.bjoms.2015.01.011

Journal - Research Article

Friedlander, L. T., Hussaini, H., Cullinan, M. P., Seymour, G. J., De Silva, R. K., De Silva, H., Cameron, C., & Rich, A. M. (2015). VEGF and VEGFR2 in dentigerous cysts associated with impacted third molars. Pathology, 47(5), 446-451. doi: 10.1097/pat.0000000000000272

Journal - Research Article

Siddiqi, A., Kieser, J. A., De Silva, R. K., Thomson, W. M., & Duncan, W. J. (2015). Soft and hard tissue response to zirconia versus titanium one-piece implants placed in alveolar and palatal sites: A randomized control trial. Clinical Implant Dentistry & Related Research, 17(3), 483-496. doi: 10.1111/cid.12159

Journal - Research Article

Atieh, M. A., Alsabeeha, N. H. M., Payne, A. G. T., de Silva, R. K., Schwass, D. R., & Duncan, W. J. (2014). The prognostic accuracy of resonance frequency analysis in predicting failure risk of immediately restored implants. Clinical Oral Implants Research, 25(1), 29-35. doi: 10.1111/clr.12057

Journal - Research Article

Siddiqi, A., Kieser, J. A., De Silva, R. K., McNaughton, A., & Duncan, W. J. (2014). Could the median-palate accommodate wide-bodied implants in order to support maxillary over-dentures? A radiomorphometric study of human cadavers. Clinical Oral Implants Research, 25(1), 101-109. doi: 10.1111/clr.12050

Journal - Research Article

Atieh, M. A., Alsabeeha, N. H. M., Duncan, W. J., de Silva, R. K., Cullinan, M. P., Schwass, D., & Payne, A. G. T. (2013). Immediate single implant restorations in mandibular molar extraction sockets: A controlled clinical trial. Clinical Oral Implants Research, 24(5), 484-496. doi: 10.1111/j.1600-0501.2011.02415.x

Journal - Research Article

Choi, H. J., De Silva, R. K., Tong, D. C., De Silva, H. L., Love, R. M., & Athens, J. (2013). The thickness of parietal bones in a New Zealand sample of cadaveric skulls in relation to calvarial bone graft. Craniomaxillofacial Trauma & Reconstruction, 6(2), 115-120. doi: 10.1055/s-0033-1343788

Journal - Research Article

Ng, D., De Silva, R. K., Smit, R., De Silva, H., & Farella, M. (2013). Facial attractiveness of skeletal Class II patients before and after mandibular advancement surgery as perceived by people with different backgrounds. European Journal of Orthodontics, 35(4), 515-520. doi: 10.1093/ejo/cjs028

Journal - Research Article

Siddiqi, A., Kieser, J. A., De Silva, R. K., McNaughton, A., Zafar, S., & Duncan, W. J. (2013). Trabecular bone microarchitecture in the median palate and maxillary premolar alveolar sites of edentulous elderly cadavers. Journal of Oral & Maxillofacial Surgery, 71(11), 1852.e1-1852.e11. doi: 10.1016/j.joms.2013.07.019

Journal - Research Article

Goldsmith, S. M., De Silva, R. K., Tong, D. C., & Love, R. M. (2012). Influence of a pedicle flap design on acute postoperative sequelae after lower third molar removal. International Journal of Oral & Maxillofacial Surgery, 41(3), 371-375. doi: 10.1016/j.ijom.2011.08.006

Journal - Research Article

Alsabeeha, N. H. M., Payne, A. G. T., De Silva, R. K., & Thomson, W. M. (2011). Mandibular single-implant overdentures: Preliminary results of a randomised-control trial on early loading with different implant diameters and attachment systems. Clinical Oral Implants Research, 22(3), 330-337. doi: 10.1111/j.1600-0501.2010.02004.x

Journal - Research Article

Campbell, D. I., De Silva, R. K., De Silva, H., Sinon, S. H., & Rich, A. M. (2011). Temporomandibular joint synovial chondromatosis with intracranial extension: A review and observations of patient observed for 4 years. Journal of Oral & Maxillofacial Surgery, 69(8), 2247-2252. doi: 10.1016/j.joms.2010.10.042

Journal - Research Article

Jattan, R., De Silva, H. L., De Silva, R. K., Rich, A. M., & Love, R. M. (2011). A case series of odontogenic keratocysts from a New Zealand population over a 20-year period. New Zealand Dental Journal, 107(4), 112-116.

Journal - Research Article

Parton, A. L., Tong, D. C., De Silva, H. L., Farella, M., & De Silva, R. K. (2011). A nine-year review of orthognathic surgery at the University of Otago. New Zealand Dental Journal, 107(4), 117-120.

Journal - Research Article

Siddiqi, A., Payne, A. G. T., De Silva, R. K., & Duncan, W. J. (2011). Titanium allergy: Could it affect dental implant integration? Clinical Oral Implants Research, 22(7), 673-680. doi: 10.1111/j.1600-0501.2010.02081.x

Journal - Research Article

Alsabeeha, N. H. M., De Silva, R. K., Thomson, W. M., & Payne, A. G. T. (2010). Primary stability measurements of single implants in the midline of the edentulous mandible for overdentures. Clinical Oral Implants Research, 21, 563-566. doi: 10.1111/j.1600-0501.2009.01890.x

Journal - Research Article

Atieh, M. A., Payne, A. G. T., Duncan, W. J., de Silva, R. K., & Cullinan, M. P. (2010). Immediate placement or immediate restoration/loading of single implants for molar tooth replacement: A systematic review and meta-analysis. International Journal of Oral & Maxillofacial Implants, 25, 401-415.

Journal - Research Article

Campbell, D. I., Kuzmanovic, D., & DeSilva, R. K. (2010). Bimaxillary osteotomy in a young, edentulous patient with LADD syndrome. Journal of Oral & Maxillofacial Surgery, 68(7), 1685-1690. doi: 10.1016/j.joms.2009.07.095

Journal - Research Article

Tong, D. C., Kumar, R. R., Kok, S., De Silva, R. K., & Thomson, W. M. (2010). Patterns of maxillofacial fracture presentation in Dunedin from 2000 to 2005. New Zealand Dental Journal, 106(1), 16-19.

Journal - Research Article

Alsabeeha, N., Payne, A. G. T., De Silva, R. K., & Swain, M. V. (2009). Mandibular single-implant overdentures: A review with surgical and prosthodontic perspectives of a novel approach. Clinical Oral Implants Research, 20(4), 356-365. doi: 10.1111/j.1600-0501.2008.01666.x

Journal - Research Article

Reith, D., Medlicott, N. J., De Silva, R. K., Yang, L., Hickling, J., & Zacharias, M. (2009). Simultaneous modelling of the Michaelis-Menten kinetics of paracetamol sulphation and glucuronidation. Clinical & Experimental Pharmacology & Physiology, 36(1), 35-42. doi: 10.1111/j.1440-1681.2008.05029.x

Journal - Research Article

Hall, J. A. G., Payne, A. G. T., Purton, D. G., Torr, B., Duncan, W. J., & De Silva, R. K. (2007). Immediately restored, single-tapered implants in the anterior maxilla: Prosthodontic and aesthetic outcomes after 1 year. Clinical Implant Dentistry & Related Research, 9(1), 34-45. doi: 10.1111/j.1708-8208.2007.00029.x

Journal - Research Article

Zacharias, M., De Silva, R. K., Hickling, J., Medlicott, N. J., & Reith, D. M. (2007). Comparative safety and efficacy of two high dose regimens of oral paracetamol in healthy adults undergoing third molar surgery under local anaesthesia. Anaesthesia & Intensive Care, 35(4), 544-549.

Journal - Research Article

Lou, S. M.-Y., Rich, A. M., De Silva, R. K., & Ferguson, M. M. (2006). Pleomorphic adenoma of a molar salivary gland. Oral Oncology EXTRA, 42, 170-172.

Journal - Research Article

Payne, A. G. T., Tawse-Smith, A., Thomson, W. M., Duncan, W., & Kumara, R. (2004). One-stage surgery and early loading of three implants for maxillary overdentures: A 1-year report. Clinical Implant Dentistry & Related Research, 6(2), 61-74.

Journal - Research Article

Zacharias, M., De Silva, R. K., Herbison, P., & Templer, P. (2004). A randomized crossover trial of tenoxicam compared with rofecoxib for postoperative dental pain control. Anaesthesia & Intensive Care, 32(6), 770-774.

Journal - Research Article

Payne, A. G. T., Tawse-Smith, A., Thomson, W. M., & Kumara, R. (2003). Early functional loading of unsplinted roughened surface implants with mandibular overdentures 2 weeks after surgery. Clinical Implant Dentistry & Related Research, 5(3), 143-153. doi: 10.1111/j.1708-8208.2003.tb00196.x

Journal - Research Article

Colquhoun, A. N., Cathro, I., Kumara, R., Ferguson, M. M., & Doyle, T. C. A. (2002). Bilateral coronoid hyperplasia in two brothers. Dentomaxillofacial Radiology, 31, 142-146.

Journal - Research Article

Fawcett, J. P., Kennedy, J., Kumar, A., Ledger, R., Kumara, R., Patel, M., & Zacharias, M. (2002). Comparative efficacy and pharmocokinetics of racemic bupivacaine and S-bupivacaine in third molar surgery. Journal of Pharmacy & Pharmaceutical Sciences, 5(2), 199-204.

Journal - Research Article

Kumara, R., & Zacharias, M. (2002). Effectiveness of tramadol as an analgesic in oral surgery. New Zealand Dental Journal, 98(431), 9-11.

Journal - Research Article

Payne, A. G. T., Tawse-Smith, A. A., Duncan, W. J., & Kumara, R. (2002). Conventional and early loading of unsplinted ITI implants supporting mandibular overdentures. Clinical Oral Implants Research, 13, 603-609.

Journal - Research Article

Tawse-Smith, A. A., Payne, A. G. T., Kumara, R., & Thomson, W. M. (2002). Early loading on unsplinted implants supporting mandibular overdentures using a one-stage operative procedure with two different implant systems: A 2-year report. Clinical Implant Dentistry & Related Research, 4, 33-42.

Journal - Research Article

Liston, P. N., Kumara, R., & Tong, D. C. (2001). Displaced polishing discs: two case reports and a review of the literature. British Dental Journal, 191, 74-76.

Journal - Research Article

Liston, P. N., Kumara, R., & Tong, D. C. (2001). Displaced polishing discs: Two case reports. British Dental Journal, 191(2), 74-76. doi: 10.1038/sj.bdj.4801099

Journal - Research Article

Payne, A. G. T., Tawse-Smith, A. A., Kumara, R., & Thomson, W. M. (2001). One-year prospective evaluation of the early loading of unsplinted conical Brånemark fixtures with mandibular overdentures immediately following surgery. Clinical Implant Dentistry & Related Research, 3, 9-19.

Journal - Research Article

Tawse-Smith, A. A., Payne, A. G. T., Kumara, R., & Thomson, W. M. (2001). One-stage operative procedure using two differing implant systems: A prospective study on implant overdentures in the edentulous mandible. Clinical Implant Dentistry & Related Research, 3, 185-193.

Journal - Research Article

Kumara, R., & Zacharias, M. (1998). Comparison of oral and intravenous routes of giving tenoxicam. New Zealand Dental Journal, 94(416), 50-53.

Journal - Research Article

Won, J., De Silva, H. L., & De Silva, R. K. (2020). A diagnostic dilemma: An unusually large osteochondroma of the mandibular condyle and temporo-mandibular dysfunction. Oral Surgery, 13, 164-167. doi: 10.1111/ors.12471

Journal - Research Other

Won, J., De Silva, H. L., De Silva, R. K., & Colambage, S. (2020). An unusual lingual lesion: Actinomycosis of the tongue. Oral Surgery, 13(1), 33-36. doi: 10.1111/ors.12437

Journal - Research Other

Goldsmith, S. M., Seo, B. L., de Silva, R. K., Parachuru, P., Rich, A. M., & Seymour, G. J. (2014). Oral mycosis fungoides: Report with immune profile. Oral Surgery, Oral Medicine, Oral Pathology & Oral Radiology, 118(2), e48-e52. doi: 10.1016/j.oooo.2013.10.005

Journal - Research Other

Osman, R. B., Ma, S., Duncan, W., De Silva, R. K., Siddiqi, A., & Swain, M. V. (2013). Fractured zirconia implants and related implant designs: Scanning electron microscopy analysis. Clinical Oral Implants Research, 24(5), 592-597. doi: 10.1111/j.1600-0501.2011.02411.x

Journal - Research Other

Goldblatt, F., Highton, J., & Kumara, R. G. M. S. C. (2004). Temporomandibular joint pseudogout: An uncommon site for a familiar condition. Annals of the Rheumatic Diseases, 63, 1706-1707. doi: 10.1136/ard.2003.019075

Journal - Research Other

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