This article has been peer reviewed October 2000 Vol 66 No 9Journal of the Canadian Dental AssociationComplete Denture Covering Mandibular Tori Using Three Base MaterialsInitially we had fabricated th ID: 864815
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1 Journal of the Canadian Dental Associati
Journal of the Canadian Dental AssociationOctober 2000, Vol. 66, No. 9he torus mandibularis is a bony prominence on thelingual surface, found usually within the firstmandibular cuspid to first molar area. Tori are This article has been peer reviewed. October 2000, Vol. 66, No. 9Journal of the Canadian Dental AssociationComplete Denture Covering Mandibular Tori Using Three Base MaterialsInitially we had fabricated the lingual ßanges in thermo-plastic material but found that it locked into the undercutcausing denture sores and pain on removal of the denture. Theadditional placement of a resilient liner solved these problemsFig. 4DiscussionThe thermoplastic material BITEM is relatively rigid atmouth temperature but tempers in hot water, softening thematerial. It is adjusted by Þrst chilling the denture and thenpolishing or grinding. Essentially, it is a methyl methacrylate,and therefore it bonds chemically to the denture base and theresilient liner. The result is a semi-rigid ßange that slides easilyover the mandibular tori.Resilient liners such as Molloplast are widely used as acushion on the Þtting surface of dentures in the managementof traumatized oral mucosa, bony undercuts, bruxism, ridgeatrophy and congenital oral defects requiring obturation.Soft lining materials provide an even distri
2 bution of the func-tional load and avoid
bution of the func-tional load and avoid local stress concentrations.There are2 main types Ñ plasticized acrylics and silicone elastomers Ñthe latter differing in the percentage of crosslinking agents, catalysts and Þllers and available in autopolymerizing andSilicone-based polymers remain soft orrubbery at or below mouth temperatures.Our patient found the new denture very retentive withoutsoreness over the mandibular tori. The resilient liner preventedthe thermoplastic ßanges from locking around the torus andlessened the occlusal load on the torus. The lingual aspect ofthe denture was slightly thicker than usual due to the positionof the torus and the need to stabilize the material. This initiallycaused some problems with speech, but the patient was able toadapt and has worn the denture for over one year with no need Acknowledgment:I acknowledge the help and advice of Mr. RonKlausz of Klausz Dental Laboratories, Toronto. My partner, Dr.Warren Hellen, has always provided a willing ear in treatmentDr. Abrams Dr. Stephen Abrams, 2995 Kingston Rd,Scarborough, ON M1M 1P1. E- mail: dr.abrams4cell@sympatico.ca. facturing the types of products mentioned in this article. Figure 1:Intraoral view of bilateral mandibular tori. Final model of the mandibular arch. Figure 3:Mandibular denture with lingual
3 ßange fabricated in BITEMmaterial. Tiss
ßange fabricated in BITEMmaterial. Tissue surface of the mandibular denture. Journal of the Canadian Dental AssociationOctober 2000, Vol. 66, No. 98. Bell DH Jr. Clinical evaluation of a resilient denture liner. J ProsthetDent9. Jagger, DC. Complete dentures Ñ the soft option. An update forBr Dent J1997; 182:313-7. Review.References1. Johnson OM. The tori and masticatory stress. J Prosthet Dent2. Seah YH. Torus palatinus and torus mandibularis: a review of theliterature. Aust Dent J1995; 40:318-21. Review.3. Shah DS, Sanghavi SJ, Chawda JD, Shah RM. Prevalence of toruspalatinus and torus mandibularis in 1000 patients. Indian J Dent Res4. Reichart PA, Neuhaus F, Sookasem M. Prevalence of torus palatinusand torus mandibularis in Germans and Thai. Community Dent OralEpidemiol5. Kerdpon D, Sirirungrojying S. A clinical study of oral tori in southernThailand: prevalence and the relation to parafunctional activity. Eur JOral Sci6. Baysan A, Parker S, Wright PS. Adhesion and tear energy of a long-term soft lining material activated by rapid microwave energy. J ProsthetDent7. Wright PS. The success and failure of denture soft-lining materials inJ Dent ESOURCE The Resource Centre has a 2-part video by Joseph J.Massad, Predictable complete denturesmembers can borrow. Please contact the Resource Centr