Comparison of temperature rise in pulp chamber during polymerization of materials used for direct fabrication of provisional restorations: An in-vitro study

ABSTRACT

Objective: The purpose is to compare temperature rise in the pulp chamber during fabrication of provisional crowns using different materials and on different types of teeth using direct technique. Materials and Methods: An extracted, sound, caries free maxillary central incisor and a mandibular molar were selected for the study and crown preparations of all ceramic and all metal were done on central incisor and mandibular molar, respectively. Materials tested were DPI tooth molding self-curing material and protemp-4. Addition silicone putty was used as a matrix and 80 provisional crowns were fabricated, of which 40 were on central incisor and 40 on mandibular molar. Depending on the type of material used, they were further divided into two subgroups: Each comprising 20 provisional crowns. Temperature readings were recorded using K type of thermocouple with 0.1°C precision digital thermometer. Statistical Analysis Used: Analysis of variance, Tukey honest significant difference and Kruskall–Wallis H-test. Results: Statistically significant difference exists between two materials tested on the basis of peak temperature achieved and time taken by a particular material to reach peak temperature. Peak temperature achieved was highest for provisional crowns with DPI tooth molding self-curing material on maxillary central incisor (40.39 + 0.46), followed by DPI tooth molding self-curing material on mandibular molar (40.03 + 0.32), protemp-4 on maxillary central incisor (39.46 + 0.26) and least with protemp-4 on mandibular molar (39.09 + 0.33). The time taken to reach peak temperature was almost double in DPI tooth molding self-curing material (5 min) than in protemp-4. Conclusion: Polymethyl methacrylate resin produced higher intra-pulpal rise when compared to newer generation bis-acrylic composite.

Key words:

Bis-acrylic composite resin - exothermic heat - polymethyl methacrylate resin - provisional restorations

• REFERENCES

• 1 Richards D. Oral diseases affect some 3.9 billion people. Evid Based Dent 2013; 14: 35
• 2 Robinson HB, Lefkowitz W. Operative dentistry and pulp. J Prosthet Dent 1962; 12: 985-1001
• 3 Skurow HM, Nevins M. The rationale of the preperiodontal provisional biologic trial restoration. Int J Periodontics Restorative Dent 1988; 8: 8-29
• 4 Ivkonic N, Bozovic D, Ristic S, Mirjanic V, Jankovic O. The residual monomer in dental acrylic resin and its adverse effects. Contemp Mater 2013; 4: 85-91
• 5 Wiltshire WA, Ferreira MR, Ligthelm AJ. Allergies to dental materials. Quintessence Int 1996; 27: 513-20
• 6 Zach L, Cohen G. Pulp response to externally applied heat. Oral Surg Oral Med Oral Pathol 1965; 19: 515-30
• 7 Driscoll CF, Woolsey G, Ferguson WM. Comparison of exothermic release during polymerization of four materials used to fabricate interim restorations. J Prosthet Dent 1991; 65: 504-6
• 8 Rawls HP. Dental polymers. In: Anusavice KJ. editor. Phillips Science of Dental Materials. 11th ed.. St. Louis: Elsevier; 2003: 143-66
• 9 Ferracane JL, Greener EH. Fourier transform infrared analysis of degree of polymerization in unfilled resins – methods comparison. J Dent Res 1984; 63: 1093-5
• 10 Stansbury JW, Dickens SH. Determination of double bond conversion in dental resins by near infrared spectroscopy. Dent Mater 2001; 17: 71-9
• 11 Daronch M, Rueggeberg FA, Hall G, De Goes MF. Effect of composite temperature on in vitro intrapulpal temperature rise. Dent Mater 2007; 23: 1283-8
• 12 Oztürk B, Usümez A, Oztürk AN, Ozer F. In vitro assessment of temperature change in the pulp chamber during cavity preparation. J Prosthet Dent 2004; 91: 436-40
• 13 Xie C, Wang Z, He H, Han Y. In vitro pulp chamber temperature rise during fabrication of provisional restorations on different types of teeth. Int Chin J Dent 2007; 7: 69-74
• 14 Vallittu PK. Peak temperatures of some prosthetic acrylates on polymerization. J Oral Rehabil 1996; 23: 776-81
• 15 Moulding MB, Teplitsky PE. Intrapulpal temperature during direct fabrication of provisional restorations. Int J Prosthodont 1990; 3: 299-304
• 16 Michalakis K, Pissiotis A, Hirayama H, Kang K, Kafantaris N. Comparison of temperature increase in the pulp chamber during the polymerization of materials used for the direct fabrication of provisional restorations. J Prosthet Dent 2006; 96: 418-23
• 17 Trowbridge HO, Franks M, Korostoff E, Emling R. Sensory response to thermal stimulation in human teeth. J Endod 1980; 6: 405-12
• 18 Tjan AH, Grant BE, Godfrey 3^rd MF. Temperature rise in the pulp chamber during fabrication of provisional crowns. J Prosthet Dent 1989; 62: 622-6
• 19 Chiodera G, Gastaldi G, Millar BJ. Temperature change in pulp cavity in vitro during the polymerization of provisional resins. Dent Mater 2009; 25: 321-5
• 20 Akova T, Ozkomur A, Dundar C, Aytutuldu N. Intrapulpal heat generation during provisionalization: Eeffect of desensitizer and matrix type. J Prosthodont 2008; 17: 108-13
• 21 Usumez A, Ozturk AN, Aykent F. The effect of dentin desensitizers on thermal changes in the pulp chamber during fabrication of provisional restorations. J Oral Rehabil 2004; 31: 579-84
• 22 Kim SH, Watts DC. Exotherm behavior of the polymer-based provisional crown and fixed partial denture materials. Dent Mater 2004; 20: 383-7
• 23 Yondem I, Altintas SH, Usumez A. Temperature Rise during Resin Composite Polymerization under Different Ceramic Restorations. Eur J Dent 2011; 5: 305-9
• 24 Malcic AI, Pavicic I, Trošic I, Simeon P, Katanec D, Krmek SJ. The effects of bluephase LED light on fibroblasts. Eur J Dent 2012; 6: 311-7