Volkan ŞAHİN, Hossein JODATİ, Zafer EVİS

Effect of Storage Time on Tear Strength of Extended-Pour Irreversible Hydrocolloid Impression Materials

Amaç: Bu in-vitro çalışmanın amacı; uzatılmış saklama sürelerinin, uzatılmış model elde etme süresine sahip irreversible hidrokolloid ölçü malzemelerinin yırtılma dayanımı üzerine etkisini incelemektir. Materyal-Metod: Beş ticari (BluePrint Xcreme, Hydrogum 5, Kromopan, Alginmax ve Alginelle) ve bir özel formüle edilmiş uzatılmış model etme süresine sahip irreversible hidrokolloid ölçü malzemesi kullanılarak ISO 21563:2013 standartlarına uyumlu seksen dört adet numune hazırlanmıştır. Her bir ölçü malzemesine sait numuneler rastgele iki gruba ayrılmış (n=7) ve hemen veya 120 saatlik saklama süresi sonunda yırtılma testine tabi tutulmuşlardır. Yırtılma dayanımı değerleri N/mm cinsinden ifade edilmiş ve veriler iki yönlü varyans analizi testi (irreversible hidrokolloid markası, saklama süresi) kullanılarak analiz edilmiştir. Çoklu karşılaştırmalara, Tukey testi kullanılarak yapılmıştır (p=0.05). Bulgular: Uzatılmış model etme süresine sahip irreversible hidrokolloid ölçü malzemelerinin yırtılma dayanımları, irreversible hidrokolloid markası parametresi (p<0.0001) ve irreversible hidrokolloid markası-saklama süresi etkileşimi tarafından etkilenmiştir (p=0.005). tarafından etkilenmiştir Saklama süresi, uzatılmış model etme süresine sahip irreversible hidrokolloid ölçü malzemelerinin yırtılma dayanımlarını, 120 saat saklama süresi sonunda yırtılma dayanımı artan Alginmax ölçü malzemesi haricinde etkilememiştir (p<0.05). Hemen yapılan yırtılma dayanımı testinde Blueprint Xcreme en yüksek ortalama yırtılma dayanımı değerlerine sahipken (1.08±0.19 N/mm) Alginelle en düşük ortalama yırtılma dayanımı değerlerini göstermiştir (0.51±0.3 N/mm). 120 saat saklama süresi sonunda Hydrogum 5 en yüksek ortalama yırtılma dayanımı değerlerine sahipken (1.15± 0.12 N/mm) Alginelle en düşük ortalama yırtılma dayanımı değerlerini göstermiştir (0.55±0.04 N/mm). Sonuç: Test edilen uzatılmış model elde etme süresine sahip ticari irreversible hidrokolloid ölçü malzemelerinin tümü, yırtılma dayanımlarını 120 saatlik saklama süresi sonunda korumuştur.

Anahtar Kelimeler:

Tear Strength, Irreversible Hydrocolloid, Impression Material

Effect of storage time on tear strength of extended-pour irreversible hydrocolloid impression materials

Objective: The aim of this in vitro study was to evaluate the effect of prolonged storage times on the tear strength of extended-pour irreversible hydrocolloid impression materials. Material and Method: Eighty four specimens were fabricated from five commercial extended-pour irreversible hydrocolloid impression materials (BluePrint Xcreme, Hydrogum 5, Kromopan, Alginmax and Alginelle) as well as one experimental formula in accordance with the ISO 21563:2013 standard effective for irreversible hydrocolloid impression materials. Specimens were randomly divided in two groups for each impression material (n=7) and subjected to tear strength test immediately (base line) or after 120 hours of storage. Tear strength values were obtained in N/mm and data were analysed with two-way ANOVA (irreversible hydrocolloid brand, storage time). Multiple comparisons were performed with Tukey’s test (p=0.05). Results: The tear strength of the extended-pour irreversible hydrocolloid impression materials were affected by brand (p<0.0001) and brand-storage time interaction (p=0.005). Storage time did not influence the tear strengths of the extended-pour irreversible hydrocolloid impression materials tested except Alginmax whose mean tear strengths increased after 120 hours of storage (p<0.05). At base line measurements Blueprint Xcreme provided the highest mean tear strength values (1.08±0.19 N/mm) whereas Alginelle provided the lowest mean tear strength values (0.51±0.3 N/mm). Hydrogum 5 provided the highest tear strength values after 120 hours of storage (1.15± 0.12 N/mm) whereas Alginelle provided the lowest mean tear strength values (0.55±0.04 N/mm). Conclusion. All commercial extended-pour irreversible hydrocolloid impression materials tested maintained their tear strengths after 120 hours of storage.

Keywords:

Tear strength, irreversible hydrocolloid, impression material,

PDF

___

1. Anusavice K, Shen, C, Rawls HR. Phillips’ science of dental materials. 12th ed. St. Louis: Saunders Elsevier; 2013. p. 151.
2. Nandini VV, Venkatesh KV, Nair KC. Alginate impressions: a practical perspective. J Conserv Dent 2008; 11: 37-41.
3. Phoenix RD, Rodney D. Stewart’s clinical removable partial prosthodontics. 3rd ed. Hanover: Quintessence; 2002. p. 1627.
4. Kaur G, Jain P, Uppal M, Sikka R. Alginate impression materials: from then till now. Heal Talk J Clin Dent 2012; 5:38-9.
5. Craig RG, Robert G. Restorative dental materials. 11th ed. St. Louis: Mosby; 2002. p. 12.
6. Lee EA. Impression material selection in contemporary fixed prosthodontics: technique, rationale, and indications. Compend Contin Educ Dent 2005; 26: 780-9.
7. Ciapetti G, Granchi D, Stea S, et al. Cytotoxicity testing of materials with limited in vivo exposure is affected by the duration of cell-material contact. J Biomed Mater Res 1998; 42: 485–90.
8. Vrijhoef MMA, Battistuzzi, PG. Tear energy of impression materials. J Dent 1986; 175-7.
9. Lawson NC, Burgess JO, Litaker M. Tear strength of five elastomeric impression materials at two setting times and two tearing rates. J Esthet Restor Dent 2008; 20: 186-94.
10. Marshak BL, Cardash HS, Ben-Ur Z. Incidence of impression material found in the gingival sulcus after impression procedure for fixed partial dentures. J Prosthet Dent 1987; 57: 306-8.
11. Donovan JE, Chee WW. A review of contemporary impression materials and techniques. Dent Clin North Am 2004; 48: 445-70.
12. Miller MW. Syneresis in alginate impression materials. Br Dent J 1975; 139: 425-30.
13. Jamani KD. The effect of pouring time and storage condition on the accuracy of irreversible hydrocolloid impressions. Saudi Dent J 2002; 14: 126-30.
14. Walker MP, Burckhard J, Mitts DA, Williams KB. Dimensional change over time of extended-storage alginate impression materials. Angle Orthod 2010; 80: 1110-5.
15. Chai J, Takahashi Y, Lautenschlager E. P. Clinically relevant mechanical properties of elastomeric impression materials. Int J Prosthodont 1998; 11: 219–23.
16. Lu H, Nguyen B, Powers J. Mechanical properties of 3 hydrophilic addition silicone and polyether elastomeric impression materials. J Prosthet Dent 2004; 92: 151–54.
17. Webber RL, Ryge G. The determination of tear energy of extensible materials of dental interest. J. Biomed Mater Res 1968; 2: 281–96.
18. Huynh L, Xie DX, Shellard E. Mechanical properties of polysulfide impression materials. J Dent Res 2002; 81: 2667.
19. Whiteman Y, Nathanson D. Tear strength and dimensional accuracy of elastomeric impression materials, J Dent Res 2007; 86: 184.
20. Dentistry, Hydrocolloid impression materials, ISO 21563 2014-02
21. Boghosian A, Lautenschlager EP. Tear strength of low-viscosity elastomeric impression materials. J Dent Res 2003; 82:137.