Comparative Evaluation of Processing Accuracy between Compression Molded and Injection Molded Complete Dentures- An In Vitro Study
Keywords:
Compression Molding, Injection Molding, Incisal, Pin Opening, Polymethyl Methacrylate(PMMA)
Abstract
Statement of Problem: A clinically significant incisal pin opening may occur after processing complete dentures if a compression molding technique is used. To obtain the proper vertical dimension of occlusion, a time-consuming occlusal adjustment is necessary that often destroys the anatomy of the artificial teeth. A new injection molding process claims to produce dentures that require few, if any, occlusal adjustments in the laboratory after processing.
Purpose: The purpose of this in-vitro study was to compare the dimensional accuracy by comparing the incisal pin opening of dentures fabricated by compression and injection molding techniques.
Material and Methods: Forty sets of complete maxillary and mandibular dentures were fabricated using two different molding techniques and grouped them as:- Group 1(control):- Twenty sets using compression molding technique and Group 2:- Twenty sets using an injection molding technique. Incisal pin opening was measured with a micrometer. Data were analysed statistically using an independent t-test.(p=0.00)
Results: A significant difference was found in pin opening between groups (t-test). However, analysis of vertical dimensional changes disclosed significant differences between the groups.
Conclusion: The injection molding method produced a significantly smaller incisal pin opening over the standard compression molding technique. The injection molding technique, using polymethyl methacrylate, was a more accurate method for processing dentures.
References
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22. Keenan PLJ, Radford DR, Clark RKF. Dimensional change in complete dentures fabricated by injection molding and microwave processing. J Prosthet Dent 2003;89: 37-44. doi: https://doi.org/10.1067/mpr.2003.3
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24. Pronych GJ, Sutow EJ, Sykora O. Dimensional stability and dehydration of a thermoplastic polycarbonate-based and two PMMA-based denture resins. J Oral Rehabil 2003;30:1157-61. doi: https://doi.org/10.1111/j.1365-2842.2003.01189.x
25. Anthony DH, Peyton FA. Dimensional accuracy of various denture-base materials. J Prosthet Dent 1962; 12:67-81.
26. Latta GH Jr, Bowles WF, Conkin JE. Three dimensional stability of new denture base resin systems. J Prosthet Dent 1990; 63:654-61. doi: https://doi.org/10.1016/0022-3913(90)90322-4
27. Huggett R, Zissis A, Harrison A, Dennis A Dimensional accuracy and stability of acrylic resin denture bases. J Prosthet Dent 1992;68: 634-40.doi: https://doi.org/10.1016/0022-3913(92)90379-o
28. Chen JC, Lacefield WR, Castleberry DJ. Effect of denture thickness and curing cycle on the dimensional stability of acrylic resin denture bases. Dent Mater 1988;4:20-4.doi: https://doi.org/10.1016/s0109-5641(88)80083-6
29. A Andreas, MSc, J S Andrzej, LCGI, R M Jose, Robert K. F. Clark and David R. Radford Three-dimensional processing deformation of three denture base materials Dec 2013 (J Prosthet Dent 2013;110:481-487). doi: https://doi.org/10.1016/j.prosdent.2013.07.005
30. Ganzarolli SM, de Mello JA, Shinkai RS, Del BelCury AA. Internal adaptation and some physical properties of methacrylate based denture based resin polymerized by different technique. J Biomed Mater Res B Appl Biomater2007; 82B;169-73. doi: https://doi.org/10.1002/jbm.b.30718
31. Woelfel JB, Paffenbarger GC. Dimensional changes occurring in artificial dentures. Int Dent J 1959;9:451-60, doi: https://doi.org/10.14219/jada.archive.1960.0205
32. Schmidt KH. SR Ivocap system and denture structure. Quintessence Int 1976; 7:29-32.
2. Pande NA, Shori K .Comparative Evaluation of Impact and Flexural Strength of Four Commercially Available Flexible Denture Base Materials: An in Vitro Study. J Indian ProsthodontSoc 2013; 13(4):499–508.doi: https://doi.org/10.1007%2Fs13191-012-0203-0
3. Parvizi A, Lindquist T, Schneider R, Williamson D, Boyer D, Dowsen V D comparison of dimensional accuracy of injection molded denture base material to that of conventional pressure pack acrylic resin, June 2004, Journal of prosthodontics vol 13 No 2,pp83-89, doi: https://doi.org/10.1111/j.1532-849x.2004.04014.x
4. Sergio S. Nogueira, Robert E. Ogle And Davis EL, Comparison of Accuracy Between Compression- And Injection-Molded Complete Dentures Sept. 1999 Volume 82 Number 3 (J Prosthet Dent 1999; 82:291-300.)doi: https://doi.org/10.1016/s0022-3913(99)70083-1
5. Ghazali E S, Glantz O P and Randow K On The Clinical Deformation Of Maxillary Complete Dentures Influence Of The Processing Techniques Of Acrylate-Based Polymers 23 May 2015. ActaOdontolScand1988; 46:287-295. Oslo. ISSN 0001-6357.Doi: https://doi.org/10.3109/00016358809004779
6. Lee CJ, BOK S B, Bae JY and Lee HH Comparative adaptation accuracy of acrylic denture bases evaluated by two different methods Dent Mater J 2010; 29(4): 411–417; doi: https://doi.org/10.4012/dmj.2009-105
7. Gharechahi J, Asadzadeh N, Shahabian F And GharechahiM Dimensional Changes Of Acrylic Resin Denture Bases: Conventional Versus Injection-Molding Technique 2014 Jul; 11(4): 398–405. J Dent (Tehran)https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4283740/
8. G Erika, D.D.S., M.S. Evaluation of dimensional changes in complete dentures processed by injection-pressing and the pack-and-press technique December 1983 Volume 50 Number G (The Journal Of Prosthetic Dentistry)
9. Rama Krishna Allah. Influence of fiber reinforcement on the properties of denture base resins. Journal of Biomaterials and Nano biotechnology, 2013; 4: 91-97.doi: http://dx.doi.org/10.4236/jbnb.2013.41012
10. Wesley RC, Henderson D, Frazier QZ, et al. Processing changes in complete dentures: posterior tooth contacts and pin opening. J PROSTHETDENT 1973; 29:46-53.
11. Woelfel JB. Processing complete dentures. Dent Clin North Am 1977; 21:329-38.https://pubmed.ncbi.nlm.nih.gov/321278/
12. Garfunkel E. Evaluation of dimensional changes in complete dentures processed by injection-pressing and the pack and-press technique. J Prosthet Dent 1983;50:757-61.Doi: https://doi.org/10.1016/0022-3913(83)90085-9
13. Strohaver RA. Comparison of changes in vertical dimension between compression and injection molded complete dentures. J Prosthet Dent 1989;62:716-8.doi: https://doi.org/10.1016/0022-3913(89)90599-4
14. Sykora O, Sutow EJ. Posterior palatal seal adaptation: influence of processing technique, palate shape and immersion. J Oral Rehabil 1993;20:19-31.doi: https://doi.org/10.1111/j.1365-2842.1993.tb01511.x
15. G C Anderson, J K Schulte, T G Arnold; J Prosthet Dent 1988; 60:394-8.GC, Schulte JK, Arnold TG. Dimensional stability of injection and conventional processing of denture base acrylic resin.doi: https://doi.org/10.1016/0022-3913(88)90292-2
16. Salim S, Sadamori S, Hamada T. The dimensional accuracy of rectangular acrylic resin specimens cured by three denture base processing methods. J Prosthet Dent 1992;67:879-81.doi: https://doi.org/10.1016/0022-3913(92)90606-b
17. Nelson MW, Kotwal KR, Sevedge SR. Changes in vertical dimension of occlusion in conventional and microwave processing of complete dentures. J Prosthet Dent 1991;65:306-8. doi: https://doi.org/10.1016/0022-3913(91)90180-5
18. Phillip L. J. Keenan, David R. Radford and Robert K. F. Clark Dimensional change in complete dentures fabricated by injection molding and microwave processing (J Prosthet Dent 2003;89:37-44.) doi: https://doi.org/10.1067/mpr.2003.3
19. J. Bryan McLaughlin, Van Ramos Jr. & Douglas P. Dickinson Comparison of Fit of Dentures Fabricated by Traditional Techniques Versus CAD/CAM Technology Journal of Prosthodontics 00 (2017) 1–8 C _ 2017 by the American College of Prosthodontists; doi: https://doi.org/10.1111/jopr.12604
20. Chintalacheruvu VK, Balraj RU, Putchala LS, Pachalla S. Evaluation of three different processing techniques in the fabrication of complete dentures. J Int Soc Prevent Communit Dent 2017;7, Suppl S1:18-23doi: https://doi.org/10.4103/jispcd.jispcd_102_17
21. Jody L. Clements, Daranee Tantbirojn, Antheunis Versluis, and David R. Cagna Do denture processing techniques affect the mechanical properties of denture teeth? (J Prosthet Dent 2018).
22. Keenan PLJ, Radford DR, Clark RKF. Dimensional change in complete dentures fabricated by injection molding and microwave processing. J Prosthet Dent 2003;89: 37-44. doi: https://doi.org/10.1067/mpr.2003.3
23. Pryor WJ. Injection moulding of plastics for dentures. J Am Dent Assoc 1942; 29:1400-8.
24. Pronych GJ, Sutow EJ, Sykora O. Dimensional stability and dehydration of a thermoplastic polycarbonate-based and two PMMA-based denture resins. J Oral Rehabil 2003;30:1157-61. doi: https://doi.org/10.1111/j.1365-2842.2003.01189.x
25. Anthony DH, Peyton FA. Dimensional accuracy of various denture-base materials. J Prosthet Dent 1962; 12:67-81.
26. Latta GH Jr, Bowles WF, Conkin JE. Three dimensional stability of new denture base resin systems. J Prosthet Dent 1990; 63:654-61. doi: https://doi.org/10.1016/0022-3913(90)90322-4
27. Huggett R, Zissis A, Harrison A, Dennis A Dimensional accuracy and stability of acrylic resin denture bases. J Prosthet Dent 1992;68: 634-40.doi: https://doi.org/10.1016/0022-3913(92)90379-o
28. Chen JC, Lacefield WR, Castleberry DJ. Effect of denture thickness and curing cycle on the dimensional stability of acrylic resin denture bases. Dent Mater 1988;4:20-4.doi: https://doi.org/10.1016/s0109-5641(88)80083-6
29. A Andreas, MSc, J S Andrzej, LCGI, R M Jose, Robert K. F. Clark and David R. Radford Three-dimensional processing deformation of three denture base materials Dec 2013 (J Prosthet Dent 2013;110:481-487). doi: https://doi.org/10.1016/j.prosdent.2013.07.005
30. Ganzarolli SM, de Mello JA, Shinkai RS, Del BelCury AA. Internal adaptation and some physical properties of methacrylate based denture based resin polymerized by different technique. J Biomed Mater Res B Appl Biomater2007; 82B;169-73. doi: https://doi.org/10.1002/jbm.b.30718
31. Woelfel JB, Paffenbarger GC. Dimensional changes occurring in artificial dentures. Int Dent J 1959;9:451-60, doi: https://doi.org/10.14219/jada.archive.1960.0205
32. Schmidt KH. SR Ivocap system and denture structure. Quintessence Int 1976; 7:29-32.
Published
2021-06-30
How to Cite
Mirza, A. H., Gupta, R., Kapoor, H., Ahmad, A., & Agnihotri, A. (2021). Comparative Evaluation of Processing Accuracy between Compression Molded and Injection Molded Complete Dentures- An In Vitro Study. International Journal Of Drug Research And Dental Science, 3(2), 142-152. Retrieved from https://ijdrd.com/index.php/ijdrd/article/view/134
Section
Original Article
