Citation Information :
Chaturvedi S, Abdelmonem AM, Haralur S, Suleman G, Majeed MI, Alfarsi MA. An In Vivo Study to Compare Location of Neutral Zone Recorded with Two Materials. J Contemp Dent Pract 2019; 20 (2):239-246.
Aim: To establish a relationship between the crest of the alveolar ridge and neutral zone and to compare its location recorded by two different material.
Methods and materials: Thirty subjects were selected, and the location of the neutral zone was compared with the mandibular alveolar ridge crest. For each subject neutral zone was recorded by two different recording materials-Low fusing impression compound and tissue conditioner. After neutral zone recording, the relation between mandibular ridge crest and neutral zone location examined radiographically. The data so collected were checked for normality, descriptive statistics and the Mann-Whitney U test was used.
Results: Position of neutral zone was found towards lingual in the posterior, labial side in anterior and almost near to the alveolar ridge crest in premolar region. The thermoplastic flow of the material effects the position of neutral zone but no significant difference was noted in the positions of neutral zone recorded by the two materials in relation to the alveolar ridge crest.
Conclusion: Location of the neutral zone is not affected by the material used in recording it.
Clinical significance: The location of the neutral zone varies from subject to subject and mainly depends upon their musculature and can be recorded accurately by using correct technique irrespective of the materials used.
Beressin VE, Schiesser FJ. The neutral zone in complete and partial dentures, 2nd ed. St. Louis, USA:CV Mosby Co.; 1978. p. 73-89.
Bhorgonde D., Nandakumar K., Khurana P., et al. An evaluation of the position of the neutral zone in relation to the crest of mandibular alveolar ridge - An In-vivo study. J Int Oral Health. 2014 Apr; 6(2):45-54.
Zarb GA, Hobkirk J, Eckert S, Jacob R. Prosthodontic treatment for edentulous patients, 8th ed. St. Louis; CV Mosby Co.; 1975. p. 436-443.
Khamis M, Razek A, Abdalla F. Two-dimensional study of the neutral zone at different occlusal vertical heights. J Prosthet Dent 1981;46(5):484-489.
Starcke EN Jr. The contours of polished surfaces of complete dentures: A review of the literature. J Am Dent Assoc 1970;81(1):155-160.
Russell AF. The reciprocal lower complete denture. J Prosthet Dent 1959;9:180-190.
Roberts AL. The effects of outline and form upon denture stability and retention. Dent Clin North Am 1960;4:293-303.
Makzoumé JE. Morphologic comparison of two neutral zone impression techniques: A pilot study. J Prosthet Dent 2004;92(6):563-568.
Beresin VE, Schiesser FJ. The neutral zone in complete dentures
J Prosthet Dent 2006;95(2):93-100.
Beressin VE, Schiesser FJ. Neutral zone in complete denture. J Prosthet Dent 1976;36:356-367.
Cagna DR, Massad JJ, Schiesser FJ. The neutral zone revisited: from historical concepts to modern application. J Prosthet Dent 2009;101:405-412.
Fahmy FM, Kharat DU. A study of the importance of the neutral zone in complete dentures. J Prosthet Dent 1990;64:459-462.
Fahmi FM. The position of the neutral zone in relation to the alveolar ridge. J Prosthet Dent 1992;67:805-809.
Alfano SG, Leupold RJ. Using the neutral zone to obtain maxillomandibular relationship records for complete denture patients. J Prosthet Dent 2001;85:621e3.
Wee AG, Cwynar RB, Cheng AC. Utilization of the neutral zone technique for a maxillofacial patient. J Prosthodont 2000;9:2-7.
Gahan MJ, Walmsley AD. The neutral zone impression revisited. Br Dent J 2005;198:269-272.
Matthews E. The polished surfaces. Br Dent J 1961;111:407-411.
Raybin NH. The polished surface of complete dentures. J Prosthet Dent 1963;13:236e9.
McCord JF, Grant AA. Impression making. Br Dent J 2000;188:484-492.
Khamis M, Razek A, Abdalla F. Two-dimensional study of the neutral zone at different occlusal vertical heights. J Prosthet Dent 1981;46:484-489.
Ohkubo C, Hanatani S, Hosoi T, Mizuno Y. Neutral zone approach for denture fabrication for a partial glossectomy patient: a clinical report. J Prosthet Dent 2000;84:390-393.
Lynch CD, Allen PF. Overcoming the unstable mandibular complete denture: the neutral zone impression technique. Dent Update 2006;33:21e2. 24-26.
Barrenas L, Odman P. Myodynamic and conventional construction of complete dentures: a comparative study of comfort and function. J Oral Rehabil 1989;16:457-465.
Lott F, Levin B. Flange technique: an anatomic and physiologic approach to increased retention, function, comfort, and appearance of dentures. J Prosthet Dent 1966;16:394-413.
Wright SM. The polished surface contour: a new approach. Int J Prosthodont 1991;4:159-163.
Yi-Lin Yeh, Yu-Hwa Pan, Ya-Yi Chen. Neutral zone approach to denture fabrication for a severe mandibular ridge resorption patient: Systematic review and modern technique. Journal of Dental Sciences 2013;8:432-438.
Jitendra J Mete, Santosh Y Dixit, Sumit J Deshpande, Harshad Wagaj, Pravin Gaikwad. A Clinico-radiographic Evaluation of Relation between Neutral Zone and Crest of Mandibular Residual Alveolar Ridge with Different Duration of Edentulousness. J Int Oral Health 2016;8(9):916-921.
Karlsson S, Hedegard B. A study of the reproducibility of the functional denture space with a dynamic impression technique. J Prosthet Dent 1979;41:21-25.
Anusavice, K.J., Kenneth, J. Phillips' science of dental materials. 11th edition. Elsevier; 2003 p. 121-540.
Devlin, H. in: Complete dentures: a clinical manual for the general dental practitioner. Springer-Verlag, New York; 2002:55-56.
Cagna RD, Massad JJ, Schiesser FJ The neutral zone revisited: From historical concepts to modern application. J Prosthet Dent 2009;101:405-412
Besford J. N., Sutton A. F. Aesthetic possibilities in removable prosthodontics. Part 2: start with the face not the teeth when rehearsing lip support and tooth positions. BDJ 2018;224: 141-148.