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The neutral zone in complete dentures : principles and technique
01 Jan 1973-
About: The article was published on 1973-01-01 and is currently open access. It has received 17 citations till now. The article focuses on the topics: Dentures & Neutral zone.
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TL;DR: The neutral zone technique is an alternative technique for the construction of complete dentures with severely resorbed ridges and is the most effective method for the management of lower denture instability.
Abstract: Incorrect tooth placement and arbitrary shaping of the polished surfaces may have an adverse effect on the success of the prosthesis. This is particularly true for patients with reduced mandibular residual ridges, yielding flat or concave foundations due to severe bone resorption.The neutral zone technique is an alternative technique for the construction of complete dentures with severely resorbed ridges. It is the most effective method for the management of lower denture instability. The technique is by no means new but is a valuable practical approach to clinicians.
44 citations
TL;DR: Deficiencies in the literature were found, including materials and techniques for recording the neutral zone, the comparison of different neutral zone dentures, and the effect of the period of edentulism on theneutral zone.
Abstract: Several studies have been published on the neutral zone regarding materials, techniques, and different prostheses; however, the data are incongruent, and a literature review was necessary. This review summarizes the literature on the neutral zone and identifies deficiencies suggesting future research. The English language peer-reviewed dental literature was reviewed from the period January 1, 1900 to June 30, 2011. Articles were searched in Medline (PubMed) and Google scholar for the term "neutral zone" and were supplemented by a hand search in prosthodontic publications. Deficiencies in the literature were found, including materials and techniques for recording the neutral zone, the comparison of different neutral zone dentures, and the effect of the period of edentulism on the neutral zone.
33 citations
TL;DR: The differences in the flange form measurement and the distances among the impressions made with the same technique and material were small, and the reproducibility can be considered clinically acceptable.
Abstract: A study was made on four patients to determine the reproducibility of the outer form of the buccal and lingual flanges of a complete lower denture as developed by functional movements of the surrounding tissues. 1. Two dentists participated in the study to find out the operator effect when making impressions for the functional form of the flanges. 2. Two tissue-conditioning impression materials were used to determine if the characteristics of the impression material had any effect on the final form. 3. The impression materials were applied to the denture flanges by two different methods. 4. The impressions were placed in a mitre ☐, stabilized with plaster, and sectioned in the molar, premolar, and incisor regions. This provided five cut surfaces for measuring. 5. Each section was measured at five to six representative distances. 6. The differences in the flange form measurement and the distances among the impressions made with the same technique and material were small, and the reproducibility can be considered clinically acceptable. 7. There were statistically significant differences in the flange form measurement distances among the different materials and method of application of the material.
22 citations
Journal Article•
TL;DR: Although the N-Gn distance cannot be taken as absolutely reliable, owing to its simplicity and practical applicability it can be recommended for use in everyday clinical practice in combination with other methods for the determination of the vertical dimension of occlusion.
Abstract: In clinical practice, fully precise method for exact determination of vertical relation of occlusion still does not exist. This study examines the relationship between different craniofacial distances and the distance subnasale-gnathion (Sn-Gn), which represents the lower third of the face in vertical relation determination. The highest coefficient of correlation was (r = 0.8678, p < 0.05) between the distance eye-ear (E-E = lateral border of the ocular orbit-medial opening of the meatus of the external auditory canal) and Sn-Gn. The prediction of the distance Sn-Gn could be determined through the formula: Sn-Gn = E-E/1.08 or through the regression analysis: Sn-Gn = 1.9197 + 0.6449 x E-E. None of the calculated coefficients of correlation was 1, but was < 1, so that the prediction of the distance Sn-Gn by craniometric distances is not absolutely reliable, although it is considerably helpful. Our results point at the variations of craniofacial distances in the Croatian population. Yet, craniometry could still be recommended in everyday clinical practice for prediction of vertical relation of occlusion, as it is a simple, economic and non-invasive method, however in combination with some other methods, which have proved to be helpful.
20 citations
TL;DR: The prosthesis should replace not only missing teeth but also lost soft tissues and bone, including the hard palate, residual alveolar ridges, and in some situations, the soft palate.
Abstract: Patients with complete avulsion of the palate may require extensive surgical and prosthodontic rehabilitation. The prosthesis should replace not only missing teeth but also lost soft tissues and bone, including the hard palate, residual alveolar ridges, and in some situations, the soft palate. This clinical report describes the prosthetic rehabilitation, after appropriate surgical options had been exhausted, of a patient with bilateral traumatic avulsion of the maxilla.
16 citations