The primary piezographic mandibular impression: a case report
H Chraief*
Department of complete denture, Research Laboratory of Oral Health & Oro Facial Rehabilitation LR12ES11, Faculty of Dental Medicine, Avicenna Street 5019 Monastir, Monastir University, Tunisia
Submission: December 17, 2019 Published: January 24, 2020
*Corresponding author: Pablo Bonilla, Laboratory of Nanostructures, Faculty of Chemical Sciences, Central University of Ecuador, University Avenue, Ecuador
How to cite this article: H Chraief, Department of complete denture, Research Laboratory of Oral Health & Oro Facial Rehabilitation LR12ES11, Faculty of Dental Medicine, Avicenna Street 5019 Monastir, Monastir University, Tunisia10.19080/ADOH.2019.11.555827
Abstract
The number of patients with very resorbed mandibular crests (III and IV) continues to increase and pose a challenge during prosthetic rehabilitation with the conventional full removable prosthesis. The piezographic impression is an interesting alternative especially in case of impossibility of implant treatment. It allows making a prosthesis integrating functional muscle play (lingual and labio-jugal) [1]..
Keywords: Resorbed Crest; Piezographic Impression; Prosthodontics Treatment
Introduction
Patients with a strongly absorbed mandibular crest are increasingly noticed at the consultation of the Monastir Dental Medicine clinic. This is due to the increasing number of geriatric patients following the improvement in life expectancy and medical care in Tunisia [2,3].
Presentation of the Case
The case is about a 63-year-old diabetic patient who presented for complete bimaxillary rehabilitation after failure of several previous prosthetic treatments. The clinical examination reveals a very old bimaxillary total edentation with a negative mandibular crest, an enlarged tongue and buccal floor and a very toned lower lip covering the anterior region of the crest at rest [4,5]. The technique consists of taking a conventional alginate impression, pouring the plaster model, adjusting a wire on the model first and then adjusting in the mouth [6]. This wire should perfectly fit the top of the ridge and reach the piriform eminences (Figures 1 & 2). This wire will be coated with any polysulfide material like Kerr permlastic (Figures 3 & 4). Before its introduction in the mouth, the patient’s lips must be vaselined to avoid any adhesion to the material, the patient is then required to read a text (phonetic piezography) until the material is set; the impression is then removed (Figures 5 & 6). A second impression is made by adding material to the piezogram obtained and reinserted in the mouth and the same phonetic test is requested from the patient (Figure 7). This gives a piezographic primary impression which will be sent to the laboratory for formwork and casting of the primary model (Figures 8 & 9). There is a clear difference between a model from a conventional footprint and that of a piezographic footprint (Figures 10 & 11).
References
- Rokhssi H, Abdelkoui A, Merzouk N, Benfdil F (2018) The piezographic impression technique in daily practice. AOS pp. 289.
- Klein P (1988) Quelques définitions pour mieux comprendre la piezographie. Info Dent 29: 2519-2523.
- Nabid A, Piézologie (1996) Applications Clinique. Encycl Méd Chir, Stomatologie-Odontologie.
- Ben Brahem H (2011) La piézographie mandibulaire phonétique: théorie et pratique, Editions Universitaires Européennes, Paris.
- Arora A, Kaur I, Duggal A, Arora PC (2014) Management of atrophic mandibular ridge using neutral zone technique: a case report. Indian J Comprehens Dent Care 4(2): 455-459.
- Agrawal KK, Singh SV, Vero N, Alvi HA, Chand P, et al. (2012) Novel technique to register neutral zone. J Oral Biol Craniofacial Res 2(3): 198-202.