Dental Asia Jul/Aug 2018

44 DENTAL ASIA JULY / AUGUST 2018 User Report Introduction ‘ T o o t h l o s s a n d r e h a b i l i t a t i on w i t h d e n t u r e s c a n h a v e tremendous patient i mp a c t a n d s o c i a l i mp l i c a t i on s . I n a n image-conscious society, dentures restore a sense of normalcy and allow the patient the ability to interact with others’ (Roumanas, 2009). The aims of denture treatment are replacement of missing teeth to restore function, aesthetics and phonetics along with maintaining healthy oral tissues (Figs. 1a-b). are part of the denture bases, which rest on moveable and displaceable tissues. Denture teeth tend to work as a functional group and there is no feedback mechanism. Premature deƪective contacts between artificial teeth cause movement of the denture resulting in possible damage to the supporting tissues. Complete dentures The construction of complete dentures involves a number of clinical and laboratory stages that may include some or all of the following: • Primary impressions – these are the initial impressions of the patient’s edentulous arches recorded in the surgery. The dental technician would then cast stone models from these impressions and construct custom trays (Fig. 2). will provide guidance to the technician for the set up of anterior teeth on the denture. The posterior teeth are then set up in occlusion in order to provide the patient with an acceptable appearance and adequate function • Denture try-in – the artiƤcial teeth are set up on wax by the technician and the clinician will try the dentures in the patient’s mouth to ensure to check the appearance, phonetics and function (Fig. 3) Dr. Roy Dixon introduces Enigmalife dentures – a new concept in posterior denture teeth design A New Concept in Posterior Denture Teeth Design By Dr. Roy Dixon , BDS MA MGDS RCSI Figs. 1a-b: Edentulous ridges Fig. 2: Primary impression – doric easy Ƥrst/Flo-light in Schottlander edentulous tray Fig. 4: Digital dentures – planning the occlusion Fig 1a Fig 1b The denture occlusal scheme plays an important role in achieving these aims by minimising trauma to the supporting structures, enhancing the stability of the dentures and facilitating function. Natural teeth are suspended in the bone by the periodontal ligament, which acts as a shock absorber. This means that natural teeth act individually, with the ligament providing a biofeedback mechanism. Denture teeth • Secondary impressions – the custom trays are then used to record accurate and more detailed impressions • Jaw relation– the dental technician will construct wax rims onmodels produced from these initial impressions, which are representative of the position of the patient’s original teeth. The rims are modified in the surgery to reƪect the current clinical situation and Fig. 3: Dentures set up for wax try-in • Denture Ƥt – once the try-in has proved acceptable, the trial dentures are processed and Ƥnished and the dentist or the clinical dental technicianƤnally Ƥts the dentures. Occlusion can be defined as the relationship of themaxillary andmandibular teeth when they are in functional contact during mandibular activity. The challenge faced by the dental technician is to establish a functional occlusion for the patient using artiƤcial posterior teeth, as he may have little or no information about the patient’s natural teeth and their occlusal scheme.