Dental Asia November/December 2023

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BEHIND THE SCENES Fig. 2: Incorrect way to capture a shade communication image Fig. 3: The correct way to capture an image that contains complete information Fig. 4: Stone model of a distorted impression A good shade communication image must be able to provide: 1. Comparison between shade guide and the targeted tooth, not the abutment 2. Clear visibility of shade tab name 3. Incisal to incisal position between shade guide and targeted tooth, and 4. The choice of the closest shade, one shade lighter, one shade darker, and one extra shade if necessary for character Another thing to remember is to not use a diffuser or polariser excessively, to avoid diminishing the real colour of the teeth. Also, before sending the impression to the lab either digitally or traditionally, it is highly recommended to fill in the order form completely. IN THE LAB The next phase of communication is when the case arrives in the lab. Communication here focuses on checks from the technician’s side. The first thing that technicians will do after receiving an impression, either digitally or traditionally, is to check the margin finish line. Technicians need a clear margin to produce an accurate model that resembles the condition in the patient’s mouth. Impression checking also includes any distortion or unevenly pressed surface during impression. Breaching the minimum thickness will lead to weak restoration and increase the possibility of failure. After all these checks in the lab, technicians must be able to conclude and inform dentists about the safety and chance of success of the material. Technicians must be the ones that understand the character, strength, and risk of a material used in each case. When agreed between technician and dentist, production can commence. AFTER THE LAB The biggest forms of communication between dentists and technicians must take place before and in, not after the lab. Communication after the lab concerns feedback, troubleshooting, and action reviews. But in practice, many dentists and technicians still ignore the communication in these two phases which results in avoidable mistakes after the lab, after the restorations have been received by dentist or tried in the patient mouth. As discussed in the beginning, the foundation of communication between dentist and technician is a human relationship. Like all other relationships, it must be built upon open and receptive communication in both directions. DA Fig. 5: Example of a model that looks parallel from side view. Note that this is not the insertion direction view Fig. 6: From insertion direction view, both abutments are not parallel and causing undercuts to each other If the margins are clear and visible, the next area to be checked is the undercut. Technicians need to ensure that the preparation is free of undercut, regardless of the type of restoration. This means technicians can see the margin from one particular insertion direction without any obstruction, from both the abutment itself and adjacent teeth. For bridges that involve multiple abutments, technicians might check for undercuts from several directions which show the least or no undercuts for all abutments. Another specification that technicians will check is the interocclusal clearance. Every material needs to achieve its minimum thickness to get its optimum strength. ABOUT THE AUTHOR Dr Kelvin Tantono is the founder and chief dental technician at Zirmon Dental Atelier. He graduated from Trisakti University in 2012 and gained clinical experience in Jakarta and Binjai followed by his private practice in Medan, Indonesia. After more than five years of clinical practice, he decided to follow his heart and pursue the field of dental ceramics and has not looked back since. He completed the international programme at the Osaka Ceramic Training Centre and underwent various training under international experts in the ceramics field. 46 DENTAL ASIA NOVEMBER / DECEMBER 2023
BEHIND THE SCENES Pressure or vacuum? How to choose the right dental thermoforming machine for your practice Thermoforming is an integral component of many dental applications, including mouthguards, retainers, aligners, and splints. Choosing the right thermoforming machine, however, can be a challenge given the array of options available. By Peter Herring, advanced certificate complete dental prosthetics, diploma dental technology There is a diverse range of dental thermoforming applications — from temporary crowns, dentures, and bleaching trays to more advanced appliances such as surgical guides and snoring appliances. The type of machine best suited for your needs will largely depend on the kind of products you want to make and in what volume. For instance, dental surgeries looking to make basic in-house whitening trays, mouthguards, and the occasional splint might find an automatic rapid vacuum unit most beneficial, given its ease of use by various staff with minimal training. Meanwhile, orthodontic practices focused on bulk retainers and aligners based on 3D-printed models may lean towards automatic pressure units and particularly, for high volume production, pressure units with an external air supply. Production labs would potentially employ both types of machines, leveraging the strengths of each to produce a broader range of appliances. Fig. 1: The material is “pushed” onto the model in a closed chamber with positive pressure of up to six atmospheres. With these machines, the forming pressure is high enough, and they will normally produce good results but can be technically more demanding Comparing the intricacies of both pressure and rapid vacuum thermoforming machines, potential buyers can make an informed choice based on their specific needs. PRESSURE VS RAPID VACUUM Pressure machines Operation: These units operate using either an external compressed air source or an inbuilt compressor, exerting forming pressures of up to six atmospheres. DENTAL ASIA NOVEMBER / DECEMBER 2023 47
Page 1 and 2: www.dentalasia.net NOVEMBER / DECEM
Page 4 and 5: CONTENTS TRENDS 11 A growing region
Page 6 and 7: EDITOR’S NOTE Something in the Ai
Page 8 and 9: DENTAL UPDATES Straumann Group acqu
Page 10 and 11: DENTAL UPDATES Mirco Stiehle and Mi
Page 12 and 13: DENTAL UPDATES Chamlion partners wi
Page 14 and 15: TRENDS successful proof-of-concept
Page 16 and 17: UNDER THE SPOTLIGHT DGX A100 based
Page 18: Moreover, companies may not be will
Page 21 and 22: UNDER THE SPOTLIGHT problem, plus y
Page 23 and 24: UNDER THE SPOTLIGHT A second artifi
Page 25 and 26: DENTAL PROFILE Furthermore, with th
Page 27 and 28: DENTAL PROFILE “Our main priority
Page 29 and 30: DENTAL PROFILE singular platform fo
Page 31 and 32: CLINICAL FEATURE Using a 3D-printer
Page 33 and 34: CLINICAL FEATURE Quadrant Dentistry
Page 35 and 36: CLINICAL FEATURE structurally compr
Page 37 and 38: CLINICAL FEATURE inclines, both in
Page 39 and 40: CLINICAL FEATURE Statistics The Wil
Page 41 and 42: USER REPORT Taking the first step i
Page 43 and 44: USER REPORT The IOS price war: Adva
Page 45 and 46: USER REPORT Rubber dam isolation By
Page 47: BEHIND THE SCENES Communicating tow
Page 51 and 52: invis is a comprehensive approach t
Page 53 and 54: Dr Dagnelid (left) will be speaking
Page 55 and 56: IN DEPTH WITH In addition to the pa
Page 57 and 58: SCAN TO REGISTER THE LEADING DENTAL
Page 59 and 60: PRODUCT HIGHLIGHTS Pac-Dent introdu
Page 61 and 62: PRODUCT HIGHLIGHTS ASI Dental Speci
Page 63 and 64: DUAL CURING CORE & RESIN CEMENT 3 I
Page 65 and 66: EVENTS CALENDAR 2023 NOVEMBER 9 - 1
Page 67: INSIGHTS P A L M A D E M A L L O R

Dental Asia November/December 2023

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