Dental Asia March/April 2023

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TRENDS HKU Dentistry new jaw surgery concept is effective in treating moderate-to-severe obstructive sleep apnoea Obstructive sleep apnoea (OSA) is a condition in which the airway is blocked during sleep. It may cause multiple occurrences of hypopnea or apnoea during sleep. If left untreated, patients with OSA may experience reduced quality of life and health problems in more serious cases. Patients with moderate-to-severe OSA, i.e., AHI (apnoea-hypopnoea index) of 15 events or above per hour, may require surgery to enlarge their airway if non-surgical treatment such as the use of continuous positive air pressure ventilator fails. Surgical treatment of OSA involves the removal or repositioning of soft tissues (e.g., tonsils) or advancing the jaw to expand the upper airway, since patients with OSA often have smaller or recessed jaws. Jaw advancement surgery is an effective treatment for OSA. However, it may change the facial appearance and the bite, especially among Eastern Asians who usually have more protrusive lips than Caucasians. This makes it harder to perform jaw advancement surgery without compromising on facial aesthetics. The research team in the Oral and Maxillofacial Surgery (OMFS) of the Faculty of Dentistry at the University of Hong Kong (HKU) recently conducted a pilot study to measure if a newly conceptualised jaw surgery technique could help improve moderate-to-severe level OSA. The findings of the paper entitled Segmental mandibular advancement for moderate-tosevere obstructive sleep apnoea: a pilot study, now published in the International Journal of Oral and Maxillofacial Surgery, indicate that 3D surgical planning of the SMA as part of the jaw advancement surgery for patients with severe obstructive sleep apnoea this surgery can significantly alleviate sleep apnoea, and also maintain or even improve the patient’s appearance. All the patients involved in the study with moderate-to-severe OSA showed a 50% or more reduction in breathing disturbances at night after the surgery, and 58% of the patients were considered to be cured, showing no signs of sleep apnoea. The jaw surgery technique involves a multisegment osteotomy of the lower jaw called segmental mandibular advancement (SMA). It is a combination of a procedure to upright the anterior jaw segment to create space and a procedure to advance the whole lower jaw. The surgery is done to bring about significant enlargement of the skeletal airway at the base of the tongue, as well as an appealing aesthetic of the face and functional outcome in the bite. The lead researcher of the team, Dr Mike YY Leung, clinical associate professor in Oral and Maxillofacial Surgery, expressed that this multisegment jaw correction surgery as adopted in SMA has been used to correct facial deformities in Hong Kong for many years, but their study takes it several steps forward. “It was the first-ever study to prove that SMA could also effectively bring improvement in OSA. The uniqueness of facial features among the Eastern Asian population was the reason to use this method, which takes into consideration the aesthetics and jaw function on top of the significant airway expansion,” he said. Twelve patients in Hong Kong with moderateto-severe OSA, referred by different dentists, 14 DENTAL ASIA MARCH / APRIL 2023
TRENDS general practitioners, and ENT specialists were evaluated for this study. They received SMA as a major part of their jaw advancement surgery. AHI, the diagnostic tool used for measuring the presence and severity of OSA, can be classified into three categories. Mild AHI usually entails five to 15 apnoeic or hypopneic events per hour. Moderate AHI sees 16 to 30 events per hour, while severe AHI records more than 30 events per hour. The study found that the surgery helped improve pre-operative AHI from 42.4 events per hour to nine events per hour on average in one year post-operatively. Surgical success, as defined by a reduction of the initial AHI by 50% or more, was observed in 11 out of 12 patients. This implies that almost all the patients showed a 50% or more reduction in breathing disturbances at night. Surgical cure, as defined by an AHI of less than five events per hour — was also observed in seven out of 12 patients. Thus, 58% of the patients were cured after the surgery, showing no signs of sleep apnoea. On average, the airway volume was also found to have increased by 2.8 times after the surgery, allowing patients to breathe better. These figures remained constant during the one-year study period. There was no incidence of any major complications in the surgery, thus showing that SMA is potentially a safe and effective procedure for patients with severe OSA. Dr Joan CC Wan, co-investigator of the project, said the findings of the study are encouraging since they show significant improvement even in severe OSA cases as well as consistent results. “We believe the pilot study has set a cornerstone for a larger scale study that can observe the long-term effects of this technique and help us compare that with the other treatment methods for OSA,” said Dr Wan. DA Pre-operative Post-operative The pre-operative and post-operative airway images, showing a significant increase in the airway volume after SMA Research team members (from left) Dr Keira Chen, Dr Jasmine Chung, Dr Mike Leung, Dr Joan Wan and Dr Isla Fu DENTAL ASIA MARCH / APRIL 2023 15
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Page 4 and 5: CONTENTS 18 22 30 TRENDS 14 HKU Den
Page 6 and 7: EDITOR’S NOTE Era of dental revol
Page 8 and 9: DENTAL UPDATES Ackuretta launches A
Page 10 and 11: DENTAL UPDATES Dürr Dental partner
Page 12 and 13: DENTAL UPDATES Amann Girrbach prese
Page 14 and 15: DENTAL UPDATES Roland DGA announces
Page 18 and 19: TRENDS Artificial intelligence in d
Page 20 and 21: UNDER THE SPOTLIGHT Under one roof:
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Page 24 and 25: DENTAL PROFILE Same-day dentistry m
Page 26 and 27: DENTAL PROFILE At this time, busine
Page 28 and 29: CLINICAL FEATURE Next generation sy
Page 30 and 31: CLINICAL FEATURE used later. Into t
Page 32 and 33: CLINICAL FEATURE Using occlusion te
Page 34 and 35: CLINICAL FEATURE BRINGING DIGITAL A
Page 36 and 37: CLINICAL FEATURE Clinical managemen
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Page 41 and 42: USER REPORT Fig. 6: Post-operative
Page 43 and 44: View details of the programme on ou
Page 45 and 46: USER REPORT fabricated from the zir
Page 48 and 49: BEHIND THE SCENES Heralding the era
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Page 52 and 53: IN DEPTH WITH Choosing the best lou
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