Internet Edition

Issue No. 4, October 1998

Graduate Dental Research

The effect of Primary Surgery of the lip and palate on palatal morphology in complete unilateral cleft lip and palate children.

Dr Kelvin Foong
Senior Lecturer, Orthodontics
PhD Project

Superimposed on normal palatal growth of unilateral cleft lip and palate (UCLP) children is the constrictive effect of surgical scar tissue on the palatal segments. This study traces the changes in palatal dimensions of UCLP patients from the time of primary lip repair to 6 months post-primary closure of the palate using advanced 3-D laser imaging

Airway resistance in subjects with obstructive sleep apnoea

Dr Wong Dai Chong
Resident, Orthodontics
MDS Project

The purpose of this study is to compare nasal resistance of obstructive sleep apnoea patients with those of normal healthy adults. Nasal resistance is measured by means of rhinomanometry, a non-invasive procedure which records the change in pressure and the rate of airflow across the nose.

Long axis inclination changes of impacted third molars during orthodontic treatment

Dr Peer Augenreich
Visiting Resident, Orthodontics

This study comprises the evaluation of the inclination of impacted third molars prior to orthodontic treatment (T1) compared with the post-treatment results (T2) in a sample of 60 Asian orthodontics patients treated at the Faculty of Dentistry. The angulation measurements were taken from OPGs at T1 and T2 supplemented by linear measurements of the study casts. The different factors influencing the prognosis of thrid molars are discussed.

Dentofacial and Soft tissue Morphology inpatients with increased overjet

Dr Ronald Tan
Resident, Orthodontics
MDS Project

The aims of this study were to measure the Chinese dentofacial and soft tissue morphological differences between a sample of patients (N=30) with an overjet of >6mm (Class II Divisional) when compared to a control group (N=47) with normal overjet. Pre- and post-treatment changes were also assessed. For subjects with increased overjet, differences included increased maxillary incisor proclination, overjet and overbite, increased saggital soft tissue discrepancy (p<0.001) and upper lip prominence (p<0.01). Changes due to treatment showed a significant normalisation in these same variables (p<0.0001).

Airway resistance and craniofacial morphology in Indian subjects with obstructive sleep apnoea

Dr Wong Mei Ling
Resident, Orthodontics
MDS Project

The present study investigates the relationship between craniofacial form and airway dimension in an Indian cohort of patients with obstructive sleep apnoea, using natural head posture cephalometry and rhinomanometry to assist in diagnosis and management.

Craniofacial morphology and head posture in patients with difficult intubation for anaethesia

Dr Koh Kwong Fah
Associate Professor and Consultant
PhD Project

Endotracheal intubation is a common procedure performed during general anaethesia. Difficulty in intubation although not common carries with it significant morbidity and mortality. It would be useful to be able to predict which patients will be difficult to intubate. However, there have been a few reliable predictors. The aim of our study is to compare a group of patients known to be difficult with a control group, looking into their craniofacial morphology as well as their natural head posture. It is hoped that this will enable us to understand some of the mechanisms contributing to difficulty in intubation and as a result, formulate reliable predictors to identify this group of patients.

A Patient Centered Evaluation of Orthodontic Clinical Care

Dr Wong Tuck Yong
Resident, Orthodontics
MDS Project

The present study aims to investigate the standard of orthodontic treatment using two indices, Peer Assessment Rating (PAR) index and Anterior Occlusal Trait (AOT) index to assess patient satisfaction with treatment results. A sample of patients (N=76) who had recieved two-arched fixed orthodontic appliance treatment participated in the study which was carried out using a questionaire. The results of the study showed that the orthodontic treatment was accomplished toa very high standard with a great percentage of patients expressing satisfaction with treatment.

Cephalometric Reference Data for Singaporean Chinese Adults

Dr Patricia Yeong
Resident, Orthodontics
MDS Project

Since the introduction of cephalometrics by Broadbent in 1931, the use of cephalometrics extended from the study of facial form to the development of cephalometric standards for different ethenic and population groups. One set of cephalometric standards cannot be applied to all ethnic and population groups as racial characteristics may lead to differences in craniofacial morphology. Previous studies have focused on Caucasians. There are limited studies on the cephalometric craniofacial morphology of Chinese. This study aims to provide descriptive statistics on the craniofacial morphology of Singaporean Chinese adults to aid in the diagnosis, management and outcome assessment of orthodontic care in Singapore.

Analysis of new bone formation following use of allografts and alloplasts in bony defects adjacent to implants

William Chong Lai Leong
MSc Project

The aim of the study was to show the possibility of generating bone beyond the skeletal envelope using a non-porous barrier membrane. Implants beyond the outer cortical border of rabbit tibia and test sites covered with a membrane. Results showed significant amount of bone generation around test implants when compared with controls, thus verifying the role of a barrier membrane in guided bone generation.

Airway Dimension and Natural Head Posture in subjects with Obstructive Sleep Apnoea

Dr Ang Poh Kang
Resident, Orthodontics
MDS Project

There is currently little information on the role of upper airway abnormalities in Chinese. The study proposes, using lateral cephalograms, to determine the airway dimension and natural head posture in Chinese subjects with mild and moderately severe obstructive sleep apnoea in Singapore. Findings may be used to assist in diagnosis and management of obstructive sleep apnoea.

An Investigation of Permenant Dentition crown morphology in an Ethnic Chinese using Laser Scanning

Dr Kwek Meau Charm
Resident, Orthodontics
MDS Project

Many studies have been conducted ontooth measurements since the era of G V Black (1902). Conventionally teeth sizes are measured manually with sliding caliper, micrometer screw gauge, digitized calipers and digital micrometer. These forms of dental cast analysis based on two-dimensional contact measurement of teeth sizes incorporate many errors. It is the purpose of this study to investigate the permenant crown morphology based on study models using laser surface scanning. The fit of existing bracket system on the labial or buccal surfaces teeth is further determined.

Influence of heating on the mechanical properties of restorative casting alloys and their investments

Prof Chew Chong Lin
Professor, Restorative Dentistry
DDS Project

The purpose of this project is to study the mechanical properties of metal ceramic alloys and dental investments at high temperatures. Five commonly used metal ceramic alloys and three dental investments were selected for this study. The results from this project would provide insight into development of future dental alloys and investments.

Degradationmechanisms of composite resins occlusal contact area wear

Dr Adrian Yap
Asst Professor, Restorative Dentistry
PhD Project

In anticipation of using composite resins as an alternative for amalgam restorations, this project focuses on the problem of composite wear in stress-bearing areas. The study employs a scientific approach in which the variables of influence, including the effects of load, food-stimulating liquids and abrader materials, are separated and investigated using the BIOMAT-DIII wear simulator. The goal is to define degradation mechanisms of dental composite restoratives in occlusal contact area wear.

Effects of particle-reinforcement on the physio-mechanical properties of resin-modified glass ionomer cements?

Dr Sriram Mudambi
MSc Project

Although the physio-mechanical properties of resin-modified glass-ionomers (RMGIC) are superior to their conventional counterparts, they are still lower than that of composite restoratives. This study investigates the effects of particle-reinforcement on the physio-mechanical properties of RMGIC including hardness, flexural and compressive strengths. The porperties of these new experimental RMGIC were compared with RMGIC at varying power:liquid ratios.

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