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  1. Ngeow WC, Shim CK, Chai WL
    J Can Dent Assoc, 2006 Dec;72(10):927-31.
    PMID: 17187708
    Unintended intravascular injection from inferior alveolar nerve blocks can result in frustrating distant complications affecting such structures as the middle ear and eyes. Possible complications affecting the eyes include blurring of vision, diplopia, mydriasis, palpebral ptosis and amaurosis (temporary or permanent). In this article, we present a complication that has been reported only rarely. Two patients developed transient loss of power of accommodation of the eye resulting in blurred vision after routine inferior alveolar nerve blocks on the ipsilateral side. Clear vision returned within 10-15 minutes after completion of the blocks. The possible explanation for this phenomenon is accidental injection into the neurovascular bundle of local anesthetic agents, which were carried via the blood to the orbital region. This resulted in paralysis of a branch of cranial nerve III, the short ciliary nerves that innervate the ciliary muscle, which controls accommodation.
  2. Ong ST, Shim CK, Ng KH, Siar CH
    J Oral Sci, 2004 Mar;46(1):55-9.
    PMID: 15141725
    Osteosarcomas are highly malignant neoplasms of bone that are challenging to diagnose. These neoplasms often show atypical behavior. In the initial phase they may present as nondescript bony swellings with an indolent growth rate, only to become overtly aggressive and malignant towards the later phase of the disease. Similarly, the histological growth pattern of this neoplasm can be quite diverse, presenting with areas that mimic benign myofibroblastic tumors, giant cell granulomatous conditions and partial encapsulation. The final diagnosis of an osteosarcoma is often reached after thorough sampling and examination of multiple biopsy specimens. All these clinical features and histological diagnostic difficulties were encountered in a case of osteosarcoma affecting the right mandible of a 62-year-old Chinese woman described here. The diagnostic lessons accrued from this case are discussed.
  3. Raman S, Shafie AA, Abraham MT, Shim CK, Maling TH, Rajendran S, et al.
    PLoS One, 2021;16(5):e0251760.
    PMID: 33984051 DOI: 10.1371/journal.pone.0251760
    Oral cancer has been recognized as a significant challenge to healthcare. In Malaysia, numerous patients frequently present with later stages of cancers to the highly subsidized public healthcare facilities. Such a trend contributes to a substantial social and economic burden. This study aims to determine the cost of treating oral potentially malignant disorders (OPMD) and oral cancer from a public healthcare provider's perspective. Medical records from two tertiary public hospitals were systematically abstracted to identify events and resources consumed retrospectively from August 2019 to January 2020. The cost accrued was used to estimate annual initial and maintenance costs via two different methods- inverse probability weighting (IPW) and unweighted average. A total of 86 OPMD and 148 oral cancer cases were included. The initial phase mean unadjusted cost was USD 2,861 (SD = 2,548) in OPMD and USD 38,762 (SD = 12,770) for the treatment of cancer. Further annual estimate of initial phase cost based on IPW method for OPMD, early and late-stage cancer was USD 3,561 (SD = 4,154), USD 32,530 (SD = 12,658) and USD 44,304 (SD = 16,240) respectively. Overall cost of late-stage cancer was significantly higher than early-stage by USD 11,740; 95% CI [6,853 to 16,695]; p< 0.001. Higher surgical care and personnel cost predominantly contributed to the larger expenditure. In contrast, no significant difference was identified between both cancer stages in the maintenance phase, USD 700; 95% CI [-1,142 to 2,541]; p = 0.457. A crude comparison of IPW estimate with unweighted average displayed a significant difference in the initial phase, with the latter being continuously higher across all groups. IPW method was shown to be able to use data more efficiently by adjusting cost according to survival and follow-up. While cost is not a primary consideration in treatment recommendations, our analysis demonstrates the potential economic benefit of investing in preventive medicine and early detection.
  4. Mohd Desa SNF, Doss JG, Kadir K, Ch'ng LL, Kok TC, Jelon MA, et al.
    PMID: 38637182 DOI: 10.1016/j.ijom.2024.03.002
    Communication is an integral component of effective healthcare delivery to patients, and this includes breaking bad news (BBN). However, clinicians in dentistry are rarely exposed to diseases that can negatively and seriously affect an individual's view of their future and pose a mortality risk, except for oral cancer. The aim of this study was to assess clinician practices in BBN of oral cancer diagnosis in Malaysia. An exploratory sequential mixed-methods study design was used. A qualitative study was conducted among 12 clinicians to gather relevant information regarding their practices in BBN of oral cancer diagnosis using a descriptive-interpretive approach. The themes that emerged were preparation for BBN, BBN setting, communication, emotional aspects, and summarizing the session. These themes were used to develop a questionnaire with 34 items. In the quantitative study, this questionnaire was sent to 87 clinicians who had experienced BBN of oral cancer diagnosis in the past 5 years; the response rate was 100%. An arbitrary cut-off score between the third and fourth quartiles was set to distinguish 'good' and 'poor' practice in BBN among the clinicians. The data analysis was performed using IBM SPSS Statistics version 23.0. Overall, at least two-thirds of the clinicians had good practices in BBN of oral cancer diagnosis. The clinicians' designation (oral and maxillofacial surgery consultant/specialist vs dental officer) and BBN experiences were factors associated with their practices in BBN of oral cancer diagnosis.
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