MyMedR

Effects of different implant-abutment connections on micromotion and stress distribution: prediction of microgap formation

Saidin S, Abdul Kadir MR, Sulaiman E, Abu Kasim NH

J Dent, 2012 Jun;40(6):467-74.

PMID: 22366313 DOI: 10.1016/j.jdent.2012.02.009

The aim of this study was to analyse micromotion and stress distribution at the connections of implants and four types of abutments: internal hexagonal, internal octagonal, internal conical and trilobe.

Matched MeSH terms: Mandible/anatomy & histology

Dimensional profile of oral mucosa around combined tooth-implant-supported bridgework in macaque mandible

Siar CH, Toh CG, Ali TB, Seiz D, Ong ST

Clin Oral Implants Res, 2012 Apr;23(4):438-46.

PMID: 21435011 DOI: 10.1111/j.1600-0501.2010.02145.x

A stable oral mucosa is crucial for long-term survival and biofunctionality of implants. Most of this evidence is derived from clinical and animal studies based solely on implant-supported prosthesis. Much less is known about the dimensions and relationships of this soft tissue complex investing tooth-implant-supported bridgework (TISB). The aim here was to obtain experimental evidence on the dimensional characteristics of oral mucosa around TISB with two different abutment designs.

Matched MeSH terms: Mandible/surgery*

Cephalometric analysis of Malay children with and without unilateral cleft lip and palate

Ebin LE, Zam NM, Othman SA

Aust Orthod J, 2010 Nov;26(2):165-70.

PMID: 21175027

To investigate the craniofacial morphology of Malay children with repaired UCLP and compare the data with non-cleft Malay children.

Matched MeSH terms: Mandible/pathology

Fulltext Outcomes of placing short implants in the posterior mandible: a preliminary randomized controlled trial

Al-Hashedi AA, Taiyeb-Ali TB, Yunus N

Aust Dent J, 2016 06;61(2):208-18.

PMID: 25966305 DOI: 10.1111/adj.12337

BACKGROUND: Short dental implants can be an alternative to bone augmentation procedures at sites of reduced alveolar bone. Most studies on short implants are retrospective or multicentre reports that lack controlled and consistent comparison between different systems. This study aimed to compare clinical and radiographic outcomes of short implants in two different systems in the posterior mandible.

METHODS: Twenty patients with two adjacent missing posterior teeth were recruited. Patients were assigned equally and randomly into two groups; Bicon(®) (6 or 8 mm) and Ankylos(®) (8 mm) implants. A two-stage surgical approach and single crowns were used for implant placement and loading. Outcomes included peri-implant clinical parameters, implant stability (Periotest values; PTVs) and peri-implant bone changes, which were assessed at baseline, 2, 6 and 12 months post-loading.

RESULTS: No implant loss was encountered up to 12 months post-loading. No significant difference in the clinical or radiographic parameters was observed except for PTVs (p < 0.05) that was lower in Ankylos(®) implants.

CONCLUSIONS: The use of short dental implants was associated with excellent 12 months clinical and radiographic outcomes. Ankylos(®) and Bicon(®) implants demonstrated similar peri-implant soft tissue and alveolar bone changes. However, Ankylos(®) implants demonstrated better implant stability at all evaluation intervals.

Matched MeSH terms: Mandible/surgery*

Cephalometric analysis of Deutero-Malay Indonesians

Munandar S, Snow MD

Aust Dent J, 1995 Dec;40(6):381-8.

PMID: 8615744

A cephalometric study using Downs' analysis was undertaken with lateral cephalometric radiographs for a mixed sample of 50 child, adolescent and young adult Indonesians who presented with Angle Class I occlusions. Significant differences between this study group and the published results from comparative racial types were found for Downs' angle of convexity, Y-axis and incisor inclinations, indicating that Indonesians can be differentiated from other races with similar occlusions by using Downs' analysis.

Matched MeSH terms: Mandible/pathology

Three-dimensional image analysis of developing mandibular third molars apices for age estimation: A study using CBCT data enhanced with Mimics & 3-Matics software

Asif MK, Nambiar P, Ibrahim N, Al-Amery SM, Khan IM

Leg Med (Tokyo), 2019 Jul;39:9-14.

PMID: 31158731 DOI: 10.1016/j.legalmed.2019.05.003

Three-dimensional imaging has improved the method of analysis in many forensic science investigations. The study aimed to derive regression equation for age estimation by investigating the relationship between chronological age and surface area of the developing mandibular 3rd molars apices. Furthermore, other predictor variables: ethnicity (Malay and Chinese), gender and status of the root development completion (open/closed apices) were also investigated in terms of fit to the age estimation model. One hundred and twenty eight training and 55 validation samples of intact mandibular 3rd molars were selected from 183 CBCT scans. The samples comprised of 93 Malays and 90 Chinese, ranging in age from 13 to 24 years. Three-dimensional image modeling and surface area analysis of the developing mandibular 3rd molars apices were performed using Mimics and 3-Matics software. Multiple linear regression analysis was used to derive age estimation model using chronological age as a dependent variable and surface area of the apices, ethnicity, gender and status of the root development completion (open/closed apices) as predictor variables. A strong inverse correlation (r = 0.95, SD = 1.144) was observed between chronological age and all the predictor variables. The results showed that 89.6% of the variation in age can be explained by the predictor variables. Mean absolute error (MAE) value of 0.8223 was observed when the derived regression equation was tested on the independent validation sample. In conclusion, three-dimensional surface area analysis of the developing mandibular 3rd molars apices can be used as a reliable method for age estimation.

Matched MeSH terms: Mandible*

Iatrogenic displacement of high-speed bur during third molar removal

Rajaran JR, Nazimi AJ, Rajandram RK

BMJ Case Rep, 2017 Sep 27;2017.

PMID: 28954756 DOI: 10.1136/bcr-2017-221892

Surgical removal of impacted mandibular third molar is a routine procedure in oral surgery. Various iatrogenic complications related to the procedure has been discussed well in the literatures before. Some of these complications are related to the wrong usage of instruments and techniques. Here we discuss a rare complication on a 42-year-old male, related to the use of high-speed handpiece drill in mandibular third molar removal in a general dental office setting. He was referred when a high speed tungsten carbide bur was accidentally broken and displaced into the mandibular bone during surgical procedure. It is not common to use a high-speed handpiece in impacted third molar removal. This iatrogenic complication could have been totally avoided with the use of proper equipment and technique; therefore raising awareness regarding wrong usage of instrument is vital to avoid similar incidents in the future.

Matched MeSH terms: Mandible*

Relapse of B-cell acute lymphoblastic leukaemia presenting as right aural polyp with facial and mandibular nerves palsy

Shiun Chuen C, Md Daud MK, Che Jalil NA, Hazmi H

Med J Malaysia, 2017 10;72(5):318-320.

PMID: 29197892 MyJurnal

A patient presenting with an ear polyp is a common finding in otorhinolaryngology practice. The common causes include chronic otitis media and cholesteatoma. We report an adult female patient with a history of acute leukaemia presenting with chronic otitis media symptoms and right ear polyp. She was subsequently diagnosed as relapse of B-cell acute lymphoblastic leukaemia based on histopathological examination. The presentation may be similar to an inflammatory pathology of the middle ear, making it misleading.

Matched MeSH terms: Mandible/physiopathology*

Retromolar foramen and canal: a comprehensive review on its anatomy and clinical applications

Kumar Potu B, Jagadeesan S, Bhat KM, Rao Sirasanagandla S

Morphologie, 2013 Jun;97(317):31-7.

PMID: 23806306 DOI: 10.1016/j.morpho.2013.04.004

The retromolar foramen (RMF) and retromolar canal (RMC) are the anatomical structures of the mandible located in retromolar fossa behind the third molar tooth. This foramen and canal contain neurovascular structures which provide accessory/additional innervation to the mandibular molars and the buccal area. These neurovascular contents of the canal gain more importance in medical and dental practice, because these elements are vulnerable to damage during placement of osteointegrated implants, endodontic treatment and sagittal split osteotomy surgeries and a detailed knowledge of this anatomical variation would be vital in understanding failed inferior alveolar nerve blockage, spread of infection and also metastasis. Although few studies have been conducted in the past showing the incidence and types in different population groups, a lacunae in comprehensive review of this structure is lacking. Though this variation posed challenging situations for the practicing surgeons, it has been quite neglected and the incidence of it is not well presented in all the textbooks. Hence, we made an attempt to provide a consolidated review regarding variations and clinical applications of the RMF and RMC.

Matched MeSH terms: Mandible/anatomy & histology*; Mandible/surgery

An ex vivo culture model for orthodontically induced root resorption

Wan Hassan WN, Stephenson PA, Waddington RJ, Sloan AJ

J Dent, 2012 May;40(5):406-15.

PMID: 22342686 DOI: 10.1016/j.jdent.2012.02.002

Root resorption is a ubiquitous although undesirable sequela to orthodontic treatment. Current methods to investigate the pathophysiology have certain limitations. In pursuit to understand and develop treatment modalities for orthodontically induced root resorption, the ability to manipulate cells within their natural extracellular matrix in a three dimensional organotypic model is invaluable. The study aimed to develop a laboratory-based organotypic model to investigate the effect of orthodontic forces on the periodontium.

Matched MeSH terms: Mandible/anatomy & histology; Mandible/cytology

Lim MY, Lim WW, Rajan S, Nambiar P, Ngeow WC

Eur Arch Paediatr Dent, 2015 Oct;16(5):397-407.

PMID: 25894248 DOI: 10.1007/s40368-015-0184-x

To observe age-related changes in the locations of mandibular foramen (MF) and mental foramen (mf) using dental panoramic tomographs (DPTs).

Matched MeSH terms: Mandible/growth & development*; Mandible/radiography

Oral extranodal non Hodgkin's lymphoma: series of forty two cases in Malaysia

Ramanathan A, Mahmoud HA, Hui LP, Mei NY, Valliappan V, Zain RB

Asian Pac J Cancer Prev, 2014;15(4):1633-7.

PMID: 24641380

BACKGROUND: Lymphoma is a malignant neoplasm of lymphoid tissue classified into Hodgkin's and non-Hodgkin's types. It mostly affects lymph nodes although a considerable proportion of Non-Hodgkin's cases occur in extranodal sites.

MATERIALS AND METHODS: Selected cases diagnosed as non-Hodgkin's lymphoma (NHL) during the period of 1980 to 2012 were retrieved from the archives of the Oral Pathology Diagnostic Laboratory, Faculty of Dentistry, University of Malaya. The sections from the formalin-fixed paraffin embedded tissue blocks were stained with H and E as well as with LCA, CD20, and CD3.

RESULTS: The mean age was 41.6 years with a male: female ratio of 1.3:1. Out of the forty two cases, nineteen were Malays, eighteen were Chinese, followed by Indians (3) and Indonesians (2). The most common site of involvement was the mandible (22.2%), followed by the maxilla and palate (19.4% each). Most of the lesions presented as a painless progressive swelling. Only thirty six cases were further subdivided into B or T cell types. The majority were B-cell type (26 cases), of these 6 cases were Burkitt's lymphomas. Only ten cases were T-cell lymphoma, with three cases of NK/T-cell lymphoma.

CONCLUSIONS: In this series of 42 patients diagnosed as extranodal non-Hodgkin's lymphoma, the lesions appeared as painless swellings, mostly in men with the mandible as the most frequent site of involvement. Majority were B-cell lymphomas with Malays and Chinese being equally affected whereas lymphomas were rare in the Indian ethnicity. T-cell lymphomas were found to be common in the Chinese ethnic group.

Matched MeSH terms: Mandible/pathology

The application and correlation of Pont's Index to the facial framework of three main ethnic groups in Malaysia

Purmal K, Alam MK, Moganadass DD, Zakariat NN, Cheong NW

Aust Orthod J, 2013 May;29(1):34-42.

PMID: 23785936

To assess the applicability of Pont's Index in a Malaysian population by obtaining baseline measurements of dental arch shape based on premolar arch width, molar arch width and the combined width of the maxillary incisors. A secondary aim was to determine whether a correlation exists between arch widths, Pont's Index and the facial framework.

Matched MeSH terms: Mandible/anatomy & histology

Postnatal treatment factors affecting craniofacial morphology of unilateral cleft lip and palate (UCLP) patients in a Japanese population

Alam MK, Iida J, Sato Y, Kajii TS

Br J Oral Maxillofac Surg, 2013 Dec;51(8):e205-10.

PMID: 23099108 DOI: 10.1016/j.bjoms.2012.10.001

We have evaluated the craniofacial morphology of Japanese patients with unilateral cleft lip and palate (UCLP) and assessed the various postnatal factors that affect it. Lateral cephalograms of 140 subjects (mean (SD) aged 7 (2) years) with UCLP were taken before orthodontic treatment. Surgeons from Hokkaido University Hospital had done the primary operations. The craniofacial morphology was assessed by angular and linear cephalometric measurements. Cheiloplasty, palatoplasty, and preoperative orthopaedic treatment were chosen as postnatal factors. To compare the assessments of the postnatal factors, we made angular and linear cephalometric measurements for each subject and converted them into Z scores in relation to the mean (SD) of the two variables. Subjects treated by the modified Millard cheiloplasty had larger sella-nasion-point A (SNA) and nasion-point A-pogonion (NA-POG) measurements than subjects treated by the modified Millard with a vomer flap cheiloplasty. Two-stage palatoplasty showed consistently better craniofacial morphology than the other palatoplasty. Subjects who had preoperative orthopaedic treatment with a Hotz plate had significantly larger upper incisor/sella-nasion (U1-SN) measurements than who had no preoperative orthopaedic treatment or an active plate. We conclude that in subjects treated by a modified Millard type of cheiloplasty, a two-stage palatoplasty, and a Hotz plate there were fewer adverse effects on craniofacial morphology.

Matched MeSH terms: Mandible/pathology

Zygomatic implant-retained fixed complete denture for an elderly patient

Baig MR, Rajan G, Yunus N

Gerodontology, 2012 Jun;29(2):e1140-5.

PMID: 21615782 DOI: 10.1111/j.1741-2358.2010.00433.x

Dental rehabilitation of a completely edentulous geriatric patient has always been a challenge to the clinician, especially in treating those with higher expectations and demands. Treatment duration and the amount of residual alveolar bone available are often important considerations when planning for dental implant-based fixed treatment for these patients. With the introduction of zygomatic implants, a graftless alternative solution has emerged for deficient maxillary bone with provision for immediate loading. This article describes the treatment of a completely edentulous elderly patient using zygomatic implants in conjunction with conventional implants. The implants were immediately loaded using a definitive acrylic resin fixed denture reinforced with a cast metal framework, to provide function and aesthetics.

Matched MeSH terms: Mandible/surgery

Tooth size and dental arch dimensions: a stereophotogrammetric study in Southeast Asian Malays

Al-Khatib AR, Rajion ZA, Masudi SM, Hassan R, Anderson PJ, Townsend GC

Orthod Craniofac Res, 2011 Nov;14(4):243-53.

PMID: 22008304 DOI: 10.1111/j.1601-6343.2011.01529.x

To investigate tooth size and dental arch dimensions in Malays using a stereophotogrammetric system.

Matched MeSH terms: Mandible/anatomy & histology

The use of implants in the occlusal rehabilitation of a partially edentulous patient: a clinical report

Yunus N, Abdullah H, Hanapiah F

J Prosthet Dent, 2001 Jun;85(6):540-3.

PMID: 11404753

This article describes the occlusal rehabilitation of a partially edentulous patient who did not want a removable partial denture. Implants and extensive fixed restorations were used to restore posterior support and treat severely worn dentition, respectively. The treatment offered the patient a functional and esthetic result.

Matched MeSH terms: Mandible/surgery

Intubation without muscle relaxant: an alternative technique for rapid tracheal intubation

Wong AK, Teoh GS

Anaesth Intensive Care, 1996 Apr;24(2):224-30.

PMID: 9133197

The quality of laryngoscopy and tracheal intubation with propofol augmented by alfentanil was investigated as an alternative technique for rapid tracheal intubation. 119 patients aged between 18 and 60 years (ASA 1 and 2) undergoing elective surgery were prospectively studied in a randomized double-blind controlled fashion. Tracheal intubation facilitated by suxamethonium 1.0 mg/kg alfentanil 15 mu g/kg alfentanil 30 mu g/kg or saline control was compared after propofol induction. The quality of laryngoscopy and intubation were graded according to jaw relaxation, ease of insertion of the endotracheal tube and coughing on intubation. Failure to intubate occurred in 4% and 17% with alfentanil 15 mu g/kg and saline control respectively Tracheal intubation was successful in all patients with alfentanil 30 mu g/kg and suxamethonium 1.0 mg/kg. Alfentanil 15 mu g/kg was not statistically significantly different from saline (P = 0.112). Alfentanil 30 mu g/kg provided similar overall intubating conditions (P = 0.5) to suxamethonium 1.0 mg/kg. Alfentanil in both dosages effectively attenuated the haemodynamic responses to laryngoscopy and tracheal intubation.

Matched MeSH terms: Mandible/physiology

Florid cemento-osseous dysplasia in a young Chinese man. Case report

Ong ST, Siar CH

Aust Dent J, 1997 Dec;42(6):404-8.

PMID: 9470284

Florid cemento-osseous dysplasia refers to a group of fibro-osseous lesions which are exuberant, multiquadrant and arise from the tooth-bearing area of the jaws. It is classically described as a condition occurring almost exclusively in middle-aged black women. A case of florid cemento-osseous dysplasia occurring in a young Chinese male is reported which was rare in regard to race and sex. This 20 year old Chinese man presented with huge symmetrical bony lesions in all four quadrants of the jaws. Clinical presentation, radiological findings and histological features of the excised specimens are described. Treatment of the lesions was unusual. Curettage was first done with minimal benefit and it was followed by mandibular recontouring to improve facial appearance. The outcome of these procedures will be discussed.

Matched MeSH terms: Mandible/surgery

Association between occlusal force distribution in implant overdenture prostheses and residual ridge resorption

Khuder T, Yunus N, Sulaiman E, Ibrahim N, Khalid T, Masood M

J Oral Rehabil, 2017 May;44(5):398-404.

PMID: 28295492 DOI: 10.1111/joor.12504

This study aimed to investigate residual ridge resorption (RRR) of anterior and posterior maxillary and mandibular edentulous ridges, in patients treated with mandibular implant overdentures (IOD) and compare with conventional complete denture (CD) wearers, and to determine at each location, the association of RRR with the occlusal forces distribution and other patients' variables. The anterior and posterior RRR of IOD (six males, 17 females) and CD (12 males, 11 females) groups were determined using baseline and follow-up dental panaromic radiographs (DPT) (mean intervals 4 ± 1·8 years). The bone ratios were calculated using proportional area: anatomic to fixed reference areas and mean difference of ratios between the intervals determined RRR. The ridge locations included anterior and posterior maxillary and posterior mandibular arches. The T-Scan III digital occlusal system was used to record anterior and posterior percentage occlusal force (%OF) distributions. There were significant differences in anterior and posterior %OF between treatment groups. Two-way anova showed RRR was significant for arch locations (P = 0·005), treatment group (IOD versus CD) (P = 0·001), however, no significant interaction (P = 0·799). Multivariate regression analyses showed significant association between RRR and %OF at anterior maxilla (P = 0·000) and posterior mandible (P = 0·023) and for treatment groups at posterior maxilla (P = 0·033) and mandibular areas (P = 0·021). Resorption was observed in IOD compared to CD groups, with 8·5% chance of less resorption in former and 7·8% in the latter location. Depending on arch location, ridge resorption at various locations was associated with occlusal force distribution and/or treatment groups (implant prostheses or conventional complete dentures).

Matched MeSH terms: Mandible/pathology*

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