Mandibular Implant-Retained Overdentures: Potential Accelerator of Bone Loss in the Anterior Maxilla?

PURPOSE: To compare the residual ridge resorption (RRR) of the anterior maxillary bone beneath complete dentures when opposed by mandibular complete dentures (CD) and implant-retained overdentures (IRO). MATERIALS AND METHODS: 18 patients were rehabilitated with maxillary CD opposing mandibular IRO, and 4 patients were prescribed with conventional CD. Cone beam computed tomography (CBCT) scans of the maxilla were acquired before and 1 year post-treatment and converted into 3D models using Mimics research software. RRR was quantified by measuring the changes in bone volume following superimpositioning and sectioning of these models at the anterior maxillary region. Subsequently, the sectioned 3D models of the anterior maxilla were exported to 3-Matic software to reveal the predominant region and depth of RRR. RESULTS: The mean reduction in bone volume of the anterior maxilla in the CD group was 2.60% (SD = 1.71%, range = -4.89 % to -0.92%, median = -2.30%), while the mean reduction in the IRO group was almost three times higher at 7.25% (SD = 3.16%, range = -13.25 to -1.50, median = -7.15%). The predominant areas of RRR were on the buccal and occlusal ridge of the anterior maxilla. CONCLUSION: Within the limits of this study, it may be concluded that an IRO caused significantly higher RRR of the anterior maxilla than a CD.

Porous NiTi Dental Implant Fabricated by a Metal Injection Molding: An in Vivo Biocompatibility Evaluation in an Animal Model.

This study assessed the corrosion resistance, intracutaneous reactivity, acute systemic toxicity, and in situ tissue effect of the implantation of porous NiTi fabricated by metal injection molding in animal models. For the intracutaneous reactivity study, five intracutaneous injections were administered per site with and without the tested extract in polar and nonpolar solutions. The extract was also delivered via intravenous and intraperitoneal routes for acute systemic toxicity. TiAl6 V4 (control) and porous NiTi were implanted in rabbit femora for a period of 13 weeks to evaluate the in situ tissue response. Corrosion was evaluated through open and cyclic polarization in PBS, while biocompatibility was investigated by assessing the general conditions, skin irritation score (edema and erythema), and histopathology. No active dissolution or hysteresis loop was observed in the corrosion study. None of the animals exhibited death, moribundity, impending death, severe pain, self-mutilation, or overgrooming. No edema was observed at injection sites. Only the positive control showed an erythematous reaction at 24, 48, and 72 h observations (p < 0.001). Porous NiTi showed a low in situ biological response for inflammation, neovascularization, and fibrosis in comparison to the control implant (p = 0.247, 0.005, and 0.011, respectively). Porous NiTi also demonstrated high pitting corrosion resistance while causing no acute hypersensitivity or acute systemic toxicity. The study concludes that porous NiTi implants were unlikely to cause local sensitization, acute systemic toxicity, or chronic inflammatory reactions in an animal model. Porous NiTi also exhibited osseointegration equivalent to Ti6AI4 V of known biocompatibility.

Self-preference music for gagging patient: Effect on physiology and oral health-related quality of life during dental impression.

BACKGROUND: Gagging condition is among factors contributing to avoidance behavior to seek the dental treatment, and rigorous management is still under investigation. This study aims to explore the effect of listening to the self-preference music in reducing the gagging condition during dental impression procedure towards gagging patient. Physiology and psychological impact to the procedure with and without musical intervention are investigated. METHOD AND MATERIAL: A group of twenty-five patients that will undergo impression procedure was randomly selected. Self-reported Gagging Problem Assessment (GPA-pa-SF) questionnaires was then administered to determine the severity of gagging. Maxillary impression was taken twice within the same patient in two different time intervals (1st without any intervention and 2nd with musical intervention). During both procedures, the pulse rate/minutes (BPM) and arterial oxygen saturation of haemoglobin (SpO2%) were recorded and psychometric assessment was evaluated through the Oral Health Impact Profile (OHIP-14). RESULT: Mean value of BPM was significantly reduced with music (p < 0.05) while SpO2 was considerably has positive effect although was found no significant. The OHIP 14 demonstrated that functional limitation and psychological disability were the most affected before the intervention. Overall, musical stimuli had a significant effect on stress reduction in both physiological (p < 0.05) and psychological (p < 0.05) outcomes except for social disability and handicap items. CONCLUSION: Listening to self-preference music during impression taking had improved physiology and psychology of gagging patients thus, can be attributed to the better dental management.