ABSTRACT
Objectives@#The stability of crestal bone has been reported as a major factor in the success of dental implants. Implants can be placed in an equicrestal (crestal) or subcrestal position. The aim of this study was to evaluate the effect of implant depth placement on marginal bone loss. @*Materials and Methods@#The study was created in a split-mouth design. Immediately after implant surgery, digital parallel radiographs were prepared and levels of bone were measured where marginal bone loss and bone level changes occurred. These measurements were repeated at 3-month and 6-month follow-up periods. @*Results@#In this interventional study, 49 implants were evaluated in 18 patients. Primary bone height was not significant between the intervention and control groups in both mesial and distal aspects at 3 months and 6 months from the baseline. The mean marginal bone loss on the mesial side was 1.03 mm in the subcrestal group and 0.83 mm in the crestal group. In addition, mean marginal bone loss on the distal side was 0.88 mm and 0.81 mm in the subcrestal and crestal groups, respectively. Marginal bone loss was not significantly different between sexes, the maxilla or mandible, and in the anterior or posterior regions as well as between different lengths and diameters of implants. @*Conclusion@#Based on the results of this study, there was no significant difference in terms of marginal bone loss between crestal and subcrestal implants.
ABSTRACT
OBJECTIVES@#Bone density seems to be an important factor affecting implant stability. The relationship between bone density and primary and secondary stability remains under debate. The aim of this study was to compare primary and secondary stability measured by resonance frequency analysis (RFA) between different bone types and to compare implant stability at different time points during 3 months of follow-up.@*MATERIALS AND METHODS@#Our study included 65 implants (BioHorizons Implant Systems) with 3.8 or 4.6 mm diameter and 9 or 10.5 mm length in 59 patients. Bone quality was assessed by Lekholm-Zarb classification. After implant insertion, stability was measured by an Osstell device using RFA at three follow-up visits (immediately, 1 month, and 3 months after implant insertion). ANOVA test was used to compare primary and secondary stability between different bone types and between the three time points for each density type.@*RESULTS@#There were 9 patients in type I, 18 patients in type II, 20 patients in type III, and 12 patients in type IV. Three implants failed, 1 in type I and 2 in type IV. Stability values decreased in the first month but increased during the following two months in all bone types. Statistical analysis showed no significant difference between RFA values of different bone types at each follow-up or between stability values of each bone type at different time points.@*CONCLUSION@#According to our results, implant stability was not affected by bone density. It is difficult to reach a certain conclusion about the effect of bone density on implant stability as stability is affected by numerous factors.
ABSTRACT
OBJECTIVES: Bone density seems to be an important factor affecting implant stability. The relationship between bone density and primary and secondary stability remains under debate. The aim of this study was to compare primary and secondary stability measured by resonance frequency analysis (RFA) between different bone types and to compare implant stability at different time points during 3 months of follow-up. MATERIALS AND METHODS: Our study included 65 implants (BioHorizons Implant Systems) with 3.8 or 4.6 mm diameter and 9 or 10.5 mm length in 59 patients. Bone quality was assessed by Lekholm-Zarb classification. After implant insertion, stability was measured by an Osstell device using RFA at three follow-up visits (immediately, 1 month, and 3 months after implant insertion). ANOVA test was used to compare primary and secondary stability between different bone types and between the three time points for each density type. RESULTS: There were 9 patients in type I, 18 patients in type II, 20 patients in type III, and 12 patients in type IV. Three implants failed, 1 in type I and 2 in type IV. Stability values decreased in the first month but increased during the following two months in all bone types. Statistical analysis showed no significant difference between RFA values of different bone types at each follow-up or between stability values of each bone type at different time points. CONCLUSION: According to our results, implant stability was not affected by bone density. It is difficult to reach a certain conclusion about the effect of bone density on implant stability as stability is affected by numerous factors.
Subject(s)
Humans , Bone Density , Classification , Dental Implants , Follow-Up StudiesABSTRACT
Objectives: the aim of this study was to assess the efficacy of aloe vera and green tea mouthwash for reducing pain after periodontal pocket reduction surgery
Methods: this randomized, split-mouth, double-blind, cross-over clinical trial was carried out on 45 patients between 25 and 50 years of age requiring pocket reduction surgery. Patients underwent bilateral surgeries in two sessions. After the first surgery, the patients were randomized to receive either mouthwash or placebo for 10 days; then, each group used the other product for the same time period. The parameters assessed following each procedure were the numeric pain rating scale [NPRS] and number of painkillers taken by patients to alleviate postoperative pain. Also, patients were requested to report side effects, if any, after using the mouthwash
Results: the reported postoperative pain score was significantly lower after using the aloe vera and green tea mouthwash compared to the placebo only in the first postoperative day [P=0.002]. Furthermore, number of analgesic tablets used in the first postoperative day was significantly lower than that in the control group [P=0.007]
Conclusion: our results indicated that patients experienced significantly less early postoperative pain when they used aloe vera and green tea mouthwash. Thus, its application can be recommended to decrease pain after periodontal pocket reduction surgery
ABSTRACT
Magnets were first used for over denture retention in 1977. The use of implant retained over denture with magnets offers a simple treatment approach to the problem of instability of the conventional complete denture. Advantage with magnets include technical simplicity and reduced lateral stresses on the abutments. The purpose of this study was to evaluate the effect of function, thermal changes and time duration on Dyna magnetic force in artificial mouth model. In this longitudinal in vitro study, we used eight Dyna system magnets [2.5 [asterisk] 500]. One magnet was used control and the others were placed in artificial mouth affected by different forces functional and thermal changes ranging from 5 to 55[degree sign]c throughout ten years. The force of repulsion had been measured after 3, 5, 10 years and decreased respectively 11.9%, 19.1%, 22.5%, as compared to baseline, however clinically this reduction was not significant in terms of denture retention. During the study period the magnets lost some of their repulsion force, In addition, their steel coatings were not damaged over time. However, viewing the results of this study, it could be concluded that repetitive function and variable mouth temperature are effective factors in reducing magnet retention in an over denture attachment in the long term