Systemic Diseases and Biological Dental Implant Complications: Comparison
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Please note this is a comparison between Version 2 by Jason Zhu and Version 1 by Christian Bacci.

The relationship between periodontitis and such systemic disorders as diabetes, cardiovascular disease and obesity has been extensively investigated. There is less scientific evidence available, however, regarding the influence of systemic diseases on the risk of late failure of dental implant rehabilitation due to peri-implantitis. Most of the literature concludes for no association between diabetes, cardiovascular disease, hypertension or osteoporosis and the risk of peri-implantitis. On the other hand, almost all the studies that investigated obesity as a risk factor for implant rehabilitation found a positive association between the two.

  • dental implants
  • mucositis
  • peri-implantitis

1. Introduction

According to the report from the World Workshop on the Classification of Periodontal and Peri-Implant Diseases and Conditions in 2017, peri-implantitis is a pathological condition due to plaque forming in the tissues around dental implants. It is characterized by inflammation of the mucosa and a subsequent gradual loss of the underlying bone [1]. Judging from a meta-analysis conducted by Lee et al., weighted mean implant-based and subject-based peri-implantitis prevalences were 9.25% and 19.83%, respectively. Weighted mean implant-based and subject-based peri-implant mucositis prevalences were 29.48% and 46.83%, respectively [2].
Taken together, cardiovascular and chronic respiratory diseases, cancer and diabetes are responsible for almost 75% of deaths in Europe as a whole, and the principal cause of death in the 53 member states of the WHO European Region. Nowadays, it is well known that preventing and controlling such systemic diseases is also fundamentally important to the health of the oral cavity. The link between systemic diseases and periodontitis has been amply discussed in the literature. It has been established, for instance, that diabetic patients can experience twice as much tooth loss as healthy individuals [3]. Such patients are therefore more likely to need prosthetic rehabilitation measures, which increasingly involve dental implants [4].
In terms of the inflammatory and lipid profile of healthy recipients of dental implants with and without a diagnosis of peri-implantitis, there is evidence to suggest that those suffering from peri-implantitis have a low-grade systemic inflammatory state (higher circulating levels of white blood cells) accompanied by dyslipidemia (increased blood levels of total cholesterol and LDL cholesterol) [5].
Long-term follow-up studies point to peri-implantitis and cardiovascular disease sharing the same risk factors, both being associated with high lipid levels in the blood. To date, the literature remains inconsistent and controversial concerning the association between cardiovascular disease and biological complications affecting implants [6]. Since inflammation is common to both these conditions, it is important to further investigate this potential association in better-controlled studies on more numerous, and more homogeneous sample populations.

2. Diabetes

The role of diabetes in the onset of complications affecting osseo-integrated dental implants has been investigated much more than that of the other systemic diseases considered here, but contrasting findings have emerged. No statistically significant differences came to light in most of the studies focusing exclusively on implant failure or survival [17,18,32,39,44,45,48][7][8][9][10][11][12][13]; and two of these studies [18,44][8][11] boasted a remarkably long follow-up (31 years in one, 9 in the other). On the other hand, three studies [33,35,40][14][15][16] did identify diabetes as a risk factor for implant failure. One was a retrospective study by French et al. [40][16], who examined 10,871 implants with a long-term follow-up (22 years). It is worth emphasizing that some studies assessed ‘implant failure’ without specifying the criteria used to define it, or whether failures occurred early or late. One of the main limitations of these studies probably lies in that they failed to consider issues such as bleeding and probing depth, which are essential to a diagnosis of peri-implant disease [83][17]. Of the studies that only examined peri-implant marginal bone loss in relation to diabetes, four [36,38,43,64][18][19][20][21] reported finding no statistically significant differences vis-à-vis non-diabetic patients, whereas the other four studies that considered this parameter [24,47,49,55][22][23][24][25] did find an association. When comparing diabetics with nondiabetics, it would be important to assess patients’ oral hygiene levels as well. For example, one limitation of the study by Al-Zahrani et al. [24][22] could lie in their having failed to conduct a logistic regression analysis on how many times a day patients brushed their teeth (nondiabetics: 29% once a day and 71% twice a day; diabetics 58% once a day and 42% twice a day). Abduljabbar et al. [55][25] also mentioned the importance of patients with chronic hyperglycemia monitoring their HbA1c levels in order to remain within a controlled range to prevent peri-implant damage. The primary outcome of a recent systematic review and meta-analysis [84][26] pointed to a statistically significant association between peri-implant marginal bone loss and diabetes mellitus. Out of six studies [34,54,57][27][28][29] examining the risk of peri-implantitis developing in diabetic patients, three [23,35,37][15][30][31] established a diagnosis of peri-implantitis based on different criteria from those adopted by the International Workshop of 2017. This is because they had been conducted earlier, but it is nonetheless a limitation. Another limitation of several studies [35,54][15][28] may concern the authors’ failure to measure patients’ blood sugar levels during the follow-up. Only one [54][28] of the above-mentioned six studies identified an association between diabetes and peri-implantitis. These results contrast with the findings of another recent review [85][32], which found that people suffering from diabetes mellitus had a twofold risk of developing peri-implant disease. An interesting finding emerged from a study by Al-Askar et al. [30][33], as follows: diabetic patients’ inflammatory cytokine levels were influenced by their glycemic status rather than by any peri-implantitis. Alshahrani et al. [31][34] and Al Zahrani et al. [26][35] also found osseointegration impaired, more severe peri-implantitis and more frequent implant failures in diabetic patients with poor glycemic control. The findings of the systematic review conducted by Naujokat et al. [14][36] were similar. Different results were reported in the studies conducted by Eskow and Oates et al. [20][37], and by Latimer et al. [22][38], who achieved high rates of dental implant success and survival in patients with diabetes Type II even when their glycemia was poorly controlled. The follow-up in these studies was rather short, however, being only one and two years, respectively. An important result emerging from a study by Alqahtani et al. [62][39] lies in that the authors identified a state of chronic hyperglycemia as a stronger mediator of inflammation than cigarette smoking in patients with diabetes mellitus Type II. The systematic literature review and meta-analysis conducted by Monje et al. [86][40] reported a similar finding, i.e., among non-smokers, those with hyperglycemia had a 3.39-fold risk of developing peri-implantitis compared with individuals with normal blood sugar levels. Three studies [25,51,63][41][42][43] found that immediately loaded dental implants were just as successful in diabetic patients as in healthy individuals, whereas another study [35][15] reported an association between immediate loading and a greater probing depth in diabetic patients. Recent systematic reviews and meta-analyses have likewise generated contrasting results [84,87][26][44] so it remains impossible to say for sure whether immediately-loaded dental implants are a safe option for diabetic patients. Two in every three of the studies considered here identified similar rates of implant failure and biological complications in individuals with and without diabetes. The remainder (one in three studies) concluded for diabetes being a risk factor for implant failure, marginal bone loss or biological complications. The literature on the topic is very heterogeneous, partly due to different definitions of peri-implantitis and the use of different clinical indicators of this condition. Most investigators also concentrated on implant failure rather than on peri-implantitis.

3. Obesity

OurThe literature search revealed only one study (out of a total of six) that found no association between BMI and dental implant failure or late complications [71][45]. The results reported in three studies [61,68,69][46][47][48] are echoed in a recent meta-analysis [89][49], which confirmed that bleeding on dental probing was significantly worse in obese patients than in normal-weight individuals. Another study [70][50] showed that obese patients were at greater risk of localized inflammation involving peri-implant hard, as well as soft, tissues. A study by Vohra et al. [67][51] identified a significant correlation between serum C-reactive protein (CRP) levels and bleeding on probing, as well as probing depth, in obese patients. This might explain why such patients have worse peri-implant clinical values, though long-term controlled clinical trials would be needed to support these findings (obtained in a retrospective cross-sectional study). Analyzing blood levels of inflammatory molecules could help to identify a possible causal relationship between obesity and peri-implantitis. In cases of obesity, the adipocytes secrete pro-inflammatory cytokines such as TNF-α and IL-6, which stimulate the liver’s production of CRP, altering the hosts’ immune response, and increasing their susceptibility to bacterial infections [11][52]. Although the above-mentioned studies were consistent in establishing obesity as a risk factor for peri-implantitis, the literature on the topic is still scarce. Hopefully, future research will shed more light on the role of obesity in dental implant rehabilitation.

4. Cardiovascular Disease

Out of 13 studies selected for review, 11 did not identify cardiovascular disease as a risk factor for dental implant failure or implant-related complications. Of the two studies that did, one was conducted by Krennmair et al. [21][53] on a sample of 37 patients: the Authors reported finding a greater bone loss in cases of mandibular full-arch restorations supported by four implants, albeit with a survival rate of 100%. In the other study, Neves et al. [37][31] found cardiovascular disease associated with a higher implant failure rate, but only hepatitis correlated with a higher risk of peri-implantitis. Their findings were consistent with those of a systematic review conducted by Turri et al. [90][54]. Given the paucity of research on the topic, it is still impossible to establish a clear link between cardiovascular disease and peri-implantitis. Since inflammation is a condition shared by both diseases, it is important to conduct further research on larger, better-controlled and more homogeneous samples of patients.

5. Hypertension

Only one study identified higher rates of implant failure in patients with hypertension [48][13], though the difference was only statistically significant for individuals who were also smokers. AbdulAzeez et al. [53][55] reported that, in the absence of an adequate monitoring of oral hygiene, systemic diseases had no impact on the severity of bleeding on probing or the probing depth. In fact, the healthy people in their sample revealed more severe inflammation in the oral cavity than patients suffering from diabetes or hypertension. This might be due to an anti-inflammatory effect of antihypertensive medication, which could improve PMN immune cell function [91][56]. The findings of our revieweviews are consistent with a meta-analysis conducted by Schimmel et al. [92][57], who concluded against hypertension negatively influencing dental implant survival.

6. Osteoporosis and the Use of Antiresorptive Drugs

Most of the studies examined here (n = 16) did not find lower success and survival rates for dental implants in patients with metabolic bone disease than in healthy patients. These results are consistent with the findings of a meta-analysis conducted by Dreyer et al., who found insufficient evidence to claim that osteoporosis is a risk factor for peri-implantitis [85][32]. As for the use of antiresorptive drugs, most of the studies reviewed did not identify them as risk factors for dental implant rehabilitation [41,46,73,74,75][58][59][60][61][62]. The only study that did find such an association [33][14], also reported 11 cases of implant failure caused by Medication-Related Osteonecrosis of the Jaw (MRONJ) due to sequestering occurring after the removal of an implant. Some studies identified osteoporosis (n = 3) and the use of antiresorptive drugs (n = 1) as risk factors for implant success and survival, and for marginal bone loss. One such study by Saminsky et al. [38][19] concerned just two patients with osteoporosis, who were fitted with a total of nine implants, so this is hardly a representative sample. In another study, Temmerman et al. [81][63] reported a statistically significant difference in the implant survival rate, but this was due to one patient with osteoporosis requesting the removal of five implants one year after loading—all implants in excellent health in terms of the peri-implant tissues. It is also important to mention that the study by Alsadi et al. [77][64] is practically identical to an article previously published by Toy and Uslu [79][65], as regards the materials and methods, and the results. It was consequently deemed a possible case of plagiarism, and therefore judged unreliable.

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